In a standard proctor test, what is the mold volume?

• A. 1/40 ft³
• B. 1/30 ft³
• C. 1/20 ft³
• D. 1/10 ft³

Answer: (B)

In a standard Proctor test, the mold volume is defined as 1/30 cubic foot. This test is crucial for determining the optimal moisture content and maximum dry density of soil, which influences construction and compaction strategies in engineering applications. The mold itself is a cylindrical shape with a specific volume that allows for a standard method of calculation, ensuring consistency across tests.

The value of 1/30 ft³ is significant because it aligns with the standardized procedures outlined by testing organizations such as ASTM (American Society for Testing and Materials). This uniformity ensures that results can be reliably compared and applied in various engineering contexts, which is essential for maintaining construction quality and safety.

Understanding the correct mold volume reinforces the importance of using standardized methods for soil testing, as deviations from these standards could lead to inaccuracies in density and moisture content results, affecting overall project outcomes.