Tunnel fire-proof paint

Abstract

The tunnel fireproofing material consists of sulforaluminate cement 30-50 wt%, inorganic heat insulating stuffing expanded perlite 5-30 wt%, expanded vermiculite 13-40 wt%, kaolin 5-15 wt%, aluminum hydroxide 5-20 wt%, magnesium hydroxide 0-25 wt%, diatomite 0-3 wt%, mine slag 0-10 wt%, redispersible glue powder 2-10 wt%, water reducing agent 0.1-2 wt%, expanded fire retardant 0-1 wt%, reinforcing fiber 0-1 wt%, setting retarder 0-5 wt% and setting accelerator 0-3 wt%. The tunnel fireproofing material has the advantages of high water resistance, high weather resistance, high fire resistance, high corrosion resistance, high stability and other advantages.

Description

technical field [0001] The invention relates to a kind of fireproof coating, in particular, relates to a kind of tunnel fireproof coating. technical background [0002] With the rapid development of highway and railway construction, tunnels have become common buildings in modern traffic engineering. With the development of the economy, the scale of my country's traffic engineering construction is getting larger and larger, the number of tunnels is increasing, and the mileage of tunnels is getting longer and longer. Due to the particularity of the tunnel building structure, the environment is relatively airtight, and the traffic density is high. Once a fire breaks out in the tunnel, it is very difficult to extinguish the fire, and most of the tunnel buildings are reinforced concrete structures, which are not resistant to high temperatures. Once a fire occurs, the temperature will increase rapidly. Reinforced concrete Cracks will occur at high temperatures until the strength ...

AI Technical Summary

Problems solved by technology

Silicate cementitious materials have poor corrosion resistance, poor penetration resistance, large shrinkage, and easy to return to frost; high-alumina cement cementitious materials have good fire resistance, but due to the unstable microstructure of the material, they are prone to shrinkage, resulting in cracking and peeling off of the coating layer

[0005] As far as the overall situation of the existing tunnel fireproof coating is concerned, there are the following defects: (1) The coating is thick and the heat insulation performance is not good. Generally, the thickness is 20-30mm, and the fire resistance can reach 3h. Due to the large thickness, the construction is difficult and the construction period is long ; In addition, increase the structural load and increase the cost of tunnel construction; (2) The bond strength is low, the bond strength of the thick steel structure fireproof coating is only 0.115MPa, when the vehicle passes, it will generate vacuum, strong wind and vibration, and it is easy to fall off; ( 3) Poor weather resistance. Due to water seepage, the tunnel is in a humid environment for a long time. The coating is easy to return to brine and frost, and freezes in winter, causing the coating to powder, damage, and fall off; (4) Poor safety, such as ammonium polyphosphate foaming Flame retardant, in the process of fire foaming and flame retardant, a large amount of ammonia and smoke are produced, which reduces the oxygen in the tunnel space, increases the risk of suffocation of the victims in the tunnel, and increases the difficulty of fire fighting