References of "Courard, Luc"
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See detailSurfology: concrete substrate evaluation prior to repair
Courard, Luc ULg; Michel, Frédéric ULg; Schwall, Damien ULg et al

in Mammoli, A.; Brebbia, C. A. (Eds.) Materials Characterization: computational methods and experiments IV (2009)

The study of adhesion of repair materials on concrete structures implies a good knowledge of the influence of concrete surface treatment. The effects of surface preparation technique are rarely clearly ... [more ▼]

The study of adhesion of repair materials on concrete structures implies a good knowledge of the influence of concrete surface treatment. The effects of surface preparation technique are rarely clearly described and parameterised: it is consequently difficult to point out the real influence of roughness on adhesion results. A large research project has been realized with regards to the influence of concrete substrate strength and preparation technique efficiency. The surface roughness of concrete has been quantified by means of the projection “Moiré” technique, which is an interferometrical measurement method. Comparison between polished, scrabbled and hydro-jetted surfaces evaluation is presented. [less ▲]

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See detailZnaczenie inżynierii powierzchni w naprawach betonu
Garbacz, Andrzej; Piotrowski, Tomasz; Courard, Luc ULg

in Kaminski, M.; Jasiczak, J.; Buczkowski, W. (Eds.) et al Współczesne metody naprawcze w obiektach budowlanych (2009)

Recently, an efficiency of concrete repair is treated as the civilizing challenge. This was also the genesis to elaborate family of European standards EN 1504. The part 10 of this standard gives ... [more ▼]

Recently, an efficiency of concrete repair is treated as the civilizing challenge. This was also the genesis to elaborate family of European standards EN 1504. The part 10 of this standard gives requirements for substrate condition before and during application including structural stability, storage, the preparation and application of products and systems for the protection and repair of concrete structures including quality control, maintenance, health and safety, and the environment. According to this standard a suitable preparation of concrete substrate prior a repair is considered as the one of the important factors affecting durability of concrete repair. Recently, experiences in this filed is ordered in the framework of scientific approach called concrete surface engineering. The main goal of this approach is analysis of qualitative and quantitative relationships between surface quality and repair durability. The aim of this paper is to analyze an effect of surface treatment on surface quality and adhesion in repair system using concrete surface engineering approach. [less ▲]

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See detailLe béton apparent: influence de l'état du moule sur l'aspect des surfaces
Martin, Marie; Migeotte, Nathalie; Goffinet, Cécile et al

in Benboudjema, Farid (Ed.) Compte-rendu des Journées Scientifiques du (RF)2B (2009)

L’aspect d’un parement en béton (teinte et bullage) dépend entre autres de la surface de coffrage utilisée. L’influence du nombre de réutilisations des coffrages sur la teinte et le bullage de surface a ... [more ▼]

L’aspect d’un parement en béton (teinte et bullage) dépend entre autres de la surface de coffrage utilisée. L’influence du nombre de réutilisations des coffrages sur la teinte et le bullage de surface a été étudiée. Deux séries de moules en bois contreplaqué et OBS ont été usés afin de simuler de 1 à 118 réutilisations pour le contreplaqué et de 2 à 51 réutilisations pour le bois OSB. Les moules ont ensuite été utilisés pour couler des cubes de béton. La première série a été coulée en utilisant une huile végétale et la deuxième une huile minérale. La teinte et le bullage en surface des bétons coulés ont été mesurés et étudiés au travers d’une étude statistique afin de déterminer l’influence de la réutilisation des coffrages sur l’aspect des parements. [less ▲]

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See detailUse of concrete road recycled aggregates for Roller Compacted Concrete
Courard, Luc ULg; Michel, Frédéric ULg; Delhez, Pascal

in Construction & Building Materials (2009), 24((3)), 390-395

Construction waste management is a quite important economical and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia ... [more ▼]

