Office Hours: 7:30 a.m. - 4:30 p.m. CST
Phone: (615) 350-4181
Fax: (615) 350-4293
The primary duties of the Soil Laboratory are to test soil and soil-related materials that are retrieved from proposed, active or completed state highway construction sites. The data is given to the Geotechnical Section and used for bearing capacity calculations (for structure foundation design and pavement design), slope stability determinations (for compaction and soil improvements), settlement calculations, and a variety of other purposes as requested and reported in the Subsurface Investigation Report. Bulk Sampling, Split-Spoon Sampling, or Thin-Walled Tube Sampling from various personnel throughout TDOT, primarily in the Geotechnical Section, submits the material. As indicated on the laboratory assignment sheet by the geologist or geotechnical engineer, the soil is tested for classification and physical properties (strength) according to design needs. The Soil Laboratory applies the AASHTO method for sampling and testing soils.
The most common tests performed include: