Who is responsible for performing gradation tests each day at the plant?

The responsibility for performing gradation tests each day at the plant typically falls to the contractor. This reflects the contractor's obligation to ensure that all materials produced meet the specified quality standards and project requirements. By conducting these tests daily, the contractor can monitor the performance of aggregates, maintain quality control, and take corrective actions when necessary, which is crucial for the overall success of the project.

While the quality control inspector plays a vital role in overseeing the testing processes and ensuring compliance with standards, the primary responsibility for executing the gradation tests rests with the contractor. The plant manager focuses on overall operations and management, while laborers are typically involved in the actual mixing and handling of materials rather than the testing procedures.