Why granite aggregate? The case for crushed granite in construction

Crushed granite is the workhorse aggregate of serious construction in northern Ghana. Its physical properties — hardness, density and the angular shape of the crushed particle — make it well suited to the loads roads and structures have to carry. This article explains what to look for and why the source rock matters.

What makes granite a good construction aggregate?

Granite is an igneous rock with high compressive strength and low water absorption. Crushing it produces angular, interlocking particles that bind well in concrete and asphalt and resist crushing under traffic. Compared with softer or rounded river material, crushed granite gives more predictable strength and better long-term durability.

Where is granite aggregate used?

• Structural concrete — 14mm to 20mm chippings for columns, beams and slabs.
• Roads — crusher-run for base and sub-base, smaller chippings for surface dressing and asphalt.
• Blocks and screeds — quarry dust as a fine aggregate for blockmaking and finishing.

How does Pwalugu granite compare?

The Pwalugu deposit is a Birimian muscovite-biotite granite — a hard, well-cemented rock that crushes to clean, strong chippings. Because it is quarried and graded locally, buyers in the Upper East and Northern regions avoid the long haul from southern sources, which lowers delivered cost and lead time. Pricing on this site is indicative; confirm by quote.