Abstract
Recently, permeable or drainage pavement has been attracting interest, because it helps to improve walking and driving safety in rainy weather, and hasten to cultivate. As one of permeable or drainage pavement, the establishment of technique for porous concrete pavement is hoped. This paper describes porous concrete that is high strength and high void ratio, with the inorganic admixture "Road Mix", in stead of polymers. As landscape pavement, when total void ratio is 25%, its target values of compressive strength is more than 15.7N/mm2. From relationship between compressive strength and bending strength, 2.63N/mm2, is the target value instead of compressive strength, 15.7N/mm2. Laboratory tests showed that when the concrete has a more than a 35% m/g ratio, a 22% W/C ratio and a 2.0 C/S ratio, its properties achieved the target values of bending strength. A m/g ratio is a volume ratio, m is a unit volume of mortar which are composed by cement, admixture, fine aggregate and water, g is a unit volume of coarse aggregate. Result of execution test showed that the target values were achieved and surface of concrete was fine, when the concrete has a 42% m/g ratio. From the results described above, the possibility of application of high void porous concrete for landscape pavement use was confirmed. We plan to go ahead with a program including mixture technique of more high void porous concrete, its void ratio is 25%, evaluation of concrete durability.
