Abstract: Air-entraining agent is a chemical admixture used to improve frost resistance of concrete in concrete freeze-thaw damage. The mechanism of action is to introduce a large number of bubbles in the concrete mixing process to change the pore structure of the concrete and then reduce the icing pressure in the freeze-thaw damage. The physical crystallization damage of concrete is similar to the freeze-thaw damage in the failure mechanism. It is the change of the shape of the liquid in the pores of the concrete after the temperature or humidity changes. Therefore, in theory, the addition of air entraining agent should also alleviate the physical crystallization damage of concrete.So,in the environment of constant temperature and humidity (temperature (18±1) ℃, relative humidity (50±5)%), sulphoaluminate cement concrete specimens with 0, 0.5 air entraining agent were partially immersed in 10% sodium sulphate solution .The deformation morphology of concrete moisture evaporation zone, strength and mass loss rate and pore diameter change were analyzed after immersion for 35 d, 70 d and 130 d,in order to explore the effect of air entraining agent on the physical crystallization damage of concrete.The results show that the incorporation of air entraining agent will change the pore size distribution and pore shape of concrete. The proper amount of air entraining agent can improve the sulfate resistance of sulphoaluminate cement concrete, however, when the air entraining agent is excessively mixed, the concrete specimens became softer, which in turn leads to more severe strength loss.
作者简介: 胡文龙,中南大学土木工程学院硕士研究生,主要从事混凝土硫酸盐侵蚀领域的研究。刘赞群,中南大学教授。2009年毕业于中南大学,获土木工程材料博士学位。主要从事高铁用关键工程材料、水泥乳化砂浆、自密实混凝土和混凝土耐久性等方向的研究。国际期刊Construction and Building Materials和国内刊物《硅酸盐学报》的审稿人。近年来主持和参加多项国家自然科学基金,在国内外重要期刊发表学术论文20余篇,获省部级以上科研奖励3项zanqun.liu@csu.edu.cn
引用本文:
胡文龙, 刘赞群, 裴敏. 引气剂对硫铝酸盐水泥混凝土硫酸盐结晶破坏的影响[J]. 材料导报, 2019, 33(z1): 239-243.
HU Wenlong, LIU Zanqun, PEI Min. Effect of Air Entraining Agent on Sulfate Crystallization Distress on Sulphoaluminate Cement Concrete. Materials Reports, 2019, 33(z1): 239-243.
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2019, Vol. 33 
