再生透水混凝土基本性能与孔隙特征的研究  

Study on Basic Properties and Pore Characteristics of Recycled Aggregate Pervious Concrete

作　　者：郭丽朋[1] 朱强[1] 林姗 GUO Lipeng;ZHU Qiang;LIN Shan(Institute of Water Conservancy and Electricity,Changjiang Institute of Technology,Wuhan 430212,Hubei,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,Hubei,China)

机构地区：[1]长江工程职业技术学院水利与电力学院,湖北武汉430212 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《水力发电》2019年第12期117-122,共6页Water Power

基　　金：国家重点研发计划资助项目(2018YFE0100100)

摘　　要：以水灰比0.3、再生骨料粒径9.5~19.5 mm制备再生透水混凝土,研究了不同设计孔隙率(16%、18%、20%、22%、24%、26%)下再生透水混凝土实测孔隙率、抗压强度、透水系数变化规律;在此基础上,对试块进行切片、拍照、灰度化处理,基于Image法对平面孔隙分布进行提取、计算,从细观层面上分析了平面孔隙率、孔个数、等效孔径、分形维数对再生透水混凝土宏观性能的影响。结果表明,孔个数、等效孔径是影响抗压强度与透水系数的重要因素。此外,通过拟合发现,平面孔隙率、平面分形维数与抗压强度呈线性负相关,平面孔隙率与平面分形维数呈线性正相关,说明随着设计孔隙率的增加,再生透水混凝土内部孔隙结构越来越复杂。The recycled pervious concrete with water cement ratio of 0.3 and recycled aggregate particle size of 9.5-19.5 mm is prepared to study the measured porosity,compressive strength and permeability coefficient of recycled pervious concrete under different design porosity(16%,18%,20%,22%,24%and 26%)respectively.On this basis,the specimen is sliced,photographed and grayed,and the plane pore distribution is extracted and calculated by Image method.The influences of plane porosity,pore number,equivalent pore size and fractal dimension on macroscopic properties of recycled pervious concrete from the macroscopic aspects are analyzed.The results show that the number of pore and the equivalent pore size are important factors on affecting the compressive strength and permeability coefficient.In addition,through fitting,it is found that the plane porosity and plane fractal dimension are negative linear correlation with compressive strength,and the plane porosity is positive linear correlation with plane fractal dimension,which shows that,with the increase of design porosity,the pore structure of recycled pervious concrete becomes more and more complex.

关 键 词：再生透水混凝土 抗压强度 孔隙率 透水系数 

分 类 号：TU528[建筑科学—建筑技术科学]