When should a Materials Engineer start sampling and testing aggregates?

A Materials Engineer should start sampling and testing aggregates once the source is identified because this timing allows for the evaluation of the material's properties, ensuring it meets project specifications before it is used in construction. Early testing is crucial to confirm that the aggregates possess the necessary characteristics—such as cleanliness, size distribution, and material composition—required for durable and effective construction.

Identifying the source of aggregates is essential because the quality of construction materials can vary significantly based on their origin. Once the source is confirmed, systematic sampling and testing can begin, which will inform decisions regarding suitability and any need for processing or treatment of the materials involved. This proactive approach helps avoid potential complications and delays later in the project when aggregates are already on-site or incorporated into the work.

This stage is favored over starting sampling after the project begins or during site preparation, as any issues discovered at those points could result in rework or significant project delays. Sampling before any construction begins would be premature, as it is not possible to determine the relevant aggregates without knowing their source first.