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From page 131... ... D-1 Scope of the Study ............................................................. D-1 Specimen Preparation and Testing Plan .......................... Read the entire page →
From page 132... ... D-2 Specimen Preparation and Testing Plan One set of five test specimens for each test was produced by each laboratory from aggregate/binder material provided by UCPRC and a set of five test specimens for each test was prepared by UCPRC. All specimens were prepared from a California crushed granite aggregate source and a California coastal crude based PG 64-16 binder. Read the entire page →
From page 133... ... D-3 from the pre-fabricated specimens were analyzed to determine to what extent sample fabrication affected the precision of the tests. It should be noted that the purpose of the analysis was not to provide final statements of precision of the test methods. Read the entire page →
From page 134... ... D-4 • Decision rule: Reject H0 if p-value < 0.10; accept H0 if p-value ≥ 0.10 For example, if the p-value from the Welch modified twosample t-test for two distributions is equal to 0.07, H0 will be rejected. In other words, distributions of the two test results are not equal. Read the entire page →
From page 135... ... D-5 Figure D-2. Flow number: variability of test results. Read the entire page →
From page 136... ... D-6 Figure D-4. Flow number: relationship with AV content for in-lab fabricated specimens. Read the entire page →
From page 137... ... D-7 Figure D-7. Resilient modulus: variability of test results. Read the entire page →
From page 138... ... D-8 from TTI and NCAT. The results from TTI show some similarity to those from NCAT. Read the entire page →
From page 139... ... D-9 Figure D-12. Dynamic modulus: variability of test results. Read the entire page →
From page 140... ... D-10 Table D-6. Dynamic modulus: p-values from the Welch modified two-sample t-test. Read the entire page →
From page 141... ... D-11 Figure D-14. Dynamic modulus: comparison of repeatability. Read the entire page →
From page 142... ... D-12 Figure D-18. Phase angle: within-laboratory (k) Read the entire page →
From page 143... ... D-13 Table D-7. Phase angle: p-values from the Welch modified two-sample t-test. Read the entire page →
From page 144... ... D-14 Sources of Variability and Bias The reasons behind the differences in TTI, NCAT, and UCPRC results for the flow number, resilient modulus, and, to a lesser degree, E* and the phase angle were analyzed. Read the entire page →
From page 145... ... D-15 load level while noise was high at 75 lb. On the other hand, TTI's test equipment is capable of testing at only 75 lb. Read the entire page →
From page 146... ... D-16 • Friction reducers -- NCAT used Teflon friction reducers for E* testing (which is allowed according to the specification) Read the entire page →
From page 147... ... D-17 • The UCPRC phase angle values for prefabricated specimens were on the limit for the between-laboratory consistency statistic. • Test results from all three laboratories appeared to be different. Read the entire page →

From page 131...

... D-1 Scope of the Study ............................................................. D-1 Specimen Preparation and Testing Plan ..........................