复杂环境下水泥改性生土砌块的导热系数及抗压强度分析  

Analysis of thermal conductivity and compressive strength of cement modified raw soil blocks in complex environment

作　　者：马军涛 王大广 陈浩 石艳柯 MA Juntao;WANG Daguang;CHEN Hao;SHI Yanke(School of Civil Engineering and Communication,North China University of Water Resources and Electric Power,Zhengzhou 450045,China)

机构地区：[1]华北水利水电大学土木与交通学院

出　　处：《新型建筑材料》2019年第12期113-116,共4页New Building Materials

基　　金：国家自然科学基金项目(51508191);河南省科技攻关项目(172102210375,182102210337)

摘　　要：生土基材料具有较好的蓄热和保温性能,但其在复杂环境下的保温性能研究较少。使用水泥等材料对生土进行改性并制备改性生土砌块,分别研究了其在碳化、浸水和冻融循环条件下导热系数的变化规律,并对其机理进行分析。结果表明,经过碳化后的水泥改性生土砌块导热系数有所降低;浸水14 d后导热系数增大30%以上;而冻融循环15次后,其导热系数为未冻融砌块的2倍以上,保温性能明显下降。Raw soil-based materials show excellent thermal storage and preservation ability,while the thermal insulation performance in the complex environment is seldom studied.In this article,raw soil is modified by cement and others materials and the raw soil blocks are prepared.The variation law of thermal conductivity of blocks in carbonation,water immersion and freeze-thaw cycle environment are analyzed,and the mechanism is studied.The results show that the thermal conductivity decreases after carbonation but increases by over 30%after immersed for 14 d.After 15 times freeze-thaw cycle,the thermal conductivity is over 2 times of that of block without freeze-thaw cycle,which reduces the thermal preservation ability obviously.

关 键 词：生土砌块 水泥 导热系数 碳化 浸水 冻融 

分 类 号：TU522.3[建筑科学—建筑技术科学]