高性能混凝土热工性能及耐高温性能试验研究  

Experimental study on thermal performance and high temperature resistance performance of high performance concrete

作　　者：王维红 景何仿 李新睿[1] 丛佩瑶 韩静云 高峰 王辉 WANG Weihong;JING Hefang;LI Xinrui;CONG Peiyao;HAN Jingyun;GAO Feng;WANG Hui(School of Civil Engineering,North Minzu University,Yinchuan 750021,China;Research Institute of Numerical Computation and Engineering Applications,North Minzu University,Yinchuan 750021,China)

机构地区：[1]北方民族大学土木工程学院,宁夏银川750021 [2]北方民族大学数值计算与工程应用研究所,宁夏银川750021

出　　处：《混凝土》2021年第9期94-97,共4页Concrete

基　　金：宁夏高等学校科学技术研究项目(NGY2018-158);国家自然科学基金项目(11861003);宁夏自然科学基金项目(2021AAC03208);北方民族大学校级一般科研项目(2019XYZTM05);宁夏自治区科学技术研究重点研发计划项目(2019BEG03048);北方民族大学高层次引进人才启动基金项目。

摘　　要：通过混凝土热工性能及耐高温性能试验,研究水胶比及不同比例稻壳灰(RHA)、粉煤灰(FA)、硅灰(SA)矿物掺和料对混凝土热工性能及耐高温性能的影响。结果表明:导热系数随水胶比的增大而降低;矿物掺料可降低混凝土的导热系数并改善混凝土的耐高温性能,复掺10%RHA与15%FA混凝土导热系数最小。随着温度的升高,复掺及三掺稻壳灰/粉煤灰/硅灰混凝土强度不断劣化,在温度800℃时,普通混凝土抗压强度仅为18.2 MPa,而掺矿物掺合料组混凝土最大的抗压强度为36.1 MPa。Thermal performance and high temperature resistance performance of concrete were investigated.The effects of water binder ratio and different proportions of rice husk ash,fly ash and silica fume mineral admixture on the thermal conductivity and high temperature resistance performance of concrete were studied.The results show that thermal conductivity of concrete decreases with the increment of water binder ratio.Mineral admixture can reduce the thermal conductivity of concrete and improve the high temperature resistance of concrete.The thermal conductivity of concrete mixed with 10%RHA and 15%FA is minimum.The compressive strength of concrete mixed powder of RHA/FA,RHA/SA,FA/SA and RHA/FA/SA were deteriorated with the rising temperature.At 800℃,the compressive strength of normal concrete is only 18.2 MPa,while the compressive strength of concrete mixed with mineral admixture is up to 36.1 MPa.

关 键 词：混凝土 导热系数 高温 矿物掺合料 

分 类 号：TU528.34[建筑科学—建筑技术科学]