Compressive strength and microstructural characteristics of class C fly ash geopolymer |
| |
| Authors: | Xiaolu Guo Huisheng Shi Warren A. Dick |
| |
| Affiliation: | 1. Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, 1239 Siping Road, Shanghai 200092, China;2. School of Environment and Natural Resources, The Ohio State University, 1680 Madison Avenue, Wooster, OH 44691-4096, USA;1. Department of Chemical and Biomolecular Engineering, University of Melbourne, Victoria 3010, Australia;2. Faculty of Engineering, Universiti Malaysia Sarawak, Kota Samarahan 94300, Sarawak, Malaysia;3. Department of Materials Science and Engineering, University of Sheffield, Sir Robert Hadfield Building, Mappin St., Sheffield S1 3JD, United Kingdom;4. Zeobond Pty. Ltd., P.O. Box 23450, Docklands, Victoria 8012, Australia |
| |
| Abstract: | Geopolymers prepared from a class C fly ash (CFA) and a mixed alkali activator of sodium hydroxide and sodium silicate solution were investigated. A high compressive strength was obtained when the modulus of the activator viz., molar ratio of SiO2/Na2O was 1.5, and the proper content of this activator as evaluated by the mass proportion of Na2O to CFA was 10%. The compressive strength of these samples was 63.4 MPa when they were cured at 75 °C for 8 h followed by curing at 23 °C for 28 d. In FTIR spectroscopy, the main peaks at 1036 and 1400 cm?1 have been attributed to asymmetric stretching of Al–O/Si–O bonds, while those at 747 cm?1 are due to the Si–O–Si/Si–O–Al bending band. The main geopolymeric gel and calcium silicate hydrate (C–S–H) gel co-exist and bond some remaining unreacted CFA spheres as observed in XRD and SEM–EXDA. The presence of gismondine (zeolite) was also observed in the XRD pattern. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
