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Enhancing the performance of waste-derived super-sulfated with carbonated recycled concrete fines for cemented paste backfill applications 认领 引用
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作者 Liancheng Wang Xingtong Yue +4 位作者 Ping Jiang Xiaobo Liu Shiyu Zhang Kai Cui Yingliang Zhao 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第2期492-506,共15页
This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The finding... This study investigates the performance enhancement of super-sulfated cement(SSC)derived from arsenic-containing bio-oxidation waste(BW)through the incorporation of carbonated recycled concrete fines(CRCF).The findings revealed that the addition of 5wt%CRCF yields optimal performance,with compressive strengths reaching approximately 1.83,12.59,and 42.81 MPa at 1,3,and 28 d,respectively.These values represented significant increases of 408.3%,10.0%,and 14.3%compared to the reference sample.The improvement was attributed to the synergistic effects of ultrafine CRCF particles acting as fillers and nucleation sites,as well as the high reactivity of silica gels,which promoted the formation of additional hydration gels.Microstructural analysis confirmed that CRCF addition refined pore structure,and enhanced the stiffness of C-S-H gels.Furthermore,CRCF served as a net CO2 sink,sequestering 0.268 kg CO2 per kilogram of CRCF and thereby reducing the carbon footprint of SSC.In addition,the feasibility of applying CRCF-modified SSC in cemented paste backfill(CPB)is highlighted,given the high cement-related carbon footprint of conventional CPB.When 5wt%CRCFmodified SSC was employed in CPB,its 3-d compressive strength attained over 70%of that of ordinary Portland cement(OPC),while the 28-d strength was comparable to that of OPC.The proposed binder thus provides a sustainable pathway for BW valorization,combining waste utilization,carbon sequestration,and improved engineering performance. 展开更多
关键词 super-sulfated cement compressive strength bio-oxidation waste arsenic cemented paste backfill
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Improving the interfacial strength of cement-polyacrylate grout and Ordovician limestone by graphene oxide 认领 引用
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作者 Zhiyang Wang Yingwei Li +3 位作者 Longji Wu He Chen Xiuliang Yin Zhijun Wu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第1期702-712,共11页
In coal mining on a high-pressure Ordovician limestone aquifer,grouting materials should have sufficient mechanical properties,particularly strong interfacial bonding performance to address stress concentration at the... In coal mining on a high-pressure Ordovician limestone aquifer,grouting materials should have sufficient mechanical properties,particularly strong interfacial bonding performance to address stress concentration at the grout-limestone interface induced by rock stress disturbances during mining.In this study,graphene oxide(GO)was integrated into cement-polyacrylate composite grout to improve its interfacial bonding.First,four-point bending tests were conducted,and the Monte Carlo method combined with the simplex search algorithm was employed to determine the variations in shear cohesion and static friction parameters.The results reveal that GO can significantly increase both the tensile and shear cohesion of the grout-limestone interface,but minimally affects the interfacial friction coefficient.Second,nuclear magnetic resonance(NMR)and scanning electron microscopy(SEM)tests were performed.The results indicate that GO nanosheets result in a squamaceous microstructure of the grout consolidation mass,increasing the adhesion of the grout-limestone interface.Moreover,spiny Aft(ettringite)clusters can be induced in limestone fracture surfaces by GO,which could serve as anchors for limestone and grout consolidation mass. 展开更多
关键词 Graphene oxide Cement-polyacrylate grout Grout-limestone interfacial strength Spiny cement hydration product crystals Micro anchoring
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Effect of Particle Fineness of Magnesium Oxide on Properties of Magnesium Oxychloride Cement 认领 引用
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作者 LI Baolan ZHENG Weixin LI Yihuang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期483-490,共8页
The influence mechanism of MgO particle fineness on the properties of MOC was comprehensively explored through means of grinding,sieving,hydration and apparent density testing,in conjunction with characterization meth... The influence mechanism of MgO particle fineness on the properties of MOC was comprehensively explored through means of grinding,sieving,hydration and apparent density testing,in conjunction with characterization methods such as setting time,stability,compressive strength,and microscopic morphology.The findings reveal that MOC demonstrates excellent stability and mechanical properties when the particle fineness of MgO is less than 75μm.When the MgO particle fineness exceeds 75μm,MOC exhibits superior fluidity and maneuverability.When 0.75μm MgO is employed as the raw material to prepare MOC,a water-cement ratio of 0.6 proves more favorable.These results can furnish a theoretical foundation for the preparation and application of MOC. 展开更多
关键词 MgO particle fineness magnesium oxychloride cement heat treatment microstructure water-cement ratio
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Cemented vs uncemented femoral fixation in total hip arthroplasty:A systematic review and meta-analysis of periprosthetic fracture risk 认领 引用 被引量：1
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作者 Mohammed H Abushal Osama M Embaby +2 位作者 Mahmoud Mersal Emran Badghish Mohamed Elalfy 《World Journal of Orthopedics》 2026年第2期132-142,共11页
