[Quality Standards] Improved Soil "Uni-Soil"

At a material age of 24 hours, the cone index is over 800 kN/m²! It corresponds to Type 2 treated soil as indicated in the "Soil Classification Standards."

■ Cone Index (Trafficability) The figure below shows the transition of the cone index over time for the improved soil "Uni-Soil" using sludge by construction method. It can be seen that the cone index for all improved soils "Uni-Soil" exceeds 800 kN/m² at an age of 24 hours, indicating that they correspond to Type 2 treated soil as specified in the "Soil Classification Standards." This suggests that it is a high-quality civil engineering material capable of ensuring sufficient trafficability in a short period. ■ Design CBR Value The expansion ratio of the improved soil (recycled soil) "Uni-Soil" is very small, and it is considered that there is no risk of deformation or destruction of the superstructure and soil structures due to swelling. The CBR value is typically around 60%, which is very high, ensuring that the performance required for subgrade and base materials is adequately met. ■ Example of Leaching Test Results for Improved Soil "Uni-Soil" Cadmium → Below environmental standard value Hexavalent chromium → Below environmental standard value Cyanide compounds → Below environmental standard value Total mercury → Below environmental standard value Selenium → Below environmental standard value Lead → Below environmental standard value Arsenic → Below environmental standard value Fluoride → Below environmental standard value Boron → Below environmental standard value

Ground improvement materialsEarthworksCivil Engineering Method