Alkali-activation potential of biomass-coal co-fired fly ash |
| |
| Affiliation: | 1. School of Civil and Environmental Engineering, Georgia Institute of Technology, 790 Atlantic Dr., Atlanta, GA 30332-0355, USA;2. Department of Materials Science and Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin Street, Sheffield, S1 3JD, United Kingdom;3. Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield, S1 3JD, United Kingdom;1. Laboratory of Applied Inorganic Chemistry, Faculty of Science, University of Yaoundé I, P.O Box 812, Yaoundé, Cameroon;2. Laboratory of Materials, Local Materials Promotion Authority, MINRESI/MIPROMALO, P.O. Box 2396, Yaoundé, Cameroon;3. Department of Engineering "Enzo Ferrari", University of Modena and Reggio Emilia, ViaP. Vicarelli 10, 41125 Modena, Italy;4. Department Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;5. Research Unit of Noxious Chemistry and Environmental Engineering, University of Dschang, Faculty of Science, Department of Chemistry, P.O. Box 67, Dschang, Cameroon;1. Department of Materials Science and Engineering, MIT, Cambridge, USA;2. Department of Civil and Environmental Engineering, MIT, Cambridge, USA;1. Department of Civil Engineering/CICECO, University of Aveiro (UA), 3810-193 Aveiro, Portugal;2. Mobility Engineering Center, Federal University of Santa Catarina (UFSC), 89218-000 Joinville, SC, Brazil;3. ESTG, Polytechnic Institute of Viana do Castelo, Viana do Castelo, Portugal;4. Materials and Ceramics Engineering Department/CICECO, University of Aveiro, 3810-193 Aveiro, Portugal;5. Interface Analysis Centre, University of Bristol, 121 St Michael''s Hill, Bristol BS2 8BS, UK;1. Dept. of Civil Eng., University of Sherbrooke, Sherbrooke, QC, Canada;2. Dept. of Civil Eng., Faculty of Engineering, University of Minoufia, Egypt |
| |
| Abstract: | Co-fired fly ash, derived from the co-combustion of coal and biomass, is examined as a potential precursor for geopolymers. Compared to a coal fly ash, two co-fired fly ashes have a lower vitreous content and higher carbon content, primarily due to differing combustion processing variables. As a result, binders produced with these co-fired fly ashes have reduced reaction potential. Nevertheless, compressive strengths are generally highest for all ashes activated with solutions with a molar ratio of SiO2/(Na2O + K2O) = 1, and these mixes reach the highest extent of reaction among those studied. Activation with sodium hydroxide solution forms zeolitic phases for all ashes. The thermal and dilatometric behavior of the coal and co-fired fly ash geopolymers is similar between equivalent mix designs. These results indicate that co-fired fly ashes can be viably used to form alkali-activated geopolymers, which is a new beneficial end-use for these emerging waste materials. |
| |
| Keywords: | Fly ash Biomass Geopolymer Strength Characterization Microscopy |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
