Efficient utilization of cementitious materials to produce sustainable blended cement |
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| Authors: | Tongsheng Zhang Qijun Yu Jiangxiong Wei Pingping Zhang |
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| Affiliation: | 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;3. State Key Laboratory of High Performance Civil Engineering Materials, Sobute New Materials Co., Ltd., Nanjing 211103, China;4. Department of Civil, Architectural and Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;1. Lafarge Canada Inc., 334 Avro, Pointe Claire, QC H9R 5W5, Canada;2. Lafarge Centre de Recherche, 95 rue du Montmurier, 38291 St Quentin Fallavier, France;3. University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada;4. University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada;5. Lafarge North-America, 12018 Sunrise Valley Drive, Suite 500, Reston, VA 20191, USA |
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| Abstract: | To achieve sustainable development of cement industry, cementitious efficiency of different cement clinker and supplementary cementitious materials (SCMs) fractions, in terms of hydration process and strength contribution ratio, was characterized. The results show that blast furnace slag and steel slag should preferably be arranged in fine fractions due to their desirable hydration processes and high strength contribution ratios. Cement clinker should be positioned in intermediate fraction (8–24 μm) due to its proper hydration process. Replacement of cement clinker by SCMs with low activity or inert fillers in coarse fractions was also suggested, because coarse cement clinker fractions gave very low hydration degrees and little strength contribution. Both early and late properties of gap-graded blended cements prepared can be comparable with or higher than those of Portland cement, indicating both cement clinker and SCMs were used more efficiently. These blended cements also give additional cost savings and reduced environmental impact. |
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