硅酸盐通报2018，Vol.37Issue(4)：1125-1131,7.
全浸泡作用下混凝土抗硫酸盐侵蚀性能试验研究
Concrete Resistance to Sulfate Erosion under Full Immersion
摘要
Abstract
The effects of different water-cement ratio cement mortar on the sulfate resistance under full immersion were studied.Ordinary Portland cement, medium sulfur-resistant cement and slag with silica fume cement concrete samples were prepared with water-cement ratio of 0.32 and 0.36.After standard curing for 28 d, the compressive erosion coefficient and relative elastic modulus of the specimen were measured in the 3%Na2SO4solution at(20 ±2)℃, the concrete air content and connected porosity measured after 240 d erosion,and the resistance to sulfate attack of concrete was evaluated at(20 ±2)℃.The results show that,under the effect of(20 ±2)℃full immersion,(1)the resistance to sulfate attack of concrete is E>A>B,and the medium sulfur-resistant cement mainly limit the content of C 3A to improve the resistance to sulfate attack of concrete, which may not work in any environment;(2)The corrosion resistance of 0.36 water-cement ratio is lower than that of 0.32 water-cement ratio, and the resistance to sulfate attack increases with the decrease of water-cement ratio;(3)Low water-cement ratio concrete mixed with mineral powder-silica fume after full immersion conditions to enhance the resistance of sulfate erosion significantly;(4)The resistance coefficient of concrete and its relative elastic modulus is highly correlated.After 240 d of erosion, the air content and connected porosity of the different mix ratio concrete are very close to each other,and the correlation coefficient is 0.93, so it is reasonable to choose test evaluation index,reducing the waste of raw materials and testing work.关键词
硫酸盐侵蚀/抗压侵蚀系数/相对动弹性模量/含气量/连通孔隙率/相关性Key words
sulfate attack/resistance coefficient/relative elastic modulus/air content/connected porosity/correlation分类
建筑与水利引用本文复制引用
谢智刚,王起才,代金鹏,王振宇,田祥富,薄士威..全浸泡作用下混凝土抗硫酸盐侵蚀性能试验研究[J].硅酸盐通报,2018,37(4):1125-1131,7.基金项目
长江学者和创新团队发展计划滚动支持(IRT_15R29) （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) （2016-ZJKJ-PTJS04）
兰州交通大学青年科学基金(2017015) （2017015）
