低温干湿循环条件下砂浆抗硫酸盐侵蚀性能试验研究  

Sulfate Resistance of Mortar under Low Temperature Dry-wet Circulation

作　　者：郭玉柱[1] 王起才[1] 王云天[1] 代金鹏[1] 谢松林[1] 薄士威 

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州730070 [2]甘肃省交通规划勘察设计院股份有限公司,兰州730000

出　　处：《硅酸盐通报》2017年第12期4250-4255,共6页Bulletin of the Chinese Ceramic Society

基　　金：长江学者和创新团队发展计划滚动支持(IRT_15R29);中国交建2016年创新平台建设应用基础研究项目(2016-ZJKJ-PTJS04)

摘　　要：研究了不同水胶比水泥砂浆试件在低温干湿循环条件作用下的抗硫酸盐侵蚀性能。试验制作了0.36与0.5两种水胶比的普通硅酸盐水泥、中抗硫水泥以及矿粉-硅灰复掺的水泥砂浆试件,检测了试件标养28 d后的孔结构及各试件在(5±1)℃的3%Na_2SO_4溶液中干湿循环后的强度、动弹性模量变化情况,对砂浆在低温干湿循环条件下的抗硫酸盐侵蚀性能进行了评价,并分析了检测指标间的相关性。结果表明:低温干湿循环条件下,0.5水胶比砂浆抗硫酸盐侵蚀性能低于0.36水胶比砂浆,抗硫酸盐侵蚀性能随着水胶比的降低而提高;低水胶比砂浆复掺矿粉-硅灰后抗低温干湿循环条件下的硫酸盐侵蚀性能提升明显;两个水胶比砂浆的相对动弹模均与抗压强度高度相关。The effects of different water-cement ratio cement mortar on the sulfate resistance under low temperature dry-wet cycle were studied. Ordinary portland cement,medium sulfur-resistant cement and slag with silica fume cement mortar samples were prepared with water-cement ratio of 0. 36 and 0. 5.After standard curing for 28 d,the pore structure of the specimen was examined. Mortar samples were dry-wet cycle in 3% Na2SO4 sulfate solution at（ 5 ± 1） ℃,and their strength and dynamic modulus developments were measured. Then the corrosion resistance of the mortar under low temperature dry-wet cycle was evaluated and the correlation between the detection indexes was analyzed. The results show that under the condition of low temperature and dry-wet cycle,the corrosion resistance of 0. 5 water-cement ratio is lower than that of 0. 36 water-cement specimen,and the resistance to sulfate attack increases with the decrease of water-cement ratio; Low-water-cement mortar mixed with mineral powder-silica fume after low temperature dry-wet cycle conditions to enhance the performance of sulfate erosion significantly.The relative elastic modulus of the two water-cement mortars is highly correlated with the compressive strength.

关 键 词：低温 干湿循环 硫酸盐侵蚀 孔结构 相对动弹模 相关性 

分 类 号：TU528.041[建筑科学—建筑技术科学]