What material is sprayed onto structural steel to enhance its fire resistance?

Prepare for the Associate Contractors License Exam. Study using flashcards and multiple choice questions, each question is equipped with hints and explanations. Get exam-ready today!

The material that is commonly sprayed onto structural steel to enhance its fire resistance is gypsum. Gypsum-based fireproofing materials are widely utilized due to their effectiveness in slowing down the spread of fire and providing a thermal barrier. When applied to steel, gypsum helps to protect the structural integrity of the steel members during a fire by forming a gypsum board-like layer that insulates and maintains the steel's temperature at a level that prevents it from losing strength.

Mineral wool, while it does have certain fire-resistant properties, is not typically used in a sprayed application for steel fireproofing, focusing instead on insulation and soundproofing applications. Polystyrene foam is not fire-resistant and can burn, making it unsuitable for fireproofing applications. Concrete mixes, though they offer some fire-resistant qualities, are more commonly used as a structural element or as a concrete encasement rather than a spray-on solution. Therefore, gypsum is the correct choice when identifying materials specifically designed for spraying onto steel to enhance fire resistance.

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