What is the range of maximum dry density and optimum moisture content of various soil samples?

What is the range of maximum dry density and optimum moisture content of various soil samples?

1、 Generally speaking, the maximum dry density obtained by heavy compaction test is about 9.9% higher than that obtained by light compaction test, while the optimal water content is about 3.5% lower (absolute value). That is to say, the greater the compaction function is, the smaller the optimal water content is, and the higher the maximum dry density and strength are, After adopting heavy compaction standard, the compactness of soil foundation can be increased by at least 6%, and the strength of soil layer after treatment can be increased by more than 32%
2、 Generally, when light compaction standard is adopted, the optimum moisture content of soil is about 0.65 times of the plastic limit moisture content for cohesive soil and 0.65 times of the liquid limit moisture content for non cohesive soil
1. Sand: the best water content (by weight)%: 12; the maximum density (KN / m3): 1.1.88
2. Sandy loam: the best water content (by weight)%: 15; the maximum density (KN / m3): 1.85 ~ 2.08
3. Silt: the best water content (by weight)%: 16-22; the maximum density (KN / m3): 1.61-1.8
4. For sub silt, the optimum moisture content (by weight)%: 12-20; the maximum density (KN / m3): 1.67-1.95
5. Clay: the best water content (by weight)%: 15-25 and above; the maximum density (KN / m3): 1.58-1.7
Note: when the heavy hammer is used, the maximum compactness will be increased by 10% on average, and the optimum water content will be reduced by 3.5% (absolute value)
The above answers are for reference only