A mixture prepared in a laboratory as part of a mix design should be short-term conditioned in accordance with which standard?

• A. R 28
• B. AASHTO T 180
• C. R 30
• D. ASTM D 4253

Answer: (C)

Short-term conditioning is the step that ages laboratory-prepared asphalt mixes to reflect the early aging and handling they would experience in paving, so tests on the mix design are performed on a consistently prepared specimen. The standard that governs this conditioning process for lab-prepared mixes is the one that directly defines how to condition, including the duration and conditions, to simulate that short-term aging. Using this standard ensures consistency and comparability of results across laboratories and aligns with the mix design testing sequence. Other standards pertain to different parts of the process, such as sampling fresh mixes or performing separate test methods, but they do not set the conditioning procedure used in mix design.