combination, or concrete mix, will be poured and harden into the durable material with which we are all familiar. There are three basic ingredients in the concrete mix: Portland Cement Water Aggregates (rock and sand) Portland Cement The cement and water form a paste that coats the aggregate and sand in the mix.
The longer the concrete is kept moist, the stronger and more durable it will become. The rate of hardening depends upon the composition and fineness of the cement, the mix proportions, and the moisture and temperature conditions. Concrete continues to get stronger as it gets older.