Requirements for Approval of Pipe Bedding Material and Fill Sand (Backfilling Material)
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Blacktown City Council
Requirements for Approval of Pipe Bedding
Material and Fill Sand (Backfilling Material)
Notes:
1. This specific diagram is to indicate distribution of Pipe Bedding Material and Fill
Sand. All other requirements for Pipe laying and trench dimensions etc are to be in
accordance with AS 3725 – 2007 and Blacktown City Council requirements.
2. For Bed zone and Haunch zone definitions and dimensions refer AS 3725 – 2007.
3. Generally Haunch zone height shall be 1/3 of pipe diameter minimum, otherwise as
directed by Council Engineer.
1Pipe Bedding Material
Pipe bedding material, both natural and recycled, shall comply with following requirements:
TABLE 1 - SPECIFICATION REQUIREMENTS FOR RECYCLED PIPE BEDDING MATERIAL
Material Type
Constituent/Property Test Method
Pipe Bedding Material
Class D75 Class D20 Class D10
Suggested Material Proportions ( max %
by mass)
1
Concret e 100 100 100
Reclaimed Asphalt 5 5 5
Clay Brick Tile, crushed rock, masonry 100 100 100
2
Run-of-station Flyash 5 5 5
3
Crushed Glass Fines 50 50 50
Foreign Material/Maximum Allowable
Contaminants (mas % by mass)
Abestos 0 0 0
4
Metal, glass and ceramics T276 5 5 5
Plaster, clay lumps and other friable
materials T276 0.5 0.5 0.5
Rubber, plastic, bitumen, paper, cloth,
paint, wood & T276 0.5 0.5 0.5
other vegetable matter
Particle Size Disbribution
% passing 100mm AS1141.11 100
% passing 75mm AS1141.12 80-100
% passing 53mm sieve OR
% passing 37.5mm sieve AS1289.3.6.1
% passing 26.5mm sieve 100
% passing 19.0mm sieve 5-10 80-100
% passing 13.2mm sieve 5-10 100
% passing 9.5mm sieve
% passing 4.75mm sieve 0-10
% passing 2.36mm sieve
% passing 0.425mm sieve
% passing 0.075mm sieve 0-5 0-5 0-5
2TABLE 1 (continued)
Material Type
Constituent/Property Test Method
Pipe Bedding Material
Strength Properties
Wet Strength (kN) AS1141.22 70 min 70 min 70 min
Wet/Dry Strength Variation (%) 35 max 35 max 35 max
Unconfined Compressive Strength (Mpa). AS5101.4 (2008) 0.5 max 0.5 max 0.5 max
Standard compaction at 7 days
accelerated curing
(This test is not required for natural material)
Draining Properties
Permeability AS 1289.6.7.2 - 1 meter 1 meter 1 meter head
2001 head per head per day per day min
day min min
Notes:
1. The design of pavements using high percentages of crushed concrete must take into
account the amount of available cement which may rehydrate when subject to
moisture to create a rigid or semi-rigid pavement which may result in subsequent
shrinkage cracking.
2. The design of pavements using flyash must take into account the possibility of
hydration and binding when subject to moisture which may create a rigid or semi-
rigid pavement which may result in subsequent shrinkage cracking.
3. Crushed Glass Fines refers to clean glass, which has been processed to produce an
aggregate product for which an Exemption has been issued.
4. Glass referred to in Maximum Allowable Contaminants is unprocessed glass which
has been roughly crushed but has not been processed to produce an aggregate
product for which an Exemption has been issued.
3Fill sand
Backfilling material (Fill Sand), both natural and recycled, shall comply with following
requirements:
Wet spearing is allowed in layers of 300mm max.
Test Method Limit Required
Atterberg Non-cohesive granular Liquid Limit 2% max
Limits material e.g. sand or AS1289.3.1.1- 2009
metal dust (No clay
contents or other material
with similar clayey Plastic Limit
2% max
properties is permitted). AS1289.3.2.1- 2009
Plasticity Index
AS1289.3.3.1- 2% max
2009
Particle Size Sieve analysis table 6, AS 1141.11.1- 2009 Table 6, AS3725 – 2007 Sieve
Distribution AS3725 -2007 Size Weight passing
mm %
19.0 100
2.36 100 to 50
0.60 90 to 20
0.30 60 to 10
0.15 25 to 0
0.075 10 to 0
Foreign Material /Maximum Allowable Contaminants
(mas % by mass)
Asbestos 0
4
Metal, glass and ceramics T276 5
Plaster, clay lumps and
other friable materials T276 0.5
Rubber, plastic, bitumen,
paper, cloth, paint, wood
& other vegetable matter T276 0.5
Strength Unconfined Compressive AS5101.4 (2008) 0.5max.
Properties Strength (Mpa) standard
compaction at 7 days
accelerated curing
(This test is not required for
natural material)
4Sampling and Testing (Quality Assurance)
1. All sampling shall be undertaken by a NATA certified technician.
2. All testing shall be undertaken by a NATA registered laboratory endorsed to undertake
the testing being carried out.
3. In carrying out conformance testing, the current issue of the following Standards and Test
Methods shall be used unless otherwise specified.
AS1141 Methods for Sampling and Testing Aggregates
AS1289 Method of Testing of Soil for Engineering Purposes
RTA T102 Pretreatment of Road Materials by Compaction
RTA T103 Pretreatment of Road Materials by Artificial Weathering
RTA T276 Foreign Material Content of Recycled Crushed Concrete
Frequency of Tests Required
The minimum sampling and testing requirements for a 4000tonnes stockpile are set out in
Table 2 below.
Table 2 - Minimum Number of Tests per Stockpile (4000 tonnes)
Total Mass of Stockpile (tonnes) Pipe Bedding Fill Sand
Material Class D
Property
Particle Size Distribution 3 3
Atterberg Limits NA 3
UCS 2 2
Aggregate Wet Strength 3 NA
Wet/Dry Variation 3 NA
Foreign Materials 3 3
NA – Not Applicable
Site Inspection
Each stockpile shall be inspected by Council Officer. Inspection fee applies.
Certification Process/Further Information
For further details on sampling and testing and how to make a stockpile refer Council’s
“Certification of Stockpiles Manual” on Council’s web site.
Go to www.blacktown.nsw.gov.au then click “Planning & Development” on top ribbon on
Blacktown City Council web site-then click on “Recycled & Natural Road Pavement
Materials”then click on “How to become a certified stockpile supplier”.
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I:\TTS\MaintGen\sehgolb2010\pipebedding&fillsandrequirements 10.12.2010
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