常用矿物掺合料对水泥基材料的性能影响研究

发布时间：2019-06-22 14:53

【摘要】：现如今,建筑行业已经成为我国国民经济发展的重要物质生产部门,它不仅与国家整体经济的发展息息相关,也和人民生活质量的改善有着密不可分的联系。在建筑行业领域中,水泥作为基本建设的主要原材料之一,具有极其突出的地位。由于它具有水化、凝结硬化快,强度高等特点而广泛应用于工业、国防、交通、水利等许多重要国家支柱产业。与此同时由于水泥在生产过程中带来的严重环境问题也成为阻碍经济发展的重要因素之一。另一方面,随着社会工业化的快速发展,产生了许多无法被环境所消化的工业废弃物,如粉煤灰、矿渣、硅灰、煤矸石等。这些工业废弃物由于技术、经济等问题无法被合理利用,造成不合理堆放,不仅占用大量土地,还严重污染环境。因此,如何通过合理的设计,把这些工业废弃物以矿物掺合料或水泥混合材的形式与水泥熟料有效的进行结合已成为各国学者亟待解决的问题。这样不仅可以减少水泥熟料的使用,减少水泥生产过程的环境污染问题,还可以把大量的工业废弃物有效地利用起来,走出一条可持续发展的道路。本文从胶凝材料的水化反应程度出发,通过对复合水泥浆体中胶凝材料的水化反应程度进行定性及定量测量,评定复合体系中矿物掺合料对体系所做的贡献。研究胶凝材料水化反应程度在不同配合比,不同养护龄期条件下的变化规律,并结合复合水泥浆体的干燥收缩率和抗压强度数据,寻找复合体系中各胶凝材料的最佳配比。本文分为三部分对矿物掺合料对体系所做的贡献进行研究,1)利用化学结合水法、选择性溶解法及计算机手段定性及定量的测量了水泥、粉煤灰-水泥二元体系、粉煤灰-硅灰-水泥三元体系中水泥和矿物掺合料的水化反应程度,并结合干燥收缩率和抗压强度的测量分析了养护龄期、配合比对化学结合水量、水化反应程度、干燥收缩、抗压强度的影响规律以及各性能之间的关系,寻找复合体系中各胶凝材料的最佳配比;2)利用化学结合水法、选择性溶解法及计算机手段定性及定量的测量了水泥、煤矸石-水泥二元体系、矿渣-水泥二元体系、煤矸石-矿渣-水泥三元体系中水泥、煤矸石、矿渣的水化反应程度,并结合干燥收缩率和抗压强度的测量分析了养护龄期、配合比对化学结合水量、水化反应程度、干燥收缩、抗压强度的影响规律以及各性能之间的关系,寻找复合体系中各胶凝材料的最佳配比;3)通过热分析的方法测量了水泥、粉煤灰-水泥二元体系、粉煤灰-硅灰-水泥三元体系中Ca(OH)2含量,以定性表征复合体系中胶凝材料的水化反应程度,并结合干燥收缩率和抗压强度数据,分析养护龄期、配合比对体系中Ca(OH)2含量、干燥收缩、抗压强度的影响规律以及各性能之间的关系,找寻最合理的配比。得出如下结论:1)综合考虑粉煤灰-水泥二元体系,粉煤灰-硅灰-水泥三元体系中水泥、矿物掺合料的水化反应程度,复合水泥基材料的干燥收缩率及抗压强度值,认为当复合水泥浆体中含有45%粉煤灰,5%硅灰时,复合材料的干燥收缩率较小,抗压强度较大,并且矿物掺合料的利用率最高。2)综合考虑煤矸石-水泥、矿渣-水泥二元体系,煤矸石-矿渣-水泥三元体系中水泥、煤矸石、矿渣的水化反应程度,复合水泥基材料的干燥收缩率以及抗压强度值,认为当复合水泥浆体中含有15%煤矸石,15%矿渣时,复合材料的干燥收缩率较小,抗压强度较大,并且煤矸石和矿渣的利用率最高。3)综合考虑粉煤灰-水泥二元体系、粉煤灰-硅灰-水泥三元体系中的Ca(OH)2含量,复合水泥基材料的干燥收缩率以及抗压强度值,认为当复合水泥浆体中含有30%粉煤灰,10%硅灰时,复合材料的干燥收缩率较小,抗压强度较大。
[Abstract]:Now, the construction industry has become an important material production department of the national economic development of our country, it is closely related not only to the development of the whole country economy, but also to the improvement of the quality of the people's life. In the construction industry, cement is one of the main raw materials of the capital construction, and has an outstanding position. It is widely used in many important national pillar industries such as industry, national defense, transportation and water conservancy because it has the characteristics of hydration, condensation and hardening, high strength and so on. At the same time, the serious environmental problems caused by the cement in the production process also become one of the important factors that hinder the economic development. On the other hand, with the rapid development of the social industrialization, many industrial wastes that cannot be digested by the environment, such as fly ash, slag, silica fume, coal and stone, etc. are produced. The industrial wastes cannot be reasonably utilized due to the problems of technology, economy and the like, thus not only occupying a large amount of land, but also seriously polluting the environment. Therefore, how to effectively combine these industrial wastes with cement clinker in the form of mineral admixture or cement admixture has become a problem to be solved by national scholars through reasonable design. So that the use of the cement clinker can be reduced, the environmental pollution of the cement production process is reduced, and a large amount of industrial wastes can be effectively utilized to walk out of a sustainable development road. In this paper, from the degree of hydration reaction of the gelled material, the contribution of the mineral admixture in the composite system to the system is assessed by the qualitative and quantitative measurement of the degree of hydration reaction of the cementing material in the composite cement paste. The change law of the degree of hydration reaction of the gelled material