Effect of intumescent paint coating on mechanical properties of FRP bars at elevated temperature. (October 2018)

• Record Type: Journal Article
• Authors: Khaneghahi, Mohammad Houshmand; Najafabadi, Esmaeil Pournamazian; Shoaei, Parham; Oskouei, Asghar Vatani
• Is Part Of: Polymer testing. Volume 71(2018)
• Page Start: 72
• Page End: 86
• Publication Date: 2018-10
• Subjects: Intumescent paint -- Predictive model -- Elevated temperature -- FRP bars -- Tensile strength; Polymers -- Testing -- Periodicals; Polymères -- Tests -- Périodiques; 620.1920287
• DOI: 10.1016/j.polymertesting.2018.08.020
• Languages: English
• ISSNs: 0142-9418

Abstract

Abstract: This paper investigates the influence of intumescent paint on the performance of FRP bars subjected to low (25–450 °C) and severe (450–800 °C) elevated temperatures. In this research, glass and carbon FRP bars with epoxy resin and coated with nitrogen-based intumescent paint were used. In addition to the temperature effects, a variety of FRP bar diameters were employed to determine its effect on the tensile behavior of FRP bars in the presence of intumescent paint. Further, Bayesian regression methods and ANOVA (ANalysis Of VAriance) were applied on the results to develop a predictive model form and quantify the contribution of the variables in the tensile performance of FRP bars, respectively. The results revealed that the intumescent paint prevented the degradation of the mechanical properties of FRP bars significantly, up to 30% of GFRP bars tensile load capacity, at the temperature range 350–600 °C. Highlights: The influence of intumescent paint on FRP bars performance under elevated temperatures were investigated. It is observed that the intumescent paint functions at the temperature between 350 to 600 °C. FRP bars coated with intumescent paint showed higher tensile strength retention than raw FRP bars. According to ANOVA, influence of bar diameter on tensile strength of FRP bars increased considerably in temperature ranging from 350 to 600 °C. The Bayesian predictive model was developed for tensile strength of GFRP and CFRP bars.