United States Department of Transportation
i
Evaluation of PCC Pavement and Structure Coring and In Situ Testing Alternatives
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2016-12-01
[PDF-7.95 MB]
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:The objectives of this research are to evaluate core strength correction factors considering a range of pertinent factors that are encountered in the field, and to investigate more practical core field curing practices that provide best estimates of in-place concrete strength. The effect of core condition (including presence of embedded rebar) and core conditioning procedures (dry and wet) on the measured compressive strength of the core sample was considered. AnTech Report objective of the research was to evaluate the utility of practical non-destructive testing (NDT) methods for estimating in-place concrete strength that could be used to reduce the amount of required coring or to provide an estimate of in situ strength for locations that cannot be cored, such as in precast prestressed beams. The results of in-place cylinder and core strength tests were statistically compared. This study shows that using dry-conditioned cores with the correction factors 1.05 for PV/SI cores without rebar, 1.08 for PV/SI cores with rebar, and 1.03 for PS cores without rebar yields the most confident strength estimations. Dry-conditioned core strength data show less variability than the data from wet-conditioned cores. The presence of rebar had minor effect on core strength. Non-destructive testing methods can be used to establish correlation curves to estimate in-place strength; several methods were characterized analyzing their variability and sensitivity. Results from this study can assist the Illinois Department of Transportation (IDOT) in establishing procedures to estimate the in-place strength of concrete with greater accuracy; such information could be used by IDOT to improve implementation of pay-for-performance specifications for Portland cement concrete (PCC) construction.
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