Chemical acceleration of a neutral granulated blast-furnace slag activated by sodium carbonate |
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| Affiliation: | 1. School of Earth Sciences and Engineering, Nanjing University,163 Xianlin Avenue, Nanjing 210023, China;2. Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, UK;3. School of Earth Sciences and Engineering, Hohai University, 1 Xikang Road, Nanjing 210098, China;1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, PR China;2. Department of Civil and Environmental Engineering, Brunel University London, Uxbridge, Middlesex UB8 3PH, United Kingdom;3. Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, PR China;4. Whitireia New Zealand, 450 Queen St, Auckland CBD, Auckland 1010, New Zealand;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, PR China;2. Department of the Built Environment, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands |
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| Abstract: | This paper presents results of a study on chemical acceleration of a neutral granulated blast-furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime. In all cements, the main hydration product is C–(A)–S–H, but its structure varies between tobermorite and riversideite depending on the accelerator used. Calcite and gaylussite are present in all systems and they were formed due to either cation exchange reaction between the slag and the activator, or carbonation. With accelerators, compressive strength up to 15 MPa can be achieved within 24 h in comparison to 2.5 MPa after 48 h for a mix without an accelerator. |
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