粘土矿物组成对聚羧酸减水剂分散性能的影响

发布时间：2018-03-06 13:06

本文选题：粘土矿物组成　切入点：分散性　出处：《重庆大学》2015年硕士论文　论文类型：学位论文

【摘要】：工程应用中,集料附含泥会降低聚羧酸减水剂的减水分散性能,其中,集料附含粘土是泥中对聚羧酸减水剂分散性产生负面影响的最显著的组分。粘土吸附聚羧酸减水剂使得对水泥起分散作用的有效聚羧酸减水剂量减少和粘土吸附拌合水使得提供浆体流动的自由水减少是粘土影响掺聚羧酸减水剂水泥净浆、砂浆和混凝土工作性能的主要原因,其中不同种类的粘土对聚羧酸减水剂分散性的影响程度存在较大差异。目前针对集料附含泥对聚羧酸减水剂负效应的研究大多集中于不同地区的泥或是不同粒径的泥对掺聚羧酸减水剂混凝土工作性能或力学性能的影响,缺少对粘土负面影响的系统分析,不能得到一种普适用的结论。本文则从单矿物粘土和模拟粘土的角度出发,重点研究了泥中所含的主要的粘土矿物对聚羧酸减水剂分散性能的影响。基于对文献资料的统计分析,选取蒙脱土(钠基)、伊利土、高岭土三种单矿物粘土作为基本的研究对象,制备了四个区域的模拟粘土。依据不同种类单矿物粘土及不同区域模拟粘土的掺聚羧酸减水剂水泥净浆流动度试验,研究了粘土矿物组成对聚羧酸减水剂分散性的影响规律,结果表明粘土矿物组成中的蒙脱土对聚羧酸减水剂产生的负面效应最为显著,模拟粘土中蒙脱土的含量多少、伊利土和高岭土含量的相对变化,导致其对两种聚羧酸减水剂的负面影响也存在差异,其中蒙脱土的含量是模拟粘土影响聚羧酸减水剂分散性的主导因素。从单矿物粘土、模拟粘土对水和聚羧酸减水剂的吸附量的角度探究了粘土矿物的吸附性特征,希望可以通过补偿减水剂的方法,消除粘土矿物对聚羧酸减水剂性能的负面影响。结果表明,蒙脱土的吸水性和对聚羧酸减水剂的吸附量远远大于其他单矿物粘土,蒙脱土含量大的西南和华中区域的模拟粘土,其吸水性能强,但其吸附聚羧酸减水剂的能力却不如蒙脱土含量少的东北和华东区域的模拟粘土。工程应用中不可以采用补偿水的方法消除粘土矿物的负效应,采用补偿减水剂消除粘土矿物负效应前应该结合工程的成本目标。利用SPSS软件,采用回归分析的方法,通过三种单矿物粘土及四种模拟粘土对掺聚羧酸减水剂水泥净浆流动度的负面影响及其吸附性的线性回归分析,得出了相应的回归方程,用以分析预测粘土矿物组成对聚羧酸减水剂的负面影响程度。
[Abstract]:In engineering applications, the addition of mud to aggregates will reduce the water-reducing dispersion of polycarboxylic acid superplasticizers. Clay containing aggregate is the most significant component of mud that has a negative effect on the dispersity of polycarboxylic acid water reducer. Clay adsorption of polycarboxylic acid water reducer reduces the amount of effective polycarboxylic acid water reducer which disperses cement and the adsorption of clay. Mixing water reduces the free water that provides the flow of the slurry. It is the clay that affects the cement paste mixed with polycarboxylic acid water reducer. The main reasons for the working performance of mortar and concrete, The influence of different kinds of clay on the dispersion of polycarboxylic acid superplasticizer is quite different. At present, the research on the negative effect of aggregate with mud on polycarboxylate water reducer is mainly focused on the different areas of mud or different particle size. The effect of polycarboxylic acid superplasticizer on the working or mechanical properties of concrete with polycarboxylic acid superplasticizer, In the absence of systematic analysis of the negative effects on clay, a general and applicable conclusion can not be obtained. In this paper, a single mineral clay and a simulated clay are considered. The influence of the main clay minerals in the mud on the dispersion properties of polycarboxylic acid superplasticizer was studied. Based on the statistical analysis of the literature, montmorillonite (sodium base, Illite) was selected. Three kinds of single mineral clay of kaolin were used as the basic object of study, and four regions of simulated clay were prepared. The fluidity of cement paste mixed with polycarboxylic acid water reducer was tested according to different types of single mineral clay and different regions of simulated clay. The influence of clay mineral composition on dispersion of polycarboxylic acid water reducer was studied. The results showed that montmorillonite in clay mineral composition had the most significant negative effect on polycarboxylate water reducer, and the content of montmorillonite in simulated clay was the most significant. The relative changes of the contents of Illite and kaolin lead to the difference of their negative effects on the two kinds of polycarboxylic acid superplasticizer. The content of montmorillonite is the main factor that simulates the clay to influence the dispersion of polycarboxylate water reducer. The adsorption characteristics of clay minerals were studied by simulating the adsorption capacity of water and polycarboxylic acid superplasticizer. It was hoped that the negative effects of clay minerals on the properties of polycarboxylic acid superplasticizers could be eliminated by compensating the water reducers. The water absorption of montmorillonite and the adsorption of polycarboxylic acid water reducer are much larger than those of other monomtmorillonite clay. The simulated clay with high montmorillonite content in southwest and central China has strong water absorption property. However, its ability to adsorb polycarboxylic acid water reducer is not as good as the simulated clay in Northeast and East China, where the content of montmorillonite is less than that of montmorillonite. The method of compensating water can not be used to eliminate the negative effect of clay minerals in engineering application. The cost target of the project should be combined with the compensation water reducer before eliminating the negative effects of clay minerals. By using SPSS software, the method of regression analysis is used. Based on the linear regression analysis of the negative effects of three kinds of single mineral clay and four kinds of simulated clay on the fluidity of cement paste mixed with polycarboxylic acid superplasticizer, the corresponding regression equation is obtained. It is used to analyze and predict the negative influence of clay mineral composition on polycarboxylic acid water reducer.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.042.2

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