硅灰和聚合物乳液对钢纤维混凝土的耐久性影响

发布时间：2018-04-13 04:32

本文选题：钢纤维混凝土 + 硅灰　；参考：《重庆交通大学》2015年硕士论文

【摘要】：本文作者将硅灰和聚合物乳液掺加到钢纤维混凝土中,硅灰和聚合物乳液掺量均为3%、6%、9%、12%,钢纤维掺量为0.6%、0.9%、1.2%,在基准混凝土配合比相同的情况下,进行了28d基本力学性能试验、抗冻试验、碳化试验、抗硫酸盐侵蚀试验以及微观结构表征试验。首先测试了掺硅灰和聚合物乳液的钢纤维混凝土工作性能,硅灰和聚合物乳液使钢纤维混凝土工作性能良好。硅灰使钢纤维混凝土坍落度降低,随着硅灰掺量的增加,其棍度偏向中级;聚合物乳液使钢纤维混凝土塌落度增加,随着聚合物乳液掺量的增加,其棍度偏向上级;其次研究了钢纤维硅灰混凝土和钢纤维聚合物混凝土的基本力学性能。在复掺12%硅灰+1.2%钢纤维时,混凝土的抗压强度、劈裂抗拉强度、抗折强度达到最大,复掺硅灰的钢纤维混凝土效果要优于复掺聚合物乳液的;研究了硅灰和聚合物乳液对钢纤维混凝土的耐久性能影响,硅灰对钢纤维混凝土抗冻性能提升效果较明显,而复掺聚合物乳液钢纤维混凝土抗冻性提升效果要优于复掺硅灰的;碳化试验指出复掺12%聚合物乳液+0.9钢纤维的混凝土碳化深度比0.9%钢纤维混凝土的低28.3%,抗碳化效果优于复掺12%硅灰的钢纤维混凝土;抗硫酸盐侵蚀试验结果得出硅灰比聚合物乳液使钢纤维混凝土长期抵抗硫酸钠的腐蚀能力更明显。复掺12%硅灰+1.2%钢纤维的混凝土抗硫酸钠侵蚀性能最明显,相比普通混凝土提升了31.4%,而复掺相同比例的聚合物乳液和钢纤维的混凝土抗硫酸钠侵蚀性能仅提升20%。研究了硅灰和聚合物乳液对钢纤维混凝土微观结构的影响。微观表征试验结果显示硅灰使钢纤维混凝土内部孔隙结构细化,细化效果要明显优于聚合物乳液。
[Abstract]:The author adds silica fume and polymer emulsion to steel fiber concrete, the content of silica fume and polymer emulsion are both 3 / 6 / 99 / 1212, and the amount of steel fiber is 0.6 / 0.9 / 1.2. The basic mechanical properties of the concrete are tested for 28 days under the same mix ratio of the reference concrete.Freezing resistance test, carbonation test, sulfate corrosion resistance test and microstructure characterization test.The performance of steel fiber reinforced concrete (SFRC) mixed with silica fume and polymer emulsion was first tested, and the working performance of SFRC was improved by silica fume and polymer emulsion.Silica fume decreases the slump of SFRC, and with the increase of the content of silica fume, the stick degree of SFRC increases with the increase of the content of silica fume, and the stick degree of SFRC increases with the increase of the content of polymer emulsion, and the stick degree of SFRC increases with the increase of the content of polymer emulsion.Secondly, the basic mechanical properties of steel fiber silica fume concrete and steel fiber polymer concrete are studied.When 12% silica fume is mixed with 1.2% steel fiber, the compressive strength, splitting tensile strength and flexural strength of concrete are maximum, and the effect of steel fiber reinforced concrete mixed with silica fume is better than that of polymer emulsion.The effects of silica fume and polymer emulsion on the durability of steel fiber reinforced concrete are studied. The effect of silica fume on the frost resistance of steel fiber reinforced concrete is obvious, but the effect of composite polymer emulsion steel fiber reinforced concrete is better than that of composite silica fume.The carbonization test shows that the carbonation depth of the concrete mixed with 12% polymer emulsion 0.9 steel fiber is lower than that of 0.9% steel fiber concrete, and the carbonation resistance is better than that of the steel fiber concrete with 12% silica fume.The results of sulfate-resistance test show that the corrosion resistance of SFRC is more obvious than that of polymer emulsion.The corrosion resistance of concrete mixed with 12% silica fume 1.2% steel fiber is the most obvious, which is 31.444% higher than that of ordinary concrete, but the corrosion resistance of concrete mixed with the same proportion of polymer emulsion and steel fiber is only 20%.The effect of silica fume and polymer emulsion on the microstructure of steel fiber reinforced concrete (SFRC) was studied.The results of microscopic characterization test show that silica fume refines the pore structure of steel fiber reinforced concrete, and the fining effect is obviously better than that of polymer emulsion.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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