高速含砂水流作用下混凝土抗冲磨性能与孔隙结构内在联系研究  

Research on Internal Relations between Abrasion Resistant Properties and Pore Structure of Concrete under High Speed Sandy Flow

作　　者：江东奇[1] 曾力[1] 高珍[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点试验室,武汉430072

出　　处：《中国农村水利水电》2013年第10期57-60,63,共5页China Rural Water and Hydropower

基　　金：国家大坝安全工程研究中心基金(2011NDS025)

摘　　要：高水头、大流量以及泄水功率大是目前大型水利工程的显著特点,这些特点向混凝土的抗冲磨性能提出了严峻的挑战。为此本文设计了一系列不同配合比的抗冲磨混凝土,然后分别进行了抗冲磨试验,吸水动力学法测定孔隙特征的试验,通过对比分析抗冲磨强度和开口孔体积、孔径均匀性指标和平均孔径等参数的试验数据,发现混凝土的抗冲磨性能与孔隙特征具有相关性,即孔隙率越小,平均孔径越小,混凝土的抗冲磨性能越好。因此通过采取掺加粉煤灰、硅粉等以改善混凝土界面,改进搅拌工艺提高混凝土致密度等措施都有助于抗冲磨强度的提高。High head, great flow and draining power is the notable features of the large-scale water conservancy projects, which present serious challenges to abrasion resistance of concrete. This paper designs a series of abrasion resistant concrete with different mixing ratios, then conducts tests to study the abrasion resistant strength and pore structure characteristics of concrete, through contrastively analyzing the experimental data of abrasion resistant strength and pore structure characteristic parameters like pore volume of the opening, index of pore size uniformity, average pore size, correlations between abrasion resistance properties and pore structure characteristics of concrete are found, that is, the smaller the porosity or the average pore size, the better the abrasion resistance properties of concrete. Thus measures like mixing fly ash or silica fume, improving stirring process, etc, can be applied to reduce porosity and compactness of concrete so that the abrasion resistant properties of concrete can be improved.

关 键 词：抗冲磨强度 抗压强度 孔隙率 平均孔径 

分 类 号：TV431[水利工程—水工结构工程]