International Journal of Digital Earth The International Journal of Digital Earth, jointly published by Taylor & Francis Group, is the official academic publication of the International Society for Digital Earth.
The soil texture triangle is one of the tools that soil scientists use to visualize and understand the meaning of soil texture names. The textural triangle is a diagram which shows how each of these 12 textures is classified based on the percent of sand, silt, and clay in each. Note: these percentages are based on the USDA definition of sand and silt only. Follow these steps to determine the textural class name of your soil sample: 1) Determine the percent sand of your sample and find that number on the bottom of the triangle. Note that the numbers read from right to left, not left to right.
Page 2 of 3. Generally a contractor is given a percentage of optimum compaction that must be. attained in the field. This is referred to as the Relative Density or R(%). Relative densities generally range from 90% -95% as compared to the modified proctor. and 95% - 100% as compared to the standard proctor. Generally granular fills are. required to be compacted to 95% - 100% in the field. Example 1A: An earth fill project utilizes soil backfill soil classified as a silty-sand.