Papers by Keyword: Fireproof Material

Abstract: This paper studies the behaviors of carbon fiber reinforced plastics (CFRP) confining concretes exposed to fire, acid or alkaline environments. The concrete specimens wrapped with CFRP were exposed to different high temperatures or submerged to acid or alkaline solutions with different concentrations. All the specimens were then loaded under uni-axial compression test. The strength and ductility of concrete specimen were evaluated. The environmental influences on the confining effects of CFRP were also investigated. The results indicate that CFRP reinforcements can provide good confinements for concrete specimens, so both the strength and ductility of concrete specimens can be significantly increased. But CFRP confining concrete specimens exposed to fire environments over 300°C will lose some of the confinements and the strength and ductility are significantly decreased. When adhered by fireproof material, CFRP confining concrete specimens exposed to fire environments will not lose all the confinements and still retain most of their original strengths and strains. The fireproof material can really protect CFRP confining concretes from high temperatures. The fire resistance effect of fireproof material depends on its thicknesses and the fire environments. The results also show that CFRP confining concrete specimens when submerged into acid or alkaline environments will lose some of the confining effect of CFRP. The higher the concentration or the longer the soaking period of acid or alkaline environments, the more the CFRP material is damaged and thus CFRP confining concrete specimens lose some of their strenghs.

Abstract: In order to look into the causes of fire response and post-fire bearing capacity of the steel tubular columns protected with different materials, the fire test was conducted for a set of circular steel tubes protected with different materials such as gypsum fireproof panel, bamboo plywood and the ordinary lumber core plywood, and the steel tube without any protective material. The fire response temperature of surface of steel tubes is measured and the axial compressive bearing capacity of the specimens after fire are tested and analyzed. The test results show that gypsum fireproof panel has the best fire protection characteristics, the ordinary lumber core plywood and bamboo plywood can also retard rising of the surface temperature of the steel tubes during the initial 35min although they are combustible materials. It is found that the post-fire bearing capacity of the steel tubes protected with different materials varies evidently, and the maximum value of response temperature has the greatest effect.

Abstract: This study tested four types of fireproof and stuffing materials, including firestop sheets, silicone fire barrier sealant, mineral wool batt, and double agent fire barrier foam, on through-floor pipes and walls. Based on the specifications of the American society for testing and materials (ASTM) E84, a 10 min substrate surface burning test was conducted to test fireproof and stuffing materials. The results indicated that the level of fireproof material substrates reached the level of class A in ASTM E84. Combination methods A and B were tested by 180 min heating for specimens, according to the ASTM E814 standard temperature-time (T-t) heating curve, followed by the water spraying test. The results showed that methods A and B have 180 min of fire prevention effects (F rating), and method B can achieve 180 min of heat prevention effects (T rating).