What test procedure is used for obtaining a field gradation sample?

The procedure used for obtaining a field gradation sample is crucial for quality control in aggregate materials, ensuring that the mix design meets specified criteria. The ITP2 procedure specifically outlines the steps to properly gather a representative field sampling of aggregates. It details the necessary equipment, sampling techniques, and the conditions under which the samples should be taken to minimize variations or contamination that could affect the test results.

By following the ITP2 procedure, technicians are able to ensure that the sample collected truly reflects the aggregate's characteristics in the field, as opposed to potentially anomalous lab samples. This is particularly important for determining the gradation of the materials, which impacts the performance and durability of the pavement or structure being constructed.

Other procedures listed are likely meant for different aspects of handling materials or testing, but ITP2 is specifically tailored for field gradation sampling, making it the appropriate choice for this question.