The acceptance method and standard of fireproof coating in steel structure

First, the steel structure fire protection coating introduction
steel structure fire protection coating refers to the application of the building structure on the steel structure surface, can form a fire-resistant thermal protection layer and improve the steel structure fire resistance limit of the coating.
01
structure fire protection coatings can be divided into:
1) indoor steel structure fire protection coatings, can be used in buildings indoor or hidden works of steel structure surface.
2) Outdoor steel structure fire protection coating, which can be used on the surface of steel structure for outdoor or open-air construction of buildings
the
. Steel structure fire protection coating according to the thickness of use can be divided into:
3) ultra-thin steel structure fire protection coating, coating thickness is less than or equal to 3mm.
4)
-type steel structure fire protection coating, coating thickness greater than 3mm and less than or equal to 7m
m.
5)
steel structure fire protection coating, coating thickness greater than 7mm and less than or equal to 454mm.
, steel structure fire protection paint construction quality control
1. The appearance of the coating before construction: the state in the container;
2. Physical and mechanical properties after construction: drying time, appearance and color, initial
drying cracking resistance, bonding strength, pressure strength, dry density, etc.;
3. Durability of coatings after construction: water resistance, heat and cold cycle resistance, heat resistance, moisture and heat resistance, freezing and melting cycle, acid resistance, alkalinity, salt spray corrosion resistance, etc.
4.
fire resistance of the coating after construction:
coating thickness and fire resistance limit.
, steel structure fire protection coating acceptance method
1.
visual inspection method:
detection of paint varieties, color glue cracks and so on.
2.
tool detection method:
with thickness needles or calipers to detect the thickness of the coating, with 0.75-1kg hammer tap coating its strength and empty drum phenomenon, with a 1m ruler to detect coating straightness.
, steel structure fire protection coating acceptance standards
1. the thickness of the
coating should meet the design requirements, if the thickness is lower than the original standard, must be greater than 85% of the original standard, and the length of the continuous area of the insufficient thickness is not greater than 1m, and no longer in the 5m range of similar situations.
2.
coating should be completely closed and should not be exposed or leaky.
3.
should not appear cracks, if there are individual cracks its width should not be greater than 1mm.
4.
between the coating and the steel substrate and between each coating should be firmly bonded, no empty drum, peeling and loose, etc.
5.
coating surface should be dairy-free, there are appearance requirements of the site, bus not straightness and loss of garden degree full deviation should not be greater than 8mm.
, steel structure fire protection coating acceptance summary
1.
inspection items that can be carried out on steel structure fire protection coatings at the construction site include: status in the container, appearance and color, initial drying resistance, coating thickness.
2.
fire resistance is the most important technical performance of steel structure fire protection coating, coating thickness is a key performance index to quickly detect the construction quality of steel structure fire protection coating at the construction site.
3.
the actual spray thickness of the steel structure fire-resistant coating can not be adjusted, it must be determined according to the detection data of the fire resistance limit.
4.
quality testing at the construction site, whether the coating thickness meets the design requirements should be based on the test data of the fire resistance limit of the batch steel structure fireproof coating.
5.
the coating thickness test at the construction site, the coating thickness of the component should be measured by the average of all measuring points of a single component. Whether the coating thickness meets the design requirements is determined on the basis that the coating thickness should meet the thickness requirements of the coating inspection report, and that the fire resistance limit of the inspection report should not be lower than the design fire resistance limit of the coated component.
6.
thick and thin steel structure fire protection coating can consider the difference between laboratory technical conditions and construction site, and take 85% guarantee rate for coating thickness calculation. The calculation of ultra-thin steel structure fire protection coating can take 85% guarantee rate for coating thickness calculation, still need a lot of test demonstration, in order to draw scientific conclusions.