Durability of road and bridge concrete and spray-coating waterproof material in REVUE DES COMPOSITES ET DES MATERIAUX AVANCES, Vol. 31, N° 4 (08/2021)  

[article]  inREVUE DES COMPOSITES ET DES MATERIAUX AVANCES > Vol. 31, N° 4 (08/2021) . - p. 227-235 Titre : Durability of road and bridge concrete and spray-coating waterproof material Type de document : texte imprimé Année de publication : 2021 Article en page(s) : p. 227-235 Note générale : Bibliogr. Langues : Français (fre) Catégories : Copolymère éthylène acétate de vinyle Dépôt par pulvérisation Durée de vie (Ingénierie) Imperméabilisation Matériaux cimentaires Mélanges (chimie) Ponts -- Revêtements protecteurs Routes -- Revêtements protecteurs Index. décimale : 667.9 Revêtements et enduits Résumé : Different from traditional waterproof methods for road and bridge concrete, the spray-coating waterproof material can effectively prevent rainwater and other corrosive liquids from entering the concrete structure, and it has a few functional advantages such as anti-carbonization, resistance to sulfate attack, and high elongation. Existing studies have discussed the impact of the microstructure of waterproof material on the structure of waterproof coating, the optimization of the mix ratios of waterproof material, and the influencing factors of the waterproof performance of waterproof material, etc., however, few researches have concerned about the mechanical properties of concrete after coated with the spray-coating waterproof material. Therefore, to fill in this research gap, this paper researched the durability of road and bridge concrete and the spray-coating waterproof material. At first, it analyzed the bridge deck water pressure and the internal force of the drain pipe structure under multiple drainage methods, and calculated the water pressure at the gutter inlet, the stress, and the permeability coefficient of the waterproof coating. Then, this paper elaborated on the experimental methods for measuring the durability of the road and bridge before and after coated with the spray-coating waterproof material, and introduced the methods for testing the waterproof material and the concrete. At last, this paper gave the corresponding experimental results, the analysis, and the conclusion. Note de contenu : - Simulation of road and bridge drainage before and after coated with the spray-coating waterproof material - Experiment on the durability of roads and bridges before and after using the spray-coating waterproof material : Experimental methods of waterproof material - Experimental methods of concrete - Experimental results and analysis : - Table 1 : Physical and mechanical parameters of different parts of bridge - Table 2. Orthogonal test results of water absorption rate of the waterproof material - Table 3. Durability of the waterproof material under different compressive stress conditions - Table 4. Correspondence between thickness and time - Table 5. Calculation results of waterproof safety factor of the concrete structure DOI : https://doi.org/10.18280/rcma.310406 En ligne : https://www.iieta.org/download/file/fid/60464 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37674 [article]

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Failure of a bridge deck topcoat / Warren Brand in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 33, N° 11 (11/2016)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 33, N° 11 (11/2016) . - p. 22-25 Titre : Failure of a bridge deck topcoat Type de document : texte imprimé Auteurs : Warren Brand, Auteur Année de publication : 2016 Article en page(s) : p. 22-25 Langues : Américain (ame) Catégories : Epoxydes Expertises Matériaux cimentaires -- Revêtements protecteurs Ponts -- Revêtements protecteurs Revêtements -- Analyse Revêtements -- Finition Revêtements protecteurs -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : It’s never a good day when large chunks of a newly installed three-layer epoxy coating system begin to come off of any concrete floor — and even more troubling when they come off of a bridge deck. Concrete is absorbent. It will hold chlorides, moisture, oils, greases, chemicals, gases and anything else that comes into contact with it. Cracks on a roadway, and more specifically on a concrete bridge, can provide a pathway to the rebar for contaminants, and particularly for chlorides from road salt. Rebar is wrapped in a figurative alkaline blanket approaching a pH of 11 when sitting in concrete. The alkalinity creates a thin patina on the rebar which, if maintained at that pH, will prevent corrosion for decades. However, if chlorides do enter the concrete and lower the pH, the corrosion rate of the rebar can skyrocket and therefore, preventing this phenomenon is critical. Cracks and concrete go hand-in-hand. Concrete tends to crack for a variety of reasons and while almost always inevitable, instances of cracking can be reduced with proper design and engineering and if cracks do occur, they can be properly managed with appropriate coatings and other remedial solutions. Note de contenu : - THE BACKGROUND : The flood coat - The overlay - FAILURE ANALYSIS : Visual inspection - Laboratory analysis - FIGURES : 1. An overall view of a lapped section of Core Sample No. 4 - 2. A close-up of a lapped section of Core Sample No. 4 showing the epoxy overlay/concrete substrate interface - 3. A close-up view of the separation between the epoxy overlay and the concrete substrate - 4. Close-up view of separation (filled with blue epoxy) between the epoxy overlay and the concrete substrate under cross-polarized light En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=5951 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28382 [article]

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The need for an independent third-party coatings inspector / Tim Bauman in JOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL), Vol. 35, N° 2 (02/2018)  

[article]  inJOURNAL OF PROTECTIVE COATINGS & LININGS (JPCL) > Vol. 35, N° 2 (02/2018) . - p. 38-46 Titre : The need for an independent third-party coatings inspector Type de document : texte imprimé Auteurs : Tim Bauman, Auteur Année de publication : 2018 Article en page(s) : p. 38-46 Langues : Américain (ame) Catégories : Acier L'acier est un alliage métallique utilisé dans les domaines de la construction métallique et de la construction mécanique. L'acier est constitué d'au moins deux éléments, le fer, très majoritaire, et le carbone, dans des proportions comprises entre 0,02 % et 2 % en masse1. C'est essentiellement la teneur en carbone qui confère à l'alliage les propriétés du métal qu'on appelle "acier". Il existe d’autres métaux à base de fer qui ne sont pas des aciers comme les fontes et les ferronickels par exemple. Adhésion -- Défauts Analyse des défaillances (fiabilité) Copolymère vinyle ester Eaux usées -- Stations de traitements Epoxydes Expertises Matériaux cimentaires -- Revêtements protecteurs Métaux -- Revêtements protecteurs Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Ponts -- Revêtements protecteurs Revêtements -- Défauts:Peinture -- Défauts Revêtements -- Détérioration:Peinture -- Détérioration Revêtements organiques Traitement de surface par impact Index. décimale : 667.9 Revêtements et enduits Résumé : During my career in the coatings world, I grew from a green sales rep into an SSPC- and NACE-certified inspector, who later became a trainer in the protective coatings industry. I believe that no matter what your training or what college or graduate school you went to, the world of heavy-duty protective coatings is so expansive that sooner or later you will need to enlist a coatings specialist, expert or consultant to understand why things are done the way they are and to take steps to make certain that the specification is enforced. For example, a good engineer knows that for coatings or linings to do what they intend to do, abrasive blasting is almost always required. A good engineer may know that concrete needs to be blasted but may not know some of the finer points (i.e., the ICRI Standards that call out specific concrete surface preparation results based on the total film thickness of the system that is specified) that are critical to a successful linings project. Over my 30-year tenure in this field, I have seen many coating failures. I remember in my certification courses listening to the grizzled vets tell their “old war stories.” Now I have my own, three of which I am going to share with you. The point of this article is that an independent third-party coatings inspector, while not always required, is a very good idea and certainly worth the money involved. The three stories I’m going to tell you are true, but the names are changed to protect the innocent as well as the guilty. En ligne : http://www.paintsquare.com/archive/?fuseaction=view&articleid=6257 Format de la ressource électronique : Web Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30375 [article]

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