SHRP-A-379 traducir

After filling, close all containers tightly, and allow to cool to room temperature. Store at a
temperature of 10°C. Closing the containers prior to cooling will produce a vacuum seal.
4.5 Prior to mixing, set the oven to the mixing temperature as determined in
section 4.3. Place a sufficient number of 1-L cans (with a total weight greater than that
calculated in section 7.8) of asphalt in the oven at least 2 h prior to mixing. Monitor the
temperature of the asphalt periodically. When the temperature approaches the mixing
temperature, transfer the asphalt into a large pot (e.g., an 11-L stock pot) and at the same
time weigh the amount of asphalt added to the pot. Transfer enough asphalt to equal the
amount calculated in section 7.8 plus an extra 80 g (to account for the quantity retained in
the pot after asphalt has been added to the aggregate). Then place the pot in the oven and
continue to monitor the temperature periodically.
NOTE2.--This
twice must be discarded.
constitutes the second heating of the asphalt. Any asphalts that have been heated more than
4.6 Mixing--Preheat the mixer approximately 1 h prior to mixing. Place coarse
aggregate in the mixer, followed by the fine aggregate, and then the asphalt. Mix for
approximately 4 min to ensure uniform coating of the aggregate.
4.7 Short Term Aging--After mixing, remove the mixture from the mixer and place
it in metal pans. Place the mixture in an oven set at a temperature of 135 ° + I°C for
4 h + 1 min. Stir the mixture once an hour.
5. COMPACTION
5.1 Assemble the mold as shown in the schematic illustrated in figure 2. Preheat the
mold with a "tent" equipped with infrared heat lamps (see figure 3).
5.2 Check the oil and fuel levels in the rolling wheel compactor and refill if
necessary. Start the compactor and allow it to warm up. Spray a mild soapy solution on the
rollers.
mold.
5.3 Sparingly apply a light oil (e.g., PAM ® cooking oil) to the base and sides of the
5.4 Remove a pan of mixture from the oven and place it in the center of the mold.
Level the mixture using a rake while at the same time avoiding any segregation of the
mixture (i.e., avoid any tumbling of the coarse aggregate). Repeat this process until the mold
is filled with the required quantity of material to achieve the target air void content. This
should be all of the pre-weighed material. Tamp the mixture to achieve as level a surface as
possible.
5.5 Monitor the temperature of the mixture at the surface, at mid-depth, and at the
bottom in various locations. Allow the mixture to cool until the coolest temperature
corresponds to the pre-established compaction temperature (see notes 3 and 4).
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