| 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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Govin, Alexandre
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (30/30 displayed)
- 2022Effect of different retarders and their combination with superplasticizer on the properties of CSA
- 2021Effect of Citric Acid and Polycarboxylate Superplasticizers (PCE) on Hydration and Rheology of Sulfoaluminate Cement
- 2019Hydration and rheology of sulfoaluminate cements (CSA) in presence of polycarboxylate superplasticizers (PCE) and citric acid
- 2019Combination of superplasticizers with hydroxypropyl guar, effect on cement-paste propertiescitations
- 2018Hydration and rheology of sulfoaluminate-belite cements (SAC) in presence of polycarboxylate superplasticizers (PCE) and citric acid
- 2018Impact of a thin coating layer of calcium aluminate and sulfoaluminate cements on algal biofouling
- 2017Experimental study of self-heating phenomenon at the reactor-scale. Safety assessment of a fixed-bed filled with torrefied wood chips
- 2017Effect of guar gum derivatives combined with superplasticizers on properties of portland cement-pastes
- 2017Combination of guar gum derivatives and superplasticizers, impact on properties of Portland cement-pastes
- 2016Experimental study of self-heating phenomena during torrefaction of spherical wood particles
- 2016Development of treatment to prevent the algal biofouling
- 2016Modification of water retention and rheological properties of fresh state cement-based mortars by guar gum derivativescitations
- 2015Impact of Guar Gum Derivatives on Properties of Freshly-Mixed Cement-Based Mortars
- 2015Effect of the Chemical Composition of Building Materials on Algal Biofouling
- 2015Modification of fresh state properties of Portland cement-based mortars by guar gum derivatives
- 2015Effect of Guar Gum Derivatives on Fresh State Properties of Portland Cement-Based Mortars
- 2014Influence of the chemical composition of mortars on algal biofouling
- 2014Lifetime durability of bio-based composites
- 2014Development of an accelerated test of fungal biodeterioration. Application to calcium aluminate cements
- 2014Synthesis and Fluidization of Wood Powders Application to biofuel production
- 2014Influence of hydroxypropylguars on rheological behavior of cement-based mortarscitations
- 2013NMR investigations of water retention mechanism by cellulose ethers in cement-based materials
- 2012Nuclear magnetic relaxation dispersion investigations of water retention mechanism by cellulose ethers in mortarscitations
- 2010Energy requirement for fine grinding of torrefied woodcitations
- 2009Effect of cellulose ethers on water retention in freshly-mixed mortars
- 2009Effect of torrefaction on grinding energy requirement for thin wood particle production
- 2009Influence of cellulose ether particle size on water retention of freshly-mixed mortars
- 2008Water transport in freshly-mixed mortars containing cellulose ethers
- 2007Study of efflorescence forming process on cementitious materials // Etude du processus de formation des efflorescences sur des matériaux cimentaires
- 2007Structural transformations of bioactive glass 45S5next term with thermal treatmentscitations
Places of action
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conferencepaper
Effect of guar gum derivatives combined with superplasticizers on properties of portland cement-pastes
Abstract
ICBBM: International Conference on Bio-based Building Materials (3BM) /ECOGRAFI : ECOlogical valorisation of GRAnular and FIbrous materials / Proceedings PRO 119 / e-ISBN: 978-2-35158-192-6 ; International audience ; Chemical admixtures allow to create a variety of fresh and hardened state properties in cementitious materials. In the case of self-compacting concrete, plasticizers or superplasticizers are introduced with the aim to decrease the yield stress and the viscosity of the materials. However, in order to prevent segregation and bleeding, and to improve the water retention of cement-based system, stabilizing agents or viscosity agents are often introduced in addition. Among these admixtures, polysaccharides are most commonly used. The aim of this study is to provide an understanding of competitive or synergetic effects induced by the combination of hydroxypropyl guar stabilizing agents (HPG) and superplasticizers on cement pastes. Two polycarboxylate superplasticizers (PCE) exhibiting different charge densities and one HPG were studied. It was found that the combination of HPG with PCE superplasticizer strongly affects the rheological behavior of cement pastes. Despite the presence of HPG, the viscosity of the pastes strongly decreased with increasing dosage of PCE until it became close to the viscosity of a cement paste with PCE only. However, the use of HPG in combination with PCE allows maintaining a significant yield stress in the cement paste compared to PCE alone. The increase in the charge density of the PCE seemed to amplify the drop of the viscosity and to reduce the gain on the yield stress induced by HPG. The results also highlight a delay in the setting-time of the cement paste by adding HPG and PCE. The delay induced by HPG is significantly lower than that generated by PCEs. However, the combination of the both kind of admixtures leads to a slightly shorter setting-time compared to the PCE alone.