With the highway gradually extending to mountain areas in our country, the number ofhighway tunnels is growing. Due to its superiorities of driving safety and comfort, etc,asphalt pavement is becoming the main trend in the tunnel of highway and urban road.However, with the single length and integral dimensions of tunnel increased constantly, theprobability of fire in the tunnel gradually increased as well, the security issues caused by firehave been attracting more and more attention. Therefore, develop flame retarded material andreduce the lost of lives and property when tunnel fire broke out are very important.Adopting MiberⅢ mineral fiber which has flame retarding property and compositeflame retardant, the physical technical properties and road performance of MiberⅢ fiber areanalyzed, and the flame retarding property of MiberⅢ fiber is studied with limit oxygenindex test. The results show that MiberⅢ fiber is apply to asphalt pavement, and compared toother common fiber, it has obvious flame retarding effect; the impact of MiberⅢ fibercontent on limit oxygen index(LOI) of asphalt mortar is researched, so as to the impact ofcomposite flame retardant content on LOI, ductility, penetration and softening point ofasphalt. And then using orthogonal test, the appropriate proportions of MiberⅢ fiber andcomposite flame retardant are determined(M-FR). After that, adopting smoke density test,Thermogravimetry, Difference Scanning Claorimetry, the flame retarding property and smokeretarding property of three kinds of M-FR asphalt mortar are researched.Using temperature sweep test, frequence sweep test, repeated creep test, force ductilitytest and bending creep stiffness test, three kinds of M-FR asphalt mortar, as well as MiberⅢfiber and cellulous fiber asphalt mortar are researched contrastively. The results show thatM-FR can greatly improve the high temperature stability, but increase stiffness modulus atlow temperature as well. After mix design based on SMA-13and0.5%MiberⅢ fiber content,material compositions of flame retarded asphalt mixture with mineral fiber are proposed. Andthen the road performances are studied by contrast with0.3%cellulous fiber content asphaltmixture. The results prove that MiberⅢ mineral fiber is suitable to asphalt mixture. Directand indirect methods are designed to research the flame retarding property of asphalt mixture. The test results strongly prove that the conclusion of LOI test of asphalt mortar, and accountfor the obvious flame retarded effect of asphalt mixture. |