TY - JOUR
T1 - Calcium bentonite and sodium bentonite as stabilizers for roads unbound
AU - Barbieri, Diego Maria
AU - Lou, Baowen
AU - Dyke, Robert Jason
AU - Chen, Hao
AU - Zhao, Pengxiang
AU - Memon, Shazim Ali
AU - Hoff, Inge
N1 - Funding Information:
This work was supported by Norwegian Public Roads Administration (VegDim project, grant number 605377 ) and by Research Council of Norway (HERMES project, grant number 299538 ). The support kindly provided by the laboratory assistants Bent Lervik, Jan Erik Molde, Lisbeth Johansen, Frank Stæhli, Tage Westrum, Torill Sørløkk, Jon Runar Drotninghaug and Laurentius Tijhuis is greatly acknowledged. Crushed rock aggregates kindly provided by Franzefoss Pukkverk avd. Vassfjell, Heimdal, Norway. Natural gravel aggregates kindly provided by Forset Grus, Tanem, Norway. Calcium bentonite kindly provided by Dantonit, Odense, Denmark. Sodium bentonite kindly provided by Imerys Metalcasting, Mannheim, Germany. The above information regarding the bentonite trade names and their suppliers are reported for informational purposes. The findings and opinions reported are those of the authors and not necessarily those of the suppliers.
Publisher Copyright:
© 2021 The Author(s)
PY - 2022/2
Y1 - 2022/2
N2 - 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.
AB - 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.
KW - Calcium bentonite
KW - Repeated load triaxial test
KW - Road stabilization
KW - Sodium bentonite
KW - Unbound granular materials
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U2 - 10.1016/j.clet.2021.100372
DO - 10.1016/j.clet.2021.100372
M3 - Article
AN - SCOPUS:85121977477
SN - 2666-7908
VL - 6
JO - Cleaner Engineering and Technology
JF - Cleaner Engineering and Technology
M1 - 100372
ER -