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NOTE2.--Platinum RTDs meeting DIN Standard 43760 (Class A) or equal are recommended for this<br />
purpose. The RTD shall be calibrated as an integral unit with its respective meter or electronic circuitry.<br />
6.1.2.3 Reference Temperature Sensing Device--A thermistor, RTD, or<br />
thermocouple as described in sections 9.1.1.2.1, 9.1.1.2.2, or 9.1.1.2.3 shall be used.<br />
6.1.3 Loading device--The loading device shall apply a sinusoidal oscillatory load to<br />
the specimen at a frequency of 10.0 + 0.1 rad/s. If frequencies other than 10 rad/s are used,<br />
the frequency shall be accurate to 1%. The loading device shall be capable of providing<br />
either a stress-controlled or strain-controlled load. If the load is strain controlled, the loading<br />
device shall apply a cyclic torque sufficient to cause an angular rotational strain accurate to<br />
within 100 #rad of the strain specified. If the load is stress controlled, the loading device<br />
shall apply a cyclic torque accurate to within 10 mN.m of the torque specified. Total system<br />
compliance at 100 N.m torque shall be < 2 mrad/N.m.<br />
6.1.4 Control and Data Acquisition System--The control and data acquisition system<br />
shall provide a record of temperature, frequency, deflection angle and torque. Devices used<br />
to measure these quantities shall meet the accuracy requirements specified in table 1. In<br />
addition, the system shall calculate and record the shear stress, shear strain, complex shear<br />
modulus (G*) and phase angle (iS).The system shall measure and record G*, in the range of<br />
100 Pa to 10 MPa, to an accuracy of 0.5% or less. The system shall measure and record the<br />
phase angle, in the range from 0 to 90 °, + 0.1 °<br />
Table 1. Control and Data Acquisition<br />
System Requirements<br />
Quantity<br />
Accuracy<br />
Temperature 0.1 °C<br />
Frequency 1%<br />
Torque<br />
Deflection angle<br />
10 mN.m<br />
100 #rad<br />
6.2 Specimen Mold (Optional)--A silicone rubber mold for forming asphalt binder<br />
test specimens having a diameter approximately equal to the diameter of the upper test plate<br />
and a height approximately equal to 1.5 times the width of the test gap.<br />
wide.<br />
6.3 Specimen Trimmer--A specimen trimmer with a straight edge at least 4 mm<br />
6.4 Calibrated Temperature Detector--A calibrated thermocouple, thermistor, or<br />
RTD with a thickness or diameter < 2.0 mm is suitable for measuring the temperature of a<br />
dummy specimen or sample of asphalt binder. Thermocouples and thermistors are not<br />
reliable to -1-0.1 °C unless calibrated to a standard traceable to the National Institute of<br />
Standards and Technology (NIST) and must be calibrated with associated meters or electronic<br />
circuitry. Platinum RTDs are typically not suitable because they are too large to fit in the gap<br />
between the test plates in the DSR.<br />
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