What is the diameter of the thread formed from the test sample when rolled?

The diameter of the thread formed from the test sample when rolled is established by standardized procedures that govern the construction of the sample for testing. In the context of aggregate base testing, specifically when conducting the rolling process to determine consistency and grading of the sample, the most commonly used diameter measurement for the thread is 3 mm.

This standard is important as it ensures that the test samples are uniform and representative of the material being evaluated. A consistent diameter allows for reliable comparisons between different samples and ensures that the physical properties are accurately assessed. Adhering to this standard aids in the integrity of the test results, as variations in diameter could lead to discrepancies in evaluating the sample's behavior under load or its ability to compact properly.

The other diameter choices do not correspond to the established standard for this specific test, which is why they are not correct in this context. This emphasis on a specific size helps maintain consistency and accuracy in aggregate testing practices.