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通过冻融循环试验,比较不同水灰比、不同胶凝材料、不同浓度硫酸钠溶液对质量损失的影响。结果表明:相同条件下水泥砂浆试件在5%的硫酸钠溶液中进行冻融循环,其质量随冻融循环次数增加呈逐渐下降的趋势,且水灰比越大,质量损失率越大;随冻融循环次数增加,掺加粉煤灰的砂浆试件对冻融循环由抑制作用变为促进作用,而高抗硫酸盐水泥的抗冻性优于普通硅酸盐水泥;相同水灰比下普通硅酸盐砂浆试件在硫酸盐中的质量损失率比水中小,即硫酸盐中的抗冻性优于水中的抗冻性。
Through the freeze-thaw cycle test, the effects of different water-cement ratios, different cementitious materials and different concentrations of sodium sulfate solution on the mass loss were compared. The results show that under the same conditions, the specimens of cement mortar freeze - thaw cycle in 5% sodium sulfate solution, the quality of the mortar tends to decrease with the increase of the number of freeze - thaw cycles, and the greater the water - cement ratio, the greater the mass loss rate; With the increase of the number of freeze-thaw cycles, the mortar samples with fly ash added to the freeze-thaw cycle by the inhibition effect to promote the high anti-sulfate cement frost resistance is better than ordinary Portland cement; the same water-cement ratio Under ordinary silicate mortar specimens in the sulfate mass loss rate is smaller than water, that is, the frost resistance of sulfate is better than that of water.