自燃煤矸石—矿渣—粉煤灰地质聚合物的制备及性能研究

发布时间：2018-05-13 08:39

  本文选题：自然煤矸石 + 矿渣　； 参考：《辽宁工程技术大学》2013年硕士论文

【摘要】：煤矸石以铝硅酸盐矿物和碳为主要成分，它的“质”—富含氧化硅和氧化铝，以及“量”—大宗性，决定了煤矸石与建筑材料的“质”和“量”上的双重近似性，也决定了煤矸石在水泥领域资源化利用的可行性。本文是国家自然科学基金煤炭联合项目《煤矸石在水泥和混凝土资源化利用中关键科学问题研究》（U1261122）的子项目，所有研究成果都是在该基金的资助下完成并取得的。 本文以自燃煤矸石、粉煤灰和矿渣为主要原料在碱性激活剂作用下，采用适当工艺制备地质聚合物。首先利用正交试验，考察自燃煤矸石掺量、粉煤灰掺量和激发剂水玻璃掺量三个因素对地质聚合物胶砂强度的影响。通过对正交试验结果的极差、方差分析，优化配合比参数。在此基础上对最优配合比进行胶凝材料其他主要技术性能检测，包括细度、凝结时间、体积安定性和水化热等项目。主要研究成果如下： （1）自燃煤矸石-矿渣-粉煤灰地质聚合物在水胶比为0.46，试件脱模后在65℃环境下蒸养6h的条件下，以最佳配合比（自燃煤矸石：矿渣：粉煤灰=2:1:1，激发剂配体中水玻璃：氢氧化钾=7:3，激发剂掺量为10.5%）成型的试件，3d、28d胶砂抗折强度分别为5.3MPa、7.2MPa，抗压强度分别为37.9MPa和42.73MPa，达到了硅酸盐水泥42.5强度等级的要求； （2）对于自燃煤矸石-矿渣-粉煤灰地质聚合物，各因素影响胶砂强度程度大小顺序为：煤矸石掺量矿渣掺量（或粉煤灰掺量）水玻璃掺量； （3）在复合激发剂配体中碱的浓度一定要适中，碱的浓度过高，不仅造成自燃煤矸石-矿渣-粉煤灰地质聚合物的成本提高，且随着龄期延长无论是胶砂的抗折强度，还是抗压强度都会出现强度倒缩现象，这一点需要引起高度重视； （4）自燃煤矸石-矿渣-粉煤灰地质聚合物的细度、凝结时间、体积安定性等技术性能指标都满足GB175-1999国家标准，，且表现出终凝时间相对较短、水化热底等技术特性。
[Abstract]:Coal gangue is mainly composed of aluminosilicate minerals and carbon. Its "quality", which is rich in silica and alumina, and "quantity", determines the "quality" and "quantity" of coal gangue and building materials. It also determines the feasibility of the utilization of coal gangue in cement field. This paper is a sub-project of the National Natural Science Foundation coal joint project < Research on key Scientific problems of Coal gangue in cement and concrete Recycling Utilization "U1261122). All the research results have been completed and obtained with the aid of the fund. In this paper, geopolymers were prepared by using spontaneous combustion gangue, fly ash and slag as main raw materials under the action of alkaline activator. Firstly, the effects of the content of spontaneous combustion gangue, fly ash and water glass on the strength of geopolymer cement sand were investigated by orthogonal test. The parameters of mixture ratio were optimized by the analysis of variance and range of orthogonal test results. On this basis, other main technical properties of cementitious materials were tested, including fineness, setting time, volume stability and hydration heat. The main findings are as follows: (1) spontaneous combustion coal gangue, slag and fly ash geopolymers with water / binder ratio of 0.46, the samples were steamed and stored at 65 鈩

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