What is Concrete? Composition & Types of Concrete
The paste hardens, binds the aggregates, and forms a stone-like substance. Aggregates. Sand is a fine mixture. Gravel or crushed stone is the coarse mixture in most mixes. Water. ... The usual proportion is 1:2:4 or 1:3:6. After mixing the required amounts of concrete materials, the mix is cured with water for 28 days for proper strength building.