多种内防腐措施对提高混凝土耐久性的作用效果对比研究

Comparative study on the effect of various internal anticorrosion measures on improving concrete durability

对多种混凝土内防腐措施的防腐效果进行对比,并结合混凝土耐久性设计的要求,提出不同腐蚀环境下混凝土适用的防腐措施。结果表明,高性能混凝土在满足强度设计前提下,耐久性大幅提升;混凝土防腐剂提高了混凝土密实性,对提高抗氯离子渗透和硫酸盐腐蚀都有一定的效果;引气混凝土对提高干湿循环的抗硫酸盐腐蚀有一定效果,在弱腐蚀环境单独使用简单有效,在强腐蚀环境时可以作为辅助措施与其它措施共用;抗硫酸盐水泥对抗硫酸盐腐蚀具有良好的效果,但对抗氯离子渗透性无明显作用,2种腐蚀因素环境下不宜单独使用。

Comparing the anti-corrosion effects of various concrete anti-corrosion measures,combined with the requirements of concrete durability design,put forward anti-corrosion measures applicable to concrete under different corrosive environments. The re- sults show that the high-performance concrete can greatly improve the durability under the premise of satisfying the strength de- sign. The concrete preservative improves the compactness of the concrete and has certain effects on improving the resistance to chloride ion penetration and sulfate corrosion. The air-entrained concrete has a certain effect on improving the anti-sulfate corro- sion of the dry-wet cycle, and is simple and effective in the weak corrosion environment. In the case of strong corrosive environ- ment,it can be used as an auxiliary measure to share with other measures： anti-sulfate cement has good effect against sulfate cor- rosion,but has no obvious effect against chloride ion permeability. It is not suitable to use it alone under the environment of two kinds of corrosion factors.