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Field validation of constructed sub-grade and pavement. September 21, 2006. John S. Popovics Jeffery Roesler Marshall Thompson David Lange Robert Rodden Yi-Shi Liu Department of Civil & Environmental Engineering. Project Objectives.

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field validation of constructed sub grade and pavement

Field validation of constructed sub-grade and pavement

September 21, 2006

John S. Popovics

Jeffery Roesler

Marshall Thompson

David Lange

Robert Rodden

Yi-Shi Liu

Department of Civil & Environmental Engineering

project objectives
Project Objectives

Obtain response data and non-destructive test (NDT) test

results from a test structure that replicates the nominal design

to be used in the O’Hare modernization program.

  • The output data from the sensors will be used to infer stress and movement of the slab owing to temperature and moisture gradients. Those responses will be used as input for other OMP research projects.
  • The NDT findings will be used to develop new test methods that provide more appropriate and effective performance at the OMP site.
work to date
Work to date
  • Pavement sensing (instrumented concrete slab)
  • NDE tasks

Saw-cut joints

10 inch pcc slab

16 inch dense AC base

NDT applied to determine in place thickness and/or material properties of pavement layers.

Impact-echo and surface wave methods (SASW, MASW)

concrete pavement instrumentation
Concrete pavement instrumentation

Three types of sensors are embedded in the

concrete slab:

  • Relative humidity (RH) and temperature
  • (at a range of depths though the slab)
  • Slab lift-off (at slab corners)
  • Joint opening

On-site battery-powered data logger collects data

slide10

Non-destructive tests (impact-echo)

Expected resonance at 8000 Hz for 10 inch slab

Dis-bonded region

Bonded region

slide11

Impact-echo thickness predictions

Data from bonded regions (hollow points)

Expected value

Data from dis-bonded regions (solid)

Inaccurate thickness predictions where pcc bonded to ac

work to date conclusions
Useful data for field verification of the constructed pavement layer have been collected. The sensor layout was effective. Most sensors functioned adequately, but lift-off sensor design should be improved.

Conventional NDT tests may not work suitably for OMP pavement structure (dense asphalt base)

Work to date Conclusions
future work
Future work

Continue sensing and data collection in trial slab

to monitor longer term environmental effects, and

share data with other OMP projects

  • Pavement sensing
  • NDE tasks

Incorporate sensors (similar layout) in actual O’Hare

slab cast in 2007 (R/W 9L section?)

Modify or develop new NDT methods for estimation of

layer properties and thickness that will work on O’Hare

pavement: modified impact-echo and MASW. Tests

Developed at ATREL, verified at O’Hare

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