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高温处理后高强度混凝土(HSC)的力学性能研究*
周晖1,李静2,史增录2,谷任国3
摘 要

(1 广州城建职业学院建筑工程学院, 广州 510925; 2 乌海职业技术学院建筑工程系, 乌海 016000; 3 华南理工大学土木与交通学院, 广州 510641)

[摘要]模拟火灾情况下高强混凝土(HSC)经过高温处理后的力学性能,有利于分析和改善HSC的使用性能。基于混凝土损伤理论,建立高温处理后混凝土动态损伤的计算公式。对25个HSC棱柱体试件进行不同高温加热处理,并对高温处理后的试件,利用电液伺服压力试验机进行不同应变率下的轴向动态受压试验。试验结果表明,200℃以下的HSC棱柱体外观正常,400~800℃之间的HSC棱柱体开始出现裂缝,并随温度的升高裂缝不断增多,温度越高,裂缝的宽度越大,20℃时HSC棱柱体的损伤平均值为0-287,温度越高,损伤平均值越小,800℃的HSC棱柱体的损伤平均值相比20℃的减小47-4%,温度对HSC的损伤影响较大,温度越高,HSC的损伤越大。

[关键词]高强混凝土; 动态受压试验; 应变率; 损伤

中图分类号:TU528, TU375文献标识码:A文章编号:1002-848X(2017)09-0055-04

 

Study on mechanical properties of high-strength concrete subjected to high temperature treatment

Zhou Hui1, Li Jing2, Shi Zenglu2, Gu Renguo3

(1 School of Civil Engineering and Architecture, Guangzhou City Construction College, Guangzhou 510925, China; 2 Department of Architectural Engineering, Wuhai Vocational & Technical College, Wuhai 016000, China; 3 College of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China)

Abstract:It is beneficial to analyze and improve the service performance of high-strength concrete (HSC) to study the mechanical properties of HSC subjected to high temperature treatment under simulated fire. Based on damage theory of concrete, calculation formula of dynamic damage of concrete after high temperature was proposed. Heating treatments on 25 HSC prism specimens were conducted under different high temperatures, and axial dynamic compression tests were conducted on high temperature treated specimens with the use of electro-hydraulic servo pressure testing machine under different strain rates. The test results show that the appearance of HSC prism below 200℃ is normal, and the cracks on HSC prism begin to appear and increase at temperature between 400℃ and 800℃ with increasing temperature. The higher the temperature is, the larger the width of the crack is. The average damage value of HSC at 20℃ is 0-287. The higher the temperature is, the smaller the average damage is. The average damage value of HSC at 800℃ is 47.4% smaller than that at 20℃. The temperature has a great influence on the damage of HSC, and the higher the damage is, the greater the damage of HSC is.

Keywords:high-strength concrete (HSC); dynamic compression test; strain rate; damage

 

*广东省高等学校优秀青年教师培养计划项目(Yq201462),广东省品牌专业建设项目(2016gzpp016),亚热带建筑科学国家重点实验室自主研究课题(2017KB16)。

 

作者简介:周晖,博士,副教授,Email:acl433@163.com。

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