盐渍环境干湿循环下天然浮石混凝土的损伤  

Damage of natural pumice concrete under drying and wetting cycles in saline solution

作　　者：王萧萧[1,2] 奇雨欣 刘曙光 闫长旺[3] WANG Xiaoxiao;QI Yuxin;LIU Shuguang;YAN Changwang(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;School of Mining and Technology,Inner Mongolia University of Technology,Hohhot 010051,China)

机构地区：[1]内蒙古工业大学土木工程学院,呼和浩特010051 [2]内蒙古工业大学材料科学与工程学院,呼和浩特010051 [3]内蒙古工业大学矿业学院,呼和浩特010051

出　　处：《中国科技论文》2019年第2期188-192,共5页China Sciencepaper

基　　金：国家自然科学基金资助项目(51609119);内蒙古自治区自然科学基金资助项目(2016BS0503);内蒙古自治区高等学校"青年科技英才支持计划"资助项目(NJYT-18-B24)

摘　　要：针对内蒙古地区河套灌区的工程环境,通过干湿循环试验,研究不同外加剂掺量以及不同强度天然浮石混凝土在2种介质(清水、盐渍溶液)作用下质量损失、相对动弹模量的宏观变化规律,利用环境扫描电子显微镜(scanning electron microscope,SEM)研究其损失机理。试验结果表明:干湿循环初期,质量和相对动弹模量均呈现增长趋势;随着循环次数的增加,都出现了不同程度的损失。5组天然浮石混凝土的损失率为:LC20>LC25>LCB>LC30>LCA;盐渍溶液对天然浮石混凝土的损失率大于清水,且与微观结构性能的变化一致。According to the engineering environment of Hetao Irrigation District in Inner Mongolia,the macroscopic changes of mass loss and relative dynamic elastic modulus with different admixtures and different strength natural pumice concrete under the action of two medium(clear water,saline solution)were evaluated through dry-wet cycle tests.Then,environmental scanning electron microscope(SEM)was used to study its loss mechanism.The test results showed that both the mass and the relative dynamic elastic modulus have an increasing trend at the beginning of the dry-wet cycle.As the number of cycles was increased,both have experienced different degrees of loss.The loss rate of five groups of natural pumice concrete was LC20>LC25>LCB>LC30>LCA.The loss rate of natural pumice concrete in salt solution was greater than the loss rate in clear water,which was consistent with the performance exhibited by the microstructure.

关 键 词：干湿交替 天然浮石混凝土 相对动弹模量 质量损失 微观结构 

分 类 号：TU528[建筑科学—建筑技术科学]