The Aggregate Gradation for the Porous Concrete Pervious Road Base Material

摘要

The effects of the proportion of fine aggregate,the maximum size of the aggregate and the proportion of the 9.5 mm to 4.75 mm particle in the coarse aggregate on the properties of the porous concrete are investigated.Results indicate that the porous concrete with a cement dosage only 150 kg/m3 has high strength and satisfying permeability when the aggregate has a passing percentage of 4.75 mm around 10%to 15%,with the increase of the maximum size of the aggregate,the strength of the porous concrete decreases and the permeability increases.When the proportion of the 9.5 mm to 4.75 mm particle in the coarse aggregate is about 20%,there are no interference among the particles by Weymouth theory,the strength of the pervious porous concrete reaches the peak value.The optimum continues gradation limit of the aggregate for porous concrete pervious road base material is recommended according to the theoretical calculation and experimental results.