A common target for compaction targets is 95% relative density. What does this imply?

A common target for compaction targets is 95% relative density. What does this imply?

• A. The in-situ density is 95% of the maximum dry density
• B. The maximum dry density is 95% of in-situ
• C. The moisture content is 95%
• D. The soil contains 95% fines

Answer: (A)

Relative density shows how compact the soil is compared with its loosest and densest states. A target of 95% means the in-situ dry density is 95% of the way from the loosest possible packing to the maximum dry density for that soil. In practical terms, the soil is very densely packed, close to its maximum achievable density, though not necessarily equal to it. This interpretation uses the relation Dr = (ρd − ρd,min)/(ρd,max − ρd,min) × 100, so 95% implies ρd = ρd,min + 0.95(ρd,max − ρd,min). Moisture content or fines don’t define relative density; they influence how you reach that density.

Relative density shows how compact the soil is compared with its loosest and densest states. A target of 95% means the in-situ dry density is 95% of the way from the loosest possible packing to the maximum dry density for that soil. In practical terms, the soil is very densely packed, close to its maximum achievable density, though not necessarily equal to it. This interpretation uses the relation Dr = (ρd − ρd,min)/(ρd,max − ρd,min) × 100, so 95% implies ρd = ρd,min + 0.95(ρd,max − ρd,min). Moisture content or fines don’t define relative density; they influence how you reach that density.