Log in

Relevant bibliographies by topics / Durabilité des bétons / Journal articles

To see the other types of publications on this topic, follow the link: Durabilité des bétons.

Journal articles on the topic 'Durabilité des bétons'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 35 journal articles for your research on the topic 'Durabilité des bétons.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Bissonnette, Benoît, Fabien Perez, Simon Blais, and Richard Gagné. "Évaluation des bétons à retrait compensé pour les travaux de réparation." Canadian Journal of Civil Engineering 35, no. 7 (July 2008): 716–26. http://dx.doi.org/10.1139/l07-133.

Full text

Abstract:

Pour être rentables, les réparations superficielles effectuées sur les infrastructures en béton de ciment doivent présenter un niveau de performance adéquat pendant une durée minimale. Parmi les facteurs pouvant affecter la durabilité de ce type d’interventions, le retrait de séchage constitue sûrement l’un des plus importants. L’utilisation de bétons à retrait compensé (BRC) fabriqués avec des liants expansifs constitue une alternative intéressante pour la mise en œuvre de réparations durables. Cet article présente des résultats d’une étude visant à évaluer le potentiel d’utilisation des bétons de réparation fabriqués avec un ciment type K. La démarche expérimentale visait principalement à caractériser la durabilité au gel des BRC, à déterminer si l’adhérence d’un BRC sur un substrat de béton ancien est altérée par l’expansion et, enfin, à évaluer l’efficacité de l’effet de précontrainte mobilisé par adhérence. Bien qu’un certain nombre d’aspects demeurent à étudier, les résultats obtenus se révèlent prometteurs.

APA, Harvard, Vancouver, ISO, and other styles

2

Baroghel-Bouny, Véronique. "Transferts dans les bétons et durabilité." Revue Française de Génie Civil 5, no. 2-3 (April 2001): 145–46. http://dx.doi.org/10.1080/12795119.2001.9692297.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

BERTRON, Alexandra. "Durabilité des bétons en ambiance agricole." Revue Française de Génie Civil 7, no. 1 (January 2003): 106. http://dx.doi.org/10.1080/12795119.2003.9692454.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Oualit, Mehena, Yannick Melinge, Raoul Jauberthie, and M. Tahar Abadlia. "Durabilité des bétons des réseaux d’assainissement urbain." Matériaux & Techniques 107, no. 2 (2019): 202. http://dx.doi.org/10.1051/mattech/2019017.

Full text

Abstract:

Technologiquement, le réseau d’assainissement à base cimentaire est de constitutions diverses et la mise en œuvre de matériaux de plus en plus performants contribue à une meilleure durabilité. Or, si aujourd’hui, il est aisé d’identifier des états de référence, quant aux propriétés des matériaux et des ouvrages tant sur le plan physique, chimique, mécanique…, la mise en évidence de ces états de références s’avère délicate pour les structures et formulations anciennes. L’objectif de cet article est d’étudier la durabilité des réseaux d’assainissement de la ville de Rennes (France) constitués de conduites à base cimentaire. Des données relatives aux caractéristiques des conduites ont été collectées (type du réseau, diamètre, épaisseur, date de mise en place…) pour chaque tronçon étudié. En plus de la qualité apparente des prélèvements, des essais de caractérisation ont été réalisés sur des éprouvettes cylindriques carottées tels que la masse volumique, la porosité et la résistance ultime en compression. Les résultats des analyses sont recensés et discutés et des corrélations sont établies pour expliquer l’évolution des propriétés des matériaux et évaluer la cinétique d’altération. Cette investigation est réalisée dans l’optique de pouvoir envisager les opérations de maintenance dans une logique de prévention et non consécutive à un accident.

APA, Harvard, Vancouver, ISO, and other styles

5

Pigeon, Michel, Richard Gagné, Pierre-Claude Aitcin, and Marcel Langlois. "La durabilité au gel des bétons à haute performance." Canadian Journal of Civil Engineering 19, no. 6 (December 1, 1992): 975–80. http://dx.doi.org/10.1139/l92-116.

