The replacement of traditional aggregates with recycled rubber in concrete is increasingly attractive,driven by sustainability-related considerations.Nevertheless,incorporating rubber particles alters both the microin...The replacement of traditional aggregates with recycled rubber in concrete is increasingly attractive,driven by sustainability-related considerations.Nevertheless,incorporating rubber particles alters both the microinterfacial characteristics and the macroscopic performance of concrete,which leads to the variation in bond behavior between rebar and rubberized concrete.Against this background,42 central pull-out specimens were prepared for bond tests,and the impact of the rubber replacement ratio(ρrv)on the bond behavior was investigated.Moreover,specimens with different confined conditions were designed to identify a reliable strengthening scheme for crumb rubber concrete(CRC)members.The test results show that whenρrv increases from 0%to 30%,the crack width of the splitting specimens decreases,but the bond strength deteriorates simultaneously.Whenρrv increases to 40%,the specimens are subjected to pull-out failure,and the deterioration of the bond strength can be alleviated.Specimens strengthened by fiber-reinforced polymer(FRP)and/or stirrups undergo pull-out failure and exhibit higher bond strength than that of their unstrengthened counterparts.Confinement enhances the bond strength of CRC specimens,beyond which further confinement induces no additional gains.By calibrating rubber-influenced parameters and the confinement critical effect,a mechanics-based model is established for predicting the bond strength of the CRC-rebar interface.Finally,the stochasticity of the bond-slip response is simulated based on the assumption of multi-composite spring-friction units fracturing stochastically,and a continuous bond-slip model with high accuracy and an integral absolute error(EIA)below 10.47%is proposed.展开更多
在地方经济蓬勃发展与医药行业深刻变革的宏观背景下,培育高素质的临床试验协调员(Clinical Research Coordinator,简称CRC),已成为顺应社会需求、推进健康中国建设的关键举措。本文以四川护理职业学院针对药学专业开展的临床试验项目...在地方经济蓬勃发展与医药行业深刻变革的宏观背景下,培育高素质的临床试验协调员(Clinical Research Coordinator,简称CRC),已成为顺应社会需求、推进健康中国建设的关键举措。本文以四川护理职业学院针对药学专业开展的临床试验项目化教学试点为切入点,深入剖析其构建的创新医教协同培养模式,从人才培养实践、培养的关键问题与应对策略及培养成效等方面进行介绍。此培养模式在实践中取得了积极的成效,显著提升了学生的就业竞争力,为其他地区在CRC人才培养方面提供了极具价值的参考范例,助力行业整体人才培养水平的提升。展开更多
基金supported by the Zhejiang Provincial Natural Science Foundation of China(No.LTGG 23 E 080008).
摘要The replacement of traditional aggregates with recycled rubber in concrete is increasingly attractive,driven by sustainability-related considerations.Nevertheless,incorporating rubber particles alters both the microinterfacial characteristics and the macroscopic performance of concrete,which leads to the variation in bond behavior between rebar and rubberized concrete.Against this background,42 central pull-out specimens were prepared for bond tests,and the impact of the rubber replacement ratio(ρrv)on the bond behavior was investigated.Moreover,specimens with different confined conditions were designed to identify a reliable strengthening scheme for crumb rubber concrete(CRC)members.The test results show that whenρrv increases from 0%to 30%,the crack width of the splitting specimens decreases,but the bond strength deteriorates simultaneously.Whenρrv increases to 40%,the specimens are subjected to pull-out failure,and the deterioration of the bond strength can be alleviated.Specimens strengthened by fiber-reinforced polymer(FRP)and/or stirrups undergo pull-out failure and exhibit higher bond strength than that of their unstrengthened counterparts.Confinement enhances the bond strength of CRC specimens,beyond which further confinement induces no additional gains.By calibrating rubber-influenced parameters and the confinement critical effect,a mechanics-based model is established for predicting the bond strength of the CRC-rebar interface.Finally,the stochasticity of the bond-slip response is simulated based on the assumption of multi-composite spring-friction units fracturing stochastically,and a continuous bond-slip model with high accuracy and an integral absolute error(EIA)below 10.47%is proposed.
摘要在地方经济蓬勃发展与医药行业深刻变革的宏观背景下,培育高素质的临床试验协调员(Clinical Research Coordinator,简称CRC),已成为顺应社会需求、推进健康中国建设的关键举措。本文以四川护理职业学院针对药学专业开展的临床试验项目化教学试点为切入点,深入剖析其构建的创新医教协同培养模式,从人才培养实践、培养的关键问题与应对策略及培养成效等方面进行介绍。此培养模式在实践中取得了积极的成效,显著提升了学生的就业竞争力,为其他地区在CRC人才培养方面提供了极具价值的参考范例,助力行业整体人才培养水平的提升。