摘要
为研究不同类型粉煤灰制备的地聚物砂浆工作性能和力学性能,通过孔隙结构测定、傅里叶变换红外光谱测试和扫描电子显微镜-能谱分析,系统研究了不同粉煤灰基地聚物砂浆的微观结构特性。结果表明:Ⅰ级粉煤灰制备的地聚物砂浆流动性略低于Ⅱ级粉煤灰制备的地聚物砂浆,这主要与粉煤灰的物理性质相关,且平均粒径的影响大于需水量比的影响,粗颗粒粉煤灰制备的地聚物砂浆流动性较差;Ⅰ级粉煤灰制备的地聚物砂浆抗压和抗折强度均优于Ⅱ级粉煤灰基地聚物砂浆;粉煤灰的化学组成,特别是SiO_( 2)与Al_(2)O_(3)的比值,对粉煤灰基地聚物砂浆的力学性能影响最大,含较高SiO_( 2)/Al_(2)O_(3)的粉煤灰可提高基体的致密性,表现为存在大量分布均匀的细孔。工程实践中建议优先选择具有适宜粒径和高SiO_( 2)/Al_(2)O_(3)比值的粉煤灰,以优化地聚物材料的性能。
In order to study the working performance and mechanical properties of geopolymer mortar prepared by different types of fly ash,the microstructure characteristics of geopolymer mortar were systematically studied by pore structure determination,Fourier transform infrared spectroscopy and scanning electron microscope-energy spectrum analysis.The results show that the fluidity of geopolymer mortar prepared with grade Ⅰ fly ash is slightly lower than that of geopolymer mortar prepared with grade Ⅱ fly ash,which is mainly related to the physical properties of fly ash,and the influence of fly ash average particle size on geopolymer mortar performance is greater than that of water demand ratio.The fluidity of geopolymer mortar prepared with coarse fly ash is relatively poor.The compressive and flexural strength of geopolymer mortar prepared with grade Ⅰ fly ash are better than those prepared with grade Ⅱ fly ash.The chemical composition of fly ash,especially the ratio of SiO_(2)to Al_(2)O_(3),has the greatest influence on the mechanical properties of fly ash-based geopolymer mortar.The fly ash containing higher SiO_(2)/Al_(2)O_(3)can improve the compactness of the matrix,which is characterized by a large number of evenly distributed fine pores.In engineering practice,it is suggested to give priority to the selection of fly ash with suitable particle size and high SiO_(2)/Al_(2)O_(3)ratio,which has optimized the performance of geopolymer materials.
作者
王林
冯立冲
王晓东
李雪健
WANG Lin;FENG Lichong;WANG Xiaodong;LI Xuejian(Hangang Expressway Co.,Ltd.,Hebei Expressway Group Ltd.,Shijiazhuang 053708,China;Zhangjiakou Construction Engineering Quality Inspection Center Co.,Ltd.,Zhangjiakou 075051,China;College of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《人民长江》
北大核心
2025年第8期200-208,215,共10页
Yangtze River
基金
中央引导地方科技发展资金项目(216Z3801G,236Z1504G)。
关键词
粉煤灰
地聚物砂浆
工作性能
力学性能
灰色关联分析
fly ash
geopolymer mortar
working performance
mechanical property
grey relational analysis
