自燃煤矸石—矿渣—粉煤灰地质聚合物配体优化研究
发布时间：2018-10-15 10:38
【摘要】：地质聚合物作为一种新型绿色胶凝材料，由于其具有强度高、硬化快、耐酸碱腐蚀、耐高温等诸多特性，且多种富含活性硅铝成分的固体废弃物，如矿渣、粉煤灰和煤矸石等均可作为地质聚合物的主要原料，实现“灰色”水泥向“绿色”的转变，因此备受关注，已经成为研究热点。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。 本文以大宗固体废弃物煤矸石、矿渣和粉煤灰为主要原材料，采用碱激活的方式制备地质聚合物，重点研究碱激活配体的优化。首先进行激发剂品种、激发剂掺量和水玻璃模数三因素、四水平的正交试验，研究三因素对自燃煤矸石-矿渣-粉煤灰地质聚合物胶砂强度的影响及规律，以此确定激发剂品种、水玻璃模数以及较优的配体参数取值范围；然后利用二次响应曲面中的中心组合设计以水玻璃模数和配体掺量为变量，实现自燃煤矸石-矿渣-粉煤灰地质聚合物配体的最优化，并建立胶砂强度与水玻璃模数和配体掺量的回归方程；最后对最优配合比进行细度、凝结时间、体积安定性及水化热等主要技术性质的检测。具体研究内容和结果如下: (1)正交试验结果表明：自燃煤矸石-矿渣-粉煤灰地质聚合物最优的配合比为水玻璃模数为1.0，，配体掺量20%(占胶凝材料)。激发剂品种对自燃煤矸石-矿渣-粉煤灰地质聚合物胶砂强度影响最大，水玻璃模数和配体掺量对胶砂强度的影响也比较显著。配体掺量对地质聚合物的工作性影响最大。 (2)二次响应曲面试验表明：自燃煤矸石-矿渣-粉煤灰地质聚合物胶砂强度随着水玻璃模数的降低而提高，随着配体掺量的增加而增加。当水玻璃模数为1.0、配体掺量为20%时，胶砂28d抗折强度达到7.55MPa、抗压强度达到56.52MPa。但是当水玻璃模数低于1.0时会出现不溶性沉淀物，所以水玻璃模数不能低于1.0。配体掺量超过20%时胶砂明显粘稠，不利满足施工对拌合物的工作性要求。 (3)其他技术性能测定结果显示：自燃煤矸石-矿渣-粉煤灰地质聚合物各项指标皆符合GB175-1999的国家标准。
[Abstract]:Geopolymer, as a new green cementing material, has many characteristics such as high strength, fast hardening, acid and alkali corrosion resistance, high temperature resistance, and many kinds of solid wastes, such as slag, which are rich in active silicon and aluminum. Fly ash and coal gangue can be used as the main raw materials of geopolymers to realize the transformation from "grey" cement to "green". 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 this fund. In this paper, geopolymers were prepared by alkali activation using solid waste coal gangue, slag and fly ash as main raw materials, and the optimization of alkali activated ligands was emphasized. Firstly, the influence of three factors on the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand was studied by orthogonal test of three factors, such as the variety of activator, the amount of activator and the modulus of sodium silicate. In order to determine the range of activator, water glass modulus and the optimal ligand parameters, and then use the center combination in the quadratic response surface to design the water glass modulus and ligand content as variables, The optimum ligands of spontaneous combustion coal gangue, slag and fly ash geopolymer were optimized, and the regression equation of cement sand strength, water glass modulus and ligand content was established. Volume stability, hydration heat and other main technical properties of the detection. The specific research contents and results are as follows: (1) the orthogonal test results show that the optimum mixture ratio of spontaneous combustion gangue, slag and fly ash geopolymers is water glass modulus 1.0 and ligand content 20% (cementitious material). The type of activator has the greatest influence on the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand, and the influence of water glass modulus and ligand content on the strength of cement sand is also significant. The effect of ligand content on the workability of geopolymers is the greatest. (2) Quadric response surface test shows that the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand increases with the decrease of water glass modulus. The content of ligand increased with the increase of ligand content. When the modulus of sodium silicate is 1.0 and the content of ligand is 20, the flexural strength and compressive strength of cemented sand reach 7.55 MPA and 56.52 MPA respectively. However, insoluble precipitates occur when the water glass modulus is less than 1.0, so the water glass modulus should not be lower than 1.0. When the content of ligands exceeds 20, the cement sand is obviously viscous, (3) other technical performance measurement results show that all the indexes of spontaneous combustion gangue, slag and fly ash geopolymer accord with the national standard of GB175-1999.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU52
