The Role of Water Content and Paste Proportion on Physico-mechanical Properties of Alkali Activated Fly Ash–Ggbs Concrete
| Autor: | Marios Soutsos, Raffaele Vinai, Ali Rafeet, Wei Sha |
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| Rok vydání: | 2015 |
| Předmět: |
0211 other engineering and technologies
Building material Sodium silicate 02 engineering and technology Environmental Science (miscellaneous) engineering.material Raw material setting time 12. Responsible consumption law.invention chemistry.chemical_compound alkali activated concrete law 11. Sustainability 021105 building & construction mix design Water content activated slag Waste management 9. Industry and infrastructure slag valorisation Metals and Alloys 021001 nanoscience & nanotechnology Portland cement chemistry Pulverised fuel ash Mechanics of Materials Ground granulated blast-furnace slag Fly ash engineering Environmental science 0210 nano-technology |
| Zdroj: | Vinai, R, Rafeet, A, Soutsos, M & Sha, W 2016, ' The Role of Water Content and Paste Proportion on Physico-mechanical Properties of Alkali Activated Fly Ash–Ggbs Concrete ', Journal of Sustainable Metallurgy, vol. 2, no. 1, pp. 51-61 . https://doi.org/10.1007/s40831-015-0032-6 |
| ISSN: | 2199-3831 2199-3823 |
| DOI: | 10.1007/s40831-015-0032-6 |
| Popis: | The growth of the construction industry worldwide poses a serious concern on the sustainability of the building material production chain, mainly due to the carbon emissions related to the production of Portland cement. On the other hand, valuable materials from waste streams, particularly from the metallurgical industry, are not used at their full potential. Alkali-activated concrete (AAC) has emerged in the last years as a promising alternative to traditional Portland cement-based concrete for some applications. However, despite showing remarkable strength and durability potential, its utilisation is not widespread, mainly due to the lack of broadly accepted standards for the selection of suitable mix recipes fulfilling design requirements, in particular workability, setting time and strength. In this paper, a contribution towards the design development of AAC synthesised from pulverised fuel ash (60 %) and ground granulated blast furnace slag (ggbs) (40 %) activated with a solution of sodium hydroxide and sodium silicate is proposed. Results from a first batch of mixes indicated that water content influences the setting time and that paste content is a key parameter for controlling strength development and workability. The investigation indicated that, for the given raw materials and activator compositions, a minimum water-to-solid (w/s) ratio of 0.37 was needed for an initial setting time of about 1 h. Further work with paste content in the range of 30–33 % determined the relationship between workability and strength development and w/s ratio and paste content. Strengths in the range of 50–60 MPa were achieved. |
| Databáze: | OpenAIRE |
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