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Introducing an improved testing method to evaluate the fatigue resistance of bituminous mortars

Book Contribution - Chapter

An improved test is proposed to determine the fatigue resistance of bituminous mortars by applying time-sweep cyclic (oscillatory) tests using a dynamic shear rheometer (DSR). To evaluate its applicability, a bituminous mortar mixture derived from a dense asphalt concrete (AC) mix was utilized. The objectives of this study were twofold; firstly, to design a new geometry that ensures higher repeatability of measurements and failure at a predefined zone. Secondly, to provide a methodology to evaluate the fatigue resistance of a mortar sample including the theoretical design of the mortar composition and the actual fatigue test protocol. The findings of this study present an efficient test procedure for the estimation of the fatigue life of bituminous mortars, with a consistent fracture zone, reproducible mortar samples and high coefficient of determination (R2) for the fatigue curves. Reflecting on other fatigue testing approaches, this theoretical and empirical study provides additional value towards standardization of fatigue testing in bituminous mortars.
Book: Proceedings of the RILEM International Symposium on Bituminous Materials : ISBM Lyon 2020
Pages: 1135 - 1141
ISBN:978-3-030-46454-7
Publication year:2021
Keywords:H1 Book chapter
Accessibility:Closed