BACKGROUND Periprosthetic femoral fractures(PFFs)represent a devastating complication following primary total hip arthroplasty(THA),associated with significant morbidity,mortality,and healthcare costs.The choice of fe... BACKGROUND Periprosthetic femoral fractures(PFFs)represent a devastating complication following primary total hip arthroplasty(THA),associated with significant morbidity,mortality,and healthcare costs.The choice of femoral fixation method-cemented vs uncemented-may influence the risk of postoperative periprosthetic fracture.While uncemented stems have gained popularity due to perceived advantages in younger patients and bone preservation,emerging evidence suggests potential differences in fracture risk between fixation methods,particularly in elderly and osteoporotic populations.AIM To conduct a systematic review and meta-analysis comparing the risk of PFFs between cemented and uncemented femoral fixation in primary THA.METHODS Following the PRISMA 2020 guidelines,we performed a comprehensive search of PubMed,EMBASE,and the Cochrane Library databases up to October 2025.We included comparative studies reporting periprosthetic fracture rates following primary THA with cemented vs uncemented femoral fixation.The primary out-come was the incidence of PFFs.Data were pooled using a random-effects model.Risk of bias was assessed using the Cochrane RoB 2.0 tool for randomized controlled trials and the Methodological Index for Non-Randomized Studies for observational studies.Publication bias was evaluated using funnel plot analysis and Egger’s test.RESULTS A total of 27 studies were included in the qualitative synthesis,of which three comparative studies,encompassing 2650 patients(772 cemented,1878 uncemented),provided extractable data for quantitative meta-analysis of periprosthetic fracture incidence.The pooled analysis demonstrated a trend towards a lower risk of periprosthetic fractures in the cemented group compared to the uncemented group(risk ratio=0.46;95%confidence interval:0.14-1.49;P=0.19);however,this finding was not statistically significant.Substantial heterogeneity was observed among the included studies(I2=93.1%,P<0.001).Funnel plot analysis was limited by the small number of studies but did not suggest significant publication bias.CONCLUSION This meta-analysis suggests that cemented femoral fixation in primary THA may be associated with a lower risk of PFFs compared to uncemented fixation,although this finding did not reach statistical significance and was based on limited,heterogeneous data.The choice of fixation method should be individualized based on patient age,bone quality,activity level,and surgeon experience.Cemented fixation may be particularly advantageous in elderly patients and those with poor bone stock.Further high-quality randomized controlled trials with adequate followup are needed to provide definitive evidence. 展开更多
关键词 Periprosthetic femoral fracture Total hip arthroplasty Primary total hip arthroplasty Cemented fixation Uncemented fixation Meta-analysis Fracture prevention
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Precise and non-destructive approach for identifying the real concentration based on cured cemented paste backfill using hyperspectral imaging 认领 引用 被引量：2
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作者 Qing Na Qiusong Chen Aixiang Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第1期116-128,共13页
Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly diffic... Cemented paste backfill(CPB)is a technology that achieves safe mining by filling the goaf with waste rocks,tailings,and other materials.It is an inevitable choice to deal with the development of deep and highly difficult mines and meet the requirements of environmental protection and safety regulations.It promotes the development of a circular economy in mines through the development of lowgrade resources and the resource utilization of waste,and extends the service life of mines.The mass concentration of solid content(abbreviated as“concentration”)is a critical parameter for CPB.However,discrepancies often arise between the on-site measurements and the pre-designed values due to factors such as groundwater inflow and segregation within the goaf,which cannot be evaluated after the solidification of CPB.This paper innovatively provides an in-situ non-destructive approach to identify the real concentration of CPB after curing for certain days using hyperspectral imaging(HSI)technology.Initially,the spectral variation patterns under different concentration conditions were investigated through hyperspectral scanning experiments on CPB samples.The results demonstrate that as the CPB concentration increases from 61wt%to 73wt%,the overall spectral reflectance gradually increases,with two distinct absorption peaks observed at 1407 and 1917 nm.Notably,the reflectance at 1407 nm exhibited a strong linear relationship with the concentration.Subsequently,the K-nearest neighbors(KNN)and support vector machine(SVM)algorithms were employed to classify and identify different concentrations.The study revealed that,with the KNN algorithm,the highest accuracy was achieved when K(number of nearest neighbors)was 1,although this resulted in overfitting.When K=3,the model displayed the optimal balance between accuracy and stability,with an accuracy of 95.03%.In the SVM algorithm,the highest accuracy of 98.24%was attained with parameters C(regularization parameter)=200 and Gamma(kernel coefficient)=10.A comparative analysis of precision,accuracy,and recall further highlighted that the SVM provided superior stability and precision for identifying CPB concentration.Thus,HSI technology offers an effective solution for the in-situ,non-destructive monitoring of CPB concentration,presenting a promising approach for optimizing and controlling CPB characteristic parameters. 展开更多
关键词 cemented paste backfill concentration hyperspectral imaging non-destructive testing
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Multi-scale quantitative study on cemented tailings and waste-rock backfill under different loading rates 认领 引用 被引量：1
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作者 YIN Sheng-hua CHEN Jun-wei +4 位作者 YAN Ze-peng ZENG Jia-lu ZHOU Yun YANG Jian ZHANG Fu-shun 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期357-374,共18页
