Composite Flame Retardant Materials with Mineral Fiber for Asphalt Pavement and Their Thermogravimetric Behaviors

In order to determine the appropriate proportions of MiberⅢ mineral fiber and flame retardant in composite flame retardant material( M-FR) with mineral fiber for asphalt pavement,the flame retardancy of MiberⅢ mineral fiber is comparatively researched with limit oxygen index( LOI) method. The impact of MiberⅢ fiber content on LOI of asphalt mortar is analysed,and the impact of flame retardant content on LOI,penetration,softening point and ductility of asphalt is researched as well. The appropriate proportions of MiberⅢ fiber and flame retardant are determined by orthogonal test. The results show that( 1) the LOI of asphalt mortar increases as a S-shaped curve with the increases of MiberⅢ fiber content,and its appropriate contend should be 10%- 15%;( 2) the LOI of asphalt mortar grows linearly as flame retardant content rising,the flame retardant content also obviously influences the ductility,penetration and softening point of asphalt,and its appropriate content should less than 8%;( 3) the optimum contents of MiberⅢ mineral fiber and flame retardant in M-FR should be 15% and 6% respectively. In addition,the thermogravimetricbehavior of asphalt mortar with composite flame retardant material is analysed through thermogravimetry and differential scanning calorimetry( TG-DSC).