Permeable pavements: Specifications

Specifications for pervious concrete, porous asphalt, and permeable pavers

Material	Specification	Quantity
Pervious concrete	28 day compressive strength = 5.5 to 20 MPa Void ratio = 14% - 31% Permeability = 900 - 21,500 mm/hr	Thickness will range from 100 mm - 150 mm depending on the expected loads
Porous asphalt	open-graded asphalt mix with a minimum of 16 % air voids Polymer can be added to provide additional strength to heavy loads	Thickness will range from 50 mm - 100 mm depending on the expected loads
Permeable pavers	ASTM No. 8(5 mm dia) crushed aggregate is recommended for fill material in the paver openings. Pavers shall meet the minimum material and standard specification for precast concrete pavers. Pigment in concrete pavers shall conform to ASTM C 979 ACI Report No. 212.3R provides guidance on the use of pigments. Maximum allowable breakage of product is 5%	For vehicle applications the minimum paver thickness is 80 mm For pedestrian applications is 60 mm and joint widths should be no greater than 15 mm.

A mixture of mineral aggregates bound with bituminous materials, used in the construction and maintenance of paved surfaces.

The void ratio (e) of a mixture is the ratio of the volume of void-space to the volume of solids. It is closely related to the concept of porosity (n) where porosity is the ratio of the volume of void-space to the total or bulk volume of the mixture. e = Volume of voids/Volume of solids = n/(1-n)

A broad category of particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates, and available in various particulate size gradations.