Soil testing provides critical information used by civil and geotechnical engineers for design of pavements, structures and embankments. Establishing the characteristics of rock and soil materials has a direct impact on selection of pavement materials, foundation systems and design parameters for the buildings, roads, bridges and other infrastructures in our world.
A geotechnical laboratory soils testing program usually includes sample collection, visual classification and selected test methods to determine if the materials, whether they be soil, clay, sand, gravel or rock, have the potential to perform as needed for the planned construction site. These processes are the first step in establishing the requirements of an engineered design.
Testing equipment from Gilson meets the requirements of accepted ASTM and AASHTO test methods and standards. Typical tests are performed to determine grain size analysis, moisture content, and characteristics at differing moisture contents (Atterberg Limits). Other tests such as triaxial shear, direct shear, unconfined compressive strength, permeability, and compaction density (Proctor) are also frequently run.
- California Bearing Ratio (CBR) equipment is used in the lab to determine relative strength of laboratory-compacted soils, or on-site in the field to confirm performance of in-situ soils. This and similar equipment is also used in the Florida Limerock Bearing Ratio (LBR) method.
- Triaxial Shear Strength equipment helps ensure the safe design and construction of structures and foundations by testing soils for shear strength.
- Unconfined Compressive Strength test equipment meets ASTM and AASHTO standards for determining cohesive soil strength values.
- Direct/Residual Shear Strength testing equipment includes Conbel™ Pneumatic and dead-weight and shear machines to measure resistance of soils to direct and residual shear forces.
- Consolidation with equipment that allows prediction of potential settlement of soils under loads in pavements and structures.
- Permeability equipment and ancillary products identify flow characteristics, or hydraulic conductivity of water and other fluids through a soil.
- Soil Cement equipment measures compressive strength of soil and cement mixtures, often used to increase subgrade strength in pavement designs. Test sets and components are designed for use with Load Frames from Gilson or other manufacturers.
- Proctor Compaction & Soil Density Equipment includes compaction hammers and molds used to determine compacted density and unit weights of soils. Findings from these tests control placement and compaction of soil embankments and other engineered fills.
- Load Frames are available with different strain rates and adaptable for use with many laboratory tests. Manufactured by Karol-Warner.
- Load & Displacement Measurement products include grouped sets and individual components used in a range of soil tests that measure load and displacement with load frames.
- Porous Stones support samples in soil tests including triaxial, consolidation and permeability. They are available in a range of sizes from 1.4 to 6.0in (36 to 152mm), and come in round or square diameters.
- Latex Membranes provide a tight fit on soil specimens, protecting from fluid leaks into the sample while testing. Also come in sizes ranging from 1.4 to 6.0in (36 to 152mm).
- Atterberg Limits products establish moisture contents of cohesive soils that determine liquid, plastic and shrinkage limits.
- Field Testing/Classification products are used in classifying soils by estimation of grain size distribution, shear strength, density and moisture into the proper geotechnical group.
- Hydrometer Analysis of Soils determines particle size distribution of fine-grained soils by measuring suspended solids in sedimentation cylinders over time.
- Soil Sampling profiles soil layers and obtains samples for classification and testing. Products in this line work across a range of soil types.
- Specimen Measurement tools to accurately measure soil samples include an easy-to-use Diameter Measuring Tape graduated in inches or millimeters, and Digital Calipers with 6 or 12in (152 or 305mm) range.