| People | Locations | Statistics |
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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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Galan, Isabel
Graz University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2023New Insights into the Carbonation Process of Mortars and Concretescitations
- 2023Concrete corrosion analysis using optical chemical sensors and imaging
- 2023Optical sensors for the durability assessment of cement-based infrastructure
- 2022The hydration of fast setting spray binder versus (aluminum sulfate) accelerated OPCcitations
- 2022In situ pH monitoring in accelerated cement pastescitations
- 2021Continuous optical in-situ pH monitoring during early hydration of cementitious materialscitations
- 2021Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation and chloride penetrationcitations
- 2021Durability of clinker reduced shotcrete: Ca2+ leaching, sintering, carbonation & chloride penetrationcitations
- 2019Hydration processes of accelerated cementitious systems governing early strength development
- 2017Enthalpy of formation of ye’elimite and ternesite
- 2014Characterization of micro-pore structure in novel cement matricescitations
- 2012Thermogravimetrical analysis for monitoring carbonation of cementitious materialscitations
Places of action
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article
In situ pH monitoring in accelerated cement pastes
Abstract
<p>The fast pH changes in ordinary Portland cement pastes (with and without C<sub>3</sub>A), caused by the addition of an Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> based setting accelerator were in situ monitored by optical pH sensors. The results obtained clearly demonstrated the ability of this novel method to determine the pH with a high temporal resolution. Additionally, the distribution of the accelerator within the cement paste was assessed by fluorescence imaging with the use of a fluorescein tracer. Instantly after the addition of the accelerator and the subsequent formation of ettringite, the pH dropped from ~13 to ~10. The pH drop and recovery rate was controlled by the accelerator dosage and availability of Ca<sup>2+</sup> and OH<sup>−</sup>. The methods presented would help to predict and assess the effects caused by chemical admixtures (e.g. setting accelerators) on the cement hydration progress.</p>