Constituents of Concrete:
•Cement + water = cement paste
•Cement + water + sand cement = mortar
•Cement + water + sand + lime = masonry mortar
•Cement + water + sand + coarse aggregate = concrete
Importance of Cement in Concrete:
A hydraulic cement capable of setting, hardening and remaining stable under water.The cement (dry powder of very fine particles) powder, when mixed with water, forms a paste.This paste acts like glue and holds or bonds the aggregates together.
The cement has as many as 1.1 x 10 12 particles per kilogram.
The amount of coal required to manufacture one tonne (2200lb) of cement is between 100 kg and 350 kg depending upon the process used.