Standard Penetration Tests for Soil Density

A standard penetration test measures the resistance of the soil to core penetration. Use a 140-lb. hammer to drive a core sampler 30 inches into the ground; the number of blows needed determines the standard penetration number.

Keywords: standard penetration test, standard penetration number, soil density, soil resistance

About this Author

Melody Lee worked as a newspaper reporter, copywriter and editor for 5 years. In addition, she has edited magazine articles and books. Lee holds a degree in landscape design and is a Florida master gardener. She has more than 25 years of gardening experience, which includes working at nurseries and greenhouses.