Multi-scale study of the small-strain damping ratio of fiber-sand composites

Haiwen Li, Sathwik S. Kasyap, Kostas Senetakis

Research output: Contribution to journalArticleScientificpeer-review

3 Downloads (Pure)

Abstract

The use of polypropylene fibers as a geosynthetic in infrastructures is a promising ground treatment method with applications in the enhancement of the bearing capacity of foundations, slope rehabilitation, strengthening of backfills, as well as the improvement of the seismic behavior of geo-systems. Despite the large number of studies published in the literature investigating the properties of fiber-reinforced soils, less attention has been given in the evaluation of the dynamic properties of these composites, especially in examining damping characteristics and the influence of fiber inclusion and content. In the present study, the effect of polypropylene fiber inclusion on the small-strain damping ratio of sands with different gradations and various particle shapes was investigated through resonant column (macroscopic) experiments. The macroscopic test results suggested that the damping ratio of the mixtures tended to increase with increasing fiber content. Accordingly, a new expression was proposed which considers the influence of fiber content in the estimation of the small-strain damping of polypropylene fiber-sand mixtures and it can be complementary of damping modeling from small-to-medium strains based on previously developed expressions in the regime of medium strains. Additional insights were attempted to be obtained on the energy dissipation and contribution of fibers of these composite materials by performing grain-scale tests which further supported the macroscopic experimental test results. It was also attempted to interpret, based on the grain-scale tests results, the influence of fiber inclusion in a wide spectrum of properties for fiber-reinforced sands providing some general inferences on the contribution of polypropylene fibers on the constitutive behavior of granular materials.

Original languageEnglish
Article number2476
Number of pages20
JournalPolymers
Volume13
Issue number15
DOIs
Publication statusPublished - 2021

Keywords

  • Damping
  • Energy dissipation
  • Fibers
  • Geosynthetics
  • Ground treatment
  • Resonant column testing

Fingerprint

Dive into the research topics of 'Multi-scale study of the small-strain damping ratio of fiber-sand composites'. Together they form a unique fingerprint.

Cite this