Stages of Quality Control:

Quality Control Prior to Construction

In this stage, properties and testing of constituent materials of concrete are done. Mainly cement and aggregates are tested for required physical and chemical properties and their suitability of a particular concrete is ascertained. Properties of aggregates such as size, shape, strength, texture, bulk density, specific gravity, water absorption, soundness, bulking of sand and durability are found and tested in laboratory. Physical properties of cement and chemical composition of cement are found out and cements suitability is decided after matching these properties with standard specifications. An Effect of aggregate properties on strength of concrete is also studied.