Abstract
The manufacturing cost of asphalt flame retardant is very expensive since it mostly comprises halogen, stibonium and boron composite system. As a result, its use is restricted. In this paper, three kinds of cheap phosphorus, nitrogen flame retardants and two kinds of inorganic flame retardants for modifying asphalt. Based on limit oxygen index, the effect of one-component and multicomponent flame retardant on asphalt flame-retardant performance was analyzed. Moreover, in phosphorus-nitrogen-aluminum and phosphorus-phosphorus-aluminum flame-retardant experiments, it was found that phosphorus-aluminum composite system also has good flame-retardant effects, and the optimal proportion was obtained. The experiments validated that its flame-retardant performance can reach difficult flammable level-2 standard, fully satisfying the use need of tunnel surface, and substantially reducing the technical-economic cost of flame-retardant asphalt. FRC index proposed in this paper takes into full consideration the flame-retardant performance and economic cost for modification of asphalt, and provides important reference to the selection of master plan.
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