| 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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Skibsted, Jørgen
Aarhus University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (41/41 displayed)
- 2024Aqueous carbonation of aged blended Portland cement pastes:Impact of the Al/Si ratio on the structure of the alumina-silica gelcitations
- 2024Reactivity of aqueous carbonated cement pastes:Effect of chemical composition and carbonation conditionscitations
- 2023Future and emerging supplementary cementitious materialscitations
- 2023Composite cements with aqueous and semi-dry carbonated recycled concrete pastescitations
- 2023Enforced carbonation of cementitious materialscitations
- 2022Hydration and mixture design of calcined clay blended cements:review by the RILEM TC 282-CCLcitations
- 2022Fast Room-Temperature Mg 2+ Conductivity in Mg(BH 4 ) 2 ·1.6NH 3 -Al 2 O 3 Nanocompositescitations
- 2022Characterization of supplementary cementitious materials and their quantification in cement blends by solid-state NMRcitations
- 2022Semi-dry carbonation of recycled concrete pastecitations
- 2022Hydration and mixture design of calcined clay blended cements: review by the RILEM TC 282-CCL
- 2022Polymorphism, ionic conductivity and electrochemical properties of lithium closo -deca- and dodeca-borates and their composites, Li 2 B 10 H 10 -Li 2 B 12 H 12citations
- 2021Co 2 mineralization of demolished concrete wastes into a supplementary cementitious material – a new ccu approach for the cement industrycitations
- 2021Effect of alkalis on enforced carbonation of cement paste:Mechanism of reactioncitations
- 2021Creep in reactive colloidal gels:A nanomechanical study of cement hydratescitations
- 2020Probing the validity of the spinel inversion model: a combined SPXRD, PDF, EXAFS and NMR study of $ZnAl_{2}O_{4}$citations
- 2020Impact of Mg substitution on the structure and pozzolanic reactivity of calcium aluminosilicate (CaO-Al 2 O 3 -SiO 2 ) glassescitations
- 2020Effect of carbonated cement paste on composite cement hydration and performancecitations
- 2020Influence of low curing temperatures on the tensile response of low clinker strain hardening UHPFRC under full restraintcitations
- 2020Probing the validity of the spinel inversion model:a combined SPXRD, PDF, EXAFS and NMR study of ZnAl 2 O 4citations
- 2019Optical sensing of ph and o 2 in the evaluation of bioactive self-healing cementcitations
- 2019Sulfate resistance of calcined clay – limestone – Portland cementscitations
- 2019Structure and reactivity of synthetic CaO-Al 2 O 3 -SiO 2 glassescitations
- 2019Optical sensing of ph and o2 in the evaluation of bioactive self-healing cementcitations
- 2019Reactivity of supplementary cementitious materials (SCMs) in cement blendscitations
- 2018Structural Investigation of Ye'elimite, Ca4Al6O12SO4, by 27Al MAS and MQMAS NMR at Different Magnetic Fieldscitations
- 2018The Charge-Balancing Role of Calcium and Alkali Ions in Per-Alkaline Aluminosilicate Glassescitations
- 2018Structural Investigation of Ye'elimite, Ca 4 Al 6 O 12 SO 4 , by 27 Al MAS and MQMAS NMR at Different Magnetic Fieldscitations
- 2017Hydrate Phase Assemblages in Calcium Sulfoaluminate - Metakaolin - Limestone Blendscitations
- 2017Friedel's salt profiles from thermogravimetric analysis and thermodynamic modelling of Portland cement-based mortars exposed to sodium chloride solutioncitations
- 2017Physical performances of alkali-activated portland cement-glass-limestone blendscitations
- 2017Early stage dissolution characteristics of aluminosilicate glasses with blast furnace slag- and fly-ash-like compositionscitations
- 2017The structure-directing amine changes everything:Structures and optical properties of two-dimensional thiostannatescitations
- 2016Experimental studies and thermodynamic modeling of the carbonation of Portland cement, metakaolin and limestone mortarscitations
- 2016Pozzolanic reactivity of pure calcined clayscitations
- 2015TC 238-SCM: hydration and microstructure of concrete with SCMs: State of the art on methods to determine degree of reaction of SCMscitations
- 2015TC 238-SCM: hydration and microstructure of concrete with SCMs:State of the art on methods to determine degree of reaction of SCMscitations
- 2014$mathrm{(NH_{4})_{4}Sn_{2}S_{6}·3H_{2}O}$: Crystal Structure, Thermal Decomposition, and Precursor for Textured Thin Filmcitations
- 2014A novel intermediate in the LiAlH4–LiNH2 hydrogen storage systemcitations
- 2014Hydrogen reversibility of LiBH₄-MgH₂-Al compositescitations
- 2008Microstructure engineering of Portland cement pastes and mortars through addition of ultrafine layer silicatescitations
- 2008Microstructure engineering of Portland cement pastes and mortars through addition of ultrafine layer silicates.
Places of action
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article
Optical sensing of ph and o2 in the evaluation of bioactive self-healing cement
Abstract
<p>Leakage from cementitious structures with a retaining function can have devastating environmental consequences. Leaks can originate from cracks within the hardened cementitious material that is supposed to seal the structure off from the surrounding environment. Bioactive self-healing concretes containing bacteria capable of microbially inducing CaCO<sub>3</sub> precipitation have been suggested to mitigate the healing of such cracks before leaking occurs. An important parameter determining the biocompatibility of concretes and cements is the pH environment. Therefore, a novel ratiometric pH optode imaging system based on an inexpensive single-lens reflex (SLR) camera was used to characterize the pH of porewater within cracks of submerged hydrated oil and gas well cement. This enabled the imaging of pH with a spatial distribution in high resolution (50 μm per pixel) and a gradient of 1.4 pH units per 1 mm. The effect of fly ash substitution and hydration time on the pH of the cement surface was evaluated by this approach. The results show that pH is significantly reduced from pH >11 to below 10 with increasing fly ash content as well as hydration time. The assessment of bioactivity in the cement was evaluated by introducing superabsorbent polymers with encapsulated Bacillus alkalinitrilicus endospores into the cracks. The bacterial activity was measured using oxygen optodes, which showed the highest bacterial activity with increasing amounts of fly ash substitution in the cement, correlating with the decrease in the pH. Overall, our results demonstrate that the pH of well cements can be reliably measured and modified to sustain the microbial activity.</p>