Full text

Abstract:

Frost resistance of high-strength concrete (80–100 MPa) was studied by subjecting 44 concrete mixes to freeze–thaw cycles in water (ASTM C666, standard procedure A) and to scaling tests in the presence of deicer salts (ASTM C672, standard). The test programme was designed to analyze the effects of the water/cement ratio, the type of cement, the type of coarse aggregate, the duration of curing, and the air-void spacing factor. Results demonstrate that the water/cement ratio limiting value, below which entrained air is no longer necessary to protect concrete against freeze–thaw cycles, is sometimes higher than 0.30 but is more often below 0.25. This limiting value is affected most by cement characteristics: type 30 cement yielded much more durable concretes. Laboratory scaling tests demonstrated that when water/cement ratios are less than 0.30, the resistance deicer salt is generally very good, no matter what are the type of cement, the silica fume content, or the air-void spacing factor of the concrete. Key words: durability, freeze–thaw cycle, silica fume, scaling, curing, spacing factor, water/cement ratio, compressive strength, cement type, entrained air, aggregate. [Journal translation]

APA, Harvard, Vancouver, ISO, and other styles

6

Gagné, Richard, Michel Pigeon, and Pierre-Claude Aïtcin. "Durabilité au gel des bétons de hautes performances mécaniques." Materials and Structures 23, no. 2 (March 1990): 103–9. http://dx.doi.org/10.1007/bf02472569.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Wirquin, E., R. Hadjieva-Zaharieva, and F. Buyle-Bodin. "Utilisation de l'absorption d'eau des bétons comme critères de leur durabilité—Application aux bétons de granulats recyclés." Materials and Structures 33, no. 6 (July 2000): 403–8. http://dx.doi.org/10.1007/bf02479650.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Bournazel, Jean-Pierre, François Boutin, and Noureddine Rafaï. "Les analogues anciens et l'analyse inverse pour la durabilité des bétons." Revue Française de Génie Civil 2, no. 3 (January 1998): 341–52. http://dx.doi.org/10.1080/12795119.1998.9692171.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Deby, Fabrice, Myriam Carcasses, and Alain sellier. "Approche performantielle probabilisée pour la durabilité des bétons d'ouvrages en environnement marin." Revue européenne de génie civil 13, no. 1 (January 31, 2009): 9–19. http://dx.doi.org/10.3166/ejece.13.9-19.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Deby, Fabrice, Myriam Carcasses, and Alain Sellier. "Approche performantielle probabilisée pour la durabilité des bétons d'ouvrages en environnement marin." European Journal of Environmental and Civil Engineering 13, no. 1 (January 2009): 9–19. http://dx.doi.org/10.1080/19648189.2009.9693082.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Kenai, S., and F. Debieb. "Caractérisation de la durabilité des bétons recyclés à base de gros et fins granulats de briques et de béton concassés." Materials and Structures 44, no. 4 (November 1, 2010): 815–24. http://dx.doi.org/10.1617/s11527-010-9668-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Roux, S., N. Bur, B. Tribollet, and F. Feugeas. "Comment améliorer la durabilité de bétons plus éco-respectueux grâce à des polymères bactériens." Matériaux & Techniques 99, no. 5 (2011): 573–80. http://dx.doi.org/10.1051/mattech/2011111.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

