Comparing the Volumetric and Mechanical Properties of Laboratory and Field Specimens of Asphalt Concrete (2016) / Chapter Skim
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28 C H A P T E R 4 4.1 Description of Specimen Preparation Three possible scenarios for production of asphalt mixture specimens were considered in this project: (1) laboratorymixed–laboratory-compacted specimens (LL)
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29 Figure 4-1. Laboratory-mixed–laboratory-compacted (LL)
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30 3. The mixture was put in the oven and brought to compaction temperature (typically in less than 45 minutes)
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31 G Aggregate Oven Dry Weight Aggregate SSD weight Aggregate SubmergedWeight (5) sb water = − γ When the total aggregate consists of separate fractions of coarse aggregate, fine aggregate, and mineral filler, all having different specific gravities, the bulk specific gravity for the aggregate blend is calculated.
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32 as performance targets for low and high traffic, respectively (Kim et al.
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33 evaluated for each specimen type. Additionally, an analysis of covariance (ANCOVA)
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34 Methods for Construction Materials," defines single-operator precision (also known as repeatability) as "an estimate of the difference that may be expected between duplicate measurements made on the same material in the same laboratory by the same operator using the same apparatus within a time span of a few days." On the other hand, multi-laboratory precision (also known as reproducibility)
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35 deviation reported by the corresponding AASHTO standard test method. The standard deviation reported by the AASHTO method is calculated for the entire population from a large number of replicates (e.g., nGmm = 626, nAC = 308, nAV = 654)
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36 predicted performance for four pavement structures. Three structures representing typical pavements used in Louisiana were used for three traffic levels (low, medium, and high)
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37 was used in the analysis. However, values consistent with the Louisiana Pavement Management System (PMS)
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38 on surface elevations in the Gulf Coast regions in the United States (Williams and Williamson 1989)
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