Cement Energy and Environment

• The sulphate concentration in cement samples REFERENCES containing 5% jarosite was found to be lower as compared to 5% mineral gypsum. However, the increase in setting time was due to increase in formation of amorphous ettringite on account of higher alkalinity. • Compressive strength achieved at 3, 7 and 28 days of the cement mortar samples containing 100% jarosite and mineral gypsum was found to be comparable. • OPC containing 100% jarosite was found to be resistant to chloride and sulphatic environmental conditions up to the period of 6 months. ACKNOWLEDGEMENT The work reported in this paper forms a part of study sponsored by M/s Binani Zinc Limited, Kochi, Kerala, India under the programme of waste utilization. The authors are thankful to Director General, National Council for Cement and Building Materials (NCB) for allowing publication of the paper. 1. Agarwal S K, Ali M M, Pahuja Ashwani et al (2015), "Investigations on the Role of Zinc Industry By-product "Jarosite" as Set Controller in OPC and PPC", 14 1h International Congress on the Chemistry of Cement, Hydration of Portland Cement , FSN-1444, Abstract Book Volume-1, p.122, 13-16 October 2015, Beijing, China 2. Ali M.M, Agarwal S K, Pahuja Ashwani et al (2014), "Zinc Industry By-product for Gypsum Substitute", World Cement, November 2014, p. 141-146. 3. IS:269-2015, "Ordinary Portland Cement– Specification" 4. Javed, I.B (1987), "Thermal monitoring of flash setting in Portland cement clinkers", Thermochimica Acta, 119, No. 2, pp.235-241 5. Locher F.W, Richartz W and Sprung S (1980) , "Setting of cement Part-2: Effect of adding calcium sulphate", Zem.Kalk.Gips , 33 (6), p.271. 6. Suresh. K, Sharma J.M, Kuchya.M et.al (2012), "Jarosite waste as a possible alternative to gypsum in Portland cement manufacture", Cement International, 10(4),p.91-97 ••••• 24 • ' / j