Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers
The effects of curing temperature, blast furnace slag content, and Ms on the initial and final setting times, and compressive strengths of geopolymer paste and mortars are examined. The present work demonstrates that ambient-cured geopolymer pastes and mortars can be fabricated without requiring hig...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/10/10/920 |
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| author | Supphatuch Ukritnukun Pramod Koshy Aditya Rawal Arnaud Castel Charles Christopher Sorrell |
| author_facet | Supphatuch Ukritnukun Pramod Koshy Aditya Rawal Arnaud Castel Charles Christopher Sorrell |
| author_sort | Supphatuch Ukritnukun |
| collection | DOAJ |
| description | The effects of curing temperature, blast furnace slag content, and Ms on the initial and final setting times, and compressive strengths of geopolymer paste and mortars are examined. The present work demonstrates that ambient-cured geopolymer pastes and mortars can be fabricated without requiring high alkalinity activators or thermal curing, provided that the ratios of Class F fly ash (40–90 wt%), blast furnace slag (10–60 wt%), and low alkalinity sodium silicate (Ms = 1.5, 1.7, 2.0) are appropriately balanced. Eighteen mix designs were assessed against the criteria for setting time and compressive strength according to ASTM C150 and AS 3972. Using these data, flexible and reproducible mix designs in terms of the fly ash/slag ratio and Ms were mapped and categorised. The optimal mix designs are 30–40 wt% slag with silicate modulus (Ms) = 1.5–1.7. These data were used to generate predictive models for initial and final setting times and for ultimate curing times and ultimate compressive strengths. These projected data indicate that compressive strengths >100 MPa can be achieved after ambient curing for >56 days of mixes of ≥40 wt% slag. |
| first_indexed | 2024-03-10T15:32:13Z |
| format | Article |
| id | doaj.art-2040974615034b78b708a550b4aa7740 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-10T15:32:13Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-2040974615034b78b708a550b4aa77402023-11-20T17:30:19ZengMDPI AGMinerals2075-163X2020-10-01101092010.3390/min10100920Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based GeopolymersSupphatuch Ukritnukun0Pramod Koshy1Aditya Rawal2Arnaud Castel3Charles Christopher Sorrell4School of Materials Science and Engineering, UNSW Sydney, Sydney 2052, AustraliaSchool of Materials Science and Engineering, UNSW Sydney, Sydney 2052, AustraliaNMR Facility, Mark Wainwright Analytical Centre, UNSW Sydney, Sydney 2052, AustraliaSchool of Civil and Environmental Engineering, UNSW Sydney, Sydney 2052, AustraliaSchool of Materials Science and Engineering, UNSW Sydney, Sydney 2052, AustraliaThe effects of curing temperature, blast furnace slag content, and Ms on the initial and final setting times, and compressive strengths of geopolymer paste and mortars are examined. The present work demonstrates that ambient-cured geopolymer pastes and mortars can be fabricated without requiring high alkalinity activators or thermal curing, provided that the ratios of Class F fly ash (40–90 wt%), blast furnace slag (10–60 wt%), and low alkalinity sodium silicate (Ms = 1.5, 1.7, 2.0) are appropriately balanced. Eighteen mix designs were assessed against the criteria for setting time and compressive strength according to ASTM C150 and AS 3972. Using these data, flexible and reproducible mix designs in terms of the fly ash/slag ratio and Ms were mapped and categorised. The optimal mix designs are 30–40 wt% slag with silicate modulus (Ms) = 1.5–1.7. These data were used to generate predictive models for initial and final setting times and for ultimate curing times and ultimate compressive strengths. These projected data indicate that compressive strengths >100 MPa can be achieved after ambient curing for >56 days of mixes of ≥40 wt% slag.https://www.mdpi.com/2075-163X/10/10/920geopolymersambient curinglow alkalinitysetting timecompressive strength |
| spellingShingle | Supphatuch Ukritnukun Pramod Koshy Aditya Rawal Arnaud Castel Charles Christopher Sorrell Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers Minerals geopolymers ambient curing low alkalinity setting time compressive strength |
| title | Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers |
| title_full | Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers |
| title_fullStr | Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers |
| title_full_unstemmed | Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers |
| title_short | Predictive Model of Setting Times and Compressive Strengths for Low-Alkali, Ambient-Cured, Fly Ash/Slag-Based Geopolymers |
| title_sort | predictive model of setting times and compressive strengths for low alkali ambient cured fly ash slag based geopolymers |
| topic | geopolymers ambient curing low alkalinity setting time compressive strength |
| url | https://www.mdpi.com/2075-163X/10/10/920 |
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