Use of a Biopolymer for Road Pavement Subgrade

Ali Firat Cabalar (), Nurullah Akbulut, Suleyman Demir and Ozgur Yildiz
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Ali Firat Cabalar: Department of Civil Engineering, University of Gaziantep, Gaziantep 27410, Turkey
Nurullah Akbulut: Department of Civil Engineering, Hasan Kalyoncu University, Gaziantep 27410, Turkey
Suleyman Demir: Department of Civil Engineering, Kilis 7 Aralik University, Kilis 79000, Turkey
Ozgur Yildiz: Department of Civil Engineering, Turgut Ozal University, Malatya 44210, Turkey

Sustainability, 2023, vol. 15, issue 10, 1-17

Abstract: This paper presents an extensive series of laboratory works and a prediction model on the design of a road pavement subgrade with Xanthan Gum (XG) biopolymer. The experimental works were carried out using mixtures of conventional aggregate for road pavement construction and XG at the ratios of 0%, 1%, 2%, and 5%, by dry weight. Unconfined compressive strength (UCS) and California bearing ratio (CBR) tests were conducted during the experimental works at the end of the various curing periods (4, 8, 16, and 32 days). An example of an improvement in the UCS values for a specimen with 5% XG addition tested at the end of 4-daycuring yields about a 200% increment by the end of a 32-daycuring. The CBR values of clean aggregates were found to be increased by about 300% by 5% XG addition for all curing periods applied. Furthermore, the energy absorption capacity of the aggregates was observed to be increased significantly by both XG inclusion and curing period. Moreover, scaled conjugate gradient (SCG) training algorithm-based models developed for the prediction of CBR and UCS test results displayed a very high estimation performance with the regression coefficients of R 2 = 0.967 and R 2 = 0.987, respectively. Evidently, XG biopolymer is provably of use as an alternative inclusion in road pavement subgrades constructed with conventional aggregates.

Keywords: biopolymer; aggregate; unconfined compressive strength; California bearing ratio; prediction model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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