What are the mixture design characteristics of the High Slag Cement Concrete (with GGBS content more than 50%)?

Due to the fact that the fineness of GGBS is far higher than OPC (e.g. GGBS: 420-450m2/kg, OPC: 330-350m2/kg), as compared to the plain concrete, the High Slag Cement Concrete requires a water content increase of 5%;When the user design the mixture of the concrete, he has to fulfill the workability and strength requirement of the concrete by adjusting the amount of additives used, and should not increase the amount of water used as he wishes;

Similar to the normal concrete, the mixture design of the High Slag Cement Concrete should go through the following steps by the relevant technical staffs: The preliminary concrete mix design Trial mixing in the laboratory

Trial mixing on the site