混掺纤维改性沥青混合料的路用性能试验研究

Experimental Study on Road Performance of Mixed Fiber Modified Asphalt Mixture

将不同掺量的玄武岩纤维(BF)和聚丙烯纤维(PP)单掺、混掺至沥青混合料中进行改性,采用高温车辙、低温小梁弯曲、浸水马歇尔、冻融劈裂及弯曲疲劳等室内试验,研究桥面铺装AC-20级配沥青混合料的使用性能。结果表明:BF纤维能够有效提升沥青混合料的强度和硬度,而PP纤维可以提供沥青混合料更好的柔性与黏性;单掺BF纤维可以有效改善沥青混合料的高温稳定性能、低温抗裂性能以及抗疲劳性能,单掺PP纤维仅改善水稳定性能的效果优于BF,而通过采用合理比例的BF与PP纤维混掺改性可综合提升沥青混合料的服役性能及使用寿命。

Basalt fiber(BF)and polypropylenefiber(PP)withdifferent content weremixed into asphalt mixturefor modification and the high temperature rutting,low temperature trabecular bending,immersion Marshall,freeze-thaw spliting and bending fatigue were used.Laboratory tests were carried out to comprehensively investigate its road performance.the modification of AC-20 grade as phalt mixture for bridge deck pavement was studied.The results show that basalt fiber can effectively improve the strength and hardness of asphalt mixture,while PP fiber can provide better flexibility and viscosity of asphalt mixture.Single-doped BF fiber can effectively improve the high temperature stability,low temperature crack resistance and fatigue resistance of asphalt mixture.The effect of single-doped PP fiber on improving water stability is better than that of BF,and the service performance and service life of asphalt mixture can be comprehensively improved by using a reasonable proportion of BF and PP fiber.