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The coarse aggregates act like bone in concrete. If we use low quality aggregate in concrete mix, the strength of concrete will be low. The amount of aggregate greatly affects the properties of hardened concrete. Increasing the amount of aggregate at a constant cement content reduce the concrete strength. Strength of concrete can also be affected by the type of aggregate. Such as, angular and rough surface concrete increase the concrete strength.
The runoff coefficient or curve number of the paved area should be that of the subgrade soils in the compacted state. Over-compaction of the subgrade during construction will prevent necessary infiltration. Structurally, pervious concrete is weaker than plain concrete with compressive strengths less than 1000 psi. Due to the lower strengths, pervious concrete pavements are acceptable for light duty applications such as car parking facilities, pedestrian areas, and low traffic pavements.