Difference between Light compaction and heavy compaction proctor tests
| S.No. | Light Compaction | Heavy Compaction |
| 1. | Also known as Standard Proctor test | Also Known as Modified Proctor test |
| 2. | Number of blows per layer is 25 | Number of blows per layer is 25 |
| 3. | Number of layers is 3 | Number of layers is 5 |
| 4. | Weight of rammer is 2.5 kg | Weight of rammer is 4.5 kg for greater impact |
| 5. | Rammer dropped from a height of 310mm | Rammer dropped from a height of 450 mm |
| 6. | Volume of mold is 1000 cm3 | Volume of mold is 1000 cm3 |
The mould and the amount of dry soil used in this test is same for both tests. Both the tests are laboratory tests and used to determine maximum dry density and optimum moisture content for a given compaction energy for a given soil sample. Specific gravity of the solid soil grains is 2.67 .
