5.1 Aggregate Base
Aggregate base for pavement shall be evaluated by the designer for each individual site to determine whether the minimum required standard depth of aggregate base is suitable for the traffic loads proposed for the site. The standard minimum aggregate base for all pervious concrete pavements shall be 8 inches of INDOT Gradation No. 2 Course Aggregate. The volume of void space for the proposed aggregate base compacted in place should be obtained from the supplier for use in determining the storage capacity of pavement base. The void ratio by volume for the aggregate base layer shall be 35% ± 5%.
5.2 Pavement
The minimum thickness of pervious concrete pavement used for commercial or institutional use shall be 8 inches. Locations subject to higher amounts of truck traffic shall be evaluated using traditional rigid pavement design techniques and increasing the depth of the rigid pavement by a factor of 1.25. The void ratio in the mixture shall be determined and range between 15% and 20% by volume.