AASHTO requires double friction-top cans, square cans with screw tops, or small mouth cans with screw caps to hold the asphalt samples.

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Multiple Choice

AASHTO requires double friction-top cans, square cans with screw tops, or small mouth cans with screw caps to hold the asphalt samples.

Controlling how the asphalt sample is contained during testing is essential. When heating or exposing the sample to solvents, you don’t want material to escape or vapors to skew the results, and you need a container that can stand up to the chemical mix and the test conditions. That’s why AASHTO specifies closed cans with reliable seals: double friction-top cans, square cans with screw tops, or small mouth cans with screw caps. These designs provide a tight, leak-resistant seal and good chemical compatibility, so the sample stays intact and the test results stay reproducible. The extra seal of a double friction-top helps prevent lids from loosening during handling, a square can gives stable orientation and consistent volume, and a small-mouth cap minimizes evaporation. Glass jars aren’t guaranteed to meet those needs because they can crack under heat, may not seal as reliably, and can react with solvents, which is why the standard doesn’t require using only glass jars.

Controlling how the asphalt sample is contained during testing is essential. When heating or exposing the sample to solvents, you don’t want material to escape or vapors to skew the results, and you need a container that can stand up to the chemical mix and the test conditions. That’s why AASHTO specifies closed cans with reliable seals: double friction-top cans, square cans with screw tops, or small mouth cans with screw caps. These designs provide a tight, leak-resistant seal and good chemical compatibility, so the sample stays intact and the test results stay reproducible. The extra seal of a double friction-top helps prevent lids from loosening during handling, a square can gives stable orientation and consistent volume, and a small-mouth cap minimizes evaporation. Glass jars aren’t guaranteed to meet those needs because they can crack under heat, may not seal as reliably, and can react with solvents, which is why the standard doesn’t require using only glass jars.

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