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Study of interface shear and shear fatigue behavior of geosynthetic-reinforced asphalt overlays


An alternative to extend the service life of flexible pavements is the use of geosynthetic reinforcements in asphalt overlays, which must have adequate bond, provided by the interface adhesion. A proper assessment of the performance of interface adhesion is essential; however, there are several test methods in the literature and lack of correlations between them, especially when geosynthetics are present. In addition, despite the fatigue failure mechanism being more realistic in pavements, as it is more complex and with several co-related influencing factors, interface adhesion analyzes are still very restricted to monotonic shear tests. In this context, the present research project aims to study the interface adhesion behavior of geosynthetic-reinforced asphalt overlays by means of interface shear and shear fatigue tests. For this purpose, a hybrid interface shearing equipment will be developed to perform static and cyclic tests. Studies will evaluate a wide variety of geosynthetic materials with different characteristics, as well as the use of different asphalt mixtures and binders, in order to compose usual combinations of the pavement rehabilitation practice. The research seeks correlations between these tests, the understanding of the main mechanisms and the multiple factors that influence the behavior of the reinforced interfaces, searching for parameters that can be used in projects. This is a condition that few studies have explored in the technical literature, and a valuable contribution to the respective area. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SILVA, MATHEUS P. S.; CORREIA, NATALIA S.; GARG, N; BHASIN, A; VANDENBOSSCHE, JM. Study on the Design Tack Coat Rate and Interface Shear Strength of Geosynthetic Pavement Interlayers. AIRFIELD AND HIGHWAY PAVEMENTS 2023: DESIGN, CONSTRUCTION, CONDITION EVALUATION, AND MANAGEMENT OF PAVEMENTS, v. N/A, p. 12-pg., . (20/16027-9)

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