Good concrete starts with good aggregate. Cement is the binder, but it is the aggregate that builds the load-bearing skeleton.
Four critical effects
- Volume: ~70% of concrete is aggregate, so any error is magnified in proportion.
- Water demand: poor grading needs more water, and every extra litre lowers strength.
- Bond: clay and dust on the surface stop the cement paste from adhering.
- Dimensional stability: suitable aggregate reduces shrinkage and cracking.
Why does grading matter?
A good mix balances different sizes so as to minimise voids. The fewer the voids, the less cement paste — and therefore less water — is needed for the same workability.
Aggregate without a sieve analysis is concrete without control. Ask your supplier for regular sieve analyses and washing-loss reports.
Clay and fines
Clay coats the particle surface, lowering bond and raising water demand. That is why we wash the aggregate at the plant and keep the fines content within standard limits.
Fixed source = consistent concrete
Change the quarry and the grading changes with it. Supply fed from a fixed quarry means a mix that stays consistent. See products for our fractions and operations for our facilities.
