混合侵蚀与冻融交替作用下混凝土性能劣化试验  

EXPERIMENT OF PROPERTIES DETERIORATION OF CONCRETE IN MULTI-AGGRESSIVE AND FREEZE-THAW ENVIRONMENT

作　　者：李艳东[1] 叶英华[1] 张健[1] 周煜[1] 

机构地区：[1]北京航空航天大学土木工程系,北京100191

出　　处：《工业建筑》2011年第6期120-123,共4页Industrial Construction

基　　金：国家自然科学基金(50778010);国家科技支撑计划项目(2007BAF23B02-06);北京市自然科学基金(8092020);亚热带建筑科学国家重点实验室开放课题资助

摘　　要：以质量分数为3%的氯化钠和5%的硫酸钠混合溶液为侵蚀介质,采用慢冻法,对立方体抗压强度为54.7 MPa的混凝土试件进行0,100,200,300次冻融循环试验,并测定各组试件的质量损失、抗压强度、相对动弹性模量和应力、应变等试验数据。结果表明:随着冻融循环次数的增多,混凝土试件表面剥蚀加剧,表观质量和相对动弹性模量无明显变化,抗压强度及弹性模量均有大幅降低。当冻融循环为300次时,抗压强度和弹性模量分别下降了26%和35.1%。With mass fraction of 3% sodium chloride and 5% sodium sulfate mixed solution as aggressive medium,by adopting slow freeze-thaw method,freeze-thaw tests of freeze-thaw cycles of being 100,200 and 300 were carried out on concrete specimens.The cubic compressive strength was 54.7MPa.The mass loss,compressive strength,relative dynamic modulus,strain and stress were tested.The results show that with the increase in freeze-thaw cycles,increased erosion of concrete specimen surface and the apparent quality and relative dynamic modulus did not change significantly when both of compressive strength and elastic modulus decreased a lot.Compressive strength and elastic modulus decreased by 26% and 35.1% after 300 freeze-thaw cycles.

关 键 词：混凝土 冻融循环 混合侵蚀 性能劣化 

分 类 号：TU528[建筑科学—建筑技术科学]