Modified Proctor test uses how many layers?

Modified Proctor test uses how many layers?

• A. 3 layers
• B. 2 layers
• C. 5 layers
• D. 4 layers

Answer: (C)

In compaction testing, the number of lifts (layers) used to compact the soil in the mold reflects the energy distribution applied to the sample. The Modified Proctor uses more energy than the Standard Proctor, so it divides the soil into more lifts to deliver that energy more evenly through the entire depth. Specifically, the Modified Proctor compacting process uses five layers, whereas the Standard Proctor uses three layers. This extra layering helps the higher compaction effort produce a more uniform density profile and a higher maximum dry density appropriate for denser field fills.

In compaction testing, the number of lifts (layers) used to compact the soil in the mold reflects the energy distribution applied to the sample. The Modified Proctor uses more energy than the Standard Proctor, so it divides the soil into more lifts to deliver that energy more evenly through the entire depth. Specifically, the Modified Proctor compacting process uses five layers, whereas the Standard Proctor uses three layers. This extra layering helps the higher compaction effort produce a more uniform density profile and a higher maximum dry density appropriate for denser field fills.