Fireproof coating for tunnels

Abstract

The invention discloses a fireproof coating for tunnels. The fireproof coating comprises the following raw materials in parts by weight: 5-70g of high-alumina cement, 5-70g of ordinary Portland cement, 1-10g of redispersible rubber powder, 9-32g of expanded perlite, 7-33g of expanded vermiculite, 5-15g of hollow beads, 15-35g of light calcium carbonate, 2-12g of bentonite, 2-9g of sepiolite, 1-10gof aluminum silicate fibers, 4-25g of a flame retardant smoke inhibitor, 2-15g of aluminum hydroxide, 3-10g of magnesium hydroxide and 2-10g of sodium tetraborate. According to the invention, throughnon-inflammability and low thermal conductivity of the material and heat absorption performance of the material in a coating layer, the heat rising speed of steel bars is delayed, fire resistance isimproved, the fire resistance limit is enhanced, and bonding strength between the coating and inner walls of the tunnels is enhanced. Fire prevention treatment is effectively carried out in the tunnel, loss caused by external fire is reduced, and repair cost is reduced.

Description

technical field [0001] The invention relates to the technical field of fireproof coatings for tunnels, in particular to a fireproof coating for tunnels. Background technique [0002] In architecture, an underground artificially constructed channel with a cross-sectional area of ​​more than 30 square meters is defined as a tunnel. Tunnels not only undertake the task of transportation, but also function as channels for optical cables, cables, and even oil and water pipelines. Although the reinforced concrete components used as the main building in the tunnel are non-combustible materials, the tunnel fire has the characteristics of a rapid rise in ambient temperature after combustion, a long duration, a large fire range, and difficulties in fire fighting and entry. In a short period of time after the fire broke out, the local temperature of the fire site in the tunnel will rise rapidly to 1000°C. As the temperature continues to rise, the bound water in the concrete will turn i...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are many studies on fireproof coatings for tunnels. Patent No. CN106630872A discloses a special fireproof coating for tunnels. By adding epoxy-terminated polyetheramine and polybenzimidazole, epoxy-terminated poly Ether amine contains a large number of hydroxyl groups, which can greatly improve the adhesion between the coating and the substrate, and improve the aging resistance of the coating. Through sulfonation and β-cyclodextrin modification, it can greatly improve its compatibility with the system, and It can greatly increase the cross-linking density of the system and improve the bonding force and strength. However, researchers have found that although this fire-resistant coating can improve the bonding strength, it has a poor fire limit and is inconvenient for long-term fire protection of tunnels.

[0005] Patent No. CN108640567A discloses an environmentally friendly fireproof coating for tunnels. The coating has excellent fire resistance, corrosion resistance and stability, is safe and non-toxic, has a short curing time, is convenient for construction, and has high efficiency. The junction strength is low, and the coating cannot be effectively bonded to the inner wall of the tunnel. After a long period of use, it is easy to fall off