| 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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Jensen, Ole Mejlhede
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (17/17 displayed)
- 2020Air void analysis of hardened concrete without colour enhancementcitations
- 2020Variation in phase quantification of white portland cement by XRD
- 2016Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016
- 2016Can superabsorbent polymers mitigate shrinkage in cementitious materials blended with supplementary cementitious materials?
- 2016Can superabsorbent polymers mitigate shrinkage in cementitious materials blended with supplementary cementitious materials?
- 2015The influence of superabsorbent polymers on the autogenous shrinkage properties of cement pastes with supplementary cementitious materialscitations
- 2015The influence of superabsorbent polymers on the autogenous shrinkage properties of cement pastes with supplementary cementitious materialscitations
- 2015Superabsorbent Polymers as a Means of Improving Frost Resistance of Concretecitations
- 2013Thermal analysis of cement pastes with superabsorbent polymers
- 2013Use of Superabsorbent Polymers in Concrete
- 2012The Pozzolanic reaction of silica fumecitations
- 2009Synthesis of pure Portland cement phasescitations
- 2007Standard Test Method for Autogenous Strain of Cement Paste and Mortar
- 2005Micro-crack detection in high-performance cementitious materials
- 2004Mitigation strategies for autogenous shrinkage cracking
- 2003Autogenous shrinkage in high-performance cement paste: An evaluation of basic mechanisms
- 2003A thermal comparator sensor for measuring autogenous deformation in hardening Portland cement paste
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document
Micro-crack detection in high-performance cementitious materials
Abstract
Detection and quantification of microcracks due to autogenous shrinkage in high-performance concrete represents a problematic issue. Techniques based on crack impregnation typically require drying of the samples, which may introduce further cracks. Other non-destructive techniques, such as x-ray tomography, do not allow sufficient resolution of microcracks. A new technique presented in this paper allows detection of microcracks in cement paste while avoiding artefacts induced by unwanted restraint, drying or temperature variations. The technique consists in casting small circular cylindrical samples of high-performance cement pastes in silicone moulds that exert minimal external restraint. Cast-in steel rods with varying diameter internally restrain the autogenous shrinkage and lead to crack formation. Dimensions of the steel rods are chosen so that the size of this restraining inclusion resembles aggregate size. Gallium intrusion of the cracks and subsequent examination by electron probe micro analysis, EPMA, are used to identify the cracks. The gallium intrusion technique allows controllable impregnation of cracks in the cement paste. A distinct contrast between gallium and the surrounding material and a µm-resolution are ensured by the EPMA technique. Results of crack detection on cement pastes with different autogenous shrinkage behaviour are presented to show applicability and potentialities of the technique.