Pore representation and the relationship between pore and permeability of the porous concrete

Relationship between the valid porosity and anticipate porosity of three different mineral admixtures i.e.fly ash,slag and silica fume of the porous concrete is studied respectively.The relationship among the valid porosity,permeability coefficient,plane porosity,equivalent aperture and compressive strength and the situation of pore distribution is also discussed.The results show that it can effectively control the porosity of the porous concrete by adopting absolute volume method.Among the different mineral admixture,the valid porosity and permeability coefficient ex- ists nicer quadratic function relationship,the valid porosity and permeability coefficient basically becomes inversely-proportional relationship, which could get the correlative relational equation.The size of equivalent aperture and the number of the pores influence the change of the plane porosity.When the valid porosity of the different mineral admixtures porous concrete are from 20% to 30%,the size of the equivalent aperture ra- dius is from 10mm to 20mm.Furthermore,the main size is from 13mm to 16mm,in which range,the increasing amplitude of the permeability co- efficient achieves the maximum value.