Strength of Concrete vs Grades of Cement
Portland Pozzolana cements as per IS: 1489 (part – I) were produced for durability of structure rather than for higher strength. Since all the available PPCs are giving high strength, it is high time that the manufactures grade their PPCs. References. IS 8112: 1989 (Reaffirmed 2005) "Specification for 43 grade ordinary Portland cement."