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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Barnett, Stephanie Jayne
University of Portsmouth
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2024Life cycle assessment of steel fibre-reinforced concrete beamscitations
- 2019Behaviour of hybrid steel fibre reinforced self compacting concrete using innovative hooked-end steel fibres under tensile stresscitations
- 2017Effects of steel fibre-aggregate interaction on mechanical behaviour of steel fibre reinforced concretecitations
- 2016Investigating geometrical size effect on the flexural strength of the ultra high performance fibre reinforced concrete using the cohesive crack modelcitations
- 2016Distribution and orientation of steel fibres in steel fibre reinforced concrete
- 2016Factors influencing the compressive strength of fly ash based geopolymerscitations
- 2014Modelling behaviour of ultra high performance fibre reinforced concretecitations
- 2014Numerical simulation of ultra high performance fibre reinforced concrete panels subjected to blast loadingcitations
- 2013Maturity testing of lightweight self-compacting and vibrated concretescitations
- 2011Study of fibre orientation and distribution in UHPFRC by electrical resistivity and mechanical tests
- 2010Assessment of fibre orientation in ultra high performance fibre reinforced concrete and its effect on flexural strengthcitations
- 2008The effect of temperature on the rate of strength development of slag cement
- 2007Fast-track construction with slag cement concrete: adiabatic strength development and strength prediction
- 2007UHPFRC - Optimisation of mix proportions
- 2006Strength development of mortars containing ground granulated blast-furnace slag: effect of curing temperature and determination of apparent activation energiescitations
- 2003Extent of immiscibility in the ettringite-thaumasite systemcitations
- 2002Study of thaumasite and ettringite phases formed in sulfate/blast furnace slag slurries using XRD full pattern fittingcitations
- 2001An XRPD profile fitting investigation of the solid solution between ettringite, Ca6Al2(SO4)3(OH)12.26H2O, and carbonate ettringite, Ca6Al2(CO3)3(OH)12.26H2Ocitations
- 2000Solid solutions between ettringite, Ca6Al2(SO4)3(OH)12.26H2O, and thaumasite, Ca3SiSO4CO3(OH)6.12H2Ocitations
Places of action
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article
Factors influencing the compressive strength of fly ash based geopolymers
Abstract
Several factors affecting the reactivity of fly ash (FA) as a precursor for geopolymer concrete have been investigated. These include physical and chemical properties of various FA sources, inclusion of ground granulated blast furnace slag (ggbs), chemical activator dosages and curing temperature. Alkali-activated FA was found to require elevated curing temperatures and high alkali concentrations. A mixture of sodium hydroxide and sodium silicate was used and this was shown to result in high strengths, as high as 70 MPa at 28 days. The presence of silicates in solution was found to be an important parameter affecting strength. Detailed physical and chemical characterisation was carried out on thirteen FA sources from the UK. The most important factor affecting the reactivity was found to be the particle size of FA. The loss on ignition (LOI) and the amorphous content are also important parameters that need to be considered for the selection of FA for use in geopolymer concrete. The partial replacement of FA with ggbs was found to be beneficial in not only avoiding the need for elevated curing temperatures but also in improving compressive strengths. Microstructural characterisation with scanning electron microscope (SEM) coupled with energy dispersive X-ray spectroscopy (EDS) was performed on FA/ggbs pastes. The reaction product of FA and ggbs in these binary systems was calcium aluminium silicate hydrate gel (C-A-S-H) with inclusion of Na in the structure.