高温后聚丙烯纤维混凝土热工参数试验研究  

Experimental study on thermal parameters of polypropylene fiber reinforced concrete after elevated temperature

作　　者：姚秀鹏 韩阳[1] 沈雷[2] 朱德 曹茂森 YAO Xiu-peng;HAN Yang;SHEN Lei;ZHU De;CAO Mao-sen(School of Civil Engineering,Henan University of Technology,Henan Zhengzhou 450001,China;College of Mechanics and Materials,Hohai University,Jiangsu Nanjing 210098,China)

机构地区：[1]河南工业大学土木工程学院,河南郑州450001 [2]河海大学力学与材料学院,江苏南京210098

出　　处：《消防科学与技术》2020年第7期900-903,共4页Fire Science and Technology

基　　金：国家自然科学基金项目(50678060,51908195)。

摘　　要：采用瞬态热源法对高温处理后不同纤维掺量和纤维长度的聚丙烯纤维混凝土PFRC的热工性能开展试验研究。结果表明:高温后PFRC的表观密度、导热系数、导温系数和比热容均随受热温度升高逐渐减小;孔隙率随着温度升高而增大,聚丙烯纤维的掺量及长度对混凝土的表观密度和孔隙率无明显影响,说明混凝土水分流失和水化产物分解是导致其高温下质量降低和孔隙增大的主要原因;经历同一温度后聚丙烯纤维掺量越高,混凝土的导热系数和导温系数越小。The thermal performance of polypropylene fiber reinforced concrete(PFRC)with different fiber content and fiber length after high temperature treatment is experimentally studied by transient heat source method.The results show that:The apparent density,thermal conductivity,thermal diffusivity and specific heat of PFRC decrease with the increase of heated temperature;The porosity increases with the increase of temperature,the content and length of polypropylene fiber have no significant influence on the apparent density and porosity of concrete,demonstrating that the concrete mass loss and the porosity raise are mainly attributed by the loss of water and the dehydration reaction of hydrates;The concrete with high fiber content has small thermal conductivity and thermal diffusivity after exposure to high temperature.

关 键 词：高温 聚丙烯纤维混凝土 纤维长度 纤维掺量 热工参数 

分 类 号：X913.4[环境科学与工程—安全科学] TU528.2[建筑科学—建筑技术科学]