The recommended sample cans include double friction-top cans, square cans with screw tops, or small mouth cans with screw caps.

• A. False
• B. Not required for routine testing
• C. True
• D. Use only glass containers

Answer: (C)

Maintaining sample integrity during collection and transport is essential in asphalt testing. The recommended cans—double friction-top, square cans with screw tops, and small-mouth cans with screw caps—are chosen because they seal tightly and resist leakage when handling hot asphalt, preventing evaporation and cross-contamination. They’re typically made from durable, compatible materials and are easy to label and transport in the field and lab. The smaller openings help minimize splash and reduce material sticking to lids, helping to preserve a true representative sample. While glass is inert, it’s prone to breakage and isn’t as practical in field conditions, and other containers may not seal as reliably. This is why those types are considered the appropriate choice.