DJERBI, Assia. "Diffusion des ions chlorure dans des bétons fissurés. Application à la durabilité des ouvrages littoraux." Revue Européenne de Génie Civil 10, no. 8 (September 2006): 1000. http://dx.doi.org/10.1080/17747120.2006.9692881.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Bederina, M., T. Bouziani, M. Khenfer, and M. Quéneudec. "Absorption de l’eau et son effet sur la durabilité des bétons de sable allégés par ajout de copeaux de bois." MATEC Web of Conferences 2 (2012): 01006. http://dx.doi.org/10.1051/matecconf/20120201006.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Chiheb, D., M. Belaoura, M. N. Oudjit, and A. Bali. "Incorporation des sables concassés à différents taux de fillers dans la composition des bétons à très hautes performances : Comportement mécanique et Durabilité." Lebanese Science Journal 17, no. 2 (December 27, 2016): 146–65. http://dx.doi.org/10.22453/lsj-017.2.146165.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Lacroix, Roger, Paul Acker, Pierre Xercavins, Jean-Louis Costaz, Jacques Long Trinh, Thierry Kretz, Georges Grenier, Charles Baloche, Vu Bui, and Robert Chaussin. "Fissuration et durabilité du béton." Revue Française de Génie Civil 2, no. 2 (January 1998): 171–254. http://dx.doi.org/10.1080/12795119.1998.9692162.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Pigeon, Michel. "La durabilité au gel du béton." Materials and Structures 22, no. 1 (January 1989): 3–14. http://dx.doi.org/10.1007/bf02472689.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Lamontagne, A., M. Pigeon, and D. Beaupré. "Durabilité des réparations en béton projeté." Materials and Structures 28, no. 5 (June 1995): 260–66. http://dx.doi.org/10.1007/bf02473260.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Jolin, Marc, and Pierre Lacombe. "Le béton projeté : nouveaux développements et applications." Canadian Journal of Civil Engineering 27, no. 2 (April 1, 2000): 383–88. http://dx.doi.org/10.1139/l99-088.

Full text

Abstract:

This paper presents the most recent developments in shotcrete technology obtained in the last 5 years through the "Industrial Chair on Shotcrete and Concrete Repair" hosted at Laval University. The main goal of this paper is to inform those involved in the construction and repair of civil engineering concrete structures of the various possibilities of "shotcrete." The two first sections present the basic principles in pneumatic application of concrete along with the two processes in shotcrete technology, the dry-mix and wet-mix. The advantages of both processes as well as the general rules to follow in a shotcrete application are also presented and explained. The third and last section, the most important, highlights the latest developments in shotcrete technology. These developments concern the use of set accelerating admixtures in dry process shotcrete and their effects on the durability of materials, the use of liquid and powdered air-entraining admixtures in dry-mix shotcrete as well as the concept of "high initial air content" in wet mix shotcrete.Key words: shotcrete, set accelerator, air-entraining admixture, durability, setting time.

APA, Harvard, Vancouver, ISO, and other styles

20

Bérard, Jean, and Richard Roux. "La viabilité des bétons du Québec: le rôle des granulats." Canadian Journal of Civil Engineering 13, no. 1 (February 1, 1986): 12–24. http://dx.doi.org/10.1139/l86-003.

Full text

Abstract:

The petrographic study of numerous concrete structures in Quebec has revealed the extent of postconstruction chemical reactions. Those reactions between the aggregates, which form 70% of the volume of the concrete, and the cement paste result in early deterioration and undesirable mechanical deformation of the structures. From this study, it appears that the coarse aggregates can react in three different ways: (a) by peripheral reaction, which is the case for massive granitic rocks, (b) by bulk swelling, as illustrated by the Potsdam orthoquartzite, and (c) by formation of silica gel veinules within the aggregate, as shown by some Trenton limestone. Considering these three mechanisms, it is easy to understand why certain aggregates react rapidly, that is within a few months, whereas others show signs of distress only after scores of years. Using the three rock types cited above, we have also tried to evaluate existing concrete standards and their capability to detect the most important pathologies encountered in concrete. Key words: concrete, aggregate, alkalis, disintegration, expansion, testing, durability.

APA, Harvard, Vancouver, ISO, and other styles

21

Pigeon, Michel, and Marcel Langlois. "Etude de la résistance au gel de bétons contenant un fluidifiant." Canadian Journal of Civil Engineering 18, no. 4 (August 1, 1991): 581–89. http://dx.doi.org/10.1139/l91-071.

