**5.2 Hardened properties**

A lot of studies detailed the impact of bentonite on the mechanical properties of hardened concrete. Compressive strength was measured at various periods of concrete. Resistance of cement was tried and detailed under different climatic conditions. Most studies revealed that lower qualities were seen by the addition of bentonite at early ages (3,7 and 28 days), the better exhibition displayed at later ages (56 and 90 days) of restoring similarly with control concrete.
