Flexural fatigue behavior of fly ash geopolymer stabilized-geogrid reinforced RAP bases

Jallu, Maheshbabu and Arulrajah, Arul and Saride, Sireesh and Evans, Robert (2020) Flexural fatigue behavior of fly ash geopolymer stabilized-geogrid reinforced RAP bases. Construction and Building Materials, 254. p. 119263. ISSN 09500618

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Abstract

Flexural fatigue behavior under heavy traffic loading has been identified as a critical distress problem in a flexible pavement that consists of cemented base/subbase layers. The stresses from repetitive traffic loads eventually reduce the tensile stiffness of the cemented base layer leading to fatigue failure. Therefore, this present study focused on evaluating the flexural fatigue behavior of a high percent (60%) Reclaimed Asphalt Pavement (RAP) replaced by Virgin Aggregate (VA) stabilized with alkali-activated fly ash (FA) under stress-controlled mode. Based on the Unconfined Compressive Strength (UCS), and Repeated Load Triaxial (RLT) test results, a potential design mix was proposed and implemented throughout the testing program. Beam specimens reinforced with biaxial and triaxial geogrids were also experimentally examined for comparison, and the fatigue life of the corresponding specimens was shown to improve by 1.66 and 2.54 times, respectively than the control mix. The fracture energy (GD) and the tensile stiffness index (IRT) of the tested specimens were also evaluated from the flexural strength test results. The test findings indicated that the inclusion of geogrid reinforcement adequately improved the flexural strength and fatigue life of the alkali-activated FA treated RAP:VA beam specimens.

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IITH Creators:
IITH CreatorsORCiD
Jallu, MaheshbabuUNSPECIFIED
Saride, SireeshUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Alkali-activated fly ashes; Flexible pavements; Geogrid reinforcement; Reclaimed asphalt pavements; Repeated load triaxial; Tensile stiffness; Tensile stiffness indices; Unconfined compressive strength;Bending strength; Compressive strength; Fly ash; Geosynthetic materials; Reinforcement; Software testing; Stiffness; Traffic surveys
Subjects: Civil Engineering
Divisions: Department of Civil Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 17 Jul 2021 11:49
Last Modified: 17 Jul 2021 11:49
URI: http://raiith.iith.ac.in/id/eprint/8400
Publisher URL: http://doi.org/10.1016/j.conbuildmat.2020.119263
OA policy: https://v2.sherpa.ac.uk/id/publication/13693
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