Abstract
This research deals with mechanical tests and structural analyses of a pre-designed asphalt pavement, considering scenarios in which the wearing course is unreinforced or reinforced with geogrid. The experimental program included the design of two hot mix asphalts. Reinforced specimens were produced with three different types of paving geogrids. Mechanical tests of tensile strength and resilient modulus were carried out, as well as structural analyses of the pre-designed pavement, varying the resilient stiffness of the wearing course. It provided the maximum horizontal tensile stresses and strains that were used to evaluate the fatigue response of the reinforced and unreinforced asphalt pavements, according to different fatigue models. The results of the mechanical tests showed that the reinforced mixtures presented higher values of tensile strength and resilient modulus than unreinforced asphalt mixtures. Regarding the effects of reinforcement geogrids on the structural performance of the asphalt pavements, the results indicated that despite the tendency for higher maximum horizontal tensile stresses in lower fibers, the wearing course of asphalt mixtures with geogrids exhibited a reduction in specific tensile strains. Consequently, a tendency for longer fatigue life was verified. In addition to conventional reinforcement mechanisms, the pre-stressing or pre-tensioning of the geogrid due to compaction is also assumed to account for the superior structural performance of reinforced asphalt mixtures. The mechanical properties of the reinforced asphalt mixes and their corresponding structural pavement responses were found to be dependent on the type of geogrid, the grading zone of aggregate and the binder contents of the asphalt mix that composes the wearing course.
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This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001.
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PEREIRA, G.S., PITANGA, H.N., da SILVA, T.O. et al. Structural Analysis of Pavements with Geogrids-Reinforced Wearing Courses. Int. J. Pavement Res. Technol. 16, 662–677 (2023). https://doi.org/10.1007/s42947-022-00155-0
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DOI: https://doi.org/10.1007/s42947-022-00155-0