You may also consider use of curing compounds. Proper curing helps in reduction of shrinkage cracks, imparts greater abrasion resistance to surface, reduces permeability and improves carbonation resistance.
Globally PPC's have proved their superiority over OPC. Blended cements have become the perferred choice of the engineering franternity. "Kotai Cement" is a versatile alternative for OPC and can replace it in most applications with added advantage.