粉煤灰掺量对堆石坝面板混凝土的抗渗性研究  

Study on Impermeability of Concrete Face Slab of Rock-Fill Dam with Fly As

作　　者：庄一 ZHUANG Yi(Xingyi City Water Affairs Bureau,Xingyi 562400,Guizhou,China)

机构地区：[1]兴义市水务局,贵州兴义562400

出　　处：《水利科技与经济》2024年第7期138-141,共4页Water Conservancy Science and Technology and Economy

摘　　要：为了研究粉煤灰掺量对堆石坝面板混凝土渗透性、孔隙结构及分形特征的影响,制备不同粉煤灰掺量的面板混凝土试件,对试件进行抗渗性测试、孔隙结构分析以及孔隙表面分形维数测定。结果表明,添加粉煤灰会降低混凝土早期抗压强度及早期面板混凝土的抗渗性,但后期适量粉煤灰可优化混凝土孔隙结构,使混凝土的孔隙率降低和孔径分布细化,分形维数明显提高。In order to study the effect of fly ash content on permeability,pore structure and fractal characteristics of concrete face slab of rock-fill dam,to prepare the concrete face slab specimens with different fly ash content,and to carry out the impermeability test,pore structure analysis and fractal dimension of pore surface of specimens.The research results show that adding fly ash can reduce the early compressive strength of concrete and impermeability of early face slab concrete,but appropriate amount of fly ash in later stage can optimize the pore structure of concrete,reduce the porosity of concrete and refine the pore size distribution,the fractal dimension is obviously increased.

关 键 词：粉煤灰 面板混凝土 孔隙结构 分形维数 

分 类 号：TV431[水利工程—水工结构工程]