成型压力对透水混凝土抗压强度和孔隙结构的影响研究  

Effect of Forming Pressure on Compressive Strength and Pore Structure of Pervious Concrete

作　　者：薛成广 张东生 杨秋宁[1] XUE Chengguang;ZHANG Dongsheng;YANG Qiuning(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Department of Civil Engineering,KU Leuven,Bruges 8200,Belgium)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]Department of Civil Engineering,KU Leuven,Bruges 8200,Belgium

出　　处：《宁夏工程技术》2024年第2期154-159,共6页Ningxia Engineering Technology

基　　金：宁夏回族自治区重点研发项目(2022BDE93016,2021BEG02014);银川市科技计划(2022ZDGX17)。

摘　　要：为探究透水混凝土在不同成型压力下的力学性能和孔隙结构,采用图像分析法对透水混凝土的孔隙个数、孔隙等效直径、孔隙率等孔隙特征进行分析处理。结果表明:随着成型压力的不断增大,透水混凝土呈现出孔隙率降低、抗压强度增大、孔隙个数增多、孔隙等效直径减小和孔隙分布更均匀的趋势;透水混凝土的透水系数与孔隙率呈正相关关系,透水系数的大小主要取决于透水混凝土的最小渗透率层。综合分析各因素得出,成型压力为3 MPa的透水混凝土性能更优,此时透水混凝土孔隙分布均匀,孔隙率可达21.23%,透水系数为3.87 mm/s,抗压强度为22.96 MPa。In this study,the mechanical properties and pore structure of pervious concrete under different forming pressures were investigated using image analysis.Pore characteristics such as the number of pores,equivalent pore diameter,and porosity were analyzed.The results show that as forming pressure increases,the porosity of pervious concrete decreases,compressive strength increases,the number of pores increases,equivalent pore diameter decreases,and pore distribution becomes more uniform.The permeability coefficient,primarily determined by the minimum permeability layer of the pervious concrete,is positively correlated with porosity.Comprehensive analysis shows that the pervious concrete formed under a pressure of 3 MPa exhibits optimal performance,with uniform pore distribution,a porosity of 21.23%,a permeability coefficient of 3.87 mm/s,and a compressive strength of 22.96 MPa.

关 键 词：图像分析 成型压力 孔隙结构 透水混凝土 

分 类 号：TU528[建筑科学—建筑技术科学]