Question: what is the difference between standard and modified proctor tests?
Answer: Standard proctor test - whole soil sample is compacted in 3 layers with 25 evenly distributed blows on each layer with 2.5 kg rammmer and free fall of 300 mm. In Modified proctor test- whole soil sample is compacted in 5 layers with 25 evenly distributed blows on each layer from 4.6 kg rammer with free fall of 450 mm.