Full text

Abstract:

There is some controversy about freezing resistance of concrete containing superplasticizers. It has been quite convincingly demonstrated that, in some cases, such admixtures can significantly alter air-void systems in concrete. Some researchers believe, however, that concrete with superplasticizers can resist frost even when the air-void spacing factor is higher than the usual limit of 200 μm. The freeze–thaw cycle resistance tests described in this paper show that with the two types of concrete tested (a plain concrete with a water/cement ratio of 0.50 and a concrete with the same water/cement ratio but containing silica fume), the critical air-void spacing factor value is not significantly affected by the presence of a superplasticizer. When regular concrete is to be exposed to freeze–thaw conditions, the air-void system should meet the usual standards even when a superplasticizer is present. Key words: concrete, freezing and thawing, durability, superplasticizer, spacing factor, silica fume, water–cement ratio. [Journal translation]

APA, Harvard, Vancouver, ISO, and other styles

22

Boisvert, Jean, Jacques Marchand, Michel Pigeon, and Henri L. Isabelle. "Durabilité au gel-dégel et résistance à l'écaillage des pavés de béton." Canadian Journal of Civil Engineering 19, no. 6 (December 1, 1992): 1017–24. http://dx.doi.org/10.1139/l92-121.

Full text

Abstract:

Tests results described in this paper show that it is quite easy to produce concrete paving blocks with excellent resistance to freezing–thawing cycles in water. Good resistance to frost-associated scaling in the presence of deicing salts is, however, much more difficult to obtain; and the problem is particularly difficult to analyse because two types of tests gave very different results. A freezing test in the presence of a saline solution (ASTM C672) showed positive influence of certain parameters (such as finer material), but freezing tests in a brine bath (ACNOR CAN3 A231.2 M85) did not show influence of any variable. In addition, the high number of compacting voids made it very difficult to interpret measurements of air-void characteristics made by examining ground sections under an optical microscope (ASTM C457). Key words: concrete paving blocks, scaling resistance, deicing salts, freezing–thawing cycles, air-void spacing factor. [Journal translation]

APA, Harvard, Vancouver, ISO, and other styles

23

Mirza, Saeed. "Durability design of infrastructure and some related issues." Canadian Journal of Civil Engineering 33, no. 6 (June 1, 2006): 650–72. http://dx.doi.org/10.1139/l06-078.

Full text

Abstract:

The life cycle performance of any infrastructure should be taken into consideration in its design, its construction, its maintenance, its operation, and when needed, its rehabilitation. The protection of infrastructure must be holistic, taking into account long-term socioeconomic and environmental considerations and the impact of the global climate change. Fulfilling the requirements of the ultimate and serviceability limit states over the service life of the facility requires an understanding of the use of the system, the deterioration response of the materials and their components when subjected to aggressive environments, and how this deterioration can be prevented or significantly delayed by preventive, remedial, and routine maintenance. The composition, microstructure, macrostructure, and various modes of deterioration of materials used in construction (steel, wood, concrete) are reviewed, along with possible remedial measures. The development of concrete as a construction material, its durability, and the relevant durability provisions in the various Canadian Standards Association standards are reviewed briefly. Current European practice and the 1990 Comité Euro-International du béton Design Guide for Durable Concrete Structures are evaluated. The engineer's responsibility for durable performance of a facility and the importance of durability audits are also examined.Key words: aggressive environment, construction materials, deterioration, durability, durability audits, life cycle performance, macrostructure, microstructure, socioeconomic and environmental considerations, sustainability.

APA, Harvard, Vancouver, ISO, and other styles

24

Sonebi, M., and K. H. Khayat. "Bétons à haute performance pour fabriquer des panneaux destinés à réparer des structures submergées." Canadian Journal of Civil Engineering 20, no. 4 (August 1, 1993): 650–59. http://dx.doi.org/10.1139/l93-082.

Full text

Abstract:

The field of repair of submerged hydraulic structures (dams, stilling basins, lock chambers, and so forth) is becoming more and more important given the economic worth of such structures. Damage caused by abrasion can make it difficult to maintain such structures in service. The purpose of the study described in this paper was to develop durable high-performance concretes that can be used for manufacture of board for repair of abrasion-damaged surfaces. The board might also be placed on surfaces already repaired with colloidal concrete poured underwater. Two types of cement (Type 30 and Type 10) and two high-performance coarse aggregates (granite and dolomitic limestone) were used. The eight concrete mixes developed included a variety of additives and admixtures such as silica fume, steel fibre, latex, and superplasticizer. For precise characterization of the mixes, hydraulic abrasion tests, compressive strength tests, and freeze–thaw cycle resistance tests were performed. In addition, shrinkage, thermal expansion coefficient, and permeability of the concretes were measured; in some cases, the board might be subject to freeze–thaw cycles in structures partially emptied for repair or maintenance. Results show that high-performance concretes with very low water: cement ratio, good workability, and improved freeze–thaw cycle resistance can be manufactured. Concretes made with Type-30 cement, silica fume, and granite or limestone aggregate offer excellent hydraulic abrasion resistance (depth of erosion on the order of 1 mm after 72 h), compressive strength greater than 115 MPa after 91 days, and a freeze–thaw durability factor of more than 100%. Key words: abrasion, concrete, durability, steel fibre, silica fume, freeze–thaw cycle, latex, board, underwater repair.

