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H: Multi-Lab Validation Study
Pages 407-434

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From page 408...
... Figures H-1 and H-2 also show that He difference in resilient moduli for calculated versus assumed Poisson's ratios is much smaller for the Lab ~ data than the Lab 2 and Lab 3 data. This trend is probably due to the fact that the Lab ~ operator is much more experienced In the resilient modulus testing of asphalt concrete using the proposed testing system.
From page 409...
... 5.0E+06 ~4.0E+06 cn ~ _ o' ~ ~ 3.0E+06 Cal o 2.06~06 J In 1.0E+06 O.OE+OG 5.0E~6 - .
From page 410...
... 1.0 z 0.8 o cr: ~S 0.6 IL a `, 0.4 u.
From page 411...
... Again suggesting the importance of the operator's experience on obtaining consistent resilient moduli values. Statistical Comparisons.
From page 412...
... 1.5 o 1 a: In he o In o ~0.5 o 1.0 0.8 o <0.6 o He ~0.4 ~L 00.2 0.0 Labs labs Labs 1 _e_ 41 77 TEMPERATURE (F)
From page 413...
... Table H-~. Comparison of Resilient Moduli and Poisson's Ratio for the Different Labs (a)
From page 415...
... The statistical analyses employed in this study were performed using the general techniques described in Chapter 2 for the aggregate base study. Materials and Notation Base Materials.
From page 416...
... The four laboratories included in the study are indicated as Ll, L2, L3 and L4. Lab ~ was used as the reference laboratory since good agreement In resilient moduli values was obtained from axial displacement measurements made using external EVDTs and inside clamp supported EVDTs.
From page 417...
... Figure H4. Companson of Resilient Moduli for Replicate Specimens- Lab do 3S ._ tax ~ 26 o c 30 20 16 10 o LEGEND S L2B1A ~ L2BiB -O- LL - ~ UL B ~' 4'.
From page 418...
... These findings indicate He resilient modulus test results using the same material, lab and test equipment are statistically reproducible following the proposed test procedure. Lab 4 did have some unexplained variation in equipment behavior or test procedure that influenced He test results.
From page 419...
... Note 1: Notation: R2= Correlation Coeffiaent Squared MSE= Mean Square Error p1, p2, p3 Levei of Significance for Constants K1, K2 and K3 H-13
From page 420...
... Table H 5. Indiv~
From page 421...
... Table H-6. Coefficient of Variation Analysis Of MR Results Based on Calculated MR Values -- Three Stress Levels LAB SPECIMEN Model Constants R7 ~K3 2.511 ~ 256 0.818 3.107 ~.317 0.935 Average a cv(%)
From page 422...
... This finding formed the basis for using externally mounted EVDTs in the round-robin study. General Findings The important findings from the multi-laboratory validation study, which in general reinforce the general findings of He overall aggregate base study, can be summarized as follows: Synthetic specimens of known resilient moduli are extremely useful and should be routinely used by any laboratory performing the resilient modulus test.
From page 423...
... ~0.000<0.01 ~Lines L2/L4 | MNC4A r 2.594 -0.573 1.179| 94.22 0.0425| 0.02~0.01 Tsams VMNCdA 1.422 ~.343 1.073 96.10 0.0351 0.04>0.01 Regress. 1 ~ ~0.395>0.01 ~Lines Note 1: Notation: R2 = Correlation Coeffiasnt Squared MSE= Mean Square Error p1, p2, p3 Level of Significance for Constants K1, K2 and K3 = Standard Deviation CV = Coefficient of Variation H-17
From page 424...
... 1 1 _ r.,. ..,~ 1 ~ Lab L4 1 u Rcferencc Lab L1 LL = Lower BS % Confidence Limits 1 1 1 1 1 40 60 80 Bulk Stress, 8, (psI)
From page 425...
... ~ ~ 0 20 40 60 Bulk Stress, 8, (psi) A: tS3 = 3 PSI B: C,3 - S PSI C: O3 = 10 PSI D:~3= Is PSI E: c53 = 20 PSI 80 100 120 Figure H-8.
From page 426...
... For the same operator and test equipment, reproducible resilient moduli for replicate specimens can be obtained using the aggregate base specimen preparation and testing procedures. When axial deformations are measured outside of the biaxial cell, equipment calibration becomes a dominating factor in obtaining reliable resilient modulus results.
From page 427...
... Samples of two air dried North Carolina subgrade soils were supplied to the 3 laboratories in 5 gallon white plastic buckets at the end of summer, 1994. Figure H-9 shows the T-99 compaction curves along with the Atterberg limits for each of these soil samples.
From page 428...
... Each test involved 15 load sequences of 100 cycles at all the combinations of five different deviator stresses and three different confining stresses. Figure H-IOa shows that with the exception of a confining stress equal to 4 psi on specimen 13B confining stress had little influence on the measured resilient moduli for No.
From page 429...
... Table H - 9. Summary of Statistics for Subgrade Soil Testing Lab Specimen K1 K2 K3 R2 s Avg.
From page 430...
... Cohesive Soil Samples used for Subgrade Tests H-24
From page 431...
... Subgrade Soil Test Results for Lab 1 H-25
From page 432...
... Subgrade Soil Test Results for Lab 2 H-26
From page 433...
... Subgrade Soil Test Results for Lab 3 H-27


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