海水侵蚀环境与冻融交替作用下引气混凝土性能劣化试验  

Experiment of properties deterioration of air-entrained concrete in seawater-aggressive and freeze-thaw environment

作　　者：周煜[1,2] 叶英华[1,2] 袭杰[1,2] 张健[1,2] 

机构地区：[1]北京航空航天大学土木工程系,北京100191 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640

出　　处：《混凝土》2011年第12期18-20,共3页Concrete

基　　金：国家自然科学基金(51078015);北京市自然科学基金(8092020);亚热带建筑科学国家重点实验室重点开放课题(2009KA03)

摘　　要：以质量分数为3%氯化钠+0.34%硫酸镁配制的海水作为侵蚀液体,对引气混凝土试件进行海水浸泡与冻融循环交替作用试验,并分别测定经历102次、201次和300次冻融循环后试件的质量损失、相对动弹性模量和抗压强度等数据。结果表明:随着冻融循环次数增多,质量损失率和相对动弹性模量无明显变化,而抗压强度大幅降低。当冻融循环为300次时,质量损失率达0.28%,相对动弹性模量为100.21%,抗压强度下降了11.16%。With the mass fraction of 3% sodium chloride＋0.34% magnesium sulfate as aggressive medium, freeze-thaw tests of freeze-thaw cycles of being 102,201,300 were carried out on air-entrained concrete specimens, then the mass loss, compressive strength, relative dynamic modulus were tested.The results show that with the increase of times of freeze-thaw cycles, specimens of mass loss rate and relative dynamic modulus were not obvious change in artificial seawater,however mass loss rate decreased by 0.28% ,relative dynamic modulus increase to 100.21%, compressive strength decreased by 11.16% after 300 freeze-thaw cycles.

关 键 词：引气混凝土 冻融循环 混合侵蚀 性能劣化 

分 类 号：TU528.01[建筑科学—建筑技术科学]