Development of non-sintered zero-OPC binders using circulating fluidized bed combustion ash
- Authors
- Kang, Yong Hak; Choi, Young Cheol
- Issue Date
- 30-Jul-2018
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Fluidized bed combustion ash; Fly ash; Non-sintering binder; Zero-OPC binder
- Citation
- CONSTRUCTION AND BUILDING MATERIALS, v.178, pp.562 - 573
- Journal Title
- CONSTRUCTION AND BUILDING MATERIALS
- Volume
- 178
- Start Page
- 562
- End Page
- 573
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/3559
- DOI
- 10.1016/j.conbuildmat.2018.05.184
- ISSN
- 0950-0618
- Abstract
- The aim of this study was to develop zero-OPC binders using two circulating fluidized bed combustion (CFBC) boiler ashes with different free-CaO contents. For this purpose, heat of hydration, setting time, compressive strength, microstructure assessment, and thermal analysis tests were conducted to analyze the effect of changing the mixture of zero-OPC binder on the hydration characteristics. Furthermore, the use of mineral admixtures such as fly ash, silica fume, and ground-granulated blast-furnace slag (GGBS) to improve the material's strength was investigated. The hydration products of the zero-OPC binder were ettringite, portlandite, and calcium silicate hydrates components, which are similar to those of existing cements. From the test results, it was found that an optimal free-CaO content of 9.0%-17.0% ensured appropriate compressive strength and setting characteristics. Pre-hydration of CFBC ashes was found to effectively control the amount of free-CaO. The effect of mineral admixtures on improvements in strength confirmed that the CFBC ash-based zero-OPC binder is a highly promising alternative to existing cements. (C) 2018 Elsevier Ltd. All rights reserved.
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