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碱激发对粉煤灰活性的影响
引用本文:杨晓光,倪文,张筝,徐丽,王亚利,杨海龙.碱激发对粉煤灰活性的影响[J].北京科技大学学报,2007,29(12):1195-1199.
作者姓名:杨晓光  倪文  张筝  徐丽  王亚利  杨海龙
作者单位:北京科技大学土木与环境工程学院金属矿山高效开采与安全教育部重点实验室,北京,100083
摘    要:研究了粉煤灰的物理化学特性,设计了四种方案对粉煤灰进行改性,旨在扩大粉煤灰的应用. 通过对比改性前后Na2SiO3-粉煤灰试块的强度,使粉煤灰在改性前后的反应速度通过试块的强度得以体现. 扫描电镜照片显示,在机械粉磨结合化学激发处理后,坚硬的外壳大部分被破坏. 27Al的核磁共振图谱显示宽峰变窄. 29Si的核磁共振谱表明,Q0消失,Q2增多,Q4减少. 说明加入强碱并同时机械粉磨可有效破坏粉煤灰的玻璃微珠外壳及硅铝网络结构,可增强粉煤灰的潜在活性.

关 键 词:粉煤灰  改性  碱激发  水玻璃  碱激发  粉煤灰活性  影响  activity  fly  ash  alkali  activation  潜在活性  增强  网络结构  硅铝  玻璃微珠  强碱  核磁共振谱  图谱  破坏  外壳  处理  化学激发  结合  机械粉磨
收稿时间:2006-08-23
修稿时间:2007-02-07

Effect of alkali activation on fly ash activity
YANG Xiaoguang,NI Wen,ZHANG Zheng,XU Li,WANG Yali,YANG Hailong.Effect of alkali activation on fly ash activity[J].Journal of University of Science and Technology Beijing,2007,29(12):1195-1199.
Authors:YANG Xiaoguang  NI Wen  ZHANG Zheng  XU Li  WANG Yali  YANG Hailong
Abstract:The structure of fly ash was analyzed to extend its scope of application.The compressive strengths of Na2SiO3 and fly ash blocks modified by four methods were compared to display the chemical reaction speed of fly ash.SEM photographs showed that after mechanical grinding and alkali activation most of the stiff shells of fly ash were destroyed,and MAS NMR of 27Al showed that wide peaks became narrow.MAS NMR of 29Si indicated that Q0 disappeared,the quantity of Q2 increased but that of Q4 decreased.It is concluded that after mechanical grinding and alkali activation,the hard shells of fly ash are destroyed,the polymerization degree of silicon-oxygen and aluminum-oxygen is reduced,and the potential activity of fly ash is enhanced.
Keywords:fly ash  modification  alkali activation  water glass
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