Study on the effect of porosity and pore size distribution characteristics on the performance of pervious concrete
By comparing the flowability of cement slurry,5%silica fume,0.5%water reducer dosing of new cementitious materials and 0.28 water-cement ratio were selected to prepare pervious concrete.In order to combine the actual situation of the project,the porosity de-sign and layered molding of the pervious concrete were carried out,and the internal pore characteristics of the layered pervious concrete were investigated by combining the binarization method.By adjusting the thickness of the surface layer with small particle size to change the internal pore size distribution,the effective pore size was defined to measure the pore size characteristics,and the effects of porosity and effective pore size on the performance of pervious concrete were studied.The results show that with the decrease of the thickness of the surface layer,the small pore content gradually decreases and the effective pore size gradually increases.When the porosity is in the range of 15%to 27%,the compressive strength of the pervious concrete decreases and the permeability coefficient increases as the effective pore size and porosity increase.Numerical fitting analysis shows that there is a strong linear relationship between porosity,effective pore size and compressive strength of pervious concrete.And there is a positively correlated quadratic polynomial function relationship between porosity,effective pore size and water permeability coefficient.
pervious concreteporositypore size distribution characteristicspermeability coefficientstrength
万方数据
