Case Study #2: Measuring Thickness of Concrete Pavement in
New Highway Test Section, Arizona
Problem: Determine thickness of new highway
pavements placed on different sub-bases, including
aggregate, permeable asphalt, and lean concrete.
Results: Independent measurements of wave
speed were used with impact-echo tests to measure
thickness at eight locations.
Outcome: Uncertainties in measured thickness
were 1% for pavement on lean concrete sub-base, 2%
for asphalt sub-base, and 3% for aggregate sub-base.
Results contributed to preparation of new ASTM
Standard, C 1383 98a, entitled, "Standard Test Method for
Measuring the P-Wave Speed and the Thickness of
Concrete Plates Using the Impact-Echo Method",
approved by ASTM in December 1997.
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