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- Oh, Jae Eun
- Nano-AIMS Structural Materials Lab.
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The temperature-dependent action of sugar in the retardation and strength improvement of Ca(OH)2-Na2CO3-activated fly ash systems through calcium complexation
- Author(s)
- Jeon, Dongho, Yum, Woo Sung, Song, Haemin, Sim, Sungwon, Oh, Jae Eun
- Issued Date
- 2018-11
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.190, pp.918 - 928
- Abstract
- This study reports the temperature-dependent strength improvement and retardation in Ca(OH)2-Na2CO3-activated fly ash binders with sugar. Without sugar, the system exhibited rapid stiffening due to the calcite formation. The addition of sugar clearly removed the false set; however, at room temperature, it retarded strength development because the calcium complexation of sugar inhibits the dissolved calcium ions from participating in calcite and C-S-H formation. However, at 90 °C, the use of sugar significantly improved the compressive strength by increasing the (1) degree of dissolution of fly ash and Ca(OH)2, (2) C-S-H formation, and (3) reduction of overall pore size and volume.
- Publisher
- ELSEVIER SCI LTD
- ISSN
- 0950-0618
- Keyword (Author)
- Ca(OH)2-activation, Calcium complexation, Cementless binder, Class F fly ash, Sugar
- Keyword
- CEMENT PASTES, PORE SOLUTION, HYDRATION, MICROSTRUCTURE, SOLUBILITY, CARBONATE, PRODUCTS, CONCRETE, BINDER
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