The development of metallic mineral resources generates a significant amount of solid waste,such as tailings and waste rock.Cemented tailings and waste-rock backfill(CTWB)is an effective method for managing and dispos... The development of metallic mineral resources generates a significant amount of solid waste,such as tailings and waste rock.Cemented tailings and waste-rock backfill(CTWB)is an effective method for managing and disposing of this mining waste.This study employs a macro-meso-micro testing method to investigate the effects of the waste rock grading index(WGI)and loading rate(LR)on the uniaxial compressive strength(UCS),pore structure,and micromorphology of CTWB materials.Pore structures were analyzed using scanning electron microscopy(SEM)and mercury intrusion porosimetry(MIP).The particles(pores)and cracks analysis system(PCAS)software was used to quantitatively characterize the multi-scale micropores in the SEM images.The key findings indicate that the macroscopic results(UCS)of CTWB materials correspond to the microscopic results(pore structure and micromorphology).Changes in porosity largely depend on the conditions of waste rock grading index and loading rate.The inclusion of waste rock initially increases and then decreases the UCS,while porosity first decreases and then increases,with a critical waste rock grading index of 0.6.As the loading rate increases,UCS initially rises and then falls,while porosity gradually increases.Based on MIP and SEM results,at waste rock grading index 0.6,the most probable pore diameters,total pore area(TPA),pore number(PN),maximum pore area(MPA),and area probability distribution index(APDI)are minimized,while average pore form factor(APF)and fractal dimension of pore porosity distribution(FDPD)are maximized,indicating the most compact pore structure.At a loading rate of 12.0 mm/min,the most probable pore diameters,TPA,PN,MPA,APF,and APDI reach their maximum values,while FDPD reaches its minimum value.Finally,the mechanism of CTWB materials during compression is analyzed,based on the quantitative results of UCS and porosity.The research findings play a crucial role in ensuring the successful application of CTWB materials in deep metal mines. 展开更多
关键词 cemented backfill waste rock loading rate multi-scale analysis mercury intrusion porosimetry pore structure micromorphology
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Influence of aggregate particle size on fracture behavior and energy evolution of cemented rockfill in the post-peak stage 认领 引用 被引量：1
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作者 Zhu Li Weibing Zhu +4 位作者 Qingdong Qu Jialin Xu Guorui Feng Chunlei Guo Jingmin Xu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期667-685,共19页
Cemented rockfill(CRF)combines structural support with sustainable reuse of coal-derived solid waste.This study integrates digital image correlation,acoustic emission monitoring,and finite-discrete element simulations... Cemented rockfill(CRF)combines structural support with sustainable reuse of coal-derived solid waste.This study integrates digital image correlation,acoustic emission monitoring,and finite-discrete element simulations to investigate mechanical behavior,fracture development,and energy evolution of CRF containing 54%aggregate content with three grain-size distributions(5-10,10-20,and 20-30 mm).Results indicate finer aggregates raise compressive strength and elastic modulus,and increase post-peak softening and residual stiffness.Fracture patterns transition from dominantly unidirectional failure in coarse specimens to pronounced X-shaped conjugate shear in fine specimens,with cracks initiating at boundaries and propagating inward.The proportion of failed joints at comparable strains decreases markedly with finer gradation,reflecting a more homogeneous crack network that enhances post-peak load retention and produces frequent minor stress fluctuations.Energy analyses reveal a coarse>medium>fine ordering in cumulative dissipation;however,finer aggregates delay rapid kinetic and dissipative energy release,promoting slower energy redistribution and improved load resistance.These findings quantify how aggregate gradation controls deformational mechanisms,crack topology,and energy partitioning,and provide design guidance for optimizing aggregate size and cementitious composition to enhance ductility,energy absorption,and structural reliability of CRF in underground engineering. 展开更多
关键词 Cemented rockfill(CRF) Aggregate particle size Post-peak bearing characteristics Crack propagation Energy evolution
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Cement-Based Thermoelectric Materials, Devices and Applications 认领 引用 被引量：1
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作者 Wanqiang Li Chunyu Du +1 位作者 Lirong Liang Guangming Chen 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第1期750-781,共32页
Cement stands as a dominant contributor to global energy consumption and carbon emissions in the construction industry.With the upgrading of infrastructure and the improvement of building standards,traditional cement ... Cement stands as a dominant contributor to global energy consumption and carbon emissions in the construction industry.With the upgrading of infrastructure and the improvement of building standards,traditional cement fails to reconcile ecological responsibility with advanced functional performance.By incorporating tailored fillers into cement matrices,the resulting composites achieve enhanced thermoelectric(TE)conversion capabilities.These materials can harness solar radiation from building envelopes and recover waste heat from indoor thermal gradients,facilitating bidirectional energy conversion.This review offers a comprehensive and timely overview of cementbased thermoelectric materials(CTEMs),integrating material design,device fabrication,and diverse applications into a holistic perspective.It summarizes recent advancements in TE performance enhancement,encompassing fillers optimization and matrices innovation.Additionally,the review consolidates fabrication strategies and performance evaluations of cement-based thermoelectric devices(CTEDs),providing detailed discussions on their roles in monitoring and protection,energy harvesting,and smart building.We also address sustainability,durability,and lifecycle considerations of CTEMs,which are essential for real-world deployment.Finally,we outline future research directions in materials design,device engineering,and scalable manufacturing to foster the practical application of CTEMs in sustainable and intelligent infrastructure. 展开更多
