Method to determine the equivalent thermal diffusion coefficient of the intumescent coating for cables / Zhong-jun Shu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 5 (09/2014)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 5 (09/2014) . - p. 817-826 Titre : Method to determine the equivalent thermal diffusion coefficient of the intumescent coating for cables Type de document : texte imprimé Auteurs : Zhong-jun Shu, Auteur ; Ji Wang, Auteur ; Liang Zhou, Auteur Année de publication : 2014 Article en page(s) : p. 817-826 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse des défaillances (fiabilité) Cables Diffusivité thermique Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Index. décimale : 667.9 Revêtements et enduits Résumé : The thermal diffusion coefficient of the intumescent insulating layer, which forms when a fire-retardant coating is subjected to heat in a fire, is a key factor used in assessing the fire protection performance of the coating. However, because there are many factors influencing this coefficient, it is usually difficult to measure its value directly from tests. Based on the insulation failure experiment of a cable exposed to heat, the relationship between failure time, equivalent thermal diffusion coefficient, and thickness of expansion layer has been determined by means of numerical calculation from a heat transfer model built in this paper; a computing formula has been thus established. According to the formula, the equivalent thermal diffusion coefficient of the expansion layer can be determined after the diffusion coefficient and the thickness of the expansion layer are obtained from the insulation failure experiment of a cable. Note de contenu : - THE MODELING OF CABLE HEAT TRANSFER : 1. The experimental basis of the modeling - 2. Modeling - NUMERICAL CALCULATION AND DETERMINATION OF THE RELATIONAL EXPRESSION : 1. Numerical calculations methods and procedures - 2. Analysis of cases - 3. The determination of the relational expression between the cable insulation failure time, the expanded thickness of the coating, and the thermal diffusion coefficient - THE DETERMINATION OF THE THERMAL DIFFUSION COEFFICIENT DOI : 10.1007/s11998-014-9587-6 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9587-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22064 [article]

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The protective effects and aging process of the topcoat of intumescent fire-retardant coatings applied to steel structures / Ji Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 1 (01/2016)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 1 (01/2016) . - p. 143-157 Titre : The protective effects and aging process of the topcoat of intumescent fire-retardant coatings applied to steel structures Type de document : texte imprimé Auteurs : Ji Wang, Auteur Année de publication : 2016 Article en page(s) : p. 143-157 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais accélérés (technologie) Ignifugeants Composé chimique utilisé pour réduire l'inflammabilité. Il peut être incorporé au produit durant sa fabrication ou appliqué ultérieurement à sa surface. Intumescence (chimie) Polyuréthanes Revêtements -- Effets du rayonnement ultraviolet Revêtements -- Finition:Peinture -- Finition Revêtements protecteurs -- Détérioration Index. décimale : 667.9 Revêtements et enduits Résumé : The protective effects of a topcoat on an intumescent fire-retardant coating were studied under hydrochloric acid solution corrosion, accelerated UV aging and natural weathering. The protective effects were determined to be appreciable under all the aging conditions. During hydrochloric acid corrosion testing, the coating sample without the topcoat exhibited no fire resistance after immersion for 48 h. When a topcoat was used, the acid solution could not directly corrode the fire-retardant coating. However, the solution was observed to seep into the coating layer from the edges, demonstrating that special attention must be paid to the edges and corners to avoid the pollution source corroding the coating and substrate. Under the accelerated UV aging conditions, the fire-resistant properties of the unprotected coating deteriorated significantly after 20 days of aging due to the hydrolysis and photooxidation of the components. However, the coating with a topcoat exhibited better fire-proof properties, even after 40 days of aging. During the natural weathering process, the fire resistance of the coating without a topcoat significantly decreased after being exposed to the high levels of precipitation and UV radiation that occur during summer. The fire-resistant properties were completely lost after 1 year of aging exposure. However, the protected sample exhibited no distinct changes in the duration of fire resistance. The results of this study remind engineering personnel to pay attention to the deterioration of the coating properties and to take protection measures. Despite slightly decreasing the fire resistance performance and increasing the cost, the protective effect of the topcoat was remarkable. Therefore, a compatible topcoat is considered indispensable for fire-retardant coatings used outdoors to ensure the best long-term fire resistance performance. Note de contenu : - EXPERIMENTAL : Specimen preparation - Aging scenarios - Testing equipment and conditions - EXPERIMENT RESULTS : The protective effect of the topcoat for the acid corrosion - The protective effect of the topcoat for accelerated UV aging - The protective effect of the topcoat for natural weathering DOI : 10.1007/s11998-015-9733-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9733-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25384 [article]

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