Where can I buy bulk gravel and aggregate in Australia?+
Search MaterialSales by aggregate size or type and your town. Listings cover crushed rock / blue metal (5-75mm), pea gravel, river stones, drainage aggregate, decorative pebbles, scoria, marble and slate chips, with live prices and supplier contact details. Suppliers within ~150km of the searched town are surfaced.
How much does 20mm blue metal cost per tonne?+
20mm blue metal aggregate typically ranges from $50-95 per tonne ex-GST depending on rock type (basalt is premium, granite and limestone are common alternatives), location and load size. MaterialSales shows each supplier's live ex-GST price so you can compare.
What size aggregate do I need for concrete?+
Most ready-mix concrete uses 20mm aggregate as standard. 14mm is used in tighter sections and pump mix. 10mm and 7mm are used for finer finishes and exposed-aggregate work. 40mm is occasionally used for very large pours. The supplier or concrete plant will confirm the right size when you order.
What's the difference between drainage aggregate and crushed rock?+
Drainage aggregate is a clean, single-size graded rock (e.g. 20mm only) with no fines — water flows through it without clogging. Crushed rock (blue metal) is a graded mix that compacts firmly and includes fines. Drainage aggregate goes in French drains, soakwells and no-fines concrete; crushed rock goes in concrete and compactable applications.
How much does a cubic metre of gravel weigh?+
Typical bulk densities: blue metal / crushed rock ≈ 1.5 tonnes per cubic metre, pea gravel ≈ 1.6 t/m³, river stones ≈ 1.5 t/m³, scoria (lighter) ≈ 0.9 t/m³, marble and slate chips ≈ 1.4-1.6 t/m³. Confirm with the supplier — densities vary by source.