Aggregates that do not conform to the ASTM standards must be approved by whom?

The approval of aggregates that do not conform to ASTM standards must come from the building official. This requirement exists because the building official plays a crucial role in ensuring that all materials used in construction meet the necessary safety and performance standards. The building official’s responsibilities include enforcing code compliance and approving materials for use in a project. When aggregates deviate from standard specifications, their use could affect the structural integrity and safety of the concrete, making it essential that a qualified authority, such as the building official, reviews and approves those materials.

Other roles, such as the project manager, architect, or contractor, may have significant influence over project decisions and material selections, but they do not have the final authority to approve non-conforming materials from a regulatory standpoint. Therefore, it is the building official who is positioned to safeguard public health and safety by ensuring that all construction materials comply with applicable codes and standards.