When sampling HMA from a loaded truck, what additional step is required by D 3655?

• A. Selecting an alternative quadrant
• B. Selecting additional random numbers for truck quadrants
• C. Measuring the temperature of the HMA
• D. Determining the weight of the load

Answer: (B)

The correct answer involves selecting additional random numbers for truck quadrants, as stipulated by D 3655. In the context of sampling Hot Mix Asphalt (HMA) from a loaded truck, it is crucial to ensure that the sample represents the entire load accurately. By selecting additional random numbers, inspectors can effectively choose different quadrants within the truck. This method increases the likelihood of obtaining a sample that reflects the overall quality and properties of the HMA, thereby enhancing the reliability of test results.

Sampling from multiple quadrants reduces the risk of bias that may occur if a sample is taken from only one location in the truck. Each quadrant may contain asphalt with varying properties due to factors like segregation during loading and transport. Hence, using random numbers to select quadrants helps in achieving a more representative sample.

Having a systematic approach to sampling is essential for quality assurance and compliance with testing standards, thereby confirming the asphalt mix meets the required specifications before it is used in pavement construction.