Construction waste management is a quite important economical and environmental deal for our societies. More than 2 million tons demolition and construction wastes are annually produced only in Wallonia, Southern Region of Belgium; recycling has clearly to be promoted. Roller Compacted Concrete (RCC) is a special dry concrete made of aggregates, water and low quantity of cement, laid down and compacted like a soil, for the construction of massive structures like dams or large horizontal surfaces like road foundations. The topic of this research is the replacement of natural aggregates by concrete road recycled aggregates in the mix design of concrete. Characteristics of aggregates are of prime importance for the quality of the concrete: Los Angeles, water absorption and specific gravity. It has been observed that RCC with natural and concrete road recycled aggregates are similar for solid compactness, while no major influence of cement content – when around 200 kg - may be detected. However, compressive strength is higher for RCC with natural aggregates. This study clearly shows the opportunity of using concrete road recycled aggregates for RCC in basements. [less ▲]

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See detailRoller Compacted Concrete with contaminated recycled aggregates
Courard, Luc ULg; Debieb, Farid; Kenai, Saïd et al

in Construction & Building Materials (2009), 23

Recycling waste building materials from construction and demolition (C&D) sites is increasingly investigated for economical and environmental reasons. Roller compacted concrete (RCC) is a special dry ... [more ▼]

Recycling waste building materials from construction and demolition (C&D) sites is increasingly investigated for economical and environmental reasons. Roller compacted concrete (RCC) is a special dry concrete mix; laid down and compacted like a soil, it is especially used for the construction of massive structures like dams or large horizontal surfaces like road foundation. In this paper, natural concrete slabs were cured in water, sea water, chloride solutions or sulphate solutions and then crushed to obtain virgin and contaminated (polluted) recycled aggregates. The aim of this research is the total replacement (100% coarse and fine) of natural aggregates (NA) by recycled concrete aggregates (RA) in the composition of a roller compacted concrete. The natural and recycled aggregates are characterised and compared. The mechanical properties and durability performances of concrete with contaminated RA are analysed. The experimental results showed that the polluted RA are much richer in chlorides than in sulphates and are leached if they are soaked in water. Significant differences were observed between the properties of original and new concrete and the results demonstrated the need of taking these contaminations into account. [less ▲]

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See detailRecherches menées à l'Université de Liège dans le domaine du béton en 2008-2009
Dotreppe, Jean-Claude ULg; Franssen, Jean-Marc ULg; Somja, Hugues et al

Conference given outside the academic context (2009)

Composite steel-concrete columns made of CFSHS filled with self compacting concrete under ambaint temperature and in the fire situation. Design equation for the buckling of high strength concrete columns ... [more ▼]

Composite steel-concrete columns made of CFSHS filled with self compacting concrete under ambaint temperature and in the fire situation. Design equation for the buckling of high strength concrete columns subkected to compression and bending. Improvement of the textural quality of concrete with hydraulic binders. Influence of the reutilisation of OSB panels shuttering on the colour and texture of concrete surfaces. Non destructive methods for the detection of delamination in the decks of concrete bridges [less ▲]

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See detailEvaluation of saturation and microcracking of the superficial zone of concrete: new developments
Courard, Luc ULg; Lenaers, Jean-François

in Alexander, M. G.; Beushausen, H.-D.; Dehn, F. (Eds.) et al Concrete Repair, Rehabilitation and Retrofitting II (2009)

Proper surface preparation is essential for the durability of the repaired structure as well as specific saturation level of the concrete. Moreover, the repair material is often blamed for “not sticking” ... [more ▼]

Proper surface preparation is essential for the durability of the repaired structure as well as specific saturation level of the concrete. Moreover, the repair material is often blamed for “not sticking”, but the general source of the trouble lies with the substrate surface conditioning. The extensive research project has been undertaken to develop specifications and performance criteria for surface preparation of concrete substrates, one of the tasks of which was to develop a field test to evaluate the optimum moisture conditioning of the substrate concrete prior to application of repair material. The Autocalm system has been calibrated and compared with destructive and non destructive tests (Schmidt hammer, microscope observations and water absorption) on three types of concrete and two types of surface preparation. In order to evaluate different saturation levels, concrete samples have been stored in more than 12 modes of conservation. [less ▲]