APA, Harvard, Vancouver, ISO, and other styles

25

Chauveau, E., C. Trombert, B. Demelin, and P. Guiraud. "La solution des armatures inox pour la durabilité du béton armé : une revue des propriétés." Matériaux & Techniques 99, no. 1 (2011): 51–64. http://dx.doi.org/10.1051/mattech/2011004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Hayek, Mahmoud, Marie Salgues, Frédéric Habouzit, Sandrine Bayle, Jean-Claude Souche, Klartjee De Weerdt, and Sylvain Pioch. "L’influence de la carbonatation sur la biocolonisation de matériaux cimentaires dans le milieu marin." Matériaux & Techniques 108, no. 2 (2020): 202. http://dx.doi.org/10.1051/mattech/2020020.

Full text

Abstract:

Les ingénieurs spécialisés en génie civil doivent intégrer dans leur design des mesures de protection de la biodiversité marine de qui autorise le concept d’écoconception d’infrastructures marines respectueuses de l’environnement. Les matériaux cimentaires sont privilégiés pour concevoir les infrastructures marines et interagissent avec le milieu marin. Ces structures seront colonisées par des micro-organismes et macroorganismes marins. Dans un premier temps, les organismes forment un biofilm à la surface du béton en fonction des facteurs environnementaux et des propriétés physico-chimiques du matériau. Dans cette étude, il a été démontré que la pré-carbonatation des matériaux cimentaires accélère la croissance des micro-organismes formant le biofilm à leur surface en abaissant le pH de la surface. Il a été démontré en laboratoire que la colonisation de la surface par des micro-organismes augmente également l’hydrophobicité de la surface et pourrait ainsi améliorer la durabilité du matériau en diminuant l’absorption d’eau de mer contenant des agents agressifs.

APA, Harvard, Vancouver, ISO, and other styles

27

Helson, Olivier, Javad Eslami, Anne-Lise Beaucour, Albert Noumowe, and Philippe Gotteland. "Étude parametrique de matériaux modèles : aide au dimensionnement des ouvrages souterrains issus de mélanges sol-ciment." Revue Française de Géotechnique, no. 162 (2020): 2. http://dx.doi.org/10.1051/geotech/2020004.

Full text

Abstract:

Le Deep Soil Mixing est une technique d’amélioration de sols dont la part de marché devient non négligeable. Les progrès technologiques dans le domaine permettent aujourd’hui d’envisager la réalisation d’ouvrages permanents. L’utilisation structurelle du matériau sol-ciment n’est cependant pas encore réglementée comme le béton avec l’Eurocode 2, ni validée par un nombre suffisant d’études de durabilité. Ces problématiques ont donc fait l’objet d’un travail de recherche au sein du laboratoire de mécanique et matériaux du génie civil (L2MGC) avec le soutien de la Fédération Nationale des Travaux Publics (FNTP) et de l’entreprise « Spie Fondations ». Cet article présente de manière synthétique le résultat des travaux expérimentaux qui ont été conduits afin de mieux comprendre l’influence des paramètres de formulation et des conditions d’exposition sur le comportement du matériau. L’étude met tout d’abord en évidence le lien entre la conductivité hydraulique du matériau et le diamètre caractéristique des pores. Des relations mathématiques sont ensuite proposées afin d’estimer les propriétés mécaniques du matériau. Puis, les propriétés résiduelles du matériau sont analysées en situation de vieillissement accéléré et à haute température.

