干湿-冻融交替作用下硅灰混凝土耐久性分析  

Analysis of Durability of Silica Lime Concrete Under Alternate Action of Wet-Dry and Freeze-Thaw

作　　者：杨志强 陈志敏[1] 袁乾龙 曾佑理 YANG Zhiqiang;CHEN Zhimin;YUAN Qianlong;ZENG Youli(School of Civil Engineering,LanzhouJiaotong University,Lanzhou 730070,China;The Second Engineering Bureau of China Construction Co.,Ltd.,Beijing 100160,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中国建筑第二工程局有限公司,北京100160

出　　处：《兰州工业学院学报》2023年第3期53-57,共5页Journal of Lanzhou Institute of Technology

基　　金：国家自然科学基金(12262018);中国建筑第二工程局有限公司科技资助计划(2020ZX150002)。

摘　　要：为探究硅灰混凝土在冻融条件下硫酸盐腐蚀抗压强度损失规律,在水胶比(W/C=0.37)相同的条件下,对硅灰掺量为0%、5%、10%、15%的混凝土分别进行5%硫酸盐干湿侵蚀、清水冻融循环及5%硫酸盐干湿侵蚀+冻融循环各75 d,研究不同试验条件、不同天数下的抗压强度变化。结果表明:3种试验中,强度损伤度由大到小为干湿+冻融>冻融>干湿,干湿+冻融双重作用对混凝土强度的劣化有促进作用;且随着天数的增加混凝土抗压强度损失速率加快,在0%和5%硅灰掺量60 d、干湿+冻融双重作用下混凝土强度损失出现超叠加效应,硅灰掺量的提高使混凝土强度的损失速率变慢。In order to explore the loss regularity of sulfate corrosion compressive strength of silica fume concrete under freeze-thaw conditions,under the same water-binder ratio(W/C=0.37),concrete with different silica fume content of 0%,5%,10%and 15%are subjected to dry-wet erosion of 5%sulfate,freeze-thaw cycle of clear water and dry-wet erosion of 5%sulfate+freeze-thaw cycle for 75 days respectively,to study the changes of compressive strength under different conditions and tests in different days.The results show that the damage degree of strength in the three tests is from large to small:dry-wet+freeze-thaw>freeze-thaw>dry-wet,the double action of dry-wet+freeze-thaw promotes the deterioration of concrete strength.With the increase of days,the loss rate of concrete compressive strength accelerates.With the addition of 0%and 5%silica fume for 60 days,the loss of concrete strength under the double action of dry-wet+freeze-thaw appears superimposition effect.With the increase of silica fume content,the deterioration rate of concrete strength slows down.

关 键 词：硅灰 干湿 冻融 硫酸盐侵蚀 抗压强度 

分 类 号：TU528.41[建筑科学—建筑技术科学]