Abstract
ABSTRACT: Researchers are focusing their attention on alternative binder systems using 100% supplementary cementitious materials as it allows better control over the microstructure formation and low to moderate environmental footprint. One such system being considered is alkali activated slag concretes (AASC), made by adding alkalis such as sodium hydroxide and sodium silicate to ground granulated blast furnace slag (GGBS). Whilst they have a similar behaviour as that of traditional cement systems in terms of strength and structural behaviour, AASC are reported to exhibit superior performance in terms of abrasion,acid resistance and fire protection.
In this article, the authors investigate chloride ingress into different grades of AASC. The mix variables in AASC included water to binder, and binder to aggregate ratio, percentage of alkali and the SiO2/Na2O ratio (silica modulus, Ms). The first challenge was to develop mixes for different range of workability (with slump values from 40mm to 240mm) and reasonable early age and long term compressive strength. Further chloride ingress into those mixes were assessed and compared with the data from normal concretes based on literature. Findings show that compared to the PC concretes, the AAS concretes have lower rate of chloride ingress.
In this article, the authors investigate chloride ingress into different grades of AASC. The mix variables in AASC included water to binder, and binder to aggregate ratio, percentage of alkali and the SiO2/Na2O ratio (silica modulus, Ms). The first challenge was to develop mixes for different range of workability (with slump values from 40mm to 240mm) and reasonable early age and long term compressive strength. Further chloride ingress into those mixes were assessed and compared with the data from normal concretes based on literature. Findings show that compared to the PC concretes, the AAS concretes have lower rate of chloride ingress.
Original language | English |
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Title of host publication | Proceedings of Civil Engineering Research in Ireland Conference, Galway, Ireland, 29-30 August 2016 |
Editors | Jamie Goggins |
Publisher | CERAI |
Pages | 265-270 |
Number of pages | 6 |
ISBN (Print) | 978-0-9573957-2-5 |
Publication status | Published - 29 Aug 2016 |
Event | Civil Engineering Research in Ireland Conference 2016 - Engineering Building, NUI, Galway, Ireland Duration: 29 Aug 2016 → 30 Aug 2016 http://www.cerai.net/ |
Conference
Conference | Civil Engineering Research in Ireland Conference 2016 |
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Country/Territory | Ireland |
City | Galway |
Period | 29/08/2016 → 30/08/2016 |
Internet address |
Bibliographical note
Proceedings of CERI 2016: Civil Engineering Research Ireland, Nanukuttan S. and Goggins J. (eds), National University of Ireland GalwayKeywords
- alkali activated slag concretes
- cement less binders
- workability optimisation
- chloride environment
- chloride resistance