格尔木盐湖地区内掺阻锈剂对钢筋混凝土耐久性影响

阻锈剂常用来缓解混凝土中钢筋锈蚀问题,而阻锈剂种类是否对混凝土耐久性有一定影响尚需要进行进一步研究。因此分别制备内掺阻锈剂Ca(NO₂)₂(又称CAN)和C₄H₁₁NO(又称CN)混凝土,并对两组试件在格尔木盐湖地区进行现场暴露试验。每3个月对试件进行电化学试验研究、超声波检测、质量检测,以混凝土中钢筋锈蚀程度、混凝土中裂缝的发展、混凝土的质量损失三方面对其耐久性的影响进行分析。研究表明,两组试件经过180 d现场暴露,其内部钢筋达到了低锈蚀状态,经过810 d后的现场暴露,A组试件中钢筋就达到中等锈蚀状态,而B组钢筋依然处于低锈蚀状态。经过810 d的现场暴露,A、B组试件的相对质量评价参数ω₁值分别为0.42、0.46,相对动弹性模量评价参数ω₂值分别为0.47、0.53,自暴露180 d后,同时期A组试件的ω₁和ω₂值小于B组试件。在810 d时A、B组试件的表面最大裂缝分别达到了0.15 mm、0.11 mm左右。阻锈剂CN对混凝土耐久性的提升效果要好于CAN。

Influence of Corrosion Inhibitor on Durability of Reinforced Concrete in Golmud Salt Lake Area

Corrosion inhibitors are usually used to alleviate steel corrosion in concrete, and whether the types of corrosion inhibitors have a certain impact on the concrete durability needs further research. Therefore, concrete mixed with Ca(NO₂)₂ (also known as CAN) and C₄H₁₁NO (also known as CN) were prepared, and field exposure tests were conducted on the two specimens in the Golmud salt lake area. The electrochemical experiment, ultrasonic testing and quality testing were conducted respectively every three months. The durability was analyzed from three aspects: steel corrosion in concrete, crack formation of concrete and quality loss of concrete. The results show that the internal steel of two groups reaches to a low corrosion state at 180 d, and the internal steel of groups A and B reach to a medium corrosion state and a low corrosion state at 810 d. At 810 d, the ω₁ (relative quality evaluation parametes) values of groups A and B are 0.42 and 0.46, and the ω₂ (relative dynamic modulus of elasticity evaluation parametes) values are 0.47 and 0.53, respectively. After 180 d of exposure, ω₁ and ω₂ values of group A are smaller than those of group B. At 810 d, the maximum cracks on the surface of groups A and B reach about 0.15 mm and 0.11 mm, respectively. Corrosion inhibitor CN improves the durability of concrete better than CAN。