Structures.

Details

• Creators:
  Sharp, Stephen R. ; Ozyildirim, H. Celik
• Corporate Creators:
  Virginia Center for Transportation Innovation and Research
• Corporate Contributors:
  Virginia. Dept. of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Analysis Of Surface Waves, Sonic Echo, Impulse Response, Ultrasonic Concrete, Impact Echo, Mechanical Waves, NDE, Spectral Nondestructive Tests Reinforced Concrete Pavements Ultrasonic Waves
• Publication/ Report Number:
  FHWA/VCTIR 14-R8
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Corporate Publisher:
  Virginia. Dept. of Transportation
• Abstract:
  "This study evaluated various techniques that use mechanical waves for the evaluation of critical concrete properties,
  
  such as proper consolidation of the concrete during placement and strength development; changes in modulus; and the detection
  
  of cracks, voids, and delaminated regions. The methods evaluated were ultrasonic shear-wave tomography, ultrasonic pulse
  
  velocity, crosshole sonic logging, sonic echo-impulse response, spectral analysis of surface waves, and the use of an impact echo
  
  scanner on pavements and bridge structures.
  
  Ultrasonic shear-wave tomography can be successfully used to determine the major distressed areas in pavements.
  
  Crosshole sonic logging can detect voids in drilled shafts and can indicate concrete performance and quality. Sonic echo-impulse
  
  response can reliably detect voids but is not always able to establish a precise location because of the potential variability in wave
  
  velocity. However, it can still provide useful thickness or depth information. In addition, detection of distress is limited by the
  
  embedded length-to-diameter ratios of the foundation element being examined. The use of ultrasonic pulse velocity can improve
  
  the accuracy of sonic echo–impulse response measurements by providing the actual velocity of the concrete being evaluated. Use
  
  of the impact echo scanner can provide delamination data for structures with smooth surfaces.
  
  In addition to detecting the condition of the concrete elements, these methods can be used to help determine compliance
  
  with end-result specifications. Quality control and acceptance using end-result specifications requires at least three test results to
  
  determine variability, which can be easily obtained using nondestructive test methods.
  
  The results regarding spectral analysis of surface waves were promising, but additional validation work is required to
  
  determine the abilities of this technique to assess asphalt-overlaid concrete decks.
  
  This study showed that nondestructive mechanical wave methods can be successfully used in determining concrete
  
  quality and the extent of distress in concrete structures. The study recommended that these methods be used by the Virginia
  
  Department of Transportation for condition assessment. The next step is to continue collecting data on pavements and bridge
  
  structures using these techniques."
  
  
• Format:
  PDF
• Funding:
  99207
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:9900b7f7bba798683830ee7015e0e97e9d2bf72e87c02c23fc198f76d6ff9308
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27469/dot_27469_DS1.pdf
• File Type:
  [PDF - 5.28 MB ]