Asphalt Plant Technician Practice Test

Long-term conditioning requires placement in a forced draft oven at 85 ± 3 °C for 120 ± 0.5 hours.

85 ± 3 °C for 120 ± 0.5 hours 90 ± 2 °C for 120 ± 0.5 hours 80 ± 3 °C for 96 hours 85 ± 3 °C for 60 hours

Correct Answer:

85 ± 3 °C for 120 ± 0.5 hours

Explanation:

Long-term conditioning is about aging asphalt samples under strictly controlled heat and airflow so the aging process is consistent from one test to another. The standard condition uses a forced-dan oven set to 85 ± 3 °C for 120 ± 0.5 hours. This means the temperature must be kept between 82 and 88 °C and the samples must stay in the oven for between 119.5 and 120.5 hours. Any option that uses a temperature outside 82–88 °C or a SAMPLEduration outside 119.5–120.5 hours would not meet the required conditioning standard, so it would produce different aging results. Therefore, the choice that specifies 85 ± 3 °C for 120 ± 0.5 hours is the correct one.

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