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在硫酸盐侵蚀环境下,混凝土内部硫酸盐腐蚀产物的生成是造成混凝土体积膨胀破坏和耐久性劣化的主要原因。通过测定不同硫酸盐侵蚀龄期(30 d,60 d,90 d,120 d,150 d,180 d),不同水灰比(0.4,0.5,0.6)下普通硅酸盐水泥和高抗硫酸盐水泥砂浆的抗折强度,研究硫酸盐侵蚀对砂浆抗折强度的影响。试验结果表明,通过5%硫酸钠溶液长期浸泡试验,水泥砂浆试件抗折强度随着侵蚀龄期的增加呈先增大后下降的变化趋势;对于普通硅酸盐水泥试件来说,水灰比越大,抗折强度开始出现下降的龄期越早;高抗硫酸盐水泥砂浆试件出现强度下降的龄期较普通硅酸盐水泥砂浆晚,且0.4水灰比高抗硫酸盐水泥砂浆试件至侵蚀后期,其抗折强度均未出现明显下降,说明高抗硫酸盐水泥较普通硅酸盐水泥具有较好的抗硫酸盐侵蚀性能。
In the sulphate erosion environment, the formation of sulfate corrosion products inside the concrete is the main reason that causes the volume expansion failure and the durability deterioration of the concrete. Through the determination of ordinary Portland cement and high sulfate resistance at different water-cement ratio (0.4,0.5,0.6) under different sulfate attack ages (30 d, 60 d, 90 d, 120 d, 150 d, 180 d) The flexural strength of cement mortar, the impact of sulfate attack on the flexural strength of mortar. The test results show that the flexural strength of cement mortar samples increases first and then decreases with the increase of erosion age through the long-term immersion test of 5% sodium sulfate solution. For ordinary Portland cement samples, the water The higher the ash ratio, the earlier the age at which the flexural strength began to decline. The age at which the strength of high-resistant sulfate cement mortar decreased gradually was lower than that of ordinary Portland cement mortar and the ratio of 0.4 to cement was higher than that of sulfate cement The mortar specimens to the late erosion, the flexural strength were not significantly decreased, indicating that high resistance to sulfate cement than ordinary portland cement has good resistance to sulfate attack.