| 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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Gluth, Gregor
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (44/44 displayed)
- 2024Chloride binding by layered double hydroxides (LDH/AFm phases) and alkali-activated slag pastes: an experimental study by RILEM TC 283-CAM
- 2024Carbonation resistance of alkali-activated GGBFS/calcined clay concrete under natural and accelerated conditionscitations
- 2024Influence of salt aggregate on the degradation of hybrid alkaline cement (HAC) concretes in magnesium chloride-rich saline solution simulating evaporite rock
- 2024Sulfides in the pore solutions of GGBFS-containing concretes - Influence on the corrosion of reinforcing steel
- 2024Report of RILEM TC 281-CCC: insights into factors affecting the carbonation rate of concrete with SCMs revealed from data mining and machine learning approachescitations
- 2024Report of RILEM TC 281-CCC: insights into factors affecting the carbonation rate of concrete with SCMs revealed from data mining and machine learning approachescitations
- 2023Application of electrochemical methods for studying steel corrosion in alkali-activated materialscitations
- 2023Application of electrochemical methods for studying steel corrosion in alkali‐activated materialscitations
- 2023Carbonation of concrete with SCMs: a data analysis by RILEM TC 281-CCC
- 2023Concrete corrosion characterization using advanced microscopic and spectroscopic techniques
- 2022Kinetics of Sulfide Oxidation in alkaline solutions studied by X-ray absorption near-edge structure spectroscopy
- 2022The influence of curing temperature on the strength and phase assemblage of hybrid cements based on GGBFS/FA blendscitations
- 2022Acid resistance of alkali-activated materials: recent advances and research needscitations
- 2021Calcined brick clays and mixed clays as supplementary cementitious materials: Effects on the performance of blended cement mortarscitations
- 2021Provenancing of cement using elemental analyses and isotope techniques – The state-of-the-art and future perspectivescitations
- 2021Unraveling the hardening mechanism during laser-induced slip casting of lithium aluminate-microsilica slurrycitations
- 2021Cu- and Zn-doped alkali activated mortar – Properties and durability in (bio)chemically aggressive wastewater environmentscitations
- 2021Effect of Curing Temperature on the Alkali Activation of German Brown Coal Fly Ashcitations
- 2021Calorimetry Study of the Influence of Portland Cement Content, Slag/Fly Ash Ratio, and Activator Type on the Early Hydration of Hybrid Cementscitations
- 2020Chloride‐induced steel corrosion in alkali‐activated fly ash mortar: Increased propensity for corrosion initiation at defectscitations
- 2020RILEM TC 247-DTA round robin test: carbonation and chloride penetration testing of alkali-activated concretescitations
- 2019Comparison of calcined illitic clays (brick clays) and low-grade kaolinitic clays as supplementary cementitious materialscitations
- 2019One-part geopolymers and aluminosilicate gel-zeolite composites: factors influencing microstructure and engineering propertiescitations
- 2019Investigation of calcined brick clays from Central Germany for use as a sustainable pozzolan
- 2019Thermal properties and steel corrosion in light-weight alkali-activated mortars
- 2019Acoustic emission study of heat-induced cracking in fly ash-based alkali-activated pastes and lightweight mortarscitations
- 2019Behaviour of reinforced alkali-activated fly ash mortars under leaching conditions
- 2018The influence of activator composition on the strength, shrinkage and chloride migration resistance of alkali-activated slag mortarscitations
- 2018The fate of iron during the alkali-activation of synthetic (CaO-)FeOx-SiO2 slags: An Fe K-edge XANES studycitations
- 2018Leaching, carbonation and chloride ingress in reinforced alkali-activated fly ash mortarscitations
- 2017Investigations on one-part geopolymers synthesized from different silica sources
- 2017Corrosion of steel reinforcement in geopolymer mortars - carbonation resistance, chloride migration, and preliminary corrosion potential data
- 2017Topical issue: Geopolymers
- 2017Intumescent geopolymer-bound coatings for fire protection of steel
- 2017Steel corrosion in reinforced alkali‐activated materialscitations
- 2017Differentiation of the solid-state NMR signals of gel, zeolite phases and water species in geopolymer-zeolite compositescitations
- 2016The effect of heat treatment on the mechanical and structuralproperties of one-part geopolymer-zeolite compositescitations
- 2016In-situ thermo-mechanical testing of fly ash geopolymer concretes made with quartz and expanded clay aggregatescitations
- 2015Structural investigations on one-part geopolymers with different chemical composition
- 2015Design and characterization of fly ash-based geopolymer concretes for a round-robin durability testing program
- 2014Gas separation using porous cement membranecitations
- 2014Rheological properties of microsilica and sodium aluminate based one-part geopolymers compared to ordinary Portland cement
- 2014Hydration and strength development of calcite-rich wastepaper sludge ash
- 2013Pore structure and permeability of hardened calcium aluminate cement pastes of low w/c ratiocitations
Places of action
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article
The influence of curing temperature on the strength and phase assemblage of hybrid cements based on GGBFS/FA blends
Abstract
Hybrid cements are composites made of Portland cement or Portland clinker and one or more supplementary cementitious materials like slag, fly ash or metakaolin, activated with an alkali salt. To date, their hydration mechanism and the phase formation at various temperatures is insufficiently understood, partly due to the large variability of the raw materials used. In the present study, three hybrid cements based on ground granulated blast furnace slag, fly ash, Portland clinker and sodium sulfate, and an alkali-activated slag/fly ash blend were cured at 10 and 21.5°C, and subsequently analyzed by XRD, 27Al MAS NMR, and TGA. The compressive strength of the hybrid cements was higher by up to 27% after 91-day curing at 10°C, compared to curing at 21.5°C. The experimental results as well as thermodynamic modeling indicate that the differences in compressive strength were related to a different phase assemblage, mainly differing amounts of strätlingite and C-N-A-S-H, and the associated differences of the volume of hydration products. While the strätlingite was amorphous to X-rays, it could be identified by 27Al MAS NMR spectroscopy, TGA and thermodynamic modeling. The microstructural properties of the hybrid cements and the alkali-activated slag/fly ash blend as well as the compatibility between thermodynamic modeling results and experimental data as a function of curing temperature and time are discussed.