By National Research Council (U.S.). Transportation Research Board.; National Cooperative Highway Research Program.; American Association of State Highway and Transportation Officials.; United States. Federal Highway Administration.; Advanced Asphalt Technol
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Extra info for A manual for design of hot mix asphalt with commentary
The test is performed at various temperatures, depending on the grade of the asphalt: 46, 52, 58, 64, 70, 76, and 82°C are the standard temperatures for high-temperature DSR tests. The first number in a performance grade is the standard high temperature for DSR testing for that binder. For example, one of the most common grades of asphalt binder is PG 64-22; the high-temperature DSR test on this binder would be performed at 64°C. The DSR test measures both modulus and phase angle. Modulus is a measure of stiffness— the higher the value, the stiffer the binder.
The term speciﬁc gravity is often used interchangeably with density, but has a different meaning. Speciﬁc gravity is deﬁned as the ratio of the mass of a material to the mass of an equal volume of water. It can also be deﬁned as the ratio of the density of a material to the density of water. 0 g/cm3 at room temperature, the values of density in units of g/cm3 are equal to specific gravity values. However, these terms should be used carefully. It is especially important to make sure that the units are included when reporting density values.
Other sieve sizes are sometimes used for special purposes or in other aggregate test procedures. A schematic of a simplified sieve analysis is shown in Figure 4-1. An aggregate sample is collected and placed through a stack of sieves. The sieves are usually shaken mechanically, until the aggregate has been separated completely on the various sieves. At the bottom of the sieve stack is a pan, in which material is collected that has completely passed through the stack of sieves. The aggregate on each sieve is then weighed, and calculations are performed to determine the percent passing for each sieve.