APA, Harvard, Vancouver, ISO, and other styles

28

Chaid, Rabah, Raoul Jauberthie, Jahid Zeghiche, and Fetoum Kherchi. "Impact de la poudre de marbre conjuguée au calcaire du CEM II sur la durabilité du béton." European Journal of Environmental and Civil engineering 15, no. 3 (March 28, 2011): 427–45. http://dx.doi.org/10.3166/ejece.15.427-445.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

El-Abidine Kameche, Zine, Fouad Ghomari, Marta Choinska, and Abdelhafid Khelidj. "La perméabilité relative aux gaz : Une propriété de transport importante contrôlant la durabilité du béton partiellement saturé." MATEC Web of Conferences 11 (2014): 01020. http://dx.doi.org/10.1051/matecconf/20141101020.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Chaid, Rabah, Raoul Jauberthie, Jahid Zeghiche, and Fetoum Kherchi. "Impact de la poudre de marbre conjuguée au calcaire du CEM II sur la durabilité du béton." European Journal of Environmental and Civil Engineering 15, no. 3 (January 2011): 427–45. http://dx.doi.org/10.1080/19648189.2011.9693335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Saric-Coric, Mladenka, and Pierre-Claude Aïtcin. "Bétons à haute performance à base de ciments composés contenant du laitier et de la fumée de silice." Canadian Journal of Civil Engineering 30, no. 2 (April 1, 2003): 414–28. http://dx.doi.org/10.1139/l03-005.

Full text

Abstract:

For each tonne of cement used, the cement industry emits an average of 0.9 t of CO2, which contributes to the greenhouse effect. To satisfy the demands of the concrete industry for cementing materials, new environmental requirements, and the implementation of a sustainable development policy, the use of supplementary cementitious material as a replacement of part of the Portland cement has proven to be an interesting avenue that has not yet been fully explored. Granulated blast-furnace slag has been and is being used as a supplementary cementitious material in replacement of cement in many countries. In Canada, its proportion is usually limited to 20-25% of cement replacement owing to a significant decrease in early age compressive strength as well as a lower scaling resistance. In this study, we have tried to show that by reducing the water:cement ratio we can increase cement replacement by slag up to 50% without harming its short-term compressive strength and scaling resistance. The concretes that were prepared had a workability comparable to that of the reference concrete without slag, sufficient compressive strength to allow demoulding after 24 h, very low chloride ion permeability even at 28 d, as well as very good freeze-thaw and scaling resistance, as long as it is water-cured for a slightly longer period.Key words: high-performance concrete, blast-furnace slag, sustainable development, superplasticizers, workability, durability, silica fume.

APA, Harvard, Vancouver, ISO, and other styles

32

Larose, Gaston, and Michel Pigeon. "Béton produit en bétonnière mobile et en usine conventionnelle : comparaison des caractéristiques du réseau de bulles d'air." Canadian Journal of Civil Engineering 15, no. 3 (June 1, 1988): 306–14. http://dx.doi.org/10.1139/l88-046.

Full text

Abstract:

The durability of concrete to freeze-thaw cycles is dependent upon the existence of an adequate air-void system. There are very few studies on the air-void system of field concretes. Laboratory tests have proven that the air content measurement on the fresh concrete is not sufficient to judge the aptitude of the air-void system to protect the concrete from frost damage.This paper is a comparison of the air-void systems of field concretes produced in either a conventional plant or a mobile unit the use of which is becoming more and more frequent. The concretes produced in the conventional plant generally had sufficient air-void systems for air contents in the usual range (5–7%). The mobile unit showed that a slightly higher air content (8%) was needed to produce an adequate air-void system. Key words: concrete, mobile concrete-mixer, air-void systems, air-entraining agent, spacing factor, surface area, air content.

APA, Harvard, Vancouver, ISO, and other styles

33

Matthews, Stuart, and Giuseppe Mancini. "Forensic engineering - fib MC 2020 and existing structures." MATEC Web of Conferences 199 (2018): 01001. http://dx.doi.org/10.1051/matecconf/201819901001.

