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Journal of Zhejiang University SCIENCE A 2010 Vol.11 No.4 P.294-304


An examination of the mechanical interaction of drilling slurries at the soil-concrete contact

Author(s):  Ressol R. Shakir, Jun-gao Zhu

Affiliation(s):  Key Laboratory of MOE for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China, Geotechnical Research Institute, Hohai University, Nanjing 210098, China

Corresponding email(s):   rrshakir@yahoo.com

Key Words:  Drilled shaft foundation, Drilling slurry, Polymer, Bentonite, Simple shear test, Concrete surface, Soil structure interaction, Mudcake

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Ressol R. Shakir, Jun-gao Zhu. An examination of the mechanical interaction of drilling slurries at the soil-concrete contact[J]. Journal of Zhejiang University Science A, 2010, 11(4): 294-304.

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Evidence gained from previous field tests conducted on drilled shaft foundation shows that using drilling slurries to stabilize a borehole during the construction may influence the interfacial shear strength. This paper deals with an exhaustive study of the effects of drilling slurries at the contact between soil and concrete. This study involved adapting a simple shear apparatus and performing approximately 100 experimental tests on the interaction between two types of soils; clay and sandy clay and five specimens of concrete with different surface shapes. It also involved using bentonite and polymer slurries as an interface layer between soil and concrete. Results showed that an interface layer of bentonite slurry between clay and concrete decreases the interfacial shear strength by 23% and as an interface layer between sandy clay and concrete, bentonite increases interfacial shear strength by 10%. Using polymer slurry as an interface layer between clay and concrete decreases the interfacial shear strength by 17% while using it as an interface layer between sandy clay and concrete increases the interfacial shear strength by 10%. Furthermore, the data show that using bentonite and polymer slurry as an interface layer between clay and concrete decreases the sliding ratio by 50% to 60%, while increasing the sliding ratio by 44% to 56% when these are used as an interface layer between sandy clay and concrete.

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