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通过在实验室浸泡的方法,对不同应力状态下、不同水灰比的普通硅酸盐混凝土试件进行抗氯离子侵蚀试验,研究不同强度等级混凝土在应力和氯离子侵蚀的共同作用下氯离子的扩散规律和分布规律。研究发现:在压应力状态下,氯离子含量会随压应力增大而减小,相反,在拉应力状态下,氯离子含量会随拉应力的增大而增大,但随着切片深度的增加,这种影响会逐渐减弱。在抗氯离子侵蚀性能方面,高强度混凝土对应力的影响更敏感。所得到的不同应力状态下、不同切片深度的混凝土结构中氯离子浓度分布,可为推导扩散系数和评估钢筋锈蚀程度提供分析依据。
Chloride ion erosion tests were carried out on ordinary silicate concrete specimens under different stress states and different water-cement ratios by means of immersion in a laboratory to study the effect of chloride ion erosion on concrete with different strength grades under the action of stress and chloride ion erosion The law of diffusion and distribution. The results show that the content of chloride ion decreases with the increase of compressive stress under compressive stress. On the contrary, the content of chloride ions increases with the increase of tensile stress under tensile stress. However, Increase, this effect will gradually diminish. In the resistance to chloride ion erosion, high-strength concrete is more sensitive to the effects of stress. Under different stress conditions, the distribution of chloride ion concentration in concrete structures with different slice depths can provide an analytical basis for deriving the diffusion coefficient and evaluating the corrosion degree of steel bars.