Civil Engineering Association

Precision Estimates of AASHTO T148: Measuring Length of Drilled Concrete Cores

This report presents the results of a round robin study to prepare precision estimates for AASHTO T148 test method used for determining the length of a core drilled from a concrete pavement or structural element. The materials for the round robin included six concrete cores taken from LTPP test sections of FHWA. The cores were either 4” or 6” in diameter with varying length in the range of 4” to 12”. The cores were representative of different FHWA LTPP concrete pavement test sections from which they were removed. The apparatus for measuring the length of the cores was a 3-point callipering device specified in AASHTO T148 test method. The six specimens were carried around to eleven laboratories and the length measurements were collected. The results indicated that the repeatability and reproducibility precisions are significantly different for different core diameters. Therefore, the precision estimates were prepared separately for 4” and 6” diameter specimens.

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