Class 3 20mm Crushed Rock
Victoria’s go-to sub-base, dense-graded crushed rock for the layer that carries the base, and for half the trenches in Melbourne.
About this product
Class 3 20mm is the standard sub-base under VicRoads pavement designs and the most-ordered crushed rock in civil drainage and utility work. Slightly relaxed grading and plasticity limits against Class 2 make it economical, while still compacting into a dense, stable platform.
Beyond pavements it’s the default material for trench reinstatement over services, working platforms over soft ground, and sub-base under slabs and footpaths. Supplied from accredited quarries, or as recycled Class 3 crushed concrete where the spec allows, with every delivery digitally docketed.
Specifications
| Material type | Fully crushed rock (FCR), dense-graded |
|---|---|
| Nominal size | 20mm |
| Specification | Supplied to VicRoads Section 812, Class 3 |
| Grading | Continuously graded, 20mm down to fines, within the Section 812 envelope |
| Source rock | VicRoads-accredited hard rock (typically basalt or hornfels) |
| Treatment options | Plain, wet-mix (at optimum moisture), or cement treated 1% to 4% |
| Typical compacted density | ~2.0 to 2.2 t/m³ (indicative) |
| Common uses | Pavement sub-base, fill, working platforms |
Figures shown are the supply specification and indicative typical properties. Source rock and exact test values vary by quarry; current batch test certificates for your delivery are available on request.
Use cases
Supply & delivery
Tipper & truck and trailer
Full loads to open sites, sized to your access and the day's program.
Truck & quad
Maximised payload where site access and mass limits allow it.
Live in NXT Control
Every load GPS-tracked from the weighbridge to your gate, with the tonnes on the docket.
Plain, wet-mix or CTCR
Supplied as is, wet-mixed at optimum moisture, or cement treated to your design.
How much do you need?
As a guide, this material weighs around 2.1 tonnes per cubic metre. Multiply your area by the layer depth to get the volume, then by the density. Tell us the area and depth on the quote form and we will convert it to tonnes and price the delivery for you.
100 m² at 150 mm deep = 15 m³ × ~2.1 t/m³
Common questions
Is this supplied to VicRoads specification?
Can it be cement treated or wet-mixed?
How is it delivered, and can I track it?
Need rates for Class 3 20mm Crushed Rock?
Tell us the volume, the site and the program. Every load is tracked live through NXT Control, from quarry to your gate.