Precision Estimates of AASHTO T148: Measuring Length of Drilled Concrete Cores (2010) / Chapter Skim
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4 CHAPTER 3- ROUND ROBIN TEST RESULTS AND ANALYSIS 3.1 Test Data Five sets of length measurements were collected on each of the six concrete cores. Among the 11 laboratories visited, nine laboratories conducted complete sets of measurements on each of the six cores.
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5 In addition to the effect of height, the effect of surface irregularities on variability of length measurements was investigated. As mentioned earlier, LT1119 core with 4" diameter had more top surface irregularities that the rest of the cores.
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6 Table 3-1- Summary of statistics of concrete core length measurements (mm) Sample ID # of Labs D x L *
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7 The results of comparisons in Table 3-2 also show if the effect of surface roughness was significant on within-laboratory variability. As was shown above, although LT1119 with the largest surface irregularity had the largest within-laboratory variability, yet its standard deviation was not significantly different from that of other 4" diameter cores with less surface irregularity.
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8 LT523. Since 4" is at the low end of the apparatus measuring range, the large variability might be due to the shortcoming of the apparatus.
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9 Table 3-4- Precision estimates for measurement of drilled concrete cores based on AASHTO T148 Condition of Test and Test Property Standard Deviation, mm Acceptable Range of Two results, mm Repeatability (Sr) 4" Diameter 0.4 1.0 6" Diameter 0.7 1.9 Reproducibility (SR)
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