硫酸盐侵蚀和冻融循环作用对砂浆质量损伤的影响研究  

Study on influence of sulfate erosion and freeze-thaw cycle on mass loss of cement mortar

作　　者：刘洪珠[1] 赵铁军[1] 曹承伟[1] 刘庆[1] 

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《工程建设》2015年第6期12-16,共5页Engineering Construction

基　　金：国家重点基础研究发展计划"973"项目(2015CB655100)

摘　　要：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 freeze-thaw cycle test, the influences of different water ce- ment ratio, different cementitious materials and different concentration of sulfate solution on the mass loss were compared. The results show that, the mass of mortar specimens decreases with the increase of the number of freeze-thaw cycles in 5 % sodium sulfate solution, and the bigger the water cement ratio is, the higher the mass loss rate is. With the increase of the number of freeze-thaw cycles, the mortar specimens with pulverized fly ash become positive from passive to the freeze cycle, and the frost re- sistance of high sulfate resistant cement is better than that of ordinary Portland cement. The mass loss of Ordinary Portland cement mortar specimens is lower than that in water at the same water cement ratio, that is, the frost resistance in sulfate solution is better than that in water.

关 键 词：冻融循环 质量损失 硫酸盐 抗冻性 

分 类 号：TU528[建筑科学—建筑技术科学]