Abstract
In this paper, perlite was used as a kind of modifier to prepare waterborne fire resistive coatings for steel structure. The influence of perlite on the properties of the fire resistive coatings was investigated with the help of thermogravimetric analysis (TGA), micro-scale combustion calorimetry (MCC) and fire protection test. The TGA results showed that the char residue weight of the coatings was increased when perlite was loaded and the anti-oxidation performance was enhanced as well and MCC data indicated the addition of perlite reduced the peak heat release rate and total heat release. After the fire protection test, the results confirmed that the fire resistant time of the coating coated with 5 wt% perlite increased up to 114.4 min when the temperature of the sample boards’ backside reached 500?C.
Highlights
Steel structure has been widely used in some super high-rise or long-span buildings, such as commercial buildings, railway stations and airports
The thermogravimetric analysis (TGA) results showed that the char residue weight of the coatings was increased when perlite was loaded and the anti-oxidation performance was enhanced as well and micro-scale combustion calorimetry (MCC) data indicated the addition of perlite reduced the peak heat release rate and total heat release
Mariappan et al [7] investigated titanium dioxide (TiO2) on the thermal insulation performance of waterborne intumescent coatings, and the results showed that the ratio between TiO2 and ammonium polyphosphate (APP) played an important part in the comprehensive properties of the intumescent coatings
Summary
Steel structure has been widely used in some super high-rise or long-span buildings, such as commercial buildings, railway stations and airports. When the temperature exceeds 500 ̊C, steel will lose its bearing capacity and cause accidents such as building collapse, resulting in the terrifying loss of human lives and property. The fire protection of steel structure is a very significant task. Using intumescent coatings is one effective way to provide passive fire protection for steel structure. The intumescent fire resistive coatings for steel structure are composed of binders, expansion system, fillers and additives, such as curing agent, defoamer and solvent.
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