What determines the sample size according to AASHTO?

The nominal maximum size of aggregate is a critical factor that determines the sample size according to AASHTO (American Association of State Highway and Transportation Officials) standards. This measurement signifies the largest size of aggregate particles within a sample, which impacts various aspects of material handling and testing.

When the nominal maximum size is known, it allows inspectors to establish a standardized procedure for sample collection that ensures the representative nature of the sample. This is important because larger aggregates may require more material to adequately represent the characteristics of the lot, ensuring that tests are conducted on a sample that reflects the overall quality and performance of the aggregate material.

In summary, using the nominal maximum size of the aggregate for determining sample size is essential for maintaining consistency and reliability in testing, which ultimately supports the integrity of construction projects.