Research on the Preparation and Application of Bagasse Fibers for Pavement
Regarding the fibrous properties of bagasse and the performance requirements of fibers used in asphalt pavements,focusing on the key technical issues about the preparation of sugarcane bagasse fibers,a dual-screw shear device is developed to facilitate the preparation of bagasse fibers.The preparation process is explored,and the fundamental performances of the fibers for asphalt pavement are evaluated.Advanced testing techniques including scanning electron microscopy,infrared spectroscopy,and thermogravimetric analysis are employed to study the microstructure,chemical composition,and thermal stability of the bagasse fibers respectively.Furthermore,mixture design and road performance tests are conducted for AC-13 and SMA-13 asphalt mixtures incorporating bagasse fibers,followed by their application in asphalt pavement.The test results indicate that the proposed scheme for processing bagasse fibers using the dual-screw shear device is not only feasible but also recommended to be conducted via a wet preparation method.In term of the preparation efficiency and technical requirements of fibers for pavement,optimum technology parameters are suggested as follows:24 h soaking duration,4 min shearing duration and 1∶3 mass ratio of wet bagasse and water.It is confirmed that the prepared bagasse fibers met the technical requirements of lignin fibers for pavement according to the specification.Structurally,these fibers are composed of parallel microtubes formed by multiple layers of fiber walls,possessing better ability to adsorb light oil fractions in asphalt,and thereby enhance the bonding performance between the binder and aggregates.The chemical structure of the bagasse fibers closely resembles that of lignin fibers,though with a slightly higher lignin content.The thermogravimetric curves of both fibers are approximately similar,while the bagasse fibers display a distinct double-peak structure in the derivative thermogravimetric curves.Remarkably,the asphalt mixtures with bagasse fibers like the AC-13 or SMA-13 have demonstrated exceptional performances.The construction craft for these mixtures is similar to the asphalt mixture containing lignin fibers,which has shown satisfactory performance in the experimental sections.In short,these research findings lay a good foundation for the large-scale application of bagasse fibers.
road engineeringasphalt pavementfiber reinforcedbagasse fiberpreparation and structureroad performance
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