长龄期再生混凝土弹性模量及泊松比试验研究  

Experimental study of elastic modulus and Poisson's ratios of long age recycled aggregate concrete

作　　者：徐金俊[1] 陈宗平[1] 余兴国[2] 陈宇良[1] 叶培欢[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西电力工业勘察设计研究院,广西南宁530023

出　　处：《混凝土》2012年第1期15-17,23,共4页Concrete

基　　金：国家自然科学基金项目(50908057);广西理工科学试验中心重点项目(LGZX201102);广西大学大学生创新性试验计划项目(201010)

摘　　要：为了揭示与时间效应相关的再生混凝土本构特性,制作了33个再生混凝土棱柱体试件进行单轴抗压试验,重点考察了经历两年静置的再生混凝土试件弹性模量及泊松比的变化规律,并提出了相关建议公式。结果表明:随着骨料取代率提高,再生混凝土的脆性性质较为显著;由于时间控制起了很大的作用,再生混凝土的轴心抗压强度和弹性模量较之普通混凝土及标准龄期计算值有较大提高;泊松比的变化不明显,其值相对稳定,且在高取代率时其泊松比数值比普通混凝土有所降低。In order to reveal the constitutive behavior of recycled aggregate concrete（RAC） which is related to time effect,33 prismatic specimens were designed to have uniaxial compression tests.The changing variation of elastic modulus and Poisson＇s ratios of recycled aggregate concrete specimens which were placed two years in the lab were inspected,and a related correction formula was put forward to describe the elastic modulus.The results show that with the aggregate replacement rate growing,the RAC brittleness was relatively obvious.Due to the time effect played a large role in them,the axial compressive strength and elastic modulus were more larger then those of normal concrete and the standard age concrete which is calculated.Poisson＇s ratios did not change significantly and their values were relatively stable,while the higher replacement rate,the lower values.

关 键 词：时间效应 再生混凝土 弹性模量 泊松比 轴心抗压强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]