What does the Proctor Test measure?

What does the Proctor Test measure?

• A. The density of a compacted soil as a function of applied compaction energy.
• B. The moisture content of soil at field moisture condition.
• C. Soil particle size distribution.
• D. Permeability of soil to water.

Answer: (A)

The Proctor test shows how the dry density of soil after compaction changes with the energy used during compaction. By compacting soil in a mold with a defined energy (standard or modified) and at different moisture contents, you obtain a relationship between density and compaction energy that reveals the maximum dry density and the optimum moisture content for achieving that density in the field. This test specifically characterizes how density responds to the amount of compaction work applied, not the soil’s particle-size distribution or its permeability, and it isn’t simply measuring moisture content at field conditions.

The Proctor test shows how the dry density of soil after compaction changes with the energy used during compaction. By compacting soil in a mold with a defined energy (standard or modified) and at different moisture contents, you obtain a relationship between density and compaction energy that reveals the maximum dry density and the optimum moisture content for achieving that density in the field. This test specifically characterizes how density responds to the amount of compaction work applied, not the soil’s particle-size distribution or its permeability, and it isn’t simply measuring moisture content at field conditions.