Experimental Study On The Influence Of Section Shape On The Fire Performance Of The Ultra-thin Fire Retardant Coating

In recent years, the ultra-thin fire retardant coating for steel structure is widely used for steel structures in petrochemical industry. The steel structure in petrochemical industry has not only a variety of structure forms, but also section forms, which causes problems and brings new challenges for fire retardant coating, especially the ultra-thin fire retardant coating with foaming mechanism.To study the applicability of the ultra-thin fire retardant coating used for different cross sections, the orthogonal experimental method was used in this paper. Coating types, cross section form, exposed surface and coating thickness were selected as four factors of the test, and three levels were set up corresponding to each factor. Finally, based on the requirements of the specification and market for the ultra-thin fire retardant coating, two test indicators were formulated, they were foaming ratio and test time. Under hydrocarbon fire condition, the fire resistance test was carried out to study the influence of the section form which is most concerned about, and analyzed the effect of the cross section on the fire resistance performance of the coating:the cross section is significant on the effects of foaming multiple, and for the effect on the time index, it was only less than coating thickness.The test results showed that the cross section form had positive influence on the fire resistance performance of the ultra-thin fire retardant coating. The overcast angle construction contributed to foaming, but the section form with lengthy flange could weaken the fire endurance because of its ending crack, which arouses attention.