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See detailMaintenance, entretien et réparation des constructions en béton
Courard, Luc ULg

Learning material (2009)

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See detailCorrelation between the roughness of the substrate surface and the debonding risk
Perez, Fabien; Morency, Maxim; Bissonnette, Benoît et al

in Alexander, M. G.; Beushausen, H.-D.; Dehn, F. (Eds.) et al Concrete Repair, Rehabilitation and Retrofitting II (2009)

This paper presents the influence of substrate surface preparation on the adhesion strength of repaired beams system. Bond between new and old concrete has been the subject of a number of investigations ... [more ▼]

This paper presents the influence of substrate surface preparation on the adhesion strength of repaired beams system. Bond between new and old concrete has been the subject of a number of investigations, but in most cases, only adhesion strength was addressed. This parameter was used to estimate the durability and/or the debonding risk for repaired structure and it’s a generally accepted auditing standards. Usually, surface preparation of the substrate concrete is considered essential to achieve a durable repair because of its influence on the bond strength. To better understand debonding mechanism, in particular these related to surface preparation, roughness parameters were calculated to quantify the influence of surface preparation on the structural behaviour. Using this approach, repair beams prepared by way of four (4) concrete surface preparations were characterized. Results obtained show that repaired beams presenting a substrate with a rough surface permit to achieve a monolithic behaviour of the repaired system. Opposite structural behaviour, with large debonding, was recorded for those having smooth surface. However, all surface preparations used have promoted the same bond strength regardless the roughness of the substrate. The resulting analysis highlights the relation between roughness parameter αrough and the debonding mechanism of repaired beams. Such results will be useful to better predict the performance of concrete repairs. [less ▲]

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See detailEvaluation of the effect of load eccentricity on pull-off strength
Moczulski, Grzegorj; Garbacz, Andrzej; Courard, Luc ULg

in Alexander, M. G.; Beushausen, H.-D.; Dehn, F. (Eds.) et al Concrete Repair, Rehabilitation and Retrofitting II (2009)

The efficiency of the composite repair system is usually evaluated through semi-destructive test: pull-off test. But some difficulties can also be induced by the eccentricity of the load application, due ... [more ▼]

The efficiency of the composite repair system is usually evaluated through semi-destructive test: pull-off test. But some difficulties can also be induced by the eccentricity of the load application, due to incorrect placement of the test device. The paper presents the results of a research project and the impact of incorrect design on tensile strength values. According to results of laboratory experiments and modelling, it can be observed that, if there is an influence of 2o and 4o angle of inclination on pull-off bond strength, it is however not statistically significant: the decrease of pull-off strength is usually no larger than 8% for 2o [less ▲]

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See detailAesthetic evaluation and control of concrete building surfaces
Martin, Marie ULg; Gilson, Arnaud; Courard, Luc ULg

in Eterradossi, O. (Ed.) Materials and Sensations 2008 Proceedings (2008, October)

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See detailApplication du concept de performance équivalente aux bétons additionnés de fillers calcaires
Michel, Frédéric ULg; Piérard, Julie; Courard, Luc ULg

in Annales du Bâtiment et des Travaux Publics (2008), 3

The European standard EN 206-1 integrates the concept of the k-coefficient that allows to take into account the addition of pozzolanic and hydraulic fine materials in order to respect the requirements ... [more ▼]

The European standard EN 206-1 integrates the concept of the k-coefficient that allows to take into account the addition of pozzolanic and hydraulic fine materials in order to respect the requirements concerning the formulation of concrete for the chosen environment. Some national application documents extend this concept to other types of mineral additives such as limestone fillers. In Belgium this principle is not applied yet. Within the scope of the current study, limestone fillers coming from different activity sectors in the Walloon Region (production of aggregates, lime or ornamental stones) were selected. Their influence on the consistency of concrete, its mechanical properties and its long-term behaviour (water-porosity, air permeability and carbonation resistance) was evaluated. [less ▲]

