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本文研究了水胶比、矿物掺合料和侵蚀性溶液组成等因素对混凝土抗硫酸盐侵蚀性能的影响。试验结果表明:降低水胶比可以增强混凝土抗Na_2SO_4溶液侵蚀的能力,而且水胶比越低,混凝土耐久性对侵蚀性条件变化的敏感性越小;掺入粉煤灰可以在后期改善混凝土抗硫酸盐侵蚀的性能,而且当掺量不超过50%时,提高粉煤灰的掺量对改善混凝土的抗硫酸盐侵蚀性能是有利的;在15%Na_2SO_4溶液侵蚀条件下,掺入20%的矿渣可以改善混凝土的抗硫酸盐侵蚀性能,但掺量过大时在后期对混凝土抵抗硫酸盐侵蚀不利。镁离子的存在会加剧硫酸根对混凝土的侵蚀,而在Na_2SO_4溶液中加入氯盐并不会加剧侵蚀性溶液对混凝土的劣化作用。
In this paper, the effects of water-binder ratio, mineral admixtures and composition of aggressive solution on the sulfate resistance of concrete were studied. The results show that: reducing the water-cement ratio can enhance the ability of concrete to resist the corrosion of Na_2SO_4 solution, and the lower the water-cement ratio, the less susceptible to changes in aggressiveness of concrete durability; the incorporation of fly ash can improve the concrete resistance Sulphate erosion. When the content of fly ash is not more than 50%, it is beneficial to improve the sulphate corrosion resistance of concrete. In the condition of 15% Na_2SO_4 solution erosion, 20% Slag can improve the sulfate resistance of concrete, but when the content is too large, it will adversely affect the resistance of concrete to sulfate attack. The existence of magnesium ions will aggravate the erosion of concrete by sulfate. However, the addition of chloride salt to Na_2SO_4 solution will not aggravate the deterioration of concrete by aggressive solution.