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Design method and cost-benefit analysis of hybrid fiber for asphalt concrete

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Document pages: 9 pages

Abstract: As an additive, fiber can improve the performance of asphalt concrete, which has been widely studied, but there is little research on hybrid fiber. In this paper, a new and simple hybrid fiber design method is proposed to verify the advantages of hybrid fiber in asphalt pavement engineering. Firstly, taking lignin, polyester and polypropylene fibers as examples, this paper expounds the design method and application examples of composite fibers. The shear damage energy density (sded) of hybrid fiber modified asphalt was measured by direct shear apparatus (DSD), and the composition proportion of hybrid fiber was determined by range and variance statistical analysis. Then, the engineering performance of hybrid fiber asphalt concrete (AC-13) is studied. Finaly, a cost-benefit model is developed to analyze the advantage of hybrid fiber compared to single fibers. The results show that the design method employed in this paper can offer a beneficial reference. A combination of 1.8 of lignin fiber and 2.4 of polyester fiber plus 3.0 polypropylene fiber presented the best reinforcement of the hybrid fiber. The cost-benefit model verifies that the hybrid fiber can bring about comprehensive pavement performance and good economy.

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