California Residential Inspector Practice Exam

What is the requirement for concrete mixing and delivery?

1. It shall comply with ASTM C 45

2. It shall comply with ASTM C 92

3. It shall comply with ASTM C 94

4. It shall comply with ASTM C 150

The correct answer is: It shall comply with ASTM C 94

The requirement for concrete mixing and delivery is covered under ASTM C 94, which outlines the specifications for ready-mixed concrete. This standard provides guidelines for the materials and methods used in the production and delivery of concrete, ensuring quality control in both the mixing process and when the concrete is transported to the construction site. ASTM C 94 is crucial for addressing the needs of ready-mixed concrete, which accounts for the majority of concrete used in construction today. Compliance ensures that the concrete maintains the required workability and strength once it has been placed. This standard also includes requirements for the delivery process, such as maintaining certain temperatures and times for material usability. In contrast, the other ASTM standards mentioned in the options pertain to different aspects of concrete and materials. For example, ASTM C 45 deals with the testing of concrete admixtures, ASTM C 92 pertains to the standards for concrete pipe, and ASTM C 150 includes specifications for Portland cement. While important, these standards do not specifically address the complete process of concrete mixing and delivery as ASTM C 94 does. Thus, ASTM C 94 is the appropriate choice for this requirement.