SHRP-A-379 traducir

6.4.4 One metal spatula or spoon
6.4.5 Oven gloves
7. HAZARDS
7.1 This test method involves the handling of hot asphalt binder, aggregate, and
asphalt concrete mixtures. These materials can cause severe burns if allowed to contact skin.
Proper precautions must be taken to avoid burns.
8. SAMPLING
8.1 The asphalt binder shall be sampled in accordance with T40.
8.2 The aggregate shall be sampled and tested in accordance with T2 and T27,
respectively.
9. SPECIMEN PREPARATION
9.1 Preheat the aggregate for a minimum of 2 h at the desired mixing temperature.
The amount of aggregate preheated shall be of sufficient size to obtain a mixture specimen of
the desired size.
9.2 Preheat the asphalt binder to the desired mixing temperature. The amount of
asphalt binder preheated shall be of sufficient size to obtain the desired asphalt binder content
to be tested.
NOTE 1.--Asphalt binders held for more than 2 h at the desired mixing temperature should be discarded.
9.3 Mix the heated aggregate and asphalt binder at the desired asphalt content.
10. PROCEDURE
10.1 Place the mixture on the baking pan and spread it to an even thickness of
approximately 21 to 22 kg/m 2. Place the mixture and pan in the forced draft oven for
4 h + 5 min at a temperature of 135°C + 1°C.
10.2 Stir the mixture every hour to maintain uniform aging.
10.3 After 4 h, remove the mixture from the forced draft oven. The aged mixture is
now ready for further conditioning or testing as required. Proceed to section 11 if the
specimens are not conditioned for the effects of long-term aging.
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