Specifications and additional Information - Boral

Hydrapave Permeable Paving
BOOK
3
PAGE
F8
Materials Specification
Subgrade
The subgrade must have a minimum CBR of 5. Engineering
advice should be obtained where the subgrade does not meet
this specification.
Membrane/Filter Fabric
Membrane (typical)
Typical Dimensions: 4m x 12.5m x 50µm - 23kg.
Tear Resistance: 40N/mm minimum.
Tensile Strength: 14.4mPa.
Durability: The membrane must remain flexible and not
degrade. It shall be resistant to U.V. light and puncturing.
Where methane or a high water table is present in the
subgrade it will be necessary to use a heavy-duty membrane
and to weld the joints.
The membrane should be protected against puncturing.
Filter Fabric
The grade will vary according to the precise application.
Refer to the project hydraulic or stormwater engineer for
specifications.
Sub-base
A sub-base of 350mm as detailed on page F7 will enable the
Hydrapave system to have a holding capacity of 1m 3 of water
for every 10m 2 of paved area. The permeability of the pavers
themselves is 9,000L/m 2/hour. The depth of sub-base can
accordingly be varied at the discretion of the engineer.
The granular sub-base material shall comprise crushed
gravel, rock or concrete possessing well defined edges. It must
be sound, clean, non friable and free from clay or other
deleterious matter.
The material must be non-plastic.
The crushed stone used for the laying course and sub-base
must have a minimum 10% fines value of 150kN.
The selected test samples shall not be oven dried and should
be soaked in water at room temperature for 48 hours before
the test.
Sub-base — Lower Layer
A 250mm deep layer of stone. Grading to comply with:
Sieve Size % Passing
100mm 100
63mm 90-100
37.5mm 60-80
20mm 15-30
10mm 0-5
Sub-base — Upper Layer
A 100mm deep layer of graded 20-5mm crushed stone.
Filter Fabric
The upper filter fabric grade will vary according to the precise
application. For information on geotextiles and filter fabrics
contact Polyfabrics Australia Pty Ltd (02) 4627 6444.
Laying Course
50mm depth of 2 - 5mm single size (near as possible) clean
crushed stone.
Paver
Pavers are to be Hydrapave as manufactured by Boral
Masonry. Colour to be specified by project engineer.
Joint Filling
2 - 5mm single size clean stone applied at the rate of
approximately 1 - 2 kg/m 2.
Strip Drain
119 (incl. nibs) 234 (incl. nibs)
64 40 7
64 40 76 40 6
Specification of strip drains should be provided by the
project hydraulic or stormwater engineer.
Hydrapave Nominal Size: 230mm x 115mm
80