秸秆菱镁混凝土耐水性能试验研究

发布时间：2018-01-02 21:23

本文关键词：秸秆菱镁混凝土耐水性能试验研究　出处：《山东农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国经济飞速发展,人口不断增长,人民生活水平日新月异,能源、资源消耗量日益增加,而煤、石油、天然气等传统能源日渐枯竭,更制约了我国经济和社会发展。传统建筑行业属高耗能、高污染行业,“十三五”规划以来国家提出淘汰落后产能,对传统建筑材料提出了新的要求:原材料储量丰富且易于开采,生产耗能少,污染小;加工成品密度小,质量轻,保温隔热,耐久性优异。菱镁材料储量丰富,便于开采,生产过程能耗低,污染小;菱镁制品密度小,强度高,保温隔热性能优异。本文主要以课题组所研制的新型秸秆菱镁混凝土材料耐水性能为研究对象,以软化系数、吸水率、强度衰减速率和截面侵蚀面积作为秸秆菱镁混凝土耐水性能评价指标,从宏观上测定其耐水性能;然后通过添加菱镁水泥改性剂的方式测定菱镁水泥改性剂对秸秆菱镁混凝土耐水性的影响,为其进一步的应用研究提供理论依据和数据支持。首先,通过查阅对菱镁水泥相关研究文献,总结了我国菱镁材料的生产和应用现状,菱镁制品优点和缺陷,菱镁水泥反应的反应过程和反应机理和菱镁水泥改性措施。将软化系数、吸水率、强度衰减速率和截面侵蚀面积作为秸秆菱镁混凝土耐水性能评价指标。确定偶联剂、消泡剂、抗反卤剂和缓凝剂为秸秆菱镁混凝土改性剂,并确定其掺量范围。其次,通过试验测定普通秸秆菱镁混凝土和掺入偶联剂的秸秆菱镁混凝土抗压强度和耐水性能,得出秸秆菱镁混凝土中偶联剂最佳掺入量和偶联剂对秸秆菱镁混凝土耐水性能的影响。将消泡剂、缓凝剂与抗反卤剂三种试剂组成复合改性剂,并根据三种外加剂的掺量设计正交试验,通过正交试验测试三种外加剂对秸秆菱镁混凝土耐水性能的影响顺序,并测定三种外加剂的最优掺量。最后,针对试验过程中秸秆菱镁混凝土出现的吸潮、反卤和泛霜现象的产生机理并结合相关理论研究,进行分析,根据菱镁水泥发生吸潮、反卤和泛霜的机理,提出改善秸秆菱镁混凝土吸潮、反卤及泛霜现象的措施,提高其工程应用中的表现。根据本试验对秸秆菱镁混凝土抗压强度和耐水性能的研究,通过掺入菱镁水泥改性剂改善秸秆菱镁混凝土耐水性能具有十分明显的作用。通过对秸秆菱镁混凝土抗压强度和耐水性能的研究,为课题组未来秸秆菱镁混凝土的应用研究提供了理论依据。
[Abstract]:China's rapid economic development, population growth, people's living standards with each passing day, energy, resource consumption is increasing, and coal, oil, natural gas and other traditional energy sources are increasingly depleted. The traditional construction industry is of high energy consumption and high pollution. Since the 13th Five-Year Plan, the country has proposed to eliminate backward production capacity. New requirements for traditional building materials are put forward: abundant reserves of raw materials, easy mining, less energy consumption and less pollution; The finished product has small density, light weight, heat preservation and heat insulation, excellent durability, rich magnesite material reserves, easy mining, low energy consumption and low pollution in the production process. Magnesium magnesite products have low density, high strength and excellent thermal insulation. In this paper, the water resistance of the new straw magnesia concrete material developed by the research group is the research object, with softening coefficient and water absorption rate as the research object. The attenuation rate of strength and the area of cross section erosion are used to evaluate the water resistance of straw magnesite concrete, and the water resistance of straw magnesite concrete is measured macroscopically. Then the effect of magnesite cement modifier on water resistance of straw magnesite concrete was determined by adding magnesite cement modifier to provide theoretical basis and data support for its further application research. Through consulting the related research documents of magnesite cement, the production and application status of magnesite in China, the advantages and disadvantages of magnesite products are summarized. Reaction process and reaction mechanism of magnesite cement reaction and modification measures of magnesite cement. Strength attenuation rate and cross section erosion area are used as indicators of water resistance of straw magnesite concrete. Coupling agent, defoamer, anti-halogen agent and retarder are used as modifiers for straw magnesite concrete. Secondly, the compressive strength and water resistance of ordinary straw magnesite concrete and straw magnesite concrete mixed with coupling agent were determined. The effect of coupling agent and coupling agent on water resistance of straw magnesite concrete was obtained. The compound modifier was composed of defoamer retarder and anti-halogen agent. According to the content of three admixture design orthogonal test, through the orthogonal test to test the three admixtures on the water resistance of straw magnesite concrete, and determine the optimal content of the three admixtures. Finally. According to the mechanism of moisture absorption, reverse halogen and frosting of straw magnesite concrete in the process of test and combining with relevant theoretical research, the mechanism of moisture absorption, reverse halogen and frosting of magnesium magnesite cement is analyzed according to the mechanism of moisture absorption, reverse halogen and frosting of magnesite cement. The measures to improve moisture absorption, reverse halogen and frosting phenomenon of straw magnesite concrete are put forward to improve its performance in engineering application. According to this experiment, the compressive strength and water resistance of straw magnesite concrete are studied. It is very important to improve the water resistance of straw magnesite concrete by adding magnesite cement modifier. The compressive strength and water resistance of straw magnesite concrete are studied. It provides the theoretical basis for the future application research of straw magnesite concrete.
【学位授予单位】：山东农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

【参考文献】