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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Additional info for A manual for design of hot mix asphalt with commentary
Pavement layers that will encounter lower traffic volumes or are within the lower portion of the pavement structure have less stringent requirements. The primary aggregate speciﬁcation properties are designed to evaluate four critical characteristics for aggregates used in HMA mixtures. These four characteristics are coarse aggregate angularity, ﬁne aggregate angularity, coarse aggregate particle shape, and cleanliness. Just as in the Superpave system, requirements for these characteristics are intended to be enforced on the aggregate blend and not on individual stockpiles.
Usually, a volumetric ﬂask is used for performing ﬁne aggregate speciﬁc gravity measurements. The ﬂask is partially ﬁlled with distilled water and then about 500 g of saturated sand is placed in the ﬂask. The ﬂask is rolled and gently shaken to remove all air bubbles and then more water is added until the ﬂask is ﬁlled just to the calibration mark. The ﬂask is weighed, and the contents carefully poured into a metal pan which is then dried in an oven. The bulk speciﬁc gravity of the ﬁne aggregate is then calculated using the following equation: Bulk Sp.
Rutting, raveling, fatigue cracking, skid resistance, and moisture resistance have all been related to aggregate properties. It is essential that engineers and technicians responsible for HMA mix design thoroughly understand aggregate properties, how they relate to HMA pavement performance, and how aggregate properties are speciﬁed and controlled as part of the mix design process. Aggregate Particle Size Distribution Perhaps the most widely speciﬁed aggregate property is particle size distribution.