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) crused 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.

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

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

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.