Effect of Chlorine Salt on Durability of Mineral Admixture Concrete under Different Conditions  

作　　者：Xupeng Chen Zhuowen Sun Jianyong Pang 

机构地区：[1]School of Civil Engineering and Architecture,Anhui University of Science and Engineering,Huainan,232001,China [2]School of Transportation and Civil Engineering,Nantong University,Nantong,226019,China

出　　处：《Journal of Renewable Materials》2022年第9期2489-2508,共20页可再生材料杂志（英文）

基　　金：the Key Projects of Natural Science Research in Colleges and Universities of Anhui Province,Grant No.KJ2019A1043;Science and Technology Project of Jiangsu Provincial Department of Housing and Urban Rural Development,Grant No.2019ZD001190.

摘　　要：Mineral admixture concrete is a renewable material.It requires less cement than ordinary concrete and is thus beneficial for economical use of resources and environmental protection.To examine the impact of chloride salt on the durability of mineral admixture concrete under various conditions,in this study,test blocks are divided into two major groups:in one group,the test block is eroded by chloride salt on the interior and by sulphate/magnesium salts on the exterior,and in the second group,the test block is eroded by external chloride/sulphate/magnesium salts.Clean water is considered the control group.Dry-wet alternation tests are carried out to investigate the mechanical properties,mass,macromorphology,and ion content of the concrete.Furthermore,a series of methods,such as XRD,FT-IR,SEM,and EDS,are adopted to examine the phase composition and micromorphology of the concrete.The results show that,for the concrete subjected to the corrosion of internal chloride salt and external sulphate/magnesium salts(0–20 cycles),its mechanical properties improve slowly at the initial stage,but at the final stage(80–120 cycles),it is subjected to more severe corrosion compared to those only eroded by a single corrosive ion,such as the chloride/sulfate/magnesium salts.For concretes subjected to external corrosion of chloride/sulphate/magnesium salts,the concrete durability enhances with the concentration increase of the chloride salt.Mg^(2+)and SO_(4)^(2-)could jointly result in destructive damage to the admixture concrete,main generating corrosion products of ettringite,gypsum,Mg(OH)2,thaumasite,and M-S-H.

关 键 词：External corrosion internal corrosion corrosive ions dry-wet alternation DURABILITY 

分 类 号：TU528[建筑科学—建筑技术科学]