试件水灰比和胶砂比对混凝土硫酸盐侵蚀速度影响

通过大量试验,采用强度指标研究了试件水灰比和胶砂比对硫酸盐侵蚀速度的影响.结果表明:试件的水灰比越大,胶砂比越小,侵蚀速度越快;为了加快硫酸盐侵蚀速度,宜采用大水灰比、小胶砂比的试件.在各种条件下,硫酸钠侵蚀破坏的速度比硫酸镁侵蚀快.对硫酸钠型侵蚀,采用抗折抗蚀系数作为判定指标较为合理,而对硫酸镁型侵蚀,应该综合考虑抗折抗蚀系数和抗压抗蚀系数.

Investigations on the Effect of Water/Cement Ratio and Cement/Sand Ratio on the Rate of Concrete Sulfate Attack

Through many tests and strength analysis, the effects of water/cement ratio and cement/sand ratio on the rate of concrete sulfate attack were investigated. The test results show that the speed of attack is accelerated with the increasing of water/cement ratio, and the decreasing of cement/sand ratio. The specimen of large water/cement ratio and small cement/sand ratio should be adopted in order to accelerate the test speed of sulfate attack. The speed of attack of sodium sulfate is faster than that of magnesium sulfate under various conditions. It is suitable to adopt the coefficient of tensile strength as the accelerated assessing criterion for the attack of sodium sulfate. The coefficient of tensile and compressive strength should be considered together for the attack of magnesium sulfate.