SHRP-A-379 traducir

4.2 For long-term aging, a compacted mixture of aggregate and asphalt binder is
aged in a forced draft oven for 5 days at 85 °C. The oven aging is designed to simulate the
total aging that the compacted mixture will undergo during 7 to 10 years of service.
5. SIGNIFICANCE AND USE
5.1 The short-term aging practice simulates the aging that asphalt concrete mixtures
undergo during field plant mixing operations. The long-term aging practice simulates the inservice
aging of asphalt concrete mixtures after field placement and compaction.
5.2 The properties and performance of asphalt concrete mixtures may be more
accurately predicted by using aged test samples.
6. APPARATUS
6.1 Aging Test System--A system that consists of a forced draft oven which possesses
the requirements specified in table 1.
Table 1. Minimum Aging Test System Requirements
Range (°C) Resolution (°C) Accuracy (°C)
Temperature 10-260 < 1 5=1
Measurement
Temperature Control 25-250 < 0.1 5=0.1
6.2 Oven--Any oven which is thermostatically controlled and capable of being set to
maintain any desired temperature from room temperature to 160°C. The oven shall be used
for heating aggregates, asphalt binders, or laboratory equipment.
6.3 Mixing Apparatus--Any type of mechanical mixer that: 1) can be maintained at
the required mixing temperatures; 2) will provide a well-coated, homogenous mixture of the
required amount of asphalt concrete in the allowable time; and 3) allows essentially all of the
mixture to be recovered.
6.4 Miscellaneous Apparatus
6.4.1 One metal oven pan for heating aggregates
6.4.2 One shallow metal oven pan for heating uncompacted asphalt concrete mixtures
6.4.3 Thermometers that have a range of 50 to 260°C and conform to the
requirements prescribed in ASTM Document E 1
161