Variation in T166 test results can be attributed to an individual laboratoryâs inability For 12.5 and 19.0-mm mixtures containing non-absorptive aggregates, most of the Superpave gyratory test specimens can be attributed to the mixing and compactionĤ. For 12.5 and 19.0-mm mixtures containing non-absorptive aggregates, approximatelyĩ0 percent of the variation in T166 bulk density test results for 150-mm diameter, Specific gravity (Gmb) values obtained using T166 (2.469, 2.495, and 2.497) are For 9.5, 12.5, and 19.0-mm mixtures containing non-absorptive aggregates, the bulk Impracticable to attempt to find ways to improve T166.Ģ. The measurement error values are so small that it may be Three percent air voids and 0.5 percent absorption, the T166 measurement of the Gmb Measurement error values are very small (0.0018) indicating that, for specimens with For 9.5, 12.5, and 19.0-mm mixtures containing non-absorptive aggregates, T166 isĪn excellent method for the determining bulk specific gravity (Gmb). The study conclusions and recommendationsĤ.1.1 AASHTO T166, Standard Test Method for Bulk Specific Gravity ofĬompacted Asphalt Mixtures Using Saturated Surface-Dry Specimensġ. Specimen bulk density was determined by test methods Resulted from the specimen fabrication process (T312) and how much is inherent in the The variability of Gmb results from the Phase 1 study to reveal how much of the variability This Phase 2 study, which eliminated the mixing and fabrication process, was compared to ![]() Gyratory specimens compacted using one SGC. The performance of two methods used to determine the bulk density of Superpave ![]() This study, which was a follow up to NCHRP 9-26, Phase 1, was conducted to evaluate Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.ĬHAPTER 4: CONCLUSIONS AND RECOMMENDATIONS ![]() Specific gravity is commonly used in industry as a simple means of obtaining information about the concentration of solutions of various materials, or of quality control for polymer materials: to evaluate physical changes, or determine the degree of uniformity between samples or lots.Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. In British beer brewing, the practice for specific gravity as specified above is to multiply it by 1000. ![]() Temperatures for both sample and reference vary from industry to industry. Pressure is nearly always 1 atm (101.325 kPa). Nonetheless, the temperature and pressure must be specified for both the sample and the reference. The reference substance is nearly always water at its densest (4☌) for liquids for gases it is air at room temperature (21☌). Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. Specific gravity is the ratio of the density of a substance to the density of a reference substance equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
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