本文编号：2272285
[Abstract]:Geopolymer, as a new green cementing material, has many characteristics such as high strength, fast hardening, acid and alkali corrosion resistance, high temperature resistance, and many kinds of solid wastes, such as slag, which are rich in active silicon and aluminum. Fly ash and coal gangue can be used as the main raw materials of geopolymers to realize the transformation from "grey" cement to "green". 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 this fund. In this paper, geopolymers were prepared by alkali activation using solid waste coal gangue, slag and fly ash as main raw materials, and the optimization of alkali activated ligands was emphasized. Firstly, the influence of three factors on the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand was studied by orthogonal test of three factors, such as the variety of activator, the amount of activator and the modulus of sodium silicate. In order to determine the range of activator, water glass modulus and the optimal ligand parameters, and then use the center combination in the quadratic response surface to design the water glass modulus and ligand content as variables, The optimum ligands of spontaneous combustion coal gangue, slag and fly ash geopolymer were optimized, and the regression equation of cement sand strength, water glass modulus and ligand content was established. Volume stability, hydration heat and other main technical properties of the detection. The specific research contents and results are as follows: (1) the orthogonal test results show that the optimum mixture ratio of spontaneous combustion gangue, slag and fly ash geopolymers is water glass modulus 1.0 and ligand content 20% (cementitious material). The type of activator has the greatest influence on the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand, and the influence of water glass modulus and ligand content on the strength of cement sand is also significant. The effect of ligand content on the workability of geopolymers is the greatest. (2) Quadric response surface test shows that the strength of spontaneous combustion coal gangue, slag and fly ash geopolymer cement sand increases with the decrease of water glass modulus. The content of ligand increased with the increase of ligand content. When the modulus of sodium silicate is 1.0 and the content of ligand is 20, the flexural strength and compressive strength of cemented sand reach 7.55 MPA and 56.52 MPA respectively. However, insoluble precipitates occur when the water glass modulus is less than 1.0, so the water glass modulus should not be lower than 1.0. When the content of ligands exceeds 20, the cement sand is obviously viscous, (3) other technical performance measurement results show that all the indexes of spontaneous combustion gangue, slag and fly ash geopolymer accord with the national standard of GB175-1999.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU52
【参考文献】
相关期刊论文 前10条
1 李珍;韩炜;邵晓妹;;地质聚合物在材料领域的应用及其发展方向[J];长江科学院院报;2008年04期
2 马鸿文,杨静,任玉峰,凌发科;矿物聚合材料:研究现状与发展前景[J];地学前缘;2002年04期
3 陈飞虎;自燃煤矸石国内外研究与应用情况[J];硅酸盐建筑制品;1996年01期
4 李海红;徐惠忠;高原;刘子全;阎逢元;;矿物聚合物材料的研究进展[J];机械工程材料;2006年06期
5 张丽;浅谈路面混凝土原材料的选择[J];东北公路;1998年02期
6 徐彬,张天石,吕淑珍,邓国柱;大掺量煤矸石水泥混凝土耐久性研究[J];混凝土与水泥制品;1997年06期
7 张长森,蔡树元,张伟,赵志惠;自燃煤矸石作活性掺合料配制高强混凝土的试验研究[J];混凝土与水泥制品;2004年06期
8 段宏伟,倪文,李建平;地质聚合物在新型建材中的应用[J];建材工业信息;2004年03期
9 黄爱悦,郭爱民;煤矸石混凝土的研制及应用[J];建井技术;2000年06期
10 毕银丽;全文智;柳博会;;煤矸石堆放的环境问题及其生物综合治理对策[J];金属矿山;2005年12期
本文编号：2272285
本文链接：https://www.wllwen.com/kejilunwen/sgjslw/2272285.html
