Properties of quicklime(CaO)-activated Class F fly ash with the use of CaCl2
| Autor: | Woo Sung Yum, Jae Eun Oh, Yeonung Jeong, Dongho Jeon |
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| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Pore size Chemistry 0211 other engineering and technologies macromolecular substances 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Calcium oxychloride Volume (thermodynamics) Chemical engineering Fly ash 021105 building & construction Degradation (geology) General Materials Science 0210 nano-technology Dissolution Expansive |
| Zdroj: | Cement and Concrete Research. 111:147-156 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/j.cemconres.2018.05.019 |
| Popis: | This study reports the significant effect of CaCl2 on strength improvement in CaO-activated Class F fly ash system. In these systems, the presence of CaCl2 promotes (1) a higher degree of fly ash dissolution, (2) increasing C-S-H formation, and (3) an overall reduction of pore size and volume, resulting in increased strength. However, while more C-S-H, which is responsible for strength increase, was produced with higher CaCl2 content, extreme doses of CaCl2 resulted in strength degradation; more importantly, the best quantity of CaCl2 for the greatest strength was dependent on the water-to-binder weight ratio (w/b). This dependency was closely related to the formation of calcium oxychloride, which generally causes severe expansive cracking and depends on w/b. |
| Databáze: | OpenAIRE |
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