Working along with the Geotechnical Engineer, we are able to assess the proper lime product to apply. Once the product has been selected we have it delivered and pumped into our application equipment pneumatically. Once we have the application rate determined, we use a blending machine blend the soils anywhere from 8”-10” deep. Once the soil has been blended, we allow the lime to chemically react with the dirt which generally alters the composition of the dirt. Depending on the soils, this process could take one to several hours to react. When we feel the chemical has reacted to the soil, we proceed with rolling, compacting the dirt, check moistures, thus allowing us to place the next lift. We have had moisture contents of 35-40% and have been able to achieve a moisture content of 15% within a matter of hours.
Another alternative to wet sub-grade conditions on road sub-grade is the application of Portland powdered cement which is the same process as the lime applications. Soil cementing is an application we use prior to placing the stone. Instead of undercutting and refilling with stone and/or fabric to stabilize the road sub-grades, we find it more cost effective to place soil cement. Dixie adds 70-80 lbs. of cement per square yard of roadway sub-base and blends the cement with the dirt. We add water throughout the process, immediately roll it up, add water as needed, blend dirt and fine grade. We find within 24 hours of what was pumping and yielding the day before will pass any proof roll thus allowing us to place stone and prepare for paving.