关键词 Functional cement Thermoelectric materials Device structure Smart building
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Study on the destabilizing damage precursors of cemented tailings backfill based on critical slowing down theory combined with multiple denoising algorithms under consideration of initial defect conditions 认领 引用 被引量：1
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作者 ZHAO Kang ZHONG Jun-cheng +3 位作者 YAN Ya-jing LIU Yang WEN Dao-tan XIAO Wei-ling 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第1期375-399,共25页
The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the... The cemented tailings backfill(CTB)with initial defects is more prone to destabilization damage under the influence of various unfavorable factors during the mining process.In order to investigate its influence on the stability of underground mining engineering,this paper simulates the generation of different degrees of initial defects inside the CTB by adding different contents of air-entraining agent(AEA),investigates the acoustic emission RA/AF eigenvalues of CTB with different contents of AEA under uniaxial compression,and adopts various denoising algorithms(e.g.,moving average smoothing,median filtering,and outlier detection)to improve the accuracy of the data.The variance and autocorrelation coefficients of RA/AF parameters were analyzed in conjunction with the critical slowing down(CSD)theory.The results show that the acoustic emission RA/AF values can be used to characterize the progressive damage evolution of CTB.The denoising algorithm processed the AE signals to reduce the effects of extraneous noise and anomalous spikes.Changes in the variance curves provide clear precursor information,while abrupt changes in the autocorrelation coefficient can be used as an auxiliary localization warning signal.The phenomenon of dramatic increase in the variance and autocorrelation coefficient curves during the compression-tightening stage,which is influenced by the initial defects,can lead to false warnings.As the initial defects of the CTB increase,its instability precursor time and instability time are prolonged,the peak stress decreases,and the time difference between the CTB and the instability damage is smaller.The results provide a new method for real-time monitoring and early warning of CTB instability damage. 展开更多
关键词 initial defects cemented tailings backfill critical slowing down acoustic emission RA/AF values denoising algorithms
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Influence of bedding and prefabricated fissure angles on cement-bonded sand 3 D-printed Brazilian discs:Experimental investigations and PFC modelling 认领 引用 被引量：1
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作者 SUN Yi-qing XIA Shi-fa +3 位作者 HUANG Wei YANG Wei-cai GAN Lei ZHANG Wen-bing 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第3期1371-1386,共16页
Bedding structures significantly influence rock mass deformation and failure,challenging engineering stability.This study aimed to investigate the fracture mechanisms of layered rock masses by examining the effects of... Bedding structures significantly influence rock mass deformation and failure,challenging engineering stability.This study aimed to investigate the fracture mechanisms of layered rock masses by examining the effects of bedding and prefabricated fissure inclination angles on the mechanical behavior of layered Brazilian disc specimens.Layered rock-like Brazilian disc specimens were prepared by combining sand 3 D printing technology with cement slurry as a bonding agent,enabling precise control of bedding features.Uniaxial compression tests,with a loading rate of 0.3 mm/min,coupled with digital image correlation(DIC)technology,were conducted to capture load−displacement curves and crack propagation processes,with two schemes designed to explore varying prefabricated fissure inclination angles(α)and bedding inclination angles(β).Additionally,the discrete element method(DEM)using particle flow code(PFC)with parallel bond(PB)and smooth-joint(SJ)models was employed for numerical simulation,with mesoscopic parameters calibrated against experimental data.The results showed that both α and β significantly affected crack propagation and failure modes:Increasing α led to a gradual increase in peak strength,with cracks initiating from fissure tips and propagating toward loading points;Increasing β caused the failure mode to transition from vertical splitting to bedding-controlled fracture,with peak strength first decreasing,and then increasing.PFC simulations effectively reproduced experimental load−displacement curves and crack morphologies,confirming numerical reliability.This study demonstrates that sand 3 D printing with cement bonding is viable for fabricating layered rock-like specimens,and the combined experimental and numerical results provide insights into layered rock fracture mechanisms,offering references for understanding bedding and prefabricated fissure influences on rock mechanical behavior. 展开更多
关键词 bedded rock masses sand 3 D printing cement slurry bonding Brazilian disc test PFC discrete element simulation
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Advances in Cement Bond Logging Technology and Issues in Cement Job Quality Evaluation 认领 引用
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作者 Fei Li Lixia Zhu 《Journal of Electronic Research and Application》 2026年第4期223-227,共5页
