Environment-friendly type flame-proof asphalt mastic stone mixture for tunnel

Abstract

The invention discloses an environment friendly type tunnel flame-proof pitch water chestnut ether broken stone mixed material, which comprises the following steps: counting with the total weight proportion of the pitch mixed material as 0. 3%-0. 5% mineral fiber, 1. 0%-1. 2% organic fire retardant, 5. 5%-6. 0% pitch, 92. 3-93. 2% broken stone; choosing the mineral fiber with the density not less than 2. 5g / cm3 and strength for extension as 3500MPa; choosing the elastic modulus of the mineral fiber as 85GPa, percentage of breaking elongation as 2. 5%, the highest working temperature at 500 deg. c and the length more than 6mm; choosing the organic fire retardant with the density at 1. 2-2. 0g / cm3 and the effective content not less than 70%; setting the fusion temperature of the organic fire retardant not less than 120 deg. c, the moisture percentage less than 5% and the fire point not less than 260 deg. c. This mixed material can prevent burning of tunnel pitch water chestnut ether broken stone mixed material (SMA) pavement effectively, which possesses environmental protection function.

Description

technical field [0001] The invention relates to a material for tunnel asphalt pavement, in particular to a pavement mixed material for solving the problems of flame retardancy and environmental protection, and belongs to the technical field of road asphalt pavement material manufacturing. Background technique [0002] 1. Investigation of tunnel fire accidents [0003] Tunnels are an important part of expressways, and are often the throat of expressways. Due to the relative closure of large tunnels, tunnel fires not only cause serious damage to tunnel facilities and tunnel structures, but also cause road traffic interruptions ranging from a few days to tens of days or even longer, and seriously threaten human life and property safety. , causing incalculable economic losses. Once a fire breaks out in the tunnel, a large amount of smoke and heat are not easy to get rid of. The tunnel is full of smoke, lighting is damaged, visibility is reduced and accompanied by high temperat...

AI Technical Summary

Problems solved by technology

On January 10, 2002, a Henan Dongfeng large truck was fully loaded with leather shoes, lighters, transparencies and other miscellaneous goods, driving from south to north to the left hole (uplink) of Maoliling Tunnel on Yongtaiwen Expressway in Zhejiang Province, 780m away from the tunnel exit When a fire broke out nearby, the entire fire lasted for about 2 hours. Although there were no casualties, it caused traffic interruption for 18 days and caused huge direct and indirect economic losses. On September 5, 2003, a car from Xishui to Guiyang The bus drove to Guizun Road 53 kilometers away and collided with a truck full of yellow phosphorus in front of it. The yellow phosphorus on the vehicle caught fire and caused the road surface to burn; on March 19, 2004, it was located in the Tashan service area of ​​the expressway Beijing direction A fuel tank truck full of 25 tons of fuel oil collided with a truck in front of it and a fire broke out. The fire burned violently, and the burning area of ​​the road surface reached 400 square meters.

However, the amount of asphalt on SMA pavement is more than 1% higher than that of general asphalt pavement, and about 0.3% (same aggregate weight ratio) of combustible lignin fiber is added as a stabilizer. All the plain fibers will play a combustion-supporting role, which increases the difficulty of tunnel fire rescue and causes greater losses

Moreover, general flame retardants will produce a large amount of smoke and toxic gases in a high-temperature environment, which not only prevents rescue work from being carried out, but also seriously pollutes the environment.