United States Department of Transportation
i
Unbonded portland cement concrete overlay/pavement monitoring with integrated grating and scattering optical fiber sensors.
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2014-06-01
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[PDF-7.52 MB]
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Abstract:This report summarizes the findings and results from a laboratory and field study on the strain distribution
and crack development in 3” thick concrete panels cast on top of existing concrete pavements as a rapid
rehabilitation strategy for roadways. Both fiber Bragg gratings (FBG) and Brillouin Optical Time Domain
Reflectometry/Analysis (BOTDR/A) were applied and tested for their feasibility and effectiveness in
distributed strain measurement and crack detection. For laboratory tests, six 6’×6” panels were cast
similar to their corresponding field construction. Each was tested under both truck loads and under three-point loads. The performance of distributed BOTDR/A strain measurements was compared with that of
FBG sensors. In field study, the performance of FBG sensors was compared with that from strain gauges
when the ambient temperature was measured with thermocouples. Overall, hairline to major cracks can be
successfully detected with the distributed BOTDA measurements. The strain distributions measured from
the FBG and BOTDR/A sensors are consistent. The FBG readings are in good agreement with those of
strain gauges. Both FBG and BOTDR/A technologies are promising for pavement monitoring.
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