Method for evaluating flame retardant efficiency of asphalt

Abstract

The invention discloses a method for evaluating the flame retardant efficiency of asphalt, belonging to the technical field of an asphalt pavement and solving the problem that a method for evaluating the flame retardant efficiency of the asphalt is difficultly accurately quantified by using an existing flame retardant. According to the method, based on the combination of a thermogravimetry-differential thermal analysis synchronous test and a thermal analysis kinetics theoretical equation, the flame retardant efficiency of a flame retardant to the asphalt is quantificationally evaluated. The method comprises the steps of: respectively testing the asphalt and prepared flame-retardant asphalt by adopting a thermogravimetry-differential thermal analyzer to obtain test data such as TGs (Thermal Gravity), DTGs (differential thermogravimetry), DTAs (Differential Thermal Analysis) and char yields; secondly, drawing curves of 1n[g(alpha) / T2] to 1 / T according to the thermal analysis kinetics theoretical equation, and determining reaction mechanism functions g(alpha) in the thermolysis process of the asphalt and the prepared flame-retardant asphalt through linear fitting of a least square method; thirdly, drawing a straight line of the 1n[g(alpha) / T2] to the 1 / T, solving kinetics parameter activation energies E and frequency factors A through a slope and an intercept; finally, comparing the E and the A of the asphalt with the E and the A of the prepared flame-retardant asphalt so as to completely and accurately evaluate the flame-retardant efficiency of the flame retardants with different types and doping quantities to the asphalt.

Description

technical field [0001] The invention relates to a method for accurately evaluating the flame retardant effect of a flame retardant on asphalt based on the combination of thermogravimetric-differential thermal synchronous test and thermal analysis kinetic theory calculation, and belongs to the technical field of road asphalt pavement. Background technique [0002] With the rapid development of highway construction, there are more and more highway tunnels. Asphalt pavement is widely used in long and large tunnels because of its advantages such as comfortable driving, good skid resistance, low noise, short construction period, and convenient maintenance. Because asphalt will pyrolyze and burn in the high-temperature environment of tunnel fire, and release a large amount of toxic smoke and heat, causing serious secondary disasters and bringing great difficulties to personnel escape and fire rescue. Therefore, the research on the flame retardancy of tunnel asphalt pavement has b...

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Problems solved by technology

It also reflects the activity of the substance. If the frequency factor is large, it means that the asphalt has strong activity and needs more energy to activate the reaction and promote the reaction. Therefore, this kind of asphalt has good thermal stability and is not easy to thermally decompose and burn; on the contrary, if The frequency factor is small, indicating that the activity of the asphalt is weak, requiring less energy to activate the reaction and promote the reaction, so the thermal stability of this kind of asphalt is poor, and it is easier to thermally decompose and burn

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