Abstract: The exposedpervious concrete were prepared by means of the following materials: P. 0 42. 5cement, P.S.A 32.5 cement, 10 ~20 mm or 5 ~ 10 mm single-sized gravel, 5 ~20 mm continuous graded gravel, water, water reducer, admixture and reinforcing agent, etc. The performance of the concretewas then studied. The results show that as the aggregate-to-cement ratio increases, the strength of theconcrete decreases and its porosity increases. The concrete mixed with 5 ~ 10 mm gravel exhibits highelstrength than that mixed with 10 ~20 mm gravel. Concrete made with P.0 42. 5 cement has higher porosity than concrete made with P.S.A 32. 5 cement. When the aggregate-to-cement ratio is 2. 76, using5 ~ 20 mm continuously graded gravel and P.S. A 32. 5 cement results in the lowest porosity of perviousconcrete, at only 4.3%.

Key words: exposed previousconcrete, previousconcrete, aggregate-to-cement ratio, concrete porosily