The Cement Bond Log(CBL)is currently the primary method used in domestic oilfields to evaluate cement job quality.However,its interpretation results are prone to ambiguity,leading to misjudgment and erroneous conclusi... The Cement Bond Log(CBL)is currently the primary method used in domestic oilfields to evaluate cement job quality.However,its interpretation results are prone to ambiguity,leading to misjudgment and erroneous conclusions.This results in artificially high reported pass rates for cement jobs,which hinders the development of cementing technology.This paper systematically analyzes the limitations of CBL in evaluating cement job quality,discusses in detail ten influencing factors including tool eccentricity,fast formations,micro-annulus,cement sheath thickness,gas-cut drilling fluid,casing parameters,localized channeling,cement slurry properties,logging timing,and acoustic frequency.It also points out inherent shortcomings of CBL in evaluating the second interface,identifying thin beds,locating channels,and providing quantitative interpretation.Research indicates that the consistency rate of CBL in reflecting actual cement job quality is only about 33%.In contrast,the Sector Bond Tool(SBT)offers technical advantages through multi-parameter visual display and cement sheath imaging.It is recommended that SBT be used as a means for detailed evaluation of cement job quality in key or problematic wells. 展开更多
关键词 Cement bond logging Cement Bond Log(CBL) Cement job quality evaluation Influencing factors Sector Bond Tool(SBT)
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Effects of ultrasonic treatment on wet mineralization of cement powder 认领 引用
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作者 Yongsheng CHEN Fengping YU +2 位作者 Yanbiao ZHU Hedong LI Tao WANG 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2026年第5期534-548,I0049-I0054,共15页
In this study,an ultrasonic-assisted wet mineralization process is developed using ordinary Portland cement as the raw material.This approach is designed to advance the use of mineralization technologies in constructi... In this study,an ultrasonic-assisted wet mineralization process is developed using ordinary Portland cement as the raw material.This approach is designed to advance the use of mineralization technologies in construction materials by simultaneously enhancing mechanical properties and mineralization efficiency.A comprehensive microstructural analysis is conducted to elucidate the underlying mineralization mechanisms facilitated by ultrasonic treatment.Furthermore,an industrial-scale implementation framework is developed to support the practical application of this technique.We find that the pH variation during the process follows three distinct stages:a rapid drop,a plateau,and a gradual decline.During the same wet mineralization period,the content of calcium silicate hydrate(C-S-H)in the ultrasonic-assisted cement suspension is increased by 16.02%.Ultrasonic-assisted treatment improves the degree of mineralization and suppresses the growth of large crystals.Moreover,the incorporation of wet mineralization-treated suspensions into cement pastes significantly increases the compressive strength of the cementitious system.The most notable enhancement is observed when ultrasonic-assisted wet mineralization is conducted for 15 min,which results in a 25.78%increase in 1-d compressive strength and a 12.20%improvement in 28-d compressive strength.A 25-min ultrasonic-assisted treatment gives the greatest reduction in setting time,shortening the initial setting time by 19.46%and the final setting time by 12.98%.Based on a calculated ultrasonic mineralization energy efficiency factor,we determine that the ultrasonic-assisted wet mineralization process achieves its highest efficiency within the first 5 min.Prolonged mineralization results in a noticeable decline in mineralization efficiency. 展开更多
关键词 Wet mineralization Ultrasonic action Cement-based material Cement suspension
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Consolidation and mechanical response of cemented tailings backfill to multiaxial stresses from rockwall closure and self-loading 认领 引用 被引量：1
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作者 Hongbin Liu Mamadou Fall 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3407-3424,共18页
Cemented paste backfill(CPB)is a key material in underground mining,providing essential ground support while aiding in tailings management.However,current research has overlooked the combined effects of horizontal roc... Cemented paste backfill(CPB)is a key material in underground mining,providing essential ground support while aiding in tailings management.However,current research has overlooked the combined effects of horizontal rockwall closure stress and vertical self-loading stress,referred to as multiaxial stress,on the CPB's consolidation behavior and its mechanical properties development.Understanding and assessing these effects is critical because they directly affect the stability and performance of CPB structures.In this study,a novel multiaxial compressive stress curing and monitoring apparatus was used to simulate two horizontal rockwall closure scenarios with a consistent backfilling rate,under both drained and undrained conditions.Key parameters assessed included unconfined compressive strength(UCS),deformation during curing,stress-strain behavior,and modulus of elasticity.The results highlight that rockwall closure,combined with vertical stress,plays a pivotal role in the consolidation behavior of CPB,significantly affecting key mechanical properties.Higher horizontal stress from faster rockwall closure intensified compression during curing,leading to reduced porosity,enhanced particle rearrangement,and accelerated consolidation.This intensified consolidation leads to notable improvements in mechanical properties,including increased UCS,enhanced stiffness,and a higher modulus of elasticity,indicating improved load-bearing capacity.Moreover,the interaction between multiaxial stress and drainage conditions influenced stress-strain behavior and deformation,with drained conditions promoting earlier plasticity and higher peak stresses.These findings underscore the critical influence of multiaxial stress,combined with drainage conditions,on CPB performance,offering valuable insights for optimizing CPB design in underground mining applications. 展开更多
