摘要
为研究再生骨料混凝土在单轴受压情况下的本构关系,以某道路废弃混凝土作为再生骨料,制作了45个尺寸为150 mm×150 mm×300 mm的棱柱体试件,研究再生骨料混凝土在不同取代率、不同水灰比下的单轴受压应力-应变关系,建立了再生骨料混凝土的本构关系。结果表明:随着再生骨料取代率的增加,再生骨料混凝土的峰值应力fc整体呈先减小、后小幅度增大再减小的变化趋势;峰值应变ε0整体呈先增大、后减小的变化趋势;随着水灰比的增加,峰值应力fc由于取代率的不同而呈现不同的变化趋势,但总体上呈下降趋势;峰值应变ε0基本均呈先增大、然后基本不变或略微减小的趋势。总体而言,再生骨料混凝土的峰值应力略小于天然混凝土,再生骨料混凝土的应变略大于天然混凝土。研究成果可为再生骨料混凝土的推广应用提供技术支持和参考。
The constitutive relation of recycled aggregate concrete was constructed based upon the stress-strain relation under uniaxial compression with varying replacement ratio of recycled aggregate and water-cement ratio.With road waste concrete as recycled aggregate,45 prismatic specimens with dimensions of 150 mm×150 mm×300 mm were prepared for test.Results unveiled that with the increase of the replacement ratio of recycled aggregate,the peak stress fc of recycled aggregate concrete declined at first,and then climbed slightly but decreased afterwards;peak strainε0 augmented firstly and then decreased.With the increase of water-cement ratio,peak stress fc presented different variation trends—yet in general a decline trend—due to varied replacement ratio;peak strainε0 increased firstly and then remained unchanged or decreased slightly.In general,the peak stress of recycled aggregate concrete is slightly smaller than that of natural concrete,and strain slightly greater than that of natural concrete.The research results offer technical support and reference for the popularization and application of recycled aggregate concrete.
作者
韩玉舟
安旭文
肖倍
黄天翔
郭子卿
HAN Yu-zhou;AN Xu-wen;XIAO Bei;HUANG Tian-xiang;GUO Zi-qing(School of Civil Engineering, Wuhan University, Wuhan 430072, China)
出处
《长江科学院院报》
CSCD
北大核心
2020年第7期135-139,146,共6页
Journal of Changjiang River Scientific Research Institute
关键词
再生骨料混凝土
取代率
水灰比
单轴受压
本构关系
recycled aggregate concrete
replacement rate
water-cement ratio
uniaxial compression
constitutive relation
