References of "Courard, Luc"
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See detailEvaluatie van de gevolgen van de aanwezigheid van kalknodules in beton - Gedetailleerd verslag
Courard, Luc ULg; Darimont, Anne ULg; Degée, Hervé ULg

Report (2010)

De oorspronkelijke verontreiniging (0.7% van het gewicht aan granulaten) is met factor 100 verminderd tijdens de productie van de granulaten en het verwerken van het beton. De maximale verontreiniging ... [more ▼]

De oorspronkelijke verontreiniging (0.7% van het gewicht aan granulaten) is met factor 100 verminderd tijdens de productie van de granulaten en het verwerken van het beton. De maximale verontreiniging geobserveerd op de werf is 0.006% van het gewicht aan granulaten. Op de werf zijn de pop-outs weinig talrijk, de kalknodules zijn klein en de pop-outs ondiep. Geen enkele scheurvorming trof het beton. Het besluit van deze studie, op basis van een worstcasescenario en met een aan zekerheid grenzende waarschijnlijkheid, is dat de verontreiniging geen risico inhoudt wat betreft duurzaamheid en stabiliteit van de werken. We bedoelen daarmee dat het risico op verlies van sterkte en het risico voor stabiliteit en duurzaamheid van structurele elementen (platen, wanden, balken) verbonden aan de aanwezigheid van nodules zo miniem zijn dat ze in feite kleiner zijn dan de risico’s ten gevolge van de normaal aanvaardbare variabiliteit van de eigenschappen van beton, in overeenstemming met de omstandigheden op de werf. Na hydratatie oefenen de verdichte portlandiet-nodules geen druk meer uit en gedragen ze zich als gewone granulaten. De risico’s verbonden aan de betonverontreiniging door kalknodules zijn dus uitsluitend esthetisch van aard en betreffen een maximale diepte van 2 tot 4 cm. [less ▲]

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See detailEvaluation de l'effet de la présence de nodules de chaux dans les bétons - Conclusions
Courard, Luc ULg; Darimont, Anne ULg; Degée, Hervé ULg

Report (2010)

La contamination d’origine (0.7% du poids des granulats) a été amortie d’un facteur 100 durant les étapes de fabrication des granulats et de mise en œuvre des bétons. La pollution maximale observée sur ... [more ▼]

La contamination d’origine (0.7% du poids des granulats) a été amortie d’un facteur 100 durant les étapes de fabrication des granulats et de mise en œuvre des bétons. La pollution maximale observée sur chantier est de 0.006 % du poids des granulats. Sur chantier, les pop-out sont peu nombreux, les nodules de chaux sont de petite taille et les éclats de faible profondeur. Aucune fissuration n’affecte le béton. Cette étude conclut, sur la base du scénario du pire et avec une probabilité avoisinant la certitude, que la contamination ne présente pas de risque en termes de durabilité et de stabilité des ouvrages. Nous entendons par-là, que le risque de perte de résistance et le risque sur la stabilité et la durabilité des éléments de structure (dalles, voiles, poutres) liés à la présence des nodules sont tellement minimes qu’ils sont en réalité nettement plus faibles que ceux qui résultent de la variabilité normale tolérée pour les propriétés des bétons, en rapport avec les conditions de chantier. Après hydratation, les nodules densifiés de portlandite n’exercent plus de pression et se comportent comme de simples granulats. Les risques liés à la contamination des bétons par les nodules de chaux sont donc exclusivement de nature esthétique et concernent une profondeur maximale de 2 à 4 cm. [less ▲]

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See detailEvaluation de l'effet de la présence de nodules de chaux dans les bétons - Rapport détaillé
Courard, Luc ULg; Darimont, Anne ULg; Degée, Hervé ULg

Report (2010)

La contamination d’origine (0.7% du poids des granulats) a été amortie d’un facteur 100 durant les étapes de fabrication des granulats et de mise en œuvre des bétons. La pollution maximale observée sur ... [more ▼]

La contamination d’origine (0.7% du poids des granulats) a été amortie d’un facteur 100 durant les étapes de fabrication des granulats et de mise en œuvre des bétons. La pollution maximale observée sur chantier est de 0.006 % du poids des granulats. Sur chantier, les pop-out sont peu nombreux, les nodules de chaux sont de petite taille et les éclats de faible profondeur. Aucune fissuration n’affecte le béton. Cette étude conclut, sur la base du scénario du pire et avec une probabilité avoisinant la certitude, que la contamination ne présente pas de risque en termes de durabilité et de stabilité des ouvrages. Nous entendons par-là, que le risque de perte de résistance et le risque sur la stabilité et la durabilité des éléments de structure (dalles, voiles, poutres) liés à la présence des nodules sont tellement minimes qu’ils sont en réalité nettement plus faibles que ceux qui résultent de la variabilité normale tolérée pour les propriétés des bétons, en rapport avec les conditions de chantier. Après hydratation, les nodules densifiés de Portlandite n’exercent plus de pression et se comportent comme de simples granulats. Les risques liés à la contamination des bétons par les nodules de chaux sont donc exclusivement de nature esthétique et concernent une profondeur maximale de 2 à 4 cm. [less ▲]

