Abstract: Mixing the polyester fibers，polyacrylonitrile fibers and methyl cellulose respectively into three different gradation types asphalt mixtures：AC，SMA and OGFC，the fiber-reinforced asphalt mixtures were formed.Based on the performances tests of the fiber-reinforced asphalt mixtures，such as Marshall stability，high temperature rutting，low temperature crack resistance，water stability，skid resistance etc。the strength-mechanism of the fiber-reinforced asphalt mixtures was analysed .Contrasting with the testing data of common asphalt mixtures，all the three kinds of fiber-reinforced asphalt mixtures performances have improved,and the improvement of polyester and polyacrylonitrile fibers is greater than that of methyl cellulose.In accordance with rutting test data，the optimal designed content of fiber is presented in different traffic.Due to marked economic benefit brought by the fiber-reinforced asphalt mixtures-increasing road life and reducing maintenance costs，it would be applied comprehensively and developed quickly.

Key words: polyester fibers, polyacrylonitrile fibers, methyl celulose, bitumi nous mixtures, mechanism of strength, designed content offiber, economic benefit

摘要： 在AC、SMA、OGFC3种级配形式的沥青混合料中分别掺加国产聚酯纤维、聚丙烯腈纤维和木质素纤维。测定纤 维沥青混合料的路用性能，包括混合料马歇尔稳定度、高温稳定性、低温抗裂性、水稳性、渗水性和抗滑性能，分析了 纤维增强沥青混合料强度形成机理．与无纤维沥青混合料试验结果进行对比，3种纤维沥青混合料的路用性能都有 不同程度的提高，聚酯纤维与聚丙烯腈纤维的综合改善性能优于木质素纤维．通过车辙试验。确定了聚酯纤维满足 不同交通量下的设计用量．技术经济分析表明，纤维沥青混合料经济效益明显，具有良好的应用前景．

关键词: 聚酯纤维, 聚丙烯腈纤维, 木质素纤维, 沥青混合料, 强度形成机理, 设计用量, 经济效益