混凝土路面修补用聚合物改性碱式硫酸镁水泥路用性能

发布时间：2018-01-09 12:14

本文关键词：混凝土路面修补用聚合物改性碱式硫酸镁水泥路用性能　出处：《哈尔滨理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国经济快速发展之后建筑行业的主要任务将转向对现有设施的修补、翻新和维护。水泥混凝土路面作为主要路面结构形式之一,对其修补材料的研究将是路面修补行业长远发展以及实现可持续发展所必须的。碱式硫酸镁水泥具有原材料来源丰富、功能广泛、可再生利用、节能减排、性能优良等优点,是一种新型的生态材料。本研究以碱式硫酸镁水泥为基材,通过掺入聚合物乳液对水泥进行改性,制备出性能优越适用于路面裂缝修补的水泥基材料,主要研究内容与结论如下:首先,以流动度、可灌性、标准条件下养护7天的抗压强度为指标,通过正交试验,确定了碱式硫酸镁水泥各组成材料的理论最优掺量和聚合物的种类,基于以上正交试验设计及结果分析,优化了聚合物改性碱式硫酸镁水泥基路面裂缝修补材料的初始配合比。其次,全面系统的研究了两种选定配合比碱式硫酸镁水泥基路面修补材料的工作性能、力学性能、收缩性能、粘结性能和耐腐蚀性能,对比分析了不同聚合物掺量、MgO:MgSO_4:H_2O摩尔比和龄期对各性能的影响规律。试验结果表明聚合物的掺入提高了碱式硫酸镁水泥的粘度,表现出了较好的流动性,满足路面裂缝修补的工艺性能,同时聚合物还改善了水泥的韧性、收缩性、耐腐蚀性及其与旧水泥混凝土路面的粘结性。最后,选取具有代表性的聚合物改性碱式硫酸镁水泥样品进行显微结构分析,提出了聚合物改善碱式硫酸镁水泥基修补材料路用性能的机理。
[Abstract]:After the rapid development of Chinese economy, the main task of the construction industry will be to repair, renovate and maintain the existing facilities. Cement concrete pavement is one of the main pavement structure forms. The research of repair materials will be necessary for the long-term development and sustainable development of pavement repair industry. Basic magnesium sulfate cement has rich raw materials, wide function, renewable use, energy saving and emission reduction. The basic magnesium sulfate cement was used as the base material, and the cement was modified by adding polymer emulsion. The main research contents and conclusions are as follows: firstly, the flowability, irrigability and compressive strength of 7 days maintenance under standard conditions are taken as indicators. Through the orthogonal test, the theoretical optimum content of basic magnesium sulfate cement and the kinds of polymers were determined. Based on the above orthogonal test design and analysis of the results. The initial mix ratio of polymer modified basic magnesium sulfate cement based pavement crack repair materials is optimized. Secondly, the working performance of two kinds of selected basic magnesium sulfate cement based pavement repair materials are studied comprehensively and systematically. The mechanical properties, shrinkage properties, bond properties and corrosion resistance were compared and analyzed. The effect of MgO:MgSO_4:H_2O molar ratio and age on the properties. The experimental results showed that the viscosity of basic magnesium sulfate cement was increased with the addition of polymer, and the fluidity of the cement was better. At the same time, the polymer also improves the toughness, shrinkage, corrosion resistance of cement and its bond with the old cement concrete pavement. The microstructure of the representative polymer modified basic magnesium sulfate cement was analyzed and the mechanism of improving the road performance of the basic magnesium sulfate cement repair material was put forward.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ172.7

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