Calcium bentonite and sodium bentonite as stabilizers for roads unbound

Diego Maria Barbieri, Baowen Lou, Robert Jason Dyke, Hao Chen, Pengxiang Zhao, Shazim Ali Memon, Inge Hoff

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


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.

Original languageEnglish
Article number100372
JournalCleaner Engineering and Technology
Publication statusPublished - Feb 2022


  • Calcium bentonite
  • Repeated load triaxial test
  • Road stabilization
  • Sodium bentonite
  • Unbound granular materials

ASJC Scopus subject areas

  • Environmental Engineering
  • Engineering (miscellaneous)


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