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Evaluation of acceptance strength tests for concrete pavements.
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2005-06-30
[PDF-1.73 MB]
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Edition:Final report; July 1, 2003-June 30, 2005.
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Abstract:The North Carolina Department of Transportation has used traditionally flexural strength tests for acceptance
testing of Portland cement concrete pavements. This report summarizes a research project implemented to
investigate the feasibility of using other strength tests and nondestructive tests, to accomplish the same objective
of ensuring an adequate modulus of rupture of the slab but avoiding or reducing the need to perform a large
number of flexural strength determinations for acceptance testing. The present work has been laid around using
a nondestructive test (a resonant column) to measure a seismic modulus that is used as a rating tool to evaluate
the repeatability of duplicate specimens before the specimens are strength tested. This has been accomplished
by developing regression lines and confidence and prediction intervals for the correlation of the seismic
modulus to flexural, splitting tension, and compressive strength test. All these test show strong correlation
coefficients and, thus, all have the possibility to be used in the prediction of flexural strength. The report
suggests a new process for acceptance testing based on using a combination of compressive strength and
seismic modulus. The selection of compression testing is based on the perceived know-how of the personnel of
NCDOT throughout the State.
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