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

Abstract: 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％Na2 SO4 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.

Key words: low temperature;dry-wet cycle;sulfate attack;pore structure;relative elastic modulus;correlation