摘要
对煤矸石和粉煤灰再利用可减少其对生态环境带来的负面影响。本研究以煤矸石和粉煤灰为原材料,通过田口方法以预热温度、预热时间、煅烧温度、煅烧时间为试验参数,以压碎指标和导热系数为评价指标,优化制备细骨料工艺。借助X射线衍射、扫描电子显微镜和压汞仪从物相组成、微观形貌和孔隙结构方面分析了细骨料的保温机理。研究结果发现,在预热温度400℃、预热时间25 min、煅烧温度1 250℃和煅烧时间25 min条件下,可以制备出压碎指标为29.1%、导热系数为0.138 W/(m·K)的煤矸石-粉煤灰细骨料。煅烧温度的升高有助于增加莫来石晶体的含量和孔隙的密实度,并且,高温可重构多孔骨料的孔结构,孔径r>10 000 nm的孔隙数量大大提高,有助于提高细骨料强度和保温性能。
The recycling of coal gangue and fly ash can reduce the negative impact on ecological environment.In this study,coal gangue and fly ash were used as raw materials.The preheating temperature,preheating time,calcination temperature and calcination time were tested by the Taguchi method.And the crushing index and thermal conductivity coefficient were used as evaluation indexes to optimize the preparation process of fine aggregate.The insulation mechanism of fine aggregates was analyzed in terms of phase composition,micromorphology and pore structure using X-ray diffraction,scanning electron microscopy and mercury intrusion porosimetry.The research findings indicate that the raw materials can be processed under conditions of a preheating temperature of 400℃for 25 min,followed by a calcination temperature of 1250℃for 25 min,to produce coal gangue-fly ash fine aggregates with a crushing index of 29.1%and a thermal conductivity of 0.138 W/(m·K).Simultaneously,an increase in the calcination temperature contributes to an enhancement in the content of mullite crystals and the compactness of pores.Furthermore,high temperatures can reconstruct the pore structure of porous aggregates,increasing the number of pores with diameters greater than 10000 nm,which contributes to improving both the strength and thermal insulation performance of the fine aggregates.
作者
王萧萧
张浩东
朝鲁门
刘曙光
陈琦
WANG Xiaoxiao;ZHANG Haodong;CHAO Lumen;LIU Shuguang;CHEN Qi(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Green Construction and Intelligent Operation and Maintenance of Civil Engineering,Hohhot 010051,China;Inner Mongolia Engineering Research Center of Ecological Building Materials and Prefabricated Construction,Hohhot 010051,China;School of International Engineering,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《硅酸盐通报》
北大核心
2025年第8期2924-2932,共9页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(52469023)
中央引导地方科技发展资金项目(2021ZY0024)
内蒙古自治区直属高校基本科研业务费项目(JY20240076)。
关键词
田口方法
煤矸石
粉煤灰
细骨料
保温性能
Taguchi method
coal gangue
fly ash
fine aggregate
thermal insulation performance
作者简介
王萧萧(1987-),女,博士,副教授。主要从事煤基固废材料方面的研究。E-mail:wangxiaoxiao@imut.edu.cn;通信作者:朝鲁门,助理研究员。E-mail:chaolumen@imut.edu.cn。
