Abstract
The capability of a test method to estimate slip resistance depends on its validity and reliability, i.e., lack of systematic and random errors in the measurement process. A prototype portable slipmeter was used to study the sensitivity of transitional friction tests for predicting floor slipperiness. The effects of normal load and sliding velocity on the validity and reliability of the test method were assessed in particular. A lower sliding velocity (0.15 m/s) in combination with a higher normal load (200 N) led to optimum validity and reliability. For this optimum set of parameters, the Spearman's rank correlation coefficient with respect to subjective paired comparisons was 0.74 (p < 0.05) in the wet test condition.
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