复掺偏高岭土和硅灰对聚苯乙烯泡沫混凝土力学性能的影响研究  

Effects of Mixed Metakaolin and Silica Fume on Mechanical Properties of EPS Concrete

作　　者：陈晓 王秀丽[2,3] 侯鸿杰 马云龙 潘旭宾 胡恩金 CHEN Xiao;WANG Xiuli;HOU Hongjie;MA Yunlong;PAN Xubin;HU Enjin(Gansu Construction Investment Civil Engineering Construction Group Co.,Ltd.,Lanzhou 730070,China;Lanzhou University of Technology,School of Civil Engineering,Lanzhou 730050,China;Western Center of Disaster Mitigation of Ministry of Education,Lanzhou 730050,China)

机构地区：[1]甘肃建投土木工程建设集团有限责任公司,兰州730070 [2]兰州理工大学土木工程学院,兰州730050 [3]西部土木工程防灾减灾教育部工程研究中心,兰州730050

出　　处：《工业建筑》2022年第9期229-233,共5页Industrial Construction

基　　金：国家重点研发计划项目(2019YFD1101004);甘肃省建设科技攻关项目(JK2020-26);兰州市科技项目(2020-2-4)。

摘　　要：为研究不同掺量的偏高岭土和硅灰对聚苯乙烯泡沫(EPS)混凝土物理力学性能的影响,以不同掺量的偏高岭土和硅灰作为辅助胶凝材料,分别以0%、5%、10%和15%的掺量代替部分水泥,制备了16组不同配合比的EPS混凝土试件,对其吸水率、抗压强度、抗折强度以及劈裂抗拉强度进行了测量。结果表明:一定量的硅灰和偏高岭土的掺入能降低EPS混凝土的吸水率,并能提高其抗压、抗折和劈裂抗拉强度,但当掺量过高时,又会使吸水率增加,强度下降,且二者掺量均为10%时,EPS混凝土的吸水率最低且力学性能最优;虽然偏高岭土的颗粒尺寸大于硅灰,但其“火山灰效应”更强,因而对EPS混凝土力学性能的提高优于硅灰;偏高岭土的硅灰可以改善EPS颗粒与胶凝基体的黏结作用。In order to study the effect of different dosages of metakaolin and silica fume on the physical and mechanical properties of EPS concrete,metakaolin and silica fume with different contents were used as auxiliary cementing materials,and the contents of 0%,5%,10%and 15%were used to replace part of the cement,respectively,and 16 groups of EPS concrete specimens with different proportions were prepared.The water absorption,compressive strength,flexural strength and splitting tensile strength were measured.The results showed that the addition of a certain amount of silica fume and metakaolin could reduce the water absorption of EPS concrete and improve its compressive strength,bending and splitting tensile strength,but when the dosage was too high,the water absorption would increase and the strength would decrease,and when the content of both was 10%,EPS concrete had the lowest water absorption and the best mechanical properties.Although the particle size of metakaolin was larger than that of silica fume,its“pozzolanic effect”was stronger,so the improvement of the mechanical properties of EPS concrete was better than that of silica fume.Metakaolin and silica fume could improve the adhesion of EPS particles to the gel matrix.

关 键 词：EPS混凝土 偏高岭土 硅灰 物理力学性能 黏结 

分 类 号：TU528.2[建筑科学—建筑技术科学]