Full-service
Everything required to build the pavement from start to finish, self-delivered and handed over complete.
- Pre-milling, spreading, mixing
- Compaction, trimming and rolling
- Seal coat or asphalt
- One contract, one site supervisor
Services / Stabilisation methods
Base-course stabilisation
The base course is the structural layer of a flexible pavement: the compacted granular material between the subgrade and the surfacing that actually carries the traffic.
What it is
When it loses strength, the road fails.
Base-course stabilisation binds that layer. The existing base is pulverised, a binder is mixed through to the specified depth, and the layer is compacted and trimmed to become a bound or modified pavement: stronger, stiffer, less moisture-sensitive, and designed to a strength class rather than just a thickness.
It's the most common stabilisation method on NSW roads, and most of Accurate's work.
Best suited for
Where it earns its place.
- 01Local governmentCouncils / ShiresSlag/lime blends at 3–5% on council base course, to council specification.
- 02Government & state infrastructureTfNSW / State roadsHeavily bound base above 4 MPa, to Transport for NSW specifications including R75.
- 03Civil & head contractorsInfrastructure / CivilMix design, UCS testing and density results delivered with the handover.
How we work with you
Full-service and part-service
Flexible ways to engage Accurate, depending on your project requirements.
Part-service
Plant and crew for the stabilisation step itself, working to your programme with your own resources alongside.
- Stabiliser, spreader truck and water cart
- Operators who know the plant
- Your compaction, trimming and surfacing
- The specialist step, on your dates
Binders
Which binder, which class
The binder and its rate set the strength, and the strength sets the design.
Improve workability, reduce moisture sensitivity
- UCS
- < 1 MPa
- Class
- Modified
- Typical binder
- 1–2% lime or cement
Moderate strength, flexible
- UCS
- 1–4 MPa
- Class
- Lightly bound
- Typical binder
- 2–4% slag/lime blend
High strength, rigid-behaving
- UCS
- > 4 MPa
- Class
- Heavily bound
- Typical binder
- 4–5% slag/lime or cement
Slag/lime blends (70/30, 50/50 or 40/60 ground granulated blast-furnace slag to lime) are the workhorse in NSW. The slag gives strength; the lime activates it and conditions the material. The blend sets slowly enough to allow trimming and gives less shrinkage cracking than straight cement. Most of Accurate's Wollongong City Council work used slag/lime at 3–5%.
Cement gains strength fast and high. It's the choice when a pavement needs to be trafficked quickly or when the material is clean granular with no clay to condition. Shrinkage is managed with prompt sealing and, on larger areas, construction joints.
To specification
How it's verified
Accurate works to Austroads pavement design (AGPT04D, stabilised materials), Transport for NSW specifications including R75, and council specifications where they differ. The results come with the handover.
Mix design
Binder rates are confirmed by laboratory mix design.
UCS testing
Strength is verified by UCS testing on site samples.
Density
Density by nuclear gauge.
FAQs
Common questions.
01How deep is base-course stabilisation?
Base-course stabilisation is normally 200–350mm. Below 200mm there isn't enough material to bind into a structural layer. Above 350mm is deep-lift territory. The depth is set by the pavement design, the traffic, and what's actually in the ground. Shallow services along a street will limit it; Rothery Street at Bellambi was mixed at 350mm around them.
Enquiries, tender requests or specifications
Enquire about your next base-course stabilisation project
Call (02) 4942 6100 or send the road and the problem.
Contact Info
- (02) 4942 6100
- quotes@accuratestabilising.com.au
- 66 Kalaroo Rd, Redhead NSW 2290
- Mon–Fri 7:00am – 5:00pm