掺合料复合掺加技术在高性能混凝土中的应用
发布时间：2018-08-09 20:47
【摘要】：以工程应用为背景,结合现场实际情况,在混凝土中复合掺加粉煤灰及矿粉,以期提高混凝土的工作性、强度、耐久性等若干性能,配制高性能混凝土。高性能混凝土由于具有良好的耐久性、工作性、强度和良好的体积稳定性等许多优良特性,被认为是目前全世界性能最为全面的混凝土,已广泛应用于在桥梁、高层建筑、海港建筑等工程中。本研究以正交设计方法安排试验,以掺合料混合比例及取代水泥量为研究因素,考核混凝土工作性及3d、28d、56d强度、混凝土耐久性等主要指标。以工程中应用的C30、C40、C50为研究对象,研究掺合料等量取代水泥后,混凝土工作性、强度及耐久性变化规律。选用为P.O 42.5水泥进行试验,测试分析混凝土的工作性和混凝土三个龄期的抗压强度。通过分析掺合料掺量及掺配比例对混凝土各龄期抗压强度与及工作性影响,总结出相应影响规律,在此基上确定了不同强度等级混凝土中掺合料的最佳掺配比例及掺量;对混凝土孔结构、电通量及抗冻性进行了研究。结果表明:粉煤灰与矿粉双掺比例为1:1.5,取代水泥量为20%时,混凝土各项性能指标良好,满足工程实际应用。
[Abstract]:With the background of engineering application and the actual situation in the field, fly ash and mineral powder are mixed in concrete to improve the workability, strength and durability of concrete and to prepare high performance concrete. Because of its good durability, workability, strength and volume stability, high performance concrete is considered to be the most comprehensive concrete in the world, and has been widely used in bridges and high-rise buildings. In the works of seaport construction, etc. In this study, the orthogonal design method is used to arrange the test, and the mixing ratio of admixtures and the quantity of cement substitute are taken as the research factors, and the workability of concrete, the strength of concrete at 28 days and 56 days, and the durability of concrete are examined. Taking C30C40C50 used in engineering as the research object, the variation law of workability, strength and durability of concrete after the equal replacement of cement with admixture is studied. The workability of concrete and the compressive strength of three ages of concrete were tested and analyzed by using P.O 42.5 cement. By analyzing the influence of admixture content and admixture ratio on the compressive strength and workability of concrete at different ages, the corresponding influence law is summarized, and the optimum admixture proportion and amount of admixture in concrete of different strength grades are determined on this basis. The pore structure, electric flux and frost resistance of concrete were studied. The results show that when the ratio of fly ash and mineral powder is 1: 1.5, and the cement is replaced by 20%, the performance of concrete is good and meets the practical application in engineering.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
本文编号：2175266
[Abstract]:With the background of engineering application and the actual situation in the field, fly ash and mineral powder are mixed in concrete to improve the workability, strength and durability of concrete and to prepare high performance concrete. Because of its good durability, workability, strength and volume stability, high performance concrete is considered to be the most comprehensive concrete in the world, and has been widely used in bridges and high-rise buildings. In the works of seaport construction, etc. In this study, the orthogonal design method is used to arrange the test, and the mixing ratio of admixtures and the quantity of cement substitute are taken as the research factors, and the workability of concrete, the strength of concrete at 28 days and 56 days, and the durability of concrete are examined. Taking C30C40C50 used in engineering as the research object, the variation law of workability, strength and durability of concrete after the equal replacement of cement with admixture is studied. The workability of concrete and the compressive strength of three ages of concrete were tested and analyzed by using P.O 42.5 cement. By analyzing the influence of admixture content and admixture ratio on the compressive strength and workability of concrete at different ages, the corresponding influence law is summarized, and the optimum admixture proportion and amount of admixture in concrete of different strength grades are determined on this basis. The pore structure, electric flux and frost resistance of concrete were studied. The results show that when the ratio of fly ash and mineral powder is 1: 1.5, and the cement is replaced by 20%, the performance of concrete is good and meets the practical application in engineering.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528
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