Flame retardation and smoke suppression scheme designing method in whole thermal decomposition process of tunnel asphalt pavement

Abstract

The invention provides a flame retardation and smoke suppression scheme designing method in the whole thermal decomposition process of a tunnel asphalt pavement, belongs to the technical field of tunnel fire safety, and solves the problem that flame retardation and smoke suppression are difficult to conduct by using an existing flame retardant and smoke suppressant in the whole thermal decomposition process of tunnel asphalt pavement. Firstly, four components of asphalt are prepared, and the thermal decomposition temperature intervals and graded distribution characteristics of the four components are found; a thermal decomposition kinetic model about the four components is established, thermal decomposition kinetic parameters of the components are calculated, and the thermal decomposition performance of the four components is quantitatively evaluated; a flame retardant and smoke suppressant with the thermal decomposition temperature matched with the thermal decomposition temperature intervals of the four components is preferentially selected, and the type and addition amount of the flame retardant and smoke suppressant are determined; according to the contents of the four components, a compositional scheme for the flame retardant and smoke suppressant is proposed; the flame retardation and smoke suppression effects on the tunnel asphalt pavement and influence on pavement performances of the composited flame retardant and smoke suppressant are investigated, the compositional scheme is optimized, and the best addition amount and addition mode of the composited flame retardant and smoke suppressant are determined. According to the method, efficient flame retardation and smoke suppression in the whole thermal decomposition process of the tunnel asphalt pavement are achieved, and fire safety is improved.

Description

Technical field [0001] The invention is a method for designing a flame-retardant and smoke-suppressing scheme in the whole process of thermal decomposition of tunnel asphalt pavement, and belongs to the technical field of tunnel fire safety. Background technique [0002] With the development of highways in my country and the acceleration of urbanization, the number of tunnels is increasing. Since 2011, the average annual net increase of road tunnels has exceeded 1,000km. By the end of 2015, China had 12,404 road tunnels with a total length of 1,0756.7km, making it the country with the largest number of tunnel construction projects in the world. At the same time, the frequency of tunnel fire accidents is also on the rise. Tunnel fires will not only cause serious damage to the overall structure of the tunnel and the internal facilities of the tunnel, cause serious road traffic interruption, but also threaten people's lives and property. Asphalt concrete pavement is more and more w...

AI Technical Summary

Problems solved by technology

[0011] For the current flame retardant and smoke suppressant can only play a flame retardant role in a certain thermal decomposition stage of asphalt, and cannot carry out multi-stage flame retardant and smoke suppression on the thermal decomposition of asphalt, and it is difficult to efficiently carry out the whole process of thermal decomposition of asphalt pavement in tunnels. For the problem of flame retardancy and smoke suppression, the gradient distribution characteristics of the combustion characteristics of each component of asphalt and the volatiles of the emitted gas are studied by using multidisciplinary methods, TG-DSC-FTIR joint measurement, scanning electron microscope, energy spectrum analysis and other testing methods According to the release law of asphalt components, the influence of the combustion characteristics of each component of asphalt on the combustion performance of asphalt is revealed, and the environment-friendly inorganic flame retardant and its addition amount matching each component are determined based on the level of asphalt components. Composite the selected inorganic flame retardants, establish a composite asphalt flame retardant and smoke suppression system, and carry out flame retardant and smoke suppression in the whole process of asphalt thermal decomposition, so that the tunnel asphalt pavement has good flame retardant and smoke suppression performance and road performance