On the P mix, the number after the P signifies the kilograms of cement per cubic metre in each mix. e.g. P180 = 180kg of cement per cube. The higher the number, the higher the cement content, resulting in a stronger concrete.
On the C mix, the number after the C signifies the average Newton strength after 28 days.e.g. C25/30 = 25/30 Newtons after 28 days. The higher the number, the higher the newton strength, resulting in a stronger concrete.
It is also possible to introduce additional materials and chemicals into the mix if special qualities are required.
Fibres – to help prevent early induced cracking
Water Reducing Admixture (WRA) – additive which helps to speed up the curing process by reducing the amount of water used, meaning the concrete can begin to cure faster than usual, and ultimately create a stronger product.
Retardant – to help slow down the setting time of screeds, giving you more time to work.
10mm Aggregate – A reduced stone size