Three-quarter inch chippings
The workhorse stone of Kano building sites. Clean, angular, single sized granite for slabs, footings and general concrete.
The material
Crushed stone base is not one size. It is a blend that runs smoothly from 40 mm stone down to dust, so the small pieces fill the gaps between the large ones and the whole layer becomes almost as hard as rock once it is rolled.
It sits on a compacted laterite subgrade and under asphalt, interlocking pavers or a concrete slab. Done properly it stops the potholes and soft spots that appear after the first rainy season.
For estate roads we work with the contractor on a trial strip first, rolling a few metres and checking density, so the main job is right from the first truck.
“A graded mix from 40 mm down to dust that locks together under a roller. The base under estate roads, yards and driveways.”From the Granite Peak spec sheet
Order this material
₦14,000 a tonne
At the weighbridge, example rate. Add haulage by zone. Minimum load ten tonnes.
Specification
The numbers
Typical values from our weekly testing. The test sheet for your batch comes with the delivery ticket. Example data for this demo.
- Size
- 0 to 40 mm, graded
- Passing 4.75 mm
- 32 to 55 per cent
- Plasticity
- Non plastic
- Compacted density
- about 2.2 t per m³
- Layer depth
- 150 to 250 mm
- Compaction
- Vibrating roller, 6 to 8 passes
In use
Where it goes
The jobs our customers use it for most often.
Estate access roads
200 mm under asphalt or pavers.
Warehouse and depot yards
250 mm for trucks and forklifts.
Home driveways
150 mm under pavers or a slab.
Filling station forecourts
Under the concrete apron, with an engineer’s design.
Photos for this demo.
Questions
Asked at the weighbridge
How much base for my driveway?
A 60 square metre driveway at 150 mm takes about 20 tonnes once compacted, which is one 20-tonne tipper. The calculator does the sum.
Can I spread it by hand?
Yes for small jobs, but it must be compacted with a plate or roller in layers no thicker than 150 mm.
Should it be wet when rolled?
Damp, not wet. Our drivers can bring a water bowser for big jobs on request.
What goes under it?
Usually a compacted laterite subgrade. If the ground is soft, a layer of boulders first.
Related materials
Quarry dust
The fine stone left by crushing. Block makers mix it with sharp sand for harder, squarer six-inch and nine-inch blocks.
Next step
Size it, book it
Run your site through the calculator, then pick a delivery window. Or call sales on +234 800 000 1011. Example details for this demo.