耐腐蚀混凝土辅料的试验研究

研究目的:为了提高混凝土耐海水、土壤中盐等的腐蚀性能,作者提出了在混凝土中掺加耐腐蚀辅料的方法。研究方法:通过混凝土离子渗透性试验、硫酸盐腐蚀试验、干湿腐蚀循环试验等对耐腐蚀辅料的性能进行了测试,并对该耐腐蚀混凝土辅料的耐腐蚀机理进行了分析。研究结果:(1)在硫酸盐腐蚀试验中,掺耐腐蚀辅料的水泥90d腐蚀中的耐腐蚀系数高于1.0;(2)在100次干湿腐蚀循环后,基准混凝土干湿腐蚀循环系数只有0.79,而掺耐腐蚀辅料的混凝土Kx达到1.28;(3)在氯离子渗透试验方面,掺耐腐蚀辅料混凝土28d、90d渗透系数分别为28d基准混凝土的43.1%和9.3%。研究结论:耐腐蚀辅料能够有效的改善混凝土内部孔隙结构特征和水泥与骨料的界面结构。

Experimental Research on the Anticorrosive Mixture of Concrete

Research purposes: To improve performances of concrete in sea or soil with some inorganic salt, the author gives the means which the anticorrosive mixture is used in concrete. Research methods:The performances of concrete with the anticorrosive mixture were investigated in the experiments, such as concrete chloride diffusivity, sulfate resistance and drying/wetting cycle in corrosive environments, etc. Its mechanism was analyzed and discussed. Research results:(1) Anticorrosive modulus of cement with the anticorrosive mixture was more than 1.0 after 90d in sulphate/water liquid; (2) Modulus of drying and wetting cycle in corrosive environments of normal concrete was only 0.79 and one of the concrete with the anticorrosive mixture was 1.28. (3) The coefficient of chloride diffusivity in concrete with the anticorrosive mixture at the age of 28d and 90d is 43.1 % and 9.3 % of one in the normal concrete at age 28d respectively. Research conclusions:It is effective to improve interface structure between cement and aggregate and cavity structure in the concrete with the anticorrosive mixture.