Three-quarter inch chippings
The workhorse stone of Kano building sites. Clean, angular, single sized granite for slabs, footings and general concrete.
The material
Quarry dust used to be the part of the pile nobody wanted. Now it is one of our busiest lines, because block makers found that a dust and sharp sand mix gives a denser block that breaks less on the way to site.
It is not a full replacement for sand in concrete. Its very fine particles soak up water and cement, so we recommend it for blocks, paver bedding and backfill, not for structural slabs.
In the rainy season the dust holds water, and a damp tonne contains less stone than a dry one. We price by weight on our bridge, so ask the dispatcher about moisture if you are measuring by volume.
“The fine stone left by crushing. Block makers mix it with sharp sand for harder, squarer six-inch and nine-inch blocks.”From the Granite Peak spec sheet
Order this material
₦9,500 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 5 mm
- Passing 75 microns
- 5 to 18 per cent
- Silt by washing
- about 11 per cent, example
- Bulk density, loose
- about 1.6 t per m³
- Colour
- Light grey
- Moisture at loading
- Dry season dry, rainy season damp
In use
Where it goes
The jobs our customers use it for most often.
Six and nine-inch blocks
Mix about two parts dust to one part sharp sand, three bags of cement per hundred six-inch blocks, as an example.
Interlocking paver bedding
A 30 mm screeded layer under pavers, compacted with a plate.
Pipe bedding and backfill
Around water and drainage pipes in trenches.
Floor screed fill
For non-structural fills under tiles, with care.
Photos for this demo.
Questions
Asked at the weighbridge
Can I use only quarry dust for blocks?
Some moulders do, but the blocks are harder to cure evenly. A blend with sharp sand is more forgiving.
Why is quarry dust so cheap?
It comes out of the crusher whatever we make. The price covers loading and testing, not the stone.
Do you deliver dust on the same truck as chippings?
Not mixed in one bed. A trailer can carry two materials only if they are separated by a board, which some drivers do on request.
Is it safe to breathe?
Fine stone dust should not be breathed in. Wet the pile lightly before mixing and give your workers dust masks.
Related materials
Crushed stone base
A graded mix from 40 mm down to dust that locks together under a roller. The base under estate roads, yards and driveways.
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.