固体激发剂对单组份碱激发矿渣-飞灰复合胶凝材料的影响

doi:10.16552/j.cnki.issn1001-1625.2024.1321

摘要/Abstract

摘要： 常规碱性溶液激发剂具有高腐蚀性和黏稠性,限制了碱激发技术在飞灰处置上的大规模应用,选择合适的固体激发剂对于制备胶凝材料至关重要。本文制备了单组份碱激发矿渣-飞灰复合胶凝材料,探讨了不同固体激发剂对胶凝材料力学性能及其水化产物的影响,以寻求更有效的飞灰处理解决方案。结果表明,五水硅酸钠能提高胶凝材料的早期强度,额外的硅源促进了硅氧四面体的形成,有利于生成网状水化硅铝酸钙凝胶。氧化钙对后期强度的增长具有显著作用,胶凝材料28 d抗压强度最大值为28.90 MPa,较高的碱度能够使硅铝相持续溶解,发生更有效的聚合。硫酸钠、五水硅酸钠和氧化钙激发的胶凝材料的重金属浸出浓度均满足标准允许值。致密的凝胶结构有利于固定重金属,减少裂纹和孔隙,进一步减少重金属浸出量。

关键词: 垃圾焚烧飞灰, 单组份碱激发胶凝材料, 固体激发剂, 氧化钙, 抗压强度, 重金属浸出浓度

Abstract: The conventional alkaline solution activator has high corrosion and viscosity, which limits the large-scale application of alkali-activated technology in fly ash disposal. It is very important to select appropriate solid activator for the preparation of cementitious materials. One-part alkali-activated slag-fly ash composite cementitious material was prepared in this paper. The effects of different solid activators on the mechanical properties and hydration products of cementitious material were discussed in order to find a more effective fly ash treatment solution. The results show that sodium silicate pentahydrate can improve the early strength of cementitious material, and the additional silicon source promotes the formation of silicon-oxygen tetrahedron, which is conducive to the formation of network hydrated calcium aluminosilicate gel. Calcium oxide has a significant effect on the growth of later strength. The maximum compressive strength of cementitious material at 28 d is 28.90 MPa. The higher alkalinity can make the silicon-aluminum phase continue to dissolve and produce more effective polymerization. The heavy metal leaching concentrations in the cementitious material activated by sodium sulfate, sodium silicate pentahydrate and calcium oxide all meet the standard allowable values. The dense gel structure is conducive to the fixation of heavy metals, reducing cracks and pores, and further reducing the leaching amount of heavy metals.

Key words: municipal solid waste incineration fly ash, one-part alkali-activated cementitious material, solid activator, calcium oxide, compressive strength, heavy metal leaching concentration

中图分类号:

TQ177

叶伟开, 盛国栋, 鲁刘磊, 张锦红, 张宗洋, 董发鑫, 刘明旺, 汪峻峰, 罗琦. 固体激发剂对单组份碱激发矿渣-飞灰复合胶凝材料的影响[J]. 硅酸盐通报, 2025, 44(5): 1779-1787.

YE Weikai, SHENG Guodong, LU Liulei, ZHANG Jinhong, ZHANG Zongyang, DONG Faxin, LIU Mingwang, WANG Junfeng, LUO Qi. Effect of Solid Activator on One-Part Alkali-Activated Slag-Fly Ash Composite Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1779-1787.

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