关键词 Consolidation behaviour Cemented paste backfill(CPB) Tailings Multiaxial stresses curing Mine Rockwall closure
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Low-carbon self-compacting glass fiber-reinforced concrete using calcium sulpho-aluminate cement and recycled concrete fine aggregate 认领 引用
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作者 Radhika SRIDHAR Yanfei CHE +3 位作者 Patraphorn PHORNTHEPKASEMSANT Thanongsak IMJAI Elhem GHORBEL Kypros PILAKOUTAS 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第4期845-868,共24页
This study presents the development and comprehensive evaluation of low-carbon self-compacting glass fiber-reinforced concrete(GRC)utilizing calcium sulpho-aluminate(CSA)cement and recycled concrete fine aggregate(RFA... This study presents the development and comprehensive evaluation of low-carbon self-compacting glass fiber-reinforced concrete(GRC)utilizing calcium sulpho-aluminate(CSA)cement and recycled concrete fine aggregate(RFA),targeting enhanced sustainability and durability for high-performance infrastructure applications.Through rigorous mix design optimization,the research demonstrates that substituting natural sand with RFA in CSA cementbased matrices yields a compressive strength of up to 55 MPa after 28 d,comparable to or exceeding conventional mixes,while increasing elastic modulus by approximately 15%,resulting in a stiffer,denser composite.Flexural performance tests revealed that CSA and RFA with GRC achieves a modulus of elasticity of 17 GPa and a modulus of rupture(MOR)of 3.77 kN,coupled with substantial toughness and ductility,particularly under loads.After 75 d of accelerated aging,RFA–GRC retained 50%to 70%of its initial MOR and 20%to 40%of strain to failure,outperforming traditional GRC by about 30%,confirming its superior long-term durability.Environmental analysis verifies a dramatic reduction in carbon footprint of CSA RFA GRC achieves up to 74%less CO2 emissions and 48%lower embodied energy than ordinary Portland cement controls,with values as low as 275 kg CO2/m3 and 675 MJ/m3.Practical validation through prototype drainage channels and permanent formwork further underscores the material’s viability,demonstrating excellent workability,structural integrity,and crack resistance.Furthermore,the test results establish CSA and RFA with GRC as a highly sustainable,resilient alternative,supporting circular construction and long-life design in aggressive environments. 展开更多
关键词 low-carbon concrete self-compacting concrete glass fiber reinforced calcium sulpho-aluminate cement recycled fine aggregates durability enhancement
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Experimental study of early strength and hydraulic conductivity of cemented soils improved with soda residue and bentonite:Promoting solid waste recycling 认领 引用
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作者 Pengju GAO Xia WEI +2 位作者 Jianwen DING Sai ZHANG Chenhao LI 《ENGINEERING Structure and Civil Engineering》 SCIE EI CAS CSCD 2026年第6期1271-1282,共12页
The insufficient early strength and hydraulic conductivity of cemented soil can significantly impact the quality of deep cement mixing(DCM)walls,particularly in water-rich sandy silt regions.To enhance the early engin... The insufficient early strength and hydraulic conductivity of cemented soil can significantly impact the quality of deep cement mixing(DCM)walls,particularly in water-rich sandy silt regions.To enhance the early engineering performance of DCM walls,industrial by-products(IBPs)such as soda residue(SR),and other additives such as bentonite and water glass(WG)were used.Unconfined compression strength(UCS)and hydraulic conductivity tests were conducted to assess the strength and hydraulic conductivity of the improved cemented soil.Microstructural and mineralogical tests were performed to reveal the mechanisms of SR,bentonite,and WG.The results indicate that adding SR introduces sulfate and chloride ions into the reaction system,thereby promoting the formation of hydration products.However,when the SR content exceeds 8%,it leads to the precipitation of calcium carbonate,resulting in the formation of calcium hydroxide(CH)crystals,which reduces the 7 d UCS by 15.4%compared to 8%SR.The addition of bentonite increases the silica and aluminum content,promoting the formation of calcium silicate hydrate(C-S-H)and calcium aluminosilicate hydrate(C-A-S-H),while also filling the soil pores,reducing the early hydraulic conductivity of the cemented soil by 1.5 orders of magnitude(from 9.87×10−6to 5.28×10−7cm/s at 7 d with 7%bentonite).The addition of WG significantly enhances the early strength of the cemented soil,with an average increase of 12.5%(from 52.5%–60.0%to 62.5%–75.0%)in the 7 d strength performance ratio(n=qu7d/qu28d).This study contributes to improving the early engineering performance of DCM walls from economic and environmental perspectives,promoting the sustainable utilization of IBPs. 展开更多
关键词 cemented soil SR bentonite WG strength and hydraulic conductivity
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The Carbonation Trap:Time Delays and Performance Uncertainty in Cement Climate Accounting 认领 引用
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作者 Haoxuan Yu Jilong Pan +2 位作者 Izni Zahidi Chow Ming Fai Dongfang Liang 《Engineering》 SCIE EI CSCD 2026年第4期32-41,共10页
