CONCRETE - Part 2 - Construction Materials
N.C.T. CIVIL ENGINEERING (NVQ LEVEL 5) CONSTRUCTION MATERIAL (SEMESTER 01) සරලවම....... සිංහල පැහැදිලි කිරීමක් එක්ක....... CEMENT Chemical Compostion Portland cement is composed of four basic chemical compounds Dicalcium Silicate - Hardens slowly and its effect of strength increases and occurs at ages beyond one week Tricalcium Silicate - Rapid strength gain and responsible for initial setting and early strength Tricalcium Aluminate - Strength development in the first few days and quick setting Tricalcium Aluminaferrite - Little contribution for setting or strength and responsible for lowering the clinkering temperature and gray colour of cement Aggregates For Concrete Aggregates are used in concrete for the following reasons To gain higher strength To reduce shrinkage of concrete To reduce cost by reducing the amount of cement To reduce heat out-put and hence reduce thermal stresses කොන්ක්රීට් නිෂ්පාදනයට සියුම් සහ රලු සමහරක පාවිච්චි කරන්...