ASTM D2170 standard test method for kinematic viscosity of asphalts (bitumens)
7. Preparation of Sample
7.1 To minimize loss of volatile constituents and to obtain reproducible results, proceed as follows:
7.1.1 Procedure for Liquid Asphalt (Bitumen) and Road Oil:
7.1.1.1 Allow sealed samples, as received, to reach room temperature.
7.1.1.2 Open the sample container and mix the sample thoroughly by stirring for 30 s taking care to avoid the entrapment of air. If the sample is too viscous for such stirring, place the sample in the tightly sealed container in a bath or oven maintained at 145 more or less 5°F (63 more or less 3°C) until it becomes sufficiently liquid for stirring.
7.1.1.3 Immediately charge the viscometer, or, if the test is to be made at a later time, pour approximately 20 mL into one or more clean, dry containers having a capacity of approximately 30 mL and immediately seal with an airtight closure.
7.1.1.4 For materials with kinematic viscosities at 140°F (60°C) above 800 cSt, heat the 20-mL sample in the sealed container in an oven or bath maintained at 145 more or less 5°F (63 more or less 3°C) until it is sufficiently liquid for a convenient transfer into the viscometer. Such heating should not exceed 30 min.
7.1.2 Procedure for Asphalt Cement:
7.1.2.1 Heat the sample with care to prevent local overheating until it has become sufficiently fluid to pour, occasionally stirring the sample to aid heat transfer and to assure uniformity.
7.1.2.2 Transfer a minimum of 20 mL into a suitable container and heat to 275 more or less 10°F (135 more or less 5.5°C), stirring occasionally to prevent local overheating and taking care to avoid the entrapment of air.
