Raw Material Of Concrete

Cement, lime, gypsum and other inorganic cementitious materials mix with water to make the concrete mixture malleable;The strength is then produced by chemical and physicochemical action of condensation and hardening.Generally speaking, drinking water can meet the requirements of concrete mixing water.Excess acid, alkali, salt and organic matter in water can have a harmful effect on concrete.Aggregate not only has filling function, but also has important influence on the properties of concrete such as bulk density, strength and deformation.Admixtures may be added to improve certain properties of concrete.Because of the obvious technical and economic effect of admixture, it has become an indispensable component of concrete.In order to improve the workability of concrete mixture or the performance of hardened concrete and save cement, fine mineral material (admixture) can also be added in concrete mixing.It is classified as active and inactive.The properties and quantity of admixtures affect the strength, deformation, hydration heat, impermeability and color of concrete.