Basics of Cement concrete

Basics of Cement concrete.    It get by mixing the following four ingredients in predetermined proportions. Cement.   Sand,  Gravel and  Water   Plastic mass  First Step - In a Concrete mixer when we mix the above four ingredients .  Second step - We get the plastic mass of concrete. To get a desired shape of concrete we poured the mix into a define shape of a mould.The plastic mass poured in Moulds, standing into hard solid mass.   Setting Time  The chemical reaction of cement, and in the mix, is slow  Chemical reaction requires time and favorable temperature for its completion.  This time, known as setting time. This Setting time  divided into three distinct phases.   The first phase.   The first phase is known as initial setting time.  It  requires from 30 minutes to about 60 minutes for completion.  During this phase, the mixed concrete decreases its plasticity  Mixed concrete develops pronounced resistance to flow.   The second phase  The second phase, known as final setting time.  It  may vary ·between 5 to 6…

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