ASTM D545-19 pdf free.Standard Test Methods for Preformed Expansion Joint Fillers for Concrete Construction (Nonextruding and Resilient Types)
1.1 The precision of these test methods are based on an interlaboratory study (ILS) of this standard conducted in 2007.Results in this study were obtained from a total of six laboratories, testing five different joint. fller materials. Every “test result” reported represents an individual determination. Each paricipating laboratory reported up to ten replicate test results for each material. Except for the inability of every participating laboratory to provide test results for all study parameters, Practice E691 was followed for the design and analysis of the data; the details are given in ASTM Research Report No. D04- 1027.3
1.2 Repeatability Limit (r)- -Two test results obtained within one laboratory shall be judged not equivalent if they differ by more than the“r”value for that material;“r”is the interval representing the critical difference between two test results for the same material, obtained by the same operator using the same equipment on the same day in the same laboratory.
1.3 Repeatability limits are listed in Tables 1-7.
1.4 Reproducibility Limit (R)- Two test results shall be judged not equivalent if they differ by more than the“R” value for that material; “R” is the interval representing the critical difference between two test results for the same material, obtained by diferent operators using different equipment in different laboratories.
2 Any judgment in accordance with statements 8.1.1 and 8.1.2 would normally have an approximate 95 % probability of being correct; however, the precision statistics obtained in this ILS must not be treated as exact mathematical quantities which are applicable to all circumstances and uses. The limited number of laboratories reporting results guarantees that there will be times when differences greater than predicted by the ILS results will arise, sometimes with considerably greater or smaller frequency than the 95 % probability limit would imply.The repeatability limit and the reproducibility limit should be considered as general guides, and the associated probability of 95 % as only a rough indicator of what can be expected.