Calcium bentonite and sodium bentonite as stabilizers for roads unbound
Barbieri D.M. Lou B. Dyke R.J. Chen H. Zhao P. Memon S.A. Hoff I.
February 2022Elsevier Ltd
Cleaner Engineering and Technology
2022#6
Several technologies are currently available to stabilize the unbound layers of road pavements. The use of these solutions, often manufactured by means of chemical processes, is steadily increasing worldwide. As an alternative natural resource, the use of bentonite represents a valid option when it comes to road stabilization and its application in this context is still relatively unexplored. This study characterises the use of calcium based bentonite and sodium based bentonite to stabilize a typical road base layer. Considering two types of aggregates with different geological origin, the laboratory investigation is performed on dry specimens by means of repeated load triaxial tests, which assess the enhancement in stiffness and resistance to permanent deformation. The findings show that both the investigated types of bentonite are suitable for road stabilization. Even if negligible from a road engineering standpoint, the performance stemming from calcium bentonite was slightly better than the one pertaining to sodium bentonite when it came to the increase in resilient modulus.
Calcium bentonite , Repeated load triaxial test , Road stabilization , Sodium bentonite , Unbound granular materials
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Norwegian University of Science and Technology, Department of Civil and Environmental Engineering, Høgskoleringen 7A, Trøndelag, Trondheim, 7491, Norway
Changan University, School of Highway. Nan Er Huan Road (Mid-section), Xian, 710064, Shaanxi, China
Oslo Metropolitan University, Department of Civil Engineering and Energy Technology, Pilestredet 35, Oslo, 0166, Norway
Xian University of Science and Technology, College of Safety Science and Engineering, Yanta Road 58, Xian, 710054, Shaanxi, China
Nazarbayev University, School of Engineering and Digital Sciences, Civil and Environmental Engineering, Kabanbay Batyr Ave 53, Nur-Sultan, 010000, Kazakhstan
Norwegian University of Science and Technology
Changan University
Oslo Metropolitan University
Xian University of Science and Technology
Nazarbayev University
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