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Soil Compaction Testing


by GFA International

Soil Compaction Testing (otherwise known as density tests) are performed in order to determine the soil compaction level. This compaction is a comparison of the laboratory compaction (Proctor) to the field density and recorded as a percentage. In other words, the density is a comparison of the weight of one cubic foot of material in the field as compared to the laboratory, with the laboratory sample compacted at 100% of its capacity. The percentages required are typically 95% to 98% for buildings and 98% to 100% for roadways. The actual percentages required are established by the design professional, Geotechnical Engineer or Building Code. There are several methods of performing the densities, the most common is the nuclear test method. The sand cone method is considered a more accurate method and is sometimes used to provide correlation tests to the nuclear method.

Who or what agency requires it?
Soil compaction testing is required by building code for buildings and Department of Transportation (DOT) manuals for roadways. The engineer or designer of record will require the testing through the specifications.

Who typically is responsible for testing?
Soil compaction is typically required by contract or specifications to be the responsibility of the contractor.

Who does the test?
Soil compaction testings are performed by Professional Engineering Companies specializing in geotechnical work. These companies are licensed by the State of Florida to practice engineering and geology. Additionally qualified firms should be licensed geology businesses and certified to perform soil testings by agencies such as Florida Department of Transportation, Army Corps of Engineers, Construction Material Engineering Council (CMEC) and members of a professional organization such as Association of Soil and Foundation Engineers (ASFE). Tests are performed in accordance with published ASTM standards

If Soil compaction tests are not performed a building could settle and cause cracking or even catastrophic failure. A roadway would crack, rut, and / or pothole.

gfaHow GFA International can help?
GFA International can provide all these services and many more tests and inspections required by codes and specifications.

Check out their profile at ConstructionConnection.com for further information.



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