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See detailLa formation: un outil indispensable pour l'ingénieur
Courard, Luc ULg; Michel, Frédéric ULg

Article for general public (2010)

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See detailMatériaux composites
Courard, Luc ULg

Learning material (2010)

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See detailValorisation des déchets et sous-produits industriels en le génie civil
Courard, Luc ULg

Learning material (2010)

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See detailFormulation des bétons
Courard, Luc ULg

Learning material (2010)

Detailed reference viewed: 93 (5 ULg)
See detailEmploi et calcul des coffrages
Courard, Luc ULg

Learning material (2010)

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See detailAmélioration et renforcement des bétons
Courard, Luc ULg

Learning material (2010)

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See detailAmélioration de la qualité texturale des bétons à base de laints hydrauliques
Courard, Luc ULg; Martin, Marie

Report (2010)

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See detailMechanical and durability properties of concrete using contaminated recycled aggregates
Debieb, Farid; Kenaï, Saïd; Courard, Luc ULg et al

in Cement & Concrete Composites (2010), 32(6), 421-426

The degradation of concrete structures due to chlorides and sulphates penetration is of obvious importance in civil engineering as having major impact on structural durability. In this paper, the results ... [more ▼]

The degradation of concrete structures due to chlorides and sulphates penetration is of obvious importance in civil engineering as having major impact on structural durability. In this paper, the results of an investigation on the effect of contaminated crushed concrete aggregates on mechanical properties and durability of recycled concrete are presented. Natural aggregates concrete (NC) slabs were cured in water, sea water, chloride solutions or sulphate solutions and then crushed to obtain virgin and contaminated (polluted) recycled aggregates. The properties of natural (NA) and recycled aggregates (RA) and the mechanical properties and durability performances of a new concrete made from 100% of RA are analysed. The results show that contaminated RA are much sensitive to chlorides than sulphates and are rapidly leached when soaked into water. Significant differences were observed between the properties of original and new concrete and the results clearly show the necessity of taking these contaminations into account. [less ▲]

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See detailThe effect of concrete substrate quality towards evaluation of repair system using impact-echo method
Garbacz, Andrzej; Piotrowski, Tomasz; Kwasniewski, L. et al

in Szczesniak, W. E.; A. Zbiciak, A. (Eds.) Theoretical foundations of civil engineering (2009, September)

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See detailCombination of mechanical and optical profilometry techniques for concrete surface roughness characterization
Perez, Fabien; Bissonnette, Benoît; Courard, Luc ULg

in Magazine of Concrete Research (2009), 61(6)

Achieving durable bond between new and old concrete still represents a challenge in concrete repair technology. It has been the subject of a number of investigations, but in most cases, only adhesion ... [more ▼]

Achieving durable bond between new and old concrete still represents a challenge in concrete repair technology. It has been the subject of a number of investigations, but in most cases, only adhesion strength was addressed. To better understand bond mechanisms, in particular those related to surface roughness, two complementary surface characterisation techniques were implemented, providing a multiscale roughness characterisation by means of specific filtering calculations: mechanical profilometry for low-scale roughness and optical profilometry for the upscale roughness. Using these complementary approaches, different types of concrete surface preparation were characterised. The resulting description highlights the complexity of concrete surface topography. Moreover, it shows that the type of surface preparation essentially affects the meso- and macro-roughness levels, microroughness being practically insensitive. Such results will be useful for better understanding the interlocking potential and bond performance of concrete repairs. [less ▲]

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See detailSome theoretical and practical considerations about surface preparation of concrete and adhesion of repair systems.
Courard, Luc ULg; Garbacz, Andrzej; Piotrowski, Tomasz

in Sustercic, Jakob (Ed.) <<<<< (2009, May)

Before any repair operation, an effective assessment of the concrete substrate has to be performed. Usually next to the surface reparation of concrete, evaluation of the cohesion of the superficial ... [more ▼]

Before any repair operation, an effective assessment of the concrete substrate has to be performed. Usually next to the surface reparation of concrete, evaluation of the cohesion of the superficial concrete is requested for adhesion and durability reasons. Many authors describe the influence of the surface preparation technique on the superficial cohesion of concrete or the adhesion. However, the real effects of surface preparation technique only begin to be investigated in terms of superficial microcracking or roughness quantification. This project was performed in regards to the influence of concrete substrate strength and preparation technique efficiency. The effect of the concrete removal/preparation technique is most likely dependent upon the nature and the quality of the concrete substrate. Preparation techniques are compared from the point of view of concrete removing but also potential deterioration. The visual observation of the concrete surfaces indicates that the high pressure water jetting technique induces a particular texture characterized by large waves mostly parallel to the water flow. The concrete slabs have afterwards been covered with a Self-Compacting Repair Mortar and adhesion has been characterized. [less ▲]

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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 ▲]

Detailed reference viewed: 144 (23 ULg)