Cement production accounts for 5%-8%of global CO2emissions,prompting industry interest in carbonation—the natural reabsorption of atmospheric CO2by concrete—as a climate mitigation strategy.Recent studies sugg... Cement production accounts for 5%-8%of global CO2emissions,prompting industry interest in carbonation—the natural reabsorption of atmospheric CO2by concrete—as a climate mitigation strategy.Recent studies suggest carbonation could offset approximately 50%of process emissions,positioning concrete infrastructure as vast carbon reservoirs.However,systematic analysis reveals fundamental limitations challenging this assumption.Cement production generates concentrated CO2pulses during manufacturing while carbonation proceeds slowly through diffusion-limited processes spanning decades,creating critical temporal asymmetry.When properly accounted for through time-adjusted climate assessments,this mismatch reduces claimed benefits by 30%-60%compared to conventional global warming potential calculations.Moreover,synthesis of published experimental data across 99 scenarios demonstrates that 52%exhibit less than 50%probability of achieving net emission reductions,with compressive strength penalties often requiring additional binder use that erodes nominal carbon gains.Critically,this perspective exposes three systematic failures in current climate accounting:①temporal frameworks treating decades-delayed absorption as equivalent to immediate emission avoidance,②selective reporting obscuring widespread performance failures,and③policy prioritization allocating resources to slow,uncertain processes while proven alternatives remain underutilized.By integrating sector-scale projections,lifecycle timing analyses,and comprehensive performance distributions under consistent boundaries,this cross-study synthesis reveals patterns invisible when research remains fragmented—establishing evidence-based hierarchies for near-term decarbonization.In contrast,proven alternatives demonstrate superior performance:supplementary cementitious materials offer 11%-34%emission reductions through direct clinker substitution,structural design optimization achieves 18.5%reductions without compromising safety,and service life extension strategies enable 75%total reduction potential by 2100—far exceeding carbonation-dependent pathways.Consequently,while carbonation remains chemically viable,its slow kinetics,performance uncertainty,and temporal misalignment with climate targets necessitate policy recalibration prioritizing transparent temporal accounting and proven alternatives over uncertain future absorption processes. 展开更多
关键词 Cement carbonation Carbon accounting Climate policy Emission reduction Carbon capture
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CT investigation on oilwell cement deterioration caused by H2S along a leaking channel under high temperature:Insights for geothermal applications 认领 引用
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作者 Yue Yin Li-Wei Zhang +4 位作者 Kai-Yuan Mei Xiao-Wei Cheng Man-Guang Gan Yan Wang Chun-Mei Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第4期2235-2247,共13页
The alteration of oilwell cement due to H2S poses a significant threat to wellbore structural integrity in geothermal environments.However,laboratory studies on the cement deterioration process caused by H2S flo... The alteration of oilwell cement due to H2S poses a significant threat to wellbore structural integrity in geothermal environments.However,laboratory studies on the cement deterioration process caused by H2S flow along a leaking channel under high-temperature conditions remain scarce.In this study,computed tomography(CT)scanning was utilized to assess the morphological changes and alteration patterns of oilwell cement caused by H2S flow in multiple dimensions.Additionally,scanning electron microscopy(SEM)coupled with energy-dispersive X-ray spectroscopy(EDS)and Fourier transform infrared spectroscopy(FTIR)were applied to elucidate the microscale mechanisms responsible for the H2S-driven alteration.The results show that:H2S flow along the cement channel results in increased cement matrix porosity and formation of large pores,which are especially evident in regions adjacent to the channel.Chemical etching and secondary crystal growth contribute to the expansion of channel dimension and roughening of the channel wall.Consequently,the permeability of the cement matrix exhibited a marked increase of 45%over a period of 14 days.At the microstructural level,compared to unaltered oilwell cement,which exhibits a homogeneous texture and fine particle composition,exposure to H2S leads to the formation of a heterogeneous and fractured structure within the cement.As a result of sulfidation reactions,a surface layer approximately 1 mm in thickness forms on the cement,which is depleted in calcium and enriched in silicon.The identification of metallic sulfides elucidated the chemical mechanisms responsible for the deterioration of cement properties.In summary,the flow of H2S through the channel within the cement causes significant alteration of the cement structure compared to other alteration modes. 展开更多
关键词 H₂S Oilwell cement High temperature Computed tomography scanning Flow-reaction coupling
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NIR-Responsive Nano-Integrated Magnesium Phosphate Cement Promotes Bone Regeneration via Osteoblast-Exosome-Osteoclast Crosstalk 认领 引用
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作者 Bin Wang Shun-Jie Wu +6 位作者 Xin-Lin Lu Yong Ge Yue Zhang Zhi-Xiang Ma Bin Xu Paul-K.Chu Yan-Bin Zhao 《Rare Metals》 SCIE EI CAS CSCD 2026年第2期759-777,共19页
