Comparing the Volumetric and Mechanical Properties of Laboratory and Field Specimens of Asphalt Concrete (2016) / Chapter Skim
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Pages 60-67
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60 C H A P T E R 6 6.1 Specification Recommendations This section presents the development of a draft proposed AASHTO recommended practice that addresses the cause and magnitude of variability within and among the three specimen types (i.e., LL, PL, and PF)
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61 Table 6-1. Single-operator tolerance.
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62 Figures 6-5 through 6-8 compare the tolerances developed from the mixtures in this study with current state tolerance values. The figures show that many states allow deviations between the submitted JMF and values reported during production, which are within the maximum allowable deviations observed in this study.
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63 Conversion factors were developed for each of the 10 mixtures evaluated in this project. Table 6-3 presents the conversion factors developed from the LWT test data.
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64 Table 6-5 presents the results of the conversion factor analysis for IDT dynamic modulus. As shown in this table, no conversion in the modulus data among the specimen types is required in the low-temperature region, nor is a conversion factor required at any temperature between laboratory-compacted specimens.
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65 1000 10000 100000 1000000 10000000 1E-08 0.000001 0.0001 0.01 1 100 10000 D yn am ic M od ul us , P SI Reduced Frequency, Hz Design (LL) Construction (PF)
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66 (a) Low Traffic 0 5 10 15 20 25 30 35 40 45 Alligator Cracking (%)
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67 LTPP General Pavement Study (GPS) sections, which would account for these differences.
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