粉煤灰活化及其胶凝性能研究  

Study on Activation of Fly Ash and Its Cementitious Properties

作　　者：刘冲 何天松 王渝榕 史忠涛 毛明艳 吴红 Liu Chong;He Tiansong;Wang Yurong;Shi Zhongtao;Mao Mingyan;Wu Hong(College of Chemistry and Materials Engineering,Liupanshui Normal University,Liupanshui 553004,China;Liupanshui Inspection and Testing Center,Liupanshui 553004,China)

机构地区：[1]六盘水师范学院化学与材料工程学院,贵州六盘水553004 [2]六盘水市检验检测中心,贵州六盘水553004

出　　处：《山东化工》2022年第21期11-13,共3页Shandong Chemical Industry

基　　金：六盘水地区粉煤灰活化及胶凝性能研究(LPSSYDXS2015);基于煤炭清洁高效利用与生态环境保护的化学工程与工艺专业应用型人才培养课程体系构建(LPSSYxgk 201804);贵州省煤炭洁净加工与转化利用创新群体(黔教合KY字[2020]027);六盘水煤基固体废弃物理化性能分析及工业利用方向研究(52020-2018-04-01);六盘水师范学院一流本科专业项目(LPSYylbkz)。

摘　　要：通过热活化、复合活化和酸活化三种方法对粉煤灰进行活化处理,以期提高其潜在胶凝性能。结果表明:复合活化的粉煤灰活性效果最好,结合XRF、XRD和IR分析发现此方法有效地将粉煤灰中惰性组分二氧化硅和三氧化铝转变为无定形态,通过SEM发现粉煤灰表面形成了很多疏松的孔洞。将三种活化粉煤灰制备成胶凝试块,养护3,7,28 d测其抗压强度,复合活化粉煤灰制备的胶凝试块凝固周期明显缩短,在养护7 d的抗压强度性能就达到了GB/T 177(Ⅱ)要求。Fly ash is an inorganic mineral powder after pulverized coal combustion in coal-fired power plants.It is one of the largest solid wastes in China.Fly ash used in concrete has good hardness,high temperature resistance and freeze-thaw performance.In order to improve its potential cementitious properties,fly ash was activated by thermal activation,compound activation and acid activation in this paper.The results showed that the compound activated fly ash had the best activity.Combined with XRF,XRD and IR analysis,it was found that this method can effectively convert the inert components of silica and alumina into amorphous form in fly ash.Many loose holes were found on the surface of fly ash by SEM.Preparation of three kinds of activated fly ash into cementitious test block and test its compressive strength after curing for 3,7 and 28 d.The solidification period of cementitious test blocks prepared by composite activated fly ash is obviously shortened.After curing for 7 d,the compressive strength performance reaches GB/T 177(Ⅱ)requirements.

关 键 词：粉煤灰活化 胶凝试块 抗压强度 

分 类 号：TQ536.4[化学工程—煤化学工程]