灰渣-凝灰岩基地质聚合物力学性能研究

摘要/Abstract

摘要： 为探索生活垃圾焚烧灰渣的资源化应用前景,本文考察了生活垃圾焚烧灰渣与凝灰岩制备地质聚合物的可行性。本文采用单轴抗压强度试验、XRD、FTIR和SEM等研究灰渣掺量、硅钠摩尔比和碱当量对灰渣-凝灰岩基地质聚合物性能的影响。结果表明:养护时间对灰渣-凝灰岩基地质聚合物的物理力学性能影响较大,在最佳工艺参数(灰渣掺量为20%,硅钠摩尔比为1.7,碱当量为9%)下,灰渣-凝灰岩基地质聚合物的28 d单轴抗压强度为23.2 MPa,体积密度为1.56 g/cm³。灰渣-凝灰岩基地质聚合物主要物相为石英、透长石、硫铝酸钙和方解石,地质聚合反应过程生成大量硅铝酸盐凝胶,导致地质聚合物微观结构呈大颗粒与小颗粒胶连状。灰渣-凝灰岩基地质聚合物的重金属浸出毒性满足国家规范要求。

关键词: 凝灰岩, 灰渣, 地质聚合物, 单轴抗压强度, 体积密度, 微观分析

Abstract: In order to explore the resource utilization prospects of municipal solid waste incineration bottom ash, the feasibility of preparing geopolymer from waste incineration bottom ash and tuff was investigated. The effects of bottom ash content, silicon-sodium molar ratio and alkali equivalent content on the properties of bottom ash-tuff based geopolymer were studied through uniaxial compressive strength test, XRD, FTIR and SEM. Test results show that the curing time has a great influence on the physical and mechanical properties of bottom ash-stuff based geopolymer. The optimal process parameters of bottom ash-stuff based geopolymer are bottom ash content of 20%, the silicon-sodium molar ratio of 1.7 and the alkali equivalent content of 8%. Bottom ash-stuff based geopolymer has a uniaxial compressive strength of 23.2 MPa and bulk density of 1.56 g/cm³ for curing 28 d. The main phases of bottom ash-stuff based geopolymer are quartz, sanidine, yeelimite and calcite. A large number of aluminosilicate gels are generated during the geopolymerization process, resulting in the microscopic structure of bottom ash-stuff based geopolymer shows a binding structure of small and larger particles. Toxicity characteristic leaching procedure of heavy metals in bottom ash-stuff based geopolymer meets the requirements of safety and environmental protection.

Key words: bottom ash, tuff, geopolymer, uniaxial compressive strength, bulk density, microscopic analysis

中图分类号:

TU528

吴建勋, 蒋健, 杨永浩, 孔宇, 詹欣源, 罗志浩, 陈亮. 灰渣-凝灰岩基地质聚合物力学性能研究[J]. 硅酸盐通报, 2023, 42(11): 4072-4081.

WU Jianxun, JIANG Jian, YANG Yonghao, KONG Yu, ZHAN Xinyuan, LUO Zhihao, CHEN Liang. Mechanical Property of Bottom Ash-Tuff Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4072-4081.

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