Nondestructive Testing of Unknown Subsurface Bridge Foundations - Results of NCHRP Project 21-5

This digest presents the findings of NCHRP Project 21-5, Determination of Unknown Subsurface Bridge Foundations, which evaluates existing and new technologies for use in determining unknown subsurface bridge foundation characteristics. The digest contains information about the feasibility of using nondestructive test (NDT) methods for the determination of unknown depths of bridge foundations. This will be of interest to bridge and other structural engineers; soils, geology, and foundation engineers; and materials and construction engineers. Foundation depth information, in particular, is needed for performing an accurate scour evaluation at each bridge site, along with as much other information on foundation type, geometry, materials, and subsurface conditions as can be obtained.