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See detailOcena skutecznosci napraw – wplyw jakosci podkladu betonowego
Czarnecki, Lech; Courard, Luc ULg; Garbacz, Andzej

in Inzynieria i Budownictwo (Engineering and Building Industry) (2007), 12

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See detailCompatibility performance as a fundamental requirement for the repair of concrete structures with Self-Compacting Repair Mortars
Courard, Luc ULg; Bissonnette, Benoît

in De Schutter, Geert; Boel, V. (Eds.) Self Compacting Concrete SCC2007 (2007, September)

Durable adhesion of repair material on concrete substrate requires compatibility between the materials to be bonded. There are four main compatibility components to be addressed in any concrete repair ... [more ▼]

Durable adhesion of repair material on concrete substrate requires compatibility between the materials to be bonded. There are four main compatibility components to be addressed in any concrete repair scenario: dimensional, permeability, chemical and electrochemical compatibility. Among those, dimensional compatibility is often prevalent: while a cement-base repair material inevitably undergoes shrinkage, the substrate opposes to its free movement, a situation that can lead to cracking and, subsequently, promote debonding. Besides, an essential requirement for bond development is the creation of the interface itself: the intimate contact between the repair system and concrete substrate is required in order to maximize adhesion. Adequate compaction of the new layer is consequently one of the main parameters that will govern the quality of the bond: sufficient vibration or specific rheological properties for the repair material are needed. Self-Compacting Repair Mortar (SCRM) can be advantageously used in many repair situations. Limestone fillers seem to offer interesting advantages as addition to these repair materials as they increase the workability of the final product. Several materials have been tested and characterised by means of a physical, chemical and mechanical characterization test program: specific attention has been given to water demand and superplasticizer efficiency. [less ▲]

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See detailInfluence of physico-chemical characteristics of limestone fillers on fresch and hardened mortar performances
Michel, Frédéric ULg; Piérard, Julie; Courard, Luc ULg et al

in De Schutter, G.; Boel, V. (Eds.) Self-Compacting Concrete SCC 2007 (2007, September)

In order to meet the specific requirements for fresh Self-Compacting Concrete (SCC), i.e. a high workability together with a good resistance to segregation, the amount of coarse aggregates has to be ... [more ▼]

In order to meet the specific requirements for fresh Self-Compacting Concrete (SCC), i.e. a high workability together with a good resistance to segregation, the amount of coarse aggregates has to be reduced and replaced by fine material. Since cement is quite expensive and can develop a high heat of hydration with possible problems for thermal cracks in massive concrete, mineral fillers are usually used. In Belgium, local available materials are limestone fillers; they are very well-adapted for the optimisation of particle packing and flow behaviour of cementitious paste in SCC mixes. These by-products are issued from different sectors, such as the aggregate and lime production industry (quarrying operations) and the ornamental stones industry (sawing operations). The suitability of these fillers for use in SCC or conventional concrete production was investigated. This paper reports the effect of the nature and the substitution rate of the fillers on the properties of mortars. Some relationship between the physico-chemical properties of the fillers and the properties of mortars were brought forward. [less ▲]

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See detailInżynieria powierzchni betonu. Część 3. Termodynamiczne uwarunkowania adhezji
Courard, Luc ULg; Garbacz, Andrzej; Piotrowski, Tomasz

in Materialy Budowlane (2007), 2

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See detailWhat about concrete in the next thirty years ?
Courard, Luc ULg

Conference (2007)

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See detailConcrete surface roughness characterization by means of opto-morphology technique
Courard, Luc ULg; Schwall, D.; Piotrowski, T.

in Adhesion in Interfaces of Building Materials: a Multi-Scale Approach (2007)

Detailed reference viewed: 38 (9 ULg)
See detailOn the effect of concrete surface roughness on stress wave propagation in repair systems
Piotrowski, T.; Garbacz, A.; Schwall, D. et al

in Adhesion in Interfaces of Building Materials: a Multi-Scale Approach (2007)

Detailed reference viewed: 23 (6 ULg)