Structural Evaluation of Flexible Pavement Constructed with Steel Slag–Fly Ash–Lime Mix in the Base Layer
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 6
Abstract
The concept of utilizing industrial wastes for road construction can be materialized only by evaluating the field performance of roads constructed with these wastes. The present study encompasses the laboratory investigation of steel slag–fly ash–lime (SFL) mix substantiated by field evaluation of flexible pavement test sections constructed with SFL mix in the base layer. Based on grain size analysis and unconfined compressive strength (UCS) test, 75% steel fly lime mix was chosen as a potential replacement for wet mix macadam (WMM) in the base layer of flexible pavement. The UCS test results were supported by the shear strength parameters and resilient moduli of optimum SFL mix. The superior stiffness characteristics of the SFL mix obtained in laboratory investigation were validated with a detailed structural evaluation of flexible pavement test sections constructed with 150 and 250 mm thick SFL base. Stiffness-based quality control approach was adopted during the construction of test sections through light weight deflectometer (LWD). SFL base layers exhibited higher in situ stiffness when compared to that of WMM. From the structural evaluation of test sections with falling weight deflectometer (FWD), sections with SFL base layer exhibited lower peak deflections than that of conventional WMM. The back-calculated elastic modulus computed from FWD test for SFL base layers was more than five times that of WMM. Furthermore, test sections with SFL base layer showed a service life ratio up to 2.6 and a notable cost saving up to 15% compared to conventional WMM layer.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors would like to thank the Department of Science and Technology, Ministry of Science and Technology, India (Grant No. DST/TSG/WM/2015/521/G) for funding this research. The authors also appreciate the Road and Building Department, Surat, Gujarat, India for the execution of test sections.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 6 • June 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Apr 7, 2020
Accepted: Oct 13, 2020
Published online: Mar 22, 2021
Published in print: Jun 1, 2021
Discussion open until: Aug 22, 2021
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