Study on the Effects of the Aging by Accelerated Weathering on the Intumescent Fire Retardant Coating for Steel Elements

Ji Wang

Abstract


This paper reported the results of an experimental study of degradation in fire protection performance of intumescent coating for steel elements after different times of accelerated weathering aging. The physical and chemical changes of the coatings during the aging process were investigated. After aging the surface of the samples were found to become rough, powdered and embrittled; the fire resistance time decreased and the char layer morphology changed significantly. Due to the oxidation, decomposition and hydrolysis reactions in the main components of the coating, such as the resin and the fire retardant system, the content ratio and composition of the coating changed. Then the concerted expansion reaction may not occur between the ingredients when heated, which led to the deterioration of the fire resistance performance of the coating.


DOI
10.12783/dteees/peees2020/35495

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