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通过试验研究不同水灰比和锂渣替代率的混凝土试件在不同侵蚀龄期、氯盐溶液浓度的作用下,探讨锂渣对混凝土抗氯离子侵蚀性能的影响。试验采用自然浸泡法研究氯离子在饱和混凝土中扩散传输性能,通过钻芯取样,分层研磨,依照水溶性氯离子含量的测定方法获取各试件不同深度的氯离子浓度。结果表明,氯离子在混凝土中的扩散能很好地吻合Fick第二定律;锂渣作为矿物掺合料替代水泥后能有效降低氯离子在混凝土中的扩散,当锂渣掺量为20%和30%时,混凝土氯离子扩散系数仅相当于空白试件的40%和37%。水灰比的降低能够显著降低混凝土氯离子扩散系数;随着侵蚀龄期的增大,氯离子扩散系数减小,且各龄期下掺入锂渣的混凝土氯离子扩散系数均比空白试件小。
The influence of lithium residue on the chloride ion erosion resistance of concrete was studied through experiments on concrete specimens with different water-cement ratio and lithium slag replacement rate under different erosion age and chloride salt concentration. The natural immersion method was used to study the diffusion and transport properties of chloride ions in saturated concrete. The core samples were sampled and delaminated to obtain the chloride ion concentrations at different depths according to the water-soluble chloride ion content determination method. The results show that the diffusion of chloride ions in concrete can well accord with Fick’s second law. Lithium slag as a mineral admixture can effectively reduce the chloride ion diffusion in concrete. When the content of lithium slag is 20% and At 30%, the chloride diffusion coefficient of concrete is only equivalent to 40% and 37% of the blank specimens. The decrease of water-cement ratio can significantly reduce the chloride ion diffusion coefficient of concrete. With the increase of erosion age, the chloride diffusion coefficient decreases, and the chloride diffusion coefficient of concrete mixed with lithium slag at each age is higher than that of blank specimen small.