冻融循环后钢纤维混凝土氯离子侵蚀性能研究

Chloride Corrosion Resistance of Steel Fiber Reinforced Concrete after Cycles of Freezing and Thawing

为探索经受冻融循环后的钢纤维混凝土在氯盐环境作用下的耐久性能,通过对冻融循环不同次数后的钢纤维混凝土试件开展氯离子侵蚀试验,分析了钢纤维掺量、冻融循环次数等因素对氯盐侵蚀环境下钢纤维混凝土耐久性的影响规律并探索了冻融损伤对钢纤维混凝土氯离子侵蚀性能的影响机理。研究结果表明：钢纤维掺量在0~1.5%范围内,钢纤维掺量越大,相同渗透深度处混凝土氯离子扩散系数越小,混凝土抵抗氯离子侵蚀的性能越好;冻融循环次数越大,钢纤维混凝土氯离子扩散系数越大,混凝土抵抗氯离子侵蚀的性能越差。

Experiment of chloride corrosion to steel fiber reinforced concrete after different cycle times of freezing and thawing is carried out to understand the durability of steel fiber reinforced concrete under the chloride corrosion environment. The influence factors of steel fiber content and cycle times of freezing and thawing to durability of steel fiber reinforced concrete under the chloride environment are analyzed. Furthermore, the mechanism of the effect of freezing and thawing damage on chloride corrosion resistance also been discussed. It is proved that the more steel fiber adding in concrete in 0-1.5% range but the lower chloride diffusion coefficient of concrete over the same deepness and. And the chloride corrosion resistance of steel fiber reinforced concrete also will be better. In addition, the more cycles of freezing and thawing that chloride diffusion coefficient of concrete is greater. And the chloride corrosion resistance of steel fiber reinforced concrete also will be worse.