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Fire retardant coating for tunnel

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Fire Retardant Coating

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Core Performance and Features

Efficient thermal insulation: the coating has low thermal conductivity, which can effectively delay the transfer of heat to the concrete structure in case of fire and prevent its strength from declining rapidly at high temperature.
High adhesion and durability: strong adhesion with concrete base material, moisture resistance, acid and alkali resistance, and the coating is not easy to crack and fall off.
Safety and environmental protection: most of them are water-based formulas, which do not produce toxic smoke in case of fire and are harmless to human body and environment.
Additional function: the coating is porous and has certain sound-absorbing and silencing effects.

Construction Method

1. Base course treatment

Remove the floating dust and oil stain on the concrete surface, and repair and waterproof the honeycomb, pitted surface and water leakage.
Especially smooth surfaces need to be roughened or chiseled to enhance adhesion.
Before construction, the base surface should be watered and wetted.

2. Paint preparation

Pour the paint into the water in strict accordance with the product instructions (for example, the mass ratio of water to paint is about 0.7: 1), and stir while adding.
Fully stirring for 10 to 20 minutes to form uniform thick slurry.
The stirred slurry should be used up within 1-2 hours, and water should not be added twice.

3. Spraying construction

Environment: The ambient temperature should be above 5 ° C.
Methods: Spraying was carried out by using extrusion grouting pump and air compressor. Spray from bottom to top from the tunnel waist.
Thickness: The thickness of each time of spraying is about 3-7 mm, and the interval time is subject to the surface drying of the previous time of coating (usually not less than 24 hours), and the construction is circulated until the total thickness of the design is reached.

4. Surface and maintenance

If it is necessary to trowel or meet the decorative requirements, it can be troweled after the last spraying, or the decorative surface layer can be constructed after the base layer is completely dry (about 3 days later).
Natural curing is required for 28 days after construction, and the conditions are the same as those of ordinary concrete.

Technical Parameters

No.	Inspection items	Standard clause number	Standard requirements	Inspection results	Conclusion
1	Fire resistance (standard temperature rise)	GB 28375-2012	≥2.00h (standard temperature rise); temperature at any temperature measuring point on the bottom of concrete slab ≤ 380 ℃; temperature at any temperature measuring point on the bottom of 25mm protective layer reinforcement mesh in concrete slab ≤ 250 ℃	The coating thickness is 22mm; the fire resistance test time is 3.00h; the maximum temperature on the bottom surface of the concrete slab is 286 ℃; Maximum temperature of 205 ° C above the underside of the 25 mm cover fabric in the concrete slab	Qualified
2	Status in container	GB 28375-2012	After being stirred, the liquid is uniform and thick without caking.	Meet the requirements	Qualified
3	Drying time (surface drying)/H	GB 28375-2012	≤24	8	Qualified
4	Bond Strength (MPa)	GB 28375-2012	≥0.15 before freezing and thawing; ≥ 0.15 after freezing and thawing	0.42 before freezing and thawing; 0.40 after freezing and thawing	Qualified
5	Dry density/ (kg/m ³)	GB 28375-2012	≤700	596	合格 Qualified
6	Water resistance/H	GB 28375-2012	≥720, the coating shall be free from cracking, delamination and peeling after the test, and slight swelling and discoloration are allowed.	720, as required	Qualified
7	Acid resistance/H	GB 28375-2012	≥360. After the test, the coating shall not crack, peel off or fall off, and slight swelling and discoloration are allowed.	360, as required	Qualified
8	Alkali resistance/H	GB 28375-2012	≥360. After the test, the coating shall not crack, peel off or fall off, and slight swelling and discoloration are allowed.	360, as required	Qualified
9	Moisture and heat resistance/H	GB 28375-2012	≥720, the coating shall be free from cracking, delamination and peeling after the test, and slight swelling and discoloration are allowed.	720, as required	Qualified
10	Freeze-thaw cycle resistance test/time	GB 28375-2012	≥15. After the test, the coating shall not crack, peel off or fall off, and slight swelling and discoloration are allowed.	15, meet the requirements	Qualified
11	Smoke-producing toxicity	GB 28375-2012	Not lower than hazard classification ZA of smoke toxicity specified in GB/T 20285 2006	Class ZA	Qualified