How many principal material categories must a QA program document address?

A Quality Assurance (QA) program for materials typically needs to address three principal material categories to ensure comprehensive oversight and compliance with standards. These categories often include:

1. Soils – This involves various types of soil used for construction, their classification, properties, and testing standards.

2. Aggregates – Aggregates include materials such as gravel, sand, crushed stone, and other components used in concrete and asphalt mixes, which must meet specific standards for size, grading, and quality.

3. Concrete – Since concrete is a primary material in construction, monitoring its composition, strength, curing processes, and other characteristics is vital for ensuring structural integrity.

By documenting these three categories, the QA program ensures that materials meet specified quality standards, are sourced properly, and are suitable for their intended use, which ultimately contributes to the safety and durability of the construction projects.