再生骨料混凝土徐变特性基础试验

发布时间：2018-01-05 08:26

本文关键词：再生骨料混凝土徐变特性基础试验　出处：《东南大学学报(自然科学版)》2014年03期 　论文类型：期刊论文

【摘要】：以水灰比为参数对水泥浆的力学性能和徐变特性进行了基础试验.结果表明,水泥浆的弹性模量和抗压强度均随水灰比的增加而降低,外界环境(温度和湿度)对水泥浆的徐变影响不大.在此试验基础上,通过研究水灰比和水泥浆徐变函数(单位应力作用下弹性变形与徐变应变之和)之间的关系,建立了水泥浆和砂浆徐变函数的预测模型.对配合比为m(水泥)∶m(水)∶m(细骨料)=0.5∶1∶1.49的砂浆徐变预测结果和试验结果的对比分析表明,砂浆徐变函数预测模型可以较好地预测砂浆的徐变发展过程.模型再生混凝土的徐变试验证明,老砂浆的存在是再生混凝土徐变增加最重要的一个原因.
[Abstract]:The mechanical properties and creep properties of cement slurry were tested with water-cement ratio as parameters. The results showed that the elastic modulus and compressive strength of cement slurry decreased with the increase of water-cement ratio. The outside environment (temperature and humidity) has little effect on the creep of cement slurry. The relationship between water-cement ratio and cement slurry creep function (the sum of elastic deformation and creep strain under unit stress) was studied. A prediction model of creep function of cement slurry and mortar is established. The comparison and analysis of creep prediction results and test results of 0.5: 1: 1.49 mortar show that. The prediction model of mortar creep function can well predict the creep development of mortar. The creep test of model recycled concrete proves that the existence of old mortar is the most important reason for creep increase of recycled concrete.
【作者单位】：同济大学土木工程学院;河南理工大学土木工程学院;
【基金】：国家自然科学基金资助项目(51178340,51325802)
【分类号】：TU528
【正文快照】： 一般认为混凝土中骨料在外荷载作用下只发生弹性变形,混凝土的徐变主要是由水泥浆的徐变引起的,骨料对水泥浆的徐变具有约束作用,不同骨料对水泥浆徐变的约束主要由它的弹性模量决定[1].再生混凝土中,由于再生粗骨料中附着老砂浆,使其徐变问题变得更加复杂.一方面,老砂浆使再

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