Micro-structural development of gap-graded blended cement pastes containing a high amount of supplementary cementitious materials |
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| Authors: | Tongsheng Zhang Qijun Yu Jiangxiong Wei Peng Gao Peixin Chen Jie Hu |
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| Affiliation: | 1. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, 14071 Córdoba, Spain;2. Departamento de Química, Facultad de Ciencias, Universidad de Navarra, C/Irunlarrea s/n, 31080 Pamplona (Navarra), Spain;3. Grupo Puma S.L., Avda. Agrupación Córdoba no. 17, Córdoba, Spain;1. Université de Sherbrooke, Department of Civil and Building Engineering, Sherbrooke, Québec, Canada;2. Laboratory L2MGC, University of Cergy-Pontoise, 95000 Cergy-Pontoise, France;1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2. Jiangsu Research Institute of Building Science Co., Ltd, Nanjing 211100, China;3. State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 211100, China;1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;2. State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China;3. WUT-UC Berkeley Joint Laboratory on Concrete Science and Technology, Wuhan 430070, China;4. School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China;1. School of Materials Science and Engineering, South China University of Technology, 510640, Guangzhou, China;2. Guangdong Low Carbon Technology and Engineering Center for Building Materials, 510640, Guangzhou, China;3. Guangdong Wanyin Technology Development Co. Ltd, 510075, Guangzhou, China;1. Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;2. College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;3. Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province, School of Civil Engineering & Mechanics, Yanshan University, Qinhuangdao 066004, China |
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| Abstract: | To clarify the strength improvement mechanism of gap-graded blended cements with a high amount of supplementary cementitious materials, phase composition of hardened gap-graded blended cement pastes was quantified, and compared with those of Portland cement paste and reference blended cement (prepared by co-grinding) paste. The results show that the gap-graded blended cement pastes containing only 25% cement clinker by mass have comparable amount of gel products and porosity with Portland cement paste at all tested ages. For gap-graded blended cement pastes, about 40% of the total gel products can be attributed to the hydration of fine blast furnace slag, and the main un-hydrated component is coarse fly ash, corresponding to un-hydrated cement clinker in Portland cement paste. Further, pore size refinement is much more pronounced in gap-graded blended cement pastes, attributing to high initial packing density of cement paste (grain size refinement) and significant hydration of BFS. |
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