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  concrete is a product obtained artificially hardening of the mixture of cement,sand,gravel and water in y
predetermined proportions,when these ingredents are mixed,they form a plastic mass which can be poured in suitable moulds,called forms,and set on standing into hard solid mass.the chemical reactions of cement and water,in the mix,is relatively slow and requires time and favourable temaperature for its completion.this timeknown as setting time may be divided into three distinct  phase first phase,