under the conditions of different compounding ratio and different curing age is studied, and the optimum ratio of each cementing material in the composite system is found by combining the drying shrinkage and the compressive strength data of the composite cement paste. This paper is divided into three parts to study the contribution of mineral admixture to the system.1) The binary system of cement and fly ash-cement is measured by chemical combination water method, selective dissolution method and computer means. the hydration reaction degree of the cement and the mineral admixture in the fly ash-silica fume-cement ternary system is analyzed, the curing age is analyzed in combination with the measurement of the drying shrinkage and the compressive strength, the influence rule of the compressive strength and the relationship between the performances are used to find the optimal proportion of each cementing material in the composite system;2) the binary system of the cement and the coal-fired stone-cement is measured qualitatively and quantitatively by the chemical combination water method, the selective dissolution method and the computer means, The hydration reaction degree of cement, coal, stone and slag in the slag-cement binary system, the coal-fired stone-slag-cement ternary system is analyzed, the curing age is analyzed by combining the measurement of the drying shrinkage and the compressive strength, the influence rule of the compressive strength and the relationship between the performances are used to find the optimal ratio of each cementing material in the composite system; and 3) the content of the Ca (OH)2 in the cement, the fly ash-cement binary system, the fly ash-silicon ash-cement ternary system is measured by the method of thermal analysis, In this paper, the hydration degree of the gelled material in the composite system was qualitatively characterized, and the drying shrinkage and the compressive strength data were combined to analyze the effect of the curing age and the matching ratio on the content of Ca (OH)2, the dry shrinkage and the compressive strength of the system, and the relationship between the properties. The following conclusions are drawn:1) comprehensively considering the hydration reaction degree of cement and mineral admixture in the fly ash-cement binary system, the fly ash-silicon ash-cement ternary system, the drying shrinkage and the compressive strength value of the composite cement-based material, It is considered that when the composite cement paste contains 45% of fly ash and 5% silica fume, the drying shrinkage of the composite material is small, the compressive strength is large, and the utilization ratio of the mineral admixture is the most. The hydration degree of the cement, the coal-fired stone and the slag in the coal-fired stone-slag-cement ternary system, the drying shrinkage and the compressive strength value of the composite cement-based material are considered to be small when the composite cement paste contains 15% of the coal and 15% of the slag, and 3) comprehensively considering the Ca (OH)2 content in the fly ash-cement binary system, the fly ash-silicon ash-cement ternary system, the drying shrinkage and the compressive strength value of the composite cement-based material, It is considered that when the composite cement paste contains 30% fly ash and 10% silica fume, the drying shrinkage of the composite material is small and the compressive strength is large.
【学位授予单位】：安徽建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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