| 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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Lura, Pietro
Swiss Federal Laboratories for Materials Science and Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (43/43 displayed)
- 2024Mesostructural evolution of fine-aggregate bitumen emulsion–cement composites by X-ray tomographycitations
- 2023A neutron radiography study on the drying of cement mortars: effect of mixture composition and crack lengthcitations
- 2022Experimental assessment and modelling of effective tensile elastic modulus in high performance concrete at early agecitations
- 2021Alkali-silica reaction – a multidisciplinary approachcitations
- 2020Visco-elastic behavior of blended cement pastes at early agescitations
- 2020Microstructure development and autogenous shrinkage of mortars with C-S-H seeding and internal curingcitations
- 2020A laboratory investigation of cutting damage to the steel-concrete interfacecitations
- 2020Chemical prestressing of high-performance concrete reinforced with CFRP tendonscitations
- 2019Intrinsic viscoelasticity of C-S-H assessed from basic creep of cement pastescitations
- 2019Study of physical properties and microstructure of aerogel-cement mortars for improving the fire safety of high-performance concrete linings in tunnelscitations
- 2019On the mechanism of plastic shrinkage cracking in fresh cementitious materialscitations
- 2018A novel method to predict internal relative humidity in cementitious materials by 1 H NMRcitations
- 2018A poromechanics model for plastic shrinkage of fresh cementitious materialscitations
- 2018Susceptibility of Portland cement and blended cement concretes to plastic shrinkage crackingcitations
- 2017Elastic and visco-elastic behavior of cementitious materials at early agescitations
- 2017Evaluation of the ultimate drying shrinkage of cement-based mortars with poroelastic modelscitations
- 2017Corrugated tube protocol for autogenous shrinkage measurements: review and statistical assessmentcitations
- 2016The bleeding test: a simple method for obtaining the permeability and bulk modulus of fresh concretecitations
- 2016Influence of cement on rheology and stability of rosin emulsified anionic bitumen emulsioncitations
- 2016Overview on cold cement bitumen emulsion asphaltcitations
- 2016Using neutron radiography to assess water absorption in air entrained mortarcitations
- 2014Internal curing with lightweight aggregate produced from biomass-derived wastecitations
- 2014Reduction of fire spalling in high-performance concrete by means of superabsorbent polymers and polypropylene fibers small scale fire tests of carbon fiber reinforced plastic-prestressed self-compacting concretecitations
- 2014Effect of self-desiccation and internal curing with superabsorbent polymers on the thermal expansion coefficient of HPC
- 2014Pore structure of mortars with cellulose ether additions – Mercury intrusion porosimetry studycitations
- 2013Controlling the coefficient of thermal expansion of cementitious materials - a new application for superabsorbent polymerscitations
- 2013An investigation on the use of zeolite aggregates for internal curing of concretecitations
- 2013Prediction of self-desiccation in low water-to-cement ratio pastes based on pore structure evolutioncitations
- 2013Influence of cement content and environmental humidity on asphalt emulsion and cement composites performancecitations
- 2012Influence of different conditioning regimes on the oxygen diffusion and oxygen permeability of concrete
- 2012Modeling of water migration during internal curing with superabsorbent polymerscitations
- 2012Ethyl silicate for surface treatment of concrete – part II: characteristics and performancecitations
- 2012Hardening process of binder paste and microstructure developmentcitations
- 2012A numerical and experimental study of aggregate-induced shrinkage cracking in cementitious compositescitations
- 2011Modeling of internal curing in maturing mortarcitations
- 2009A critical examination of statistical nanoindentation on model materials and hardened cement pastes based on virtual experimentscitations
- 2007Standard Test Method for Autogenous Strain of Cement Paste and Mortar
- 2007Influence of Shrinkage-Reducing Admixtures on the Development of Plastic Shrinkage Cracks
- 2006Measurement of volume change in cementitious materials at early ages - Review of testing protocols and interpretation of results
- 2006Modelling of water permeability in cementitious materialscitations
- 2005Micro-crack detection in high-performance cementitious materials
- 2005Internal water curing with Liapor aggregates
- 2003Autogenous shrinkage in high-performance cement paste: An evaluation of basic mechanisms
Places of action
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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.