AASHTO recommends drawing off at least 1 liter before sampling asphalt.

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Multiple Choice

AASHTO recommends drawing off at least 1 liter before sampling asphalt.

Explanation:
Drawing off a fixed volume before sampling is not a universal requirement in AASHTO asphalt sampling. The emphasis is on obtaining a representative sample from the bulk, usually by thorough mixing and then withdrawing a portion that reflects the whole lot as directed by the specific test method. Stating that you must discard at least one liter can bias the sample by removing material that may differ in composition from the bulk, so it isn’t a standard practice. Always follow the exact sampling procedure in the method being used, which will specify how much to take and whether any portion should be discarded.

Drawing off a fixed volume before sampling is not a universal requirement in AASHTO asphalt sampling. The emphasis is on obtaining a representative sample from the bulk, usually by thorough mixing and then withdrawing a portion that reflects the whole lot as directed by the specific test method. Stating that you must discard at least one liter can bias the sample by removing material that may differ in composition from the bulk, so it isn’t a standard practice. Always follow the exact sampling procedure in the method being used, which will specify how much to take and whether any portion should be discarded.

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