Specifications

STANDARD SPECIFICATION - BUILDINGS
DPI REFERENCE TEXT - APRIL 2009
PAGE 37
20. PAVING
20.1 GENERAL
Cross reference
Refer to the Site Preparation section for ll types.
Footpath crossing
Provide a footpath and kerb crossing to local council
requirements.
20.2 MATERIALS AND COMPONENTS
Mortar materials
Sand: Use a ne aggregate with a low clay content
selected for grading.
Cement: To AS 3972, type GP.
Mortar
Mix proportions: 1:3 cement: sand.
20.3 CONSTRUCTION GENERALLY
Grading
General: Grade paving to even falls to drain away
from buildings to drainage outlets without ponding.
Minimum fall for drainage: 1:100.
20.4 BASE COURSE
Preparation
Prepare the subgrade to suit the thickness of the
base course and paving. If necessary, loosen the
ground to a depth of 200 mm and adjust the moisture
content before compaction. Compact the ground
to a rm even surface using at least 2 passes of
a vibrating plate compactor or roller. Remove and
replace soft areas with suitable ll.
Base course material
Provide well-graded crushed rock or gravel, free of
deleterious material, with a maximum particle size
of 26.5 mm, uniformly graded and with a maximum
clay content of 6% by mass.
Placing
Spread and compact the base course to a rm,
tight, close textured surface using at least 3
passes of a vibrating plate compactor or roller.
Adjust the moisture content as needed to facilitate
compaction.
PAVING
Base course minimum thickness table
Comply with the following minimum thicknesses:
Site classication to AS 2870
Unit paving Bituminous paving
A S&M A S&M
Foot and bicycle 0 0 50 mm 100 mm
trafc
Light domestic 0 75 mm 100 mm 150 mm
trafc occasionally
up to 3 tonne gross
20.5 ASPHALT PAVING
Hotmix paving
Standard: Place and compact asphaltic concrete
paving over the prepared base course to AS 2150.
Mix designation: AC7.
Bitumen binder: Class 320 bitumen.
Minimum thickness: 25 mm.
Tack coating: Bitumenous emulsion spray to
AS 2150.
20.6 SPRAY SEALING
Preparation
Prepare the surface as per the Gravel Driveways
clause.
Priming: Prime the surface with cutback bitumen to
AMC 00 at the rate of 1 litre per m
2
.
Sealing
Apply the bitumen seal at the rate of 2.5 litres per
m
2
.
Mix Designation: S10E.
Aggregate: Apply 14 mm aggregate and roll into the
surface.
Completion
Broom off the excess aggregate and remove from
site.
20.7 UNIT PAVING
Masonry segmental pavers
General: Provide paving units of clay, natural stone or
concrete masonry, purpose-made for use as paving,
or units made for bonded masonry construction but
suitable for paving.
Standard: To AS/NZS 4455.1 and AS/NZS 4455.3.
Minimum thickness:
• Foot and bicycle trafc: 40 mm.
• Light domestic trafc occasionally up to 3 tonne
gross: 60 mm.
Cutting units: Cut paving units to maintain sharp
edges and accurate joints and margins.
Pattern: As shown on the drawings otherwise
stretcher bond.
Laying unit paving
General: Over the base course, lay the units on
bedding sand screeded to a uniform thickness not
exceeding 50 mm, and to the required falls and
levels. Do not disturb the screeded sand bedding
before the units are laid. Provide a gap of 1-3 mm
wide between adjoining units. After laying, tamp the
units using a vibrating plate compactor.
Dry joints: Fill the joints ush with clean, ne sand
or screened bedding sand passing a 1.2 mm sieve,
vibrate into the joints and then make 2 further passes
of the vibrating plate compactor.
Edge restraint
Provide concrete llet edge restraint where needed
to support the sand bedding and maintain the paving
shape.
Specifications March 2009.indd 37 11/03/2009 11:47:13 AM