Impulse-Response testing is a nondestructive test method which can be readily used for quality control and integrity assessment of cast-in-place concrete foundation piles. Two case studies are presented demonstrating how Impulse- Response was used to evaluate the installation and quality issues of auger cast-in-place (ACIP) piles and dry-cast concrete piles (i.e., Franki piles). In both case studies, the dynamic properties (e.g., dynamic stiffness and mobility response spectra) determined from testing were correlated to the observed condition of selected piles evaluated through boring, material sampling (i.e., core extraction and petrographic studies), and sub-surface assessment (i.e., excavation and examination). The results indicated that the test method was effective for identifying nonconformities in tested piles of different construction methods much more quickly and efficiently than physical sampling or excavation alone.

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