冻融环境下引气混凝土的抗钢筋锈蚀能力研究

摘要

对带钢筋的普通混凝土及引气混凝土试件进行抗冻融循环试验，在不同冻融损伤程度下对试件进行氯离子侵蚀试验。利用半电池电位法和线性极化法分别测定经过不同冻融循环次数下混凝土试件内部钢筋的电位和腐蚀电流密度，从而定量地确定混凝土内部钢筋的锈蚀情况。研究结果表明：向混凝土内部掺入一定比例引气剂，可以提高混凝土的抗冻性能，从而增强其在腐蚀环境下抗钢筋锈蚀能力，提高了混凝土的耐久性能；对试件进行劈裂试验后，钢筋的实际锈蚀情况与利用由化学方法测定结果一致。%The freeze-thaw cycle tests of the ordinary concrete specimen and the air entraining concrete specimen with steel were carried out ,and the chloride corrosion tests under different freeze-thaw damage degrees were done . The potential values and corrosion current density of steel in concrete specimens were determined under different freeze-thaw cycle times by using half-cell potential method and linear polarization method ,then the steel corrosion condition in concrete was qualitatively determined . The study results show that adding air entraining agent can improve the anti-freeze property of concrete ,promote the ability of resistance to steel corrosion , and prolong the durability of concrete structure .After specimen splitting test ,the actual steel corrosion condition has the same result with the result by chemical approach .