Experimental Research on Mix Design and Pavement Performance for Special Basalt Fiber Reinforced OGFC Asphalt Mixture

摘要

In order to improve the stability and deformation resistance capacity of permeable open-graded friction course (OGFC) asphalt mixture, a kind of flocculent special basalt fiber with good performance is used as a reinforced stabilizer. By selecting different mixing contents of the basalt fiber, the mixture ratios of OGFC-13 were designed, then various pavement performances of the OGFC-13 mixtures under the optimum asphalt aggregate ratios were tested. The results show that the special basalt fiber can adsorb asphalt very well to bond the coarse aggregate skeleton into a solid whole; then, all the pavement performances of basalt fiber reinforced OGFC-13, including high temperature, low temperature and water stability, etc., are obviously improved. However, when the mixing content of basalt fiber is too high, a part of basalt fiber reinforced asphalt mortar will distribute in the connected voids of OGFC-13 to cause the reduction of void ratio, and a few basalt fiber with uneven dispersion is easy to form the weak points in the mixture structure, so as to influence the mixture pavement performances. Therefore, the suitable range of mixing content of the special basalt fiber is determined as 0.3%~0.5%, and the optimum mixing content is 0.4%. The results can provide references for the engineering application of permeable noise reduction asphalt pavement.