Steel structure fireproof coating construction quality and acceptance requirements

Precautions for the Application of Fireproof Paint on Steel Structures:

1. The application of fireproof paint on steel structures must be carried out by a qualified and trained professional team with the appropriate construction license. Before starting the project, a detailed construction plan should be developed based on the specific engineering requirements and the selected coating type. It's important to test the physical and chemical properties of the coating according to the specified ratios before actual application. For intumescent fireproof coatings, it is essential to conduct foaming performance tests on different sections during the process to ensure optimal results.

2. The surface preparation of the steel base is a critical step that must be strictly monitored. All contaminants such as dust, rust, oil, and grease must be removed to ensure proper adhesion. A rust-preventive treatment should also be applied to the substrate. The primer and top coat must be compatible with each other, and the primer should not cause corrosion on the steel structure.

3. The coating thickness must meet the design specifications, with extra attention given to joints and corners. All aspects of the spraying process—such as surface preparation, joint filling, paint mixing, number of coats, quality control, and final inspection—should follow the current national standard "Technical Specifications for Application of Fire Retardant for Steel Structures" (CECS24). During the application, the coating thickness should be regularly checked using a thickness gauge. If cracks appear or the width is excessive, it’s necessary to review the process and the paint mixing ratio to identify any issues.

4. When applying fireproof paint, it's crucial to maintain the correct paint consistency, air compressor pressure, and nozzle distance from the component. During the spraying process, if splatter is observed, this may indicate improper parameters, and adjustments should be made accordingly. The amount of diluent added to the paint should not be excessive, as it can reduce the viscosity and lead to poor adhesion to the steel surface.

5. Each layer of the coating must be fully dried and cured before applying the next layer. The number of coats, the thickness of the protective layer, and the drying time should all be determined based on the construction design. The thickness of each coat should be even and moderate—too thick or uneven application can compromise the coating’s effectiveness. It’s important to strictly follow the painting procedure and avoid shortcuts that could create safety hazards just to speed up the project timeline.

6. After the project is completed, the coating thickness should be measured, but visual inspection is also important. Check the color of the coating, look for signs of cracking or leakage, and assess the overall appearance. To test the hardness, gently tap the coating with a hammer weighing between 0.75 to 1 kg. Use a 1-meter ruler to check the flatness of the coating. These checks help ensure the quality and durability of the fireproofing system.

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