Optimizing Precursors and Reagents for the Development of Alkali-Activated Binders in Ambient Curing Conditions
| Autor: | Dhruv Sood, Khandaker M. A. Hossain |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Curing (food preservation) microstructure 0211 other engineering and technologies ambient curing 02 engineering and technology supplementary cementitious materials (SCMs) lcsh:Technology chemistry.chemical_compound geopolymers 021105 building & construction lcsh:Science Engineering (miscellaneous) alkali-activated binders Calcium hydroxide lcsh:T Calcium aluminosilicate 021001 nanoscience & nanotechnology Compressive strength chemistry Chemical engineering Ground granulated blast-furnace slag Fly ash Ceramics and Composites lcsh:Q Cementitious strength 0210 nano-technology Ternary operation powder-based reagents |
| Zdroj: | Journal of Composites Science, Vol 5, Iss 59, p 59 (2021) Journal of Composites Science Volume 5 Issue 2 |
| ISSN: | 2504-477X |
| DOI: | 10.3390/jcs5020059 |
| Popis: | Alkali-activated binders (AABs) are developed through the activation of aluminosilicate-rich materials using alkaline reagents. The characteristics of AABs developed using a novel dry-mixing technique incorporating powder-based reagents/activators are extensively explored. A total of forty-four binder mixes are assessed in terms of their fresh and hardened state properties. The influence of mono/binary/ternary combinations of supplementary cementitious materials (SCMs)/precursors and different types/combinations/dosages of powder-based reagents on the strength and workability properties of different binder mixes are assessed to determine the optimum composition of precursors and the reagents. The binary (55% fly ash class C and 45% ground granulated blast furnace slag) and ternary (25% fly ash class C, 35% fly ash class F and 40% ground granulated blast furnace slag) binders with reagent-2 (calcium hydroxide and sodium sulfate = 2.5:1) exhibited desired workability and 28-day compressive strengths of 56 and 52 MPa, respectively. Microstructural analyses (in terms of SEM/EDS and XRD) revealed the formation of additional calcium aluminosilicate hydrate with sodium or mixed Ca/Na compounds in binary and ternary binders incorporating reagent-2, resulting in higher compressive strength. This research confirms the potential of producing powder-based cement-free green AABs incorporating binary/ternary combinations of SCMs having the desired fresh and hardened state properties under ambient curing conditions. |
| Databáze: | OpenAIRE |
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