Steel fire-retardant paint construction quality The main problems: Fire-resistant paint is through the construction of workers painting the surface of the steel structure, only to complete the entire process of steel fire-retardant paint. Fire retardant paint construction is secondary fireproof paint production process, if improper construction will also affect the quality of steel structure fire retardant paint. Construction of the main problems,
First, the construction team does not have the appropriate construction qualification, technical strength is not weak.
The second is to ignore the surface of the substrate cleaning, fire retardant paint performance.
Third, there is no scientific construction plan before construction. Construction quality can not be tested strictly according to technical standards during construction.
Fourth, the pursuit of appearance and finish, polish the coating or paint the exterior of the fire-retardant coating ordinary decorative coatings, resulting in the technical performance of the coating is difficult to guarantee.
Fifth, the completion and acceptance of fire retardant paint is only relying on the naked eye observation and the thickness of the coating test, the lack of strict acceptance criteria and testing methods.
Steel fire-retardant paint construction precautions:
1, fire protection of steel structure should be protected by a qualified training and construction of qualified construction team construction. According to the project characteristics and product selection to develop a rigorous construction program. Paint the physical and chemical properties according to the project needs before the project carried out according to the provisions of the sampling rate. The expansion of fire-retardant paint in the construction should choose different parts of the test foam performance,
2, fire-resistant substrate surface cleaning should be strictly examined as a procedure. Remove dust, iron filings, rust, grease, and other substances that prevent adhesion, and make the substrate rust-proof. Fire paint in the bottom and surface coatings should be supporting the underlying paint shall not rust steel.
3, the thickness of the coating should reach the design value, the node should be made thickening treatment. Spraying site requirements, component surface treatment, joint filling, paint preparation, spraying number, quality control and acceptance shall comply with the current national standard "Application of fire-resistant steel paint Technical Specifications" (CECS24) requirements. The thickness of the coating should be checked at the construction side (measured by gage). If the coating is common and wide cracks, should be studied and analyzed the process is correct, the coating mix is reasonable.
4, fire-resistant paint spraying To master the consistency of the paint, air compressor pressure and spray jet-throat and component distance. The main observation during construction, splashes and more show that the construction parameters are unreasonable and should be adjusted. Coating dosage of diluent can not be too much, otherwise it will reduce the normal coating viscosity, paint can not be attached to the surface of the steel structure.
5, in the paint construction process, must be in the previous coat basic dry curing, and then again after construction. Coating protection, the number of construction and protective layer thickness should be based on the construction design requirements, each time the thickness of the coating should be moderate, should not be too thick or not rolled uniform, so as not to affect the coating quality. In strict accordance with the painting process, should not grab the construction period to leave security risks.
6, the project can not be completed only after the completion of the coating thickness measurement, but also with the visual method to detect the coating color and leakage and cracks, with 0.75 ~ 1kg hammer tap coating to detect its intensity, with 1m ruler detection Coating flatness.
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