Returned concrete is the residual amount of fresh concrete that is not placed at the job site and returns to the ready-m......

During the hydration of cement tricalcium aluminate (C3A) reacts with gypsum and forms Ettringite (AFt).Once all gypsum ......

Calcium sulphate(e.g.gypsum)is the common set regulator in Portland cement.It has been shown that ground clinker can be ......