What is a Permeable Pavement?
Permeable pavements are pavement systems that allow water to pass through the surface in to an open-graded aggregate base. Widely recognized as a Low Impact Development (LID) strategy, Oaks permeable pavements conform to municipal storm water regulations.
Associated benefits may include: 1. On-site storm water quantity management 2. Improved water quality 3. Groundwater and tree root zone recharge
4. Reduced hydraulic, erosion and thermal impacts to receiving waters 5. Possible reduction or elimination of traditional storm water management infrastructure
PERMEABLE PAVEMENT SYSTEM Below are the main components of a Permeable Interlocking Concrete Pavement (PICP) system.
Concrete Curb
Concrete Pavers
Open Graded Bedding Layer
Permeable Joint Material
Open Graded Base Reservoir
Open Graded Sub-base
Geotextile (optional) in Full- or Partial Infiltration systems, liner in No-Infiltration systems
Underdrain (optional in Full-Infiltration systems) Soil Subgrade (Uncompacted for Full- and Partial- Infiltration systems, compacted for No- Infiltration systems)
ASTM No. 8 Grading Requirements Jointing and Bedding Aggregates
Sieve Size 12.5 mm (1/2 in.) 9.5 mm (3/8 in.) 4.75 mm (No. 4) 2.36 mm (No. 8) 1.16 mm (No. 16)
Percent Passing 100 85 to 100 10 to 30 0 to 10 0 to 5
ASTM No. 57 Grading Requirements Base Aggregates
Percent Passing 100 95 to 100 25 to 60 0 to 10 0 to 5
Sieve Size 37.5 mm (1 1/2 in.) 25 mm (1 in.) 12.5 mm (1/2 in.) 4.75 mm (No. 4) 2.36 mm (No. 8)
(commonly referred to as 1/4” clear stone)
ASTM No. 2 Grading Requirements Subbase Aggregate
Sieve Size 75 mm (3 in.) 63 mm (2 1/2 in.) 50 mm (2 in.) 37.5 mm (1 1/2 in.) 19 mm (3/4 in.)
Percent Passing 100 90 to 100 35 to 70 0 to 15 0 to 5
(commonly referred to as 3/4” clear stone)
All aggregate types listed should have less than 2% passing the No. 200 sieve, and should be manufactured sharp stone (not river rock)
(commonly referred to as rail ballast)
This symbol is used in the Products section of this Designer Resource Guide to indicate a permeable paving product. Contact us if you need help sourcing open-graded aggregate materials.
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