Evaluating the Accuracy and Use of Drilled Shaft Integrity Testing Methods in Illinois

R27-188In this project, thermal integrity profile (TIP) and crosshole sonic logging (CSL) tests were performed on three test drilled shafts in three locations in Illinois to determine which technology is more effective at identifying installed defects in