建筑结构学报2017，Vol.38Issue(12)：105-113,9.DOI:10.14006/j.jzjgxb.2017.12.012
高温后再生混凝土力学性能研究
Research on mechanical behavior of recycled aggregate concrete after high temperatures
摘要
Abstract
Based on the parameters which were temperature,recycled coarse aggregate replacement percentage,coarse aggregate type and concrete strength,168 standard prism specimens of recycled aggregate concrete were exposed to different high temperatures,and then subjected to axial compression test.The surface variation and compression failure mode of specimens after exposure to high temperature were observed in the experiment.The mass loss ratio,elasticmodel,axial compressive strength and stress-strain curve were obtained and analyzed through the effect of each parameter variation.Two methods of residual strength assessment,which is based on the mass loss ratio and the highest exposure temperature,for recycled aggregate concrete after elevated temperature were proposed.The test results show that with the increase of temperature,the color of specimens change from steel gray to brown gray,finally to gray.Crack and spalling due to elevated temperature appear on its surface.The mass loss ratio is increased with the increase of temperature,enhancement of replacement percentage and reduction of compressive strength.The influence of temperature for failure mode and mechanical behavior of recycled aggregate concrete after high temperature is most significant.The higher the temperature,the wider the crack band,and the higher of the damage level.With the increase of temperature,the decrease of elasticity modulus is greater than that of peak stress.The influence of high temperature on mechanical behavior of recycled gravel aggregate concrete is more significant than that of recycled pebble aggregate concrete.The change of concrete strength and recycled coarse aggregate replacement percentage has no obvious effect on mechanical behavior of recycled aggregate concrete after high temperature.The method of residual strength assessment is accurate.The calculated axial compressive strength of recycled aggregate concrete after high temperature based on the test agrees well with the measured results.关键词
再生混凝土/高温作用后/静力试验/力学性能/强度评估Key words
recycled aggregate concrete/after high temperature/static test/mechanical behavior/strength assessment分类
建筑与水利引用本文复制引用
陈宗平,周春恒,李伊,陈建佳,吴波..高温后再生混凝土力学性能研究[J].建筑结构学报,2017,38(12):105-113,9.基金项目
国家自然科学基金项目(51578163),广西自然科学基金重点项目(2016GXNSFDA380032),广西高等学校高水平创新团队及卓越学者计划项目(桂教人[2017]38号). （51578163）