The limited osteogenic capacity of magnesium phosphate cement(MPC)has constrained its biomedical applications,underscoring the necessity to develop MPC with enhanced physical properties and bone-forming capabilities.I... The limited osteogenic capacity of magnesium phosphate cement(MPC)has constrained its biomedical applications,underscoring the necessity to develop MPC with enhanced physical properties and bone-forming capabilities.In this study,a multifunctional MPC system was developed by incorporating zoledronic acid-loaded near-infrared(NIR)-responsive nanocarriers,strontium oxide(SrO),and hyaluronic acid(HA).The nanocarriers were constructed using dual-layer poly-dopamine(PDA)modification of mesoporous silica nanoparticles(MSNs),enabling controlled drug release and antibacterial efficacy under NIR stimulation.The optimized Sr-ZMP-HA MPC demonstrated prolonged setting time,near-neutral pH,superior injectability,and improved compressive strength.Immersion tests revealed its sustained degradation resistance.This composite material exhibited excellent biocompatibility along with enhanced osteogenic and angiogenic properties,particularly when activated by NIR irradiation.The experiments demonstrated that NIR-triggered Sr-ZMP-HA MPC promoted osteoblast-derived exosome secretion.These exosomes mediated miRNA transfer to osteoclasts,effectively suppressing their proliferation and differentiation while delaying bone tissue senescence.This dual-functional system,combining NIR-responsive nanomedicine with exosome-mediated intercellular communication,provided a novel strategy for developing advanced bone repair materials,potentially addressing current limitations in orthopedic applications through synergistic mechanical reinforcement and biological activation mechanisms. 展开更多
关键词 exosomes magnesium phosphate cement mesoporous silica nanoparticles osteogenesis
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Comparative Evaluation of Chemical and Physical Expansive Agents in Cemented Paste Backfill:Expansion Behavior,Mechanical Response,and Microstructural Mechanisms 认领 引用
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作者 Lijie Guo Mengyuan Li +3 位作者 Xiaoming Wei Andrew Pan Xiaopeng Peng Tingting Ren 《Rare Metals》 SCIE EI CAS CSCD 2026年第4期928-939,共12页
This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavio... This study presents an assessment of four representative expansive additives—calcium sulphoaluminate-calcium oxide,magnesium oxide,sodium lauryl sulfate,and sodium abietate—and their effects on the expansion behavior,mechanical development,and microstructural characteristics of cemented paste backfill(CPB).A series of backfill mixtures containing different expansive agent types and dosages were prepared to examine their volumetric response during mixing and early hydration,uniaxial compressive strength(UCS)evolution at various curing ages,and corresponding microstructural features.The results reveal that the two physical foaming agents generated substantial instantaneous expansion during mixing,with sodium lauryl sulfate and sodium abietate reaching total relative expansion ratios of 24.38%and 10.73%at 3 days,respectively.In contrast,magnesium oxide and expansive cement produced delayed but stable expansion associated with hydration reactions.Strength testing showed strong type-dependent behavior:mixtures containing magnesium oxide or sodium abietate consistently achieved higher UCS values across all curing ages,whereas those with sodium lauryl sulfate or expansive cement exhibited significant strength reduction.Microstructural analysis further demonstrated that sodium abietate promoted a dense and continuous hydration network without the formation of interconnected pores,whereas expansive cement produced a dispersed and more porous matrix.Integrating the expansion,strength,and microstructural results shows that sodium abietate offers the most favorable balance between controlled expansion and mechanical performance,making it a promising additive for improving roof-contact efficiency and long-term structural stability in underground backfilling.The findings provide scientific support for the rational selection and optimized application of expansive agents in CPB. 展开更多
关键词 backfill-roof contacting cemented paste backfill expansive additives tailings underground mining
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Efficient stabilization of dredged sediment by combining nano-modification and low-carbon supersulfated cement 认领 引用
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作者 Lei Lang Dongxing Wang +2 位作者 Bing Chen Desheng Li Linlin Gu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期4034-4049,共16页
Supersulfated cement(SSC)is considered an environmentally friendly alternative to ordinary Portland cement(OPC),while its stabilization efficiency on dredged sediment(DS)is still unclear.Three types of SSC were prepar... Supersulfated cement(SSC)is considered an environmentally friendly alternative to ordinary Portland cement(OPC),while its stabilization efficiency on dredged sediment(DS)is still unclear.Three types of SSC were prepared by combining ground granulated blast-furnace slag,alkali-activator NaOH,and a sulfate waste source,yielding SSCE(from electrolytic manganese residue),SSCP(from phosphogypsum),and SSCD(from desulfurization gypsum).To further enhance the stabilization efficiency of SSC on DS,nano-SiO₂(NS)and nano-Al₂O₃(NA)were incorporated individually and as a composite blend.Mechanical properties and microstructural analyses were conducted to evaluate the stabilization efficiency and elucidate the underlying mechanisms.The leaching toxicity of SSCE-stabilized DS was investigated via leaching tests.The results showed that both alkali-activation and nano-modification can significantly improve the strength development of SSC-stabilized DS.At least 15%NaOH was required for SSC to achieve the same stabilization efficiency as OPC.The optimum NA-modified SSCD-stabilized DS demonstrated superior strength compared to OPC-stabilized DS.Composite NS/NA-modification was more efficient than using NS or NA individually.For DS stabilized with SSCE,SSCP,and SSCD,the optimal NS-to-NA mass ratios were 7:3,3:7,and 3:7,respectively.Notably,the nano-modified SSCE-stabilized DS showed no environmental risks.Incorporating NS and NA into SSC-stabilized DS respectively promoted the formation of C-S-H gel and ettringite.A micro-mechanism model was developed to explain the strength evolution of nano-modified SSC-stabilized DS.This study provides a theoretical basis for the application of SSC in DS stabilization,and facilitates the collaborative resource utilization of industrial solid wastes and DS. 展开更多
关键词 Nano-modification Supersulfated cement Dredged sediment stabilization Strength development Micro-mechanism
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