AASHTO R66:16(2020) Standard Practice for Sampling Asphalt Materials.
Note 2—An alternate to completely filling a container with emulsified asphalt is to fill the container until a small amount of space remains. Squeeze the container to cause the contents to fill to the top. Place the cap and securely tighten it. The space remaining will aid in mixing the sample prior to testing.
6.5. Transferring samples from one container to another shall be avoided, if possible.
6.6. Immediately afler filling, sealing, and cleaning, properly identify the sample containers with a suitable marker. Write on the container itself, not on the lid. Labels or tags also may be used for identification if they can be securely fastened to the container in such a manner as to ensure that they will not be lost in transit. Labels or tags shall not be attached to containers by using the lids to secure them. All identification materials shall maintain their integrity at temperatures up to 200°C
6.6.1. Label information shall include at a minimum: material type, source, and sample date.
7. 1. Bulk Storage Tanks Not Equipped with Mechanical Agitaiotv (Liquid Asphalt Materials or
Materials Liquefied by Hc’aling) —Samples shall be obtained by one of the following methods:
7.1.1. Tank Tap Method—Using valves or taps as shown in Figure 2, at the top, middle, and lower locations of the tank, draw a sample from each location after clearing the line by drawing and discarding a minimum of 4 L (1 gal) of the material. In the event that only one valve is available at the lower location, draw a sample after clearing the line by drawing and discarding a minimum of 4 L (1 gal) of the material.
Each delivery vehicle or distributor shall be equipped with a sampling valve similar in design to those shown in Figure 2. It shall be installed at least 305 mm (1 ft) from the shell and clearly labeled as a “Sampling Valve.” Before the sample is taken from the sample valve, the valve shall be thoroughly flushed. A minimum of 4 L (1 gal) shall be drawn through the sample valve and discarded.AASHTO R66 pdf download.