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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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Adu-Amankwah, Samuel
Aston University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2023Impact of hydration stoppage on quantification of the GGBS content in ternary limestone cements using the PONKCS methodcitations
- 2023Circular economy, data analytics, and low carbon concreting: a case for managing recycled powder from end-of-life concretecitations
- 2023Early age reaction of slag in composite cement: Impact of sulphates and calcitecitations
- 2022Application of the Rietveld-PONKCS technique for quantitative analysis of cements and pitfalls of hydration stopping methodscitations
- 2022Low-carbon concreting: a harmonised approach between material selection and design
- 2022From composition to the microstructure and durability of limestone ternary blended cements:citations
- 2021Combined influence of carbonation and leaching on freeze-thaw resistance of limestone ternary cement concretecitations
- 2017Influence of limestone on the hydration of ternary slag cementscitations
- 2016Effect of synthesis parameters on the performance of alkali-activated non-conformant EN 450 pulverised fuel ashcitations
Places of action
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article
Early age reaction of slag in composite cement: Impact of sulphates and calcite
Abstract
Ground granulated blast furnace slag (GGBS) is an important supplementary cementitious material (SCM) for producing low carbon and durable concrete. There are however questions around the early age reactivity of GGBS and the factors that influence this. To elucidate the fundamental mechanisms controlling the early age reactivity and particularly the influence of anionic species, simplified systems comprising GGBS and calcium hydroxide were examined in the presence of limestone, anhydrite, or both at 4:1 SCM-to-activator ratio. Limestone and GGBS were considered as SCMs, but calcium hydroxide and anhydrite were considered as activators. Multiple techniques, including isothermal calorimetry, thermogravimetry, X-ray diffraction, electron microscopy, mass balance calculation and mercury intrusion porosimetry were used to study hydration and microstructure. The results show that GGBS hydration commences immediately in the alkaline media provided by calcium hydroxide. Sulphates and limestone influence hydration through reactions with aluminates to form ettringite and carboaluminates, but prevalence of macro-capillary pores in sulphate containing binders sustains diffusion-controlled hydration. Consequently, optimization of the alumina to sulphate and carbonate ratios is essential for exploiting the pore solution and space filling effects in composite cements.