Which individual is responsible for adjusting the proportioning of materials in concrete production?

The individual responsible for adjusting the proportioning of materials in concrete production is the contractor's certified concrete technician. This role includes ensuring that the concrete mix meets the required specifications and performance standards. The technician has the specialized training and knowledge necessary to make adjustments based on factors such as the type of aggregates being used, environmental conditions, and the specific requirements for strength and workability of the concrete.

Concrete batchers may be involved in the actual mixing process, while site supervisors and construction managers may oversee the work but generally do not make technical decisions regarding mix proportions. The certified technician’s expertise is essential in optimizing the concrete mix for the project's needs, ensuring quality and compliance with regulatory standards.