Bender element pairs to effectively quantify local stiffness improvement due to geogrid-aggregate interlock

J. H. Kim, B. Feng, E. Tutumluer, Y. H. Byun

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lateral restraint is considered to be a primary mechanism of geogrid base stabilization, and the geogrid-aggregate interlocking establishes the stiffness enhancement around the geogrid. This paper introduces an innovative application of bender elements in an aggregate base as shear wave transducers to quantify local stiffness increase in the vicinity of a geogrid. Several triaxial test specimens of granite aggregate compacted at optimum moisture content were prepared for resilient modulus testing. For the geogrid-stabilized specimens, a triangular aperture punched and drawn geogrid was placed at mid-height of specimen. To measure shear wave velocities across the specimen at different locations above the geogrid, three bender element pairs were installed on the membrane at three different heights above the mid-specimen. Shear wave velocities and axial resilient strains were recorded under the applied stress states. The shear moduli obtained from the geogrid-stabilized specimen were always greater than those obtained from the unstabilized specimen thereby presenting a local stiffness improvement due to geogrid-aggregate interlocking. Further, in the stabilized specimens, the shear moduli obtained near the geogrid were always greater than those obtained far from the geogrid. Therefore, through the successful shear wave velocity measurements and shear modulus estimation, bender element pairs can be effectively used for the quantification of local stiffness improvement due to geogrid-stabilized aggregate.

Original languageEnglish (US)
Title of host publicationAdvances in Materials and Pavement Performance Prediction - Proceedings of the International AM3P Conference, 2018
EditorsEyad Masad, Ilaria Menapace, Amit Bhasin, Tom Scarpas, Anupam Kumar
PublisherCRC Press/Balkema
Pages511-514
Number of pages4
ISBN (Print)9781138313095
StatePublished - Jan 1 2018
EventInternational Conference on Advances in Materials and Pavement Performance Prediction, AM3P 2018 - Doha, Qatar
Duration: Apr 16 2018Apr 18 2018

Publication series

NameAdvances in Materials and Pavement Performance Prediction - Proceedings of the International AM3P Conference, 2018

Conference

ConferenceInternational Conference on Advances in Materials and Pavement Performance Prediction, AM3P 2018
CountryQatar
CityDoha
Period4/16/184/18/18

    Fingerprint

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Kim, J. H., Feng, B., Tutumluer, E., & Byun, Y. H. (2018). Bender element pairs to effectively quantify local stiffness improvement due to geogrid-aggregate interlock. In E. Masad, I. Menapace, A. Bhasin, T. Scarpas, & A. Kumar (Eds.), Advances in Materials and Pavement Performance Prediction - Proceedings of the International AM3P Conference, 2018 (pp. 511-514). (Advances in Materials and Pavement Performance Prediction - Proceedings of the International AM3P Conference, 2018). CRC Press/Balkema.