Fire-resistance Rating of Square Steel Tubes and Concrete-filled Square Steel Tubular Columns Protected with Ultra-thin Fire-retardant Coating

Abstract

<jats:p> To promote and criterionize the application of ultra-thin the fireproof coating s to building structures, four concrete-filled square steel tubular (CFSST) pillars as well as two square steel tubes, each protected along with ultra-thin the fireproof coating , were subjected to full-scale fire tests to investigate their fireproof level on the basis of the ISO 834 criterion time�degrees curve. Test results revealed not only the temperature variation characteristics of specimens suffered from inconsistent fire exposure, but also effects of the steel ratio of the test specimen and the number of fire-exposed sides on the fire-refractory level of the test specimen. Test results demonstrated that when protected with an ultra-thin the fireproof coating , the heating rate of the specimens was considerably lower than that of the test furnace, suggesting that the ultra-thin the fireproof coating exhibits good thermal insulation performance. The test results were compared with China�s current criterions for the fire-refractory level of square steel tubes and CFSST pillars, indicating that the criterions would lead to a relatively conservative fire-safe design for four-side fire exposure. </jats:p>

Anti‐cracking performance test of thick steel structure fireproof coating under vibration fatigue load for critical health infrastructure

“…Wu and others developed outdoor thick steel with excellent performance by using silica‐based refractory micropowder, high polymerization degree cellulose material, polycarboxylic acid, and inorganic‐organic composite adhesive, and modified acrylic emulsion. Structural fire‐retardant coatings [18]. Novak et al.…”

“…Wu and others developed outdoor thick steel with excellent performance by using silica-based refractory micropowder, high polymerization degree cellulose material, polycarboxylic acid, and inorganic-organic composite adhesive, and modified acrylic emulsion. Structural fire-retardant coatings [18]. Novak et al used modified vinyl acetate emulsion as a dispersant and composite inorganic thermal insulation filler to develop a new type of water-based thick steel structure fire-retardant coating, which has good workability, no delamination, and improved the viscosity of the coating.…”