Synergistic inhibition method for thermal decomposition of asphalt mixture by flame-retardant warm mixing agent

Abstract

The invention relates to a synergistic inhibition method for thermal decomposition of an asphalt mixture by a flame-retardant warm mixing agent, belongs to the technical field of asphalt pavement firesafety, and solves the problems that the synergistic flame-retardant effect of various components of the existing composite flame retardant is poor, the whole thermal decomposition process is difficult to inhibit, and the synergistic inhibition effect of the flame-retardant warm-mixing agent on flame retardance and smoke inhibition of an asphalt mixture is difficult to accurately analyze. The method comprises the following steps: firstly, preparing a nano composite flame retardant, performing vacuum adsorption on the nano composite flame retardant and a zeolite warm-mixing agent by using a vacuum adsorption method to prepare a flame-retardant warm-mixing agent, then preparing a common asphalt mixture and a flame-retardant warm-mixing asphalt mixture, and comparing combustion behaviors ofthe two asphalt mixtures by using a cone calorimeter test; using a scanning electron microscope and an energy dispersive spectrometer to analyze the microstructure and elemental composition of residues after pyrolysis of the asphalt mixture. According to the method, all the components of the composite flame retardant can be sequentially decomposed in the heating process of the warm-mixed asphalt mixture to play flame-retardant and smoke-suppressing roles, and the synergistic flame-retardant and smoke-suppressing effects are achieved.

Description

technical field [0001] The invention relates to a method for synergistically suppressing thermal decomposition of asphalt mixture by a flame-retardant warm mix agent, and belongs to the technical field of tunnel asphalt pavement fire safety. Background technique [0002] In recent years, with the rapid development of my country's transportation industry, the number of high-grade highways has gradually increased, and a large number of tunnels and tunnel groups have been built. In order to ensure the anti-skid performance of the tunnel pavement and the comfort and safety of driving, most highway tunnels use asphalt concrete pavement. In the event of a fire, there will be problems such as difficulties in evacuation of personnel, difficulty in rescue, poor smoke exhaust, and difficulty in extinguishing fires, which pose a huge threat to the safety of people's lives and property. Therefore, many scholars at home and abroad have conducted research and tests on the flame retardant...

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem that current flame retardants cannot efficiently flame-retardant the whole process of thermal decomposition of asphalt mixture, conventional test methods cannot evaluate the flame-retardant effect of flame retardants on asphalt mixture and conventional performance evaluation based on the pyrolysis mechanism of each component of asphalt The method is single, and there is a large deviation from the actual result. According to the difference in the thermal decomposition temperature range of each component of warm-mix asphalt, the present invention adopts different flame retardants and compound them to obtain a composite flame retardant. The composite flame retardant is loaded with porous zeolite During the heating process, the components of the composite flame retardant are decomposed sequentially to play the role of flame retardant and smoke suppression, and play a synergistic flame retardant effect. Quantitatively evaluate the flame retardant effect of flame retardant warm mix agent on asphalt mixture