University of Illinois Urbana-Champaign

Acoustoelastic effects of surface waves in concrete subjected to compressive and bending stresses

Spalvier Blanco, Agustin

Content Files
SPALVIERBLANCO-THESIS-2015.pdf

Permalink

https://hdl.handle.net/2142/88118

Description

Title
Acoustoelastic effects of surface waves in concrete subjected to compressive and bending stresses
Author(s)
Spalvier Blanco, Agustin
Issue Date
2015-07-23
Director of Research (if dissertation) or Advisor (if thesis)
Popovics, John S.
Department of Study
Civil & Environmental Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2015-09-29T20:38:54Z
Keyword(s)
  • Concrete
  • Acoustoelasticity
  • Non-destructive testing (NDT)
  • Bending
  • Uniaxial Compression
  • Surface waves
  • Rayleigh waves
  • Ultrasound
  • Wave detection
Abstract
This investigation focuses on the study of acoustoelastic effects on Rayleigh surface waves (R-waves) in concrete samples subjected to 4-point load bending and uniaxial compression, considering a broad range of strain levels. The main objectives are (1) to study individually the acoustoelastic effects in tension and compression, through bending, and (2) to study the acoustoelastic effects of uniaxial compression against compression by bending. Theories of wave propagation and acoustoelasticity are presented heuristically. The most recent findings of acoustoelasticity in concrete are reviewed and discussed. Experiments consist of R-waves generated using a partially air-coupled configuration. Several wave arrival detection methods are studied and results are compared to signals simulated using a finite element model. An optimal R-wave detection method is defined for the investigation's experimental work. Preliminary acoustoelastic results are shown, where measurements are carried out simultaneously on two sides of each of four concrete specimens. These samples are tested under uniaxial compression and then in bending. Some results obtained are similar to other reported research. Acoustoelastic behaviors of opposing surfaces of same specimens are not found to be necessarily the same. Results in general are not repeatable, but two general trends are observed in the tests: (1) at equal strain levels, R-wave velocity decreases more under tension than it increases under compression, and (2) R-wave increases more in uniaxial compression than it increases in compression by bending at a given strain level.
Graduation Semester
2015-8
Type of Resource
text
Permalink
http://hdl.handle.net/2142/88118
Copyright and License Information
Copyright 2015 Agustin Spalvier Blanco

Owning Collections

Graduate Dissertations and Theses at Illinois PRIMARY
Graduate Theses and Dissertations at Illinois
Dissertations and Theses - Civil and Environmental Engineering