2.2.1.1
Concrete Subbase
Concrete material shall conform to Section 02754 CONCRETE PAVEMENTS FOR
SMALL PROJECTS.
2.2.1.2
Bituminous Subbase
Bituminous material shall conform to Section 02745 BITUMINOUS SURFACE
TREATMENT.
2.2.1.3
Aggregate Subbase
Aggregate material shall conform to Section 02722 AGGREGATE AND/OR
GRADED-CRUSHED AGGREGATE BASE COURSE.
2.2.2
Impact Attenuating Substrate
The substrate shall be compatible with the wear surface, and shall consist
of modular units; poured-in-place; or loose fill. Recycled materials shall
conform to EPA requirements in accordance with Section 01670 RECYCLED /
RECOVERED MATERIALS.
2.2.2.1
Poured-In-Place Substrate
Poured-in-place substrate shall consist of a [100] [_____] percent recycled
shredded styrene butadiene rubber (SBR) adhered with a 100 percent solid
polyurethane binder to form a resilient, porous material or shredded
rubber. Strands of SBR may vary from a minimum 0.5 mm 1/50 inch to a
maximum 2 mm 2/25 inch thickness; by a minimum 3 mm 1/8 inch to a maximum
20 mm 4/5 inch length. Binder shall be between a minimum 12 percent and a
maximum 16 percent of the total weight of the mixture of rubber and
urethane; and shall provide 100 percent coating of the particles. Foam
rubber will not be accepted in the substrate.
2.2.2.2
Loose Fill Substrate
The loose fill substrate shall consist of [100] [_____] percent recycled
shredded rubber produced from recycled vehicle tires without non-steel
belts. Loose-fill strands may vary from a minimum 3 mm 1/8 inch to a
maximum 6 mm 1/4 inch thickness; a minimum 3 mm 1/8 inch to a maximum 13 mm
1/2 inch width; and a minimum 13 mm 1/2 inch to a maximum 50 mm 2 inch
length.
2.2.3
Wear Surface
Wear surfaces consist of the following: a poured-in-place durable,
weather-resistant, ultraviolet stable, water permeable material top-coat;
an integral component of a tile system; synthetic turf wear surface; rubber
sheet wear surface; or a polyethylene woven plastic sheet wear surface.
The wear surface shall meet requirements of ASTM D 2047 for a minimum 0.8
coefficient of friction.
2.2.3.1
Poured-in-Place Wear Surface
Poured-in-place wear surface shall consist of ethylene propylene diene
monomer (EPDM) particles adhered with a polyurethane binder formulated to
produce an even, uniform surface. Particles of EPDM shall meet ASTM D 412
for tensile strength and elongation, and contain a minimum 25 percent of
rubber hydrocarbons. Particles of EPDM shall be peroxide or sulfur cured
SECTION 02791
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