On a compaction graph, the zero-air-voids line represents the dry unit weight corresponding to:
Correct answer: C. complete saturation at each water content
- A. constant air content of five percent
- B. maximum dry density at optimum water content
- C. complete saturation at each water content
- D. complete removal of water from the soil
Explanation
The zero-air-voids line is the theoretical limit for a soil with no air in its voids, meaning complete saturation. A normally compacted soil curve remains below this line because some air usually remains trapped.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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