摘要
在常温和高温条件下,对C20,C30,C50机制砂混凝土进行试验研究,分析混凝土在不同温度和不同冷却方法下的残余强度。研究结果表明,当温度≤300℃时,高温后混凝土残余强度降幅<30%,较非人工机制砂混凝土降幅大;当温度达300℃,随着加热时间的延长,混凝土残余强度基本保持不变或缓慢回升;当温度持续升高且>500℃后,混凝土残余强度开始大幅下降;加热温度达700℃或500℃加热120min后,各强度等级混凝土不同冷却方式下的残余强度变化规律趋于一致。
Under normal temperature and high temperature conditions,experimental research is conducted on C20,C30 and C50 machine-made sand concrete to analyze the residual strength of concrete at different temperatures and different cooling methods. The results show that when the temperature is less than or equal to 300℃,the residual strength decrease amplitude of concrete after high temperature is less than 30%,which is larger than that of non-manufactured sand concrete. When the temperature reaches300℃,the residual strength of the concrete remains basically unchanged or slowly rises with the extension of the heating time.When the temperature continues to rise,after more than 500℃,the residual strength of the concrete begins to decrease significantly.After heating at 700℃ or 500℃ for 120 min,the residual strength of each strength grade concrete under different cooling methods tends to be consistent.
作者
潘佩瑶
陶泽鹏
卢云祥
陈丽
曾义
李东旭
潘正斌
PAN Peiyao;TAO Zepeng;LU Yunxiang;CHEN Li;ZENG Yi;LI Dongxu;PAN Zhengbin(Guizhou Construction Science Research and Design Institute Co.,Ltd.of CSCEC,Guiyang,Guizhou 550006,China;Guiyang Construction Engineering Quality Supervision Station,Guiyang,Guizhou 550002,China)
出处
《施工技术》
CAS
2020年第3期67-69,共3页
Construction Technology
基金
国家重点研发计划:城镇建筑结构运维安全保障关键技术(2017YFC0806100)
中建四局课题:基于中建幸福城项目的BIM智能建造与智慧运营研究应用(CSCEC4B-2018-KT-44)
中建四局课题:建筑信息模型(BIM)技术在装配式建筑施工过程中的应用与研究(CSCEC4B-2018-KT-45)
关键词
机制砂混凝土
力学性能
残余强度
试验
研究
machine-made sand concrete
mechanical properties
residual strength
testing
research
