1. IS 269:33 Grade Ordinary Portland cement—specification
2. IS 8112: 43 Grade ordinary Portland cement—specification
3. IS 12269:53 Grade ordinary Portland cement—specification
4. IS 9103: Concrete admixtures—specification
5. Latha KS, Rao MVS, Reddy SV (2012) Estimation of GGBS and HVFA strength efficiencies in concrete with age. Int J Eng Adv Technol (IJEAT), 2(2), ISSN: 2249–8958, Dec 2012