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Extra resources for A manual for design of hot mix asphalt with commentary

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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. Gr . = A ( B + W − C ) (4-6) Impermeable voids contain no water Aggregate surface dry Permeable voids filled with water Figure 4-6.

It should be emphasized that the design low pavement temperature is not the same as the minimum air temperature. Typically, the design low pavement temperature is significantly higher than the minimum air temperature for a given location. 6°C, 6 degrees colder than the average design low pavement temperature. Figure 3-9 is a plot of performance grade reliability for design high and low pavement temperatures for Atlanta, GA. 1°C. Calculation of design high and low pavement temperatures at different reliability levels involves compilation of a wide range of weather data and analysis of this data to produce both average values and standard deviations for design high and low pavement temperatures for thousands of sites throughout the United States and Canada.

The only exception is that in Table 4-7 where the minimum FAA value is 45, it can be lowered to 43 if experience with local conditions and materials suggests that this will produce mixtures with adequate rut resistance. Flat and Elongated Particles The percentage of flat and elongated particles in a coarse aggregate is determined using procedures described in ASTM D 4791, Flat Particles, Elongated Particles, or Flat and Elongated Particles. As in the Superpave system, this manual recommends a maximum value of 10% for flat and elongated particles exceeding a 5:1 ratio.

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