Full text

Abstract:

The fib (Fédération Internationale du Béton) is developing a new fib Model Code for Concrete Structures, under a working title of Model Code 2020 (MC2020). Numerous aspirational goals have been identified for MC2020. It will be a single code dealing with both new and existing concrete structures, which is both the design of new structures and all the activities relating to the assessment, interventions and the through-life management and care of existing concrete structures, including matters relating to durability and service life design. MC2020 will incorporate many improvements and extensions to the guidance available in the current fib Model Code for Concrete Structures fib Model Code 2010 (MC2010). The new and extended models, in association with the other aspects of the updated guidance, will provide improved technical capabilities for undertaking forensic engineering studies of existing concrete structures. These concepts are illustrated by a number of case studies of existing concrete structures subject to damage / deterioration / other inadequacies, as well as associated intervention works. Improved technical guidance provisions will allow forensic engineers to gain a better understanding of the behaviour of existing concrete structures, enabling better judgements to be made of how they behave in-service & what measures / interventions are most appropriate to extend their useful life.

APA, Harvard, Vancouver, ISO, and other styles

34

Perraton, Daniel, Alan Carter, Michel Vaillancourt, and Bruno Lavoie. "Perméabilité in situ du béton de peau, établie à partir de la percolation d'un gaz en régime d'écoulement permanent." Canadian Journal of Civil Engineering 29, no. 3 (June 1, 2002): 360–68. http://dx.doi.org/10.1139/l02-009.

Full text

Abstract:

In an attempt to apply the concepts developed by Carman and Klinkenberg for the measurement of permeability of a porous media using a gas, a permeameter for the in-situ measurement of intrinsic permeability of skin concrete has been developed. The established technique allows concentration of gas percolation through a well-defined zone in the superficial layer of concrete. The instrument, the measurement method, and the calculation procedure are described in details in this paper. Several series of tests have been performed in laboratory on concrete blocks (300 × 300 × 400 mm) to simulate measurements on the construction site. Three types of concrete, with different porosity, have been tested. The measurement of permeability performed on the concrete blocks have been accomplished both on shaped surfaces, which are representative of skin concrete, and on sawed surfaces, which are representative of mass concrete. Results show that the relationship between the water/cement ratio and the permeability of skin concrete varies distinctively compared with that of mass concrete. The permeameter allows quantification of what has been for a long time qualified as a determining element in terms of the durability of concrete against the corrosion of reinforcement, that is, the distinct permeability of skin concrete from that of mass concrete.Key words: skin concrete, in-situ permeability, intrinsic permeability, apparent permeability, permeameter, Klinkenberg.[Journal translation]

APA, Harvard, Vancouver, ISO, and other styles

35

Gagné, Richard, Yvon Latreille, and Jacques Marchand. "Les effets des caractéristiques du réseau de bulles d'air, du type de mûrissement, du truellage de surface et de la fumée de silice sur la résistance à l'écaillage d'un béton à haute performance." Canadian Journal of Civil Engineering 23, no. 6 (December 1, 1996): 1260–71. http://dx.doi.org/10.1139/l96-935.

Full text

Abstract:

In Canada, high-performance concretes (HPCs) are increasingly used in construction and repair, particularly for its durability, which is distinctly superior compared with ordinary concrete. The current tendency is to provide for a spacing factor of air bubbles lower than 230 μm in all HPCs that are subjected to freeze–thaw cycles. This choice is basically the outcome of an ongoing controversy as to the necessity of providing a good network of entrained air bubbles to protect HPCs against freeze–thaw cycles. In the future, the optimal use of HPC will depend, among other factors, on a better understanding of minimal requirements regarding the characteristics of air voids to ensure a good behavior of HPCs under freeze–thaw cycles. The results of the investigation reported herein show that a spacing factor lower than approximately 500 μm can be sufficient to ensure a good resistance of HPCs to scaling. It is also shown that surface trawling, slump, and set-retarding agents have only secondary effects on the scaling resistance of HPCs. Silica fume and membrane curing have allowed to improve significantly the scaling resistance of the HPCs under investigation. Key words: high-performance concrete, durability, scaling, set-retarding agent, silica fume, surface finishing, curing, pumping, entrained air, spacing factor.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!