橡胶-再生骨料保温混凝土热传输机理及微观结构分析
Heat transfer mechanism and microstructure analysis of rubber-recycled aggregate insulated concrete
屠艳平 1谢俊杰 1程书凯 1陈国夫 2白登显 1邓丽3
作者信息
- 1. 武汉工程大学土木工程与建筑学院,武汉 430073;武汉工程大学湖北省绿色土木工程材料与结构工程研究中心,武汉 430073
- 2. 广安职业技术学院土木工程学院,四川广安 638500
- 3. 武汉工程大学土木工程与建筑学院,武汉 430073
- 折叠
摘要
采用橡胶颗粒(RP)、再生骨料(RA)作为保温轻骨料,纳米SiO2(NS)作为辅助胶凝材料,制备橡胶保温混凝土(IRC).通过自然光照和模拟光照下的环境模拟试验,并结合材料密度、吸水率、导热系数、微观孔结构等指标,研究IRC的热工性能及热传输机理.结果表明:RP的掺加引入了大量孔隙,密度、吸水率和孔容逐渐增大,形成了多孔结构,提高了 IRC的保温性能,RP掺量为20％时,导热系数为1.01 W(m·K)-1;NS的掺加细化了 IRC的孔径,破坏了连通的热流通道,进一步提高了 IRC的保温性能,掺入3％的NS后,导热系数进一步降低7.8％～9.4％.
Abstract
Rubber insulated concrete(IRC)was prepared by using rubber particles(RP)and recycled aggregate(RA)as insulating lightweight aggregate and adding nano-silica(NS)as auxiliary cementitious material.The thermal conductivity and heat transfer mechanism of IRC were investigated through environmental simulation tests under natural and simulated light,and combined with the indexes of material density,water absorption,thermal conductivity,and microscopic pore structure.The results showed that the addition of RP introduced a large number of pores,and the density,water absorption and pore volume gradually increased,forming a por-ous structure and improving the thermal insulation performance of IRC.When the RP content is 20％,the ther-mal conductivity of concrete is 1.01 W/(m·K).The addition of NS optimized the microporous structure of IRC,refined the pore size,and disrupted the connected heat flow channels,which further improved the thermal insulation performance of IRC.The thermal conductivity is further reduced by 7.8％-9.4％with 3％NS.
关键词
保温混凝土/纳米SiO2/再生骨料/导热系数/孔结构/建筑节能Key words
insulating concrete/nano-silica/recycled aggregates/thermal conductivity/pore structure/building en-ergy efficiency引用本文复制引用
基金项目
国家自然科学基金(52208286)
湖北三峡实验室项目(SC211011)
武汉工程大学科研项目(K2021031)
出版年
2024
NETL
NSTL
万方数据