United States Department of Transportation
i
Investigating the Use of In-Place Lateral Pull Off Tests To Determine the Compressive Strength of Structural Concrete
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2019-01-01
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By Sun, Charlie
[PDF-2.50 MB]
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Edition:Final Report
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Abstract:The Kentucky Transportation Cabinet’s current practice for determining the compressive strength of structural concrete consists of two methods. Both methods require that samples be delivered to an off-site facility for testing. Accordingly, affected parties on the project site must wait for the delivery of samples to the off-site facility, the performance of tests and analysis of test data, and the return of test results to the project site. Analysis of existing structural concrete requires core samples to be taken from the structural element in question. As a result, sample locations must be patched and repaired. Sampling can also potentially damage an element’s structural integrity. A quick, on-site method that requires minimal repair is needed to determine the compressive strength of concrete. The lateral pull off test, which is conceptually and methodologically similar to the pull off/pull out test, can be used to determine the compressive strength of in-place concrete. It appears to be an accurate, non-destructive, and reliable method. This method also requires minimal patch work at sample locations. Samples are easily obtained and the test results are quickly determined on-site. Two series of tests — a laboratory test on freshly poured concrete slabs and an in-situ test on ready-to-demolish old bridges — were carried out. Both series of tests run the compressive strength cylindrical concrete test and lateral pull off test simultaneously to validate lateral pull off test as an acceptable and dependable method of determining concrete compressive strength. The test procedure and results look very promising based on the project’s objective.
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