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Surface Chloride Concentration of Concrete under Shallow Immersion Conditions

机译:浅埋条件下混凝土的表面氯化物浓度

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摘要

Deposition of chloride ions in the surface layer of concrete is investigated in this study. In real concrete structure, chloride ions from the service environment can penetrate into concrete and deposit in the surface layer, to form the boundary condition for further diffusion towards the interior. The deposit amount of chloride ions in the surface layer is normally a function of time, rather than a constant. In the experimental investigation, concrete specimens with different mix proportions are immersed in NaCl solution with a mass concentration of 5%, to simulate the shallow immersion condition in sea water, and the surface chloride concentrations are measured at different ages. It is found that the surface chloride concentration increases following the increasing immersion durations, and varies from a weight percentage of 0.161%–0.781% in concretes with different mix proportions. The w/c (water-to-cement ratio) influences the surface chloride concentration significantly, and the higher the w/c is, the higher the surface chloride concentration will be, at the same age. However, following the prolonging of immersion duration, the difference in surface chloride concentration induced by w/c becomes smaller and smaller. The incorporation of fly ash leads to higher surface chloride concentration. The phenomena are explained based on pore structure analyses.
机译:在这项研究中研究了氯离子在混凝土表层的沉积。在实际的混凝土结构中,使用环境中的氯离子会渗透到混凝土中并沉积在表层,从而形成边界条件,进一步向内部扩散。在表面层中氯离子​​的沉积量通常是时间的函数,而不是常数。在实验研究中,将具有不同混合比例的混凝土试样浸入质量浓度为5%的NaCl溶液中,以模拟海水中的浅浸条件,并测量不同年龄的表面氯化物浓度。研究发现,随着浸泡时间的延长,表面氯化物的浓度也随之增加,在不同混合比的混凝土中,其表面氯化物的重量百分比在0.161%–0.781%之间变化。 w / c(水灰比)显着影响表面氯化物浓度,并且w / c越高,在相同的年龄下表面氯化物浓度越高。然而,随着浸泡时间的延长,由w / c引起的表面氯化物浓度的差异变得越来越小。粉煤灰的掺入导致较高的表面氯化物浓度。该现象是根据孔隙结构分析来解释的。

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