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Development of cementless ultra-high performance fly ash composite (UHPFC) using nucleated pozzolanic reaction of low Ca fly ash
Cited 15 time in
Web of Science
Cited 16 time in Scopus
- Authors
- Issue Date
- 2022-09
- Publisher
- Pergamon Press Ltd.
- Citation
- Cement and Concrete Composites, Vol.132, p. 104650
- Abstract
- © 2022 Elsevier LtdThis study developed ultra-high performance fly ash composite (UHPFC) by enhancing the pozzolanic reactivity of low-calcium fly ash (FA). Although it did not include Portland cement, the composite exhibited outstanding performance in workability, mechanical properties, and strength development. At room temperature (20 °C), the hydrated lime-activated FA containing silica fume showed a distinct acceleration period. Moreover, 3 days of steam curing at 60 °C guaranteed its final strength (∼110 MPa) before 7 days because of the synergistic effect between the ultrafine filler and steam curing. At 60 °C, the reactivity of FA was dramatically improved only when nucleation sites were provided by silica fume. Furthermore, increasing the curing temperature reciprocally affected FA and silica fume in the reaction; while FA was a leading participant in the pozzolanic reaction, silica fume mostly played a role as a physical filler, providing the nucleation site for reaction products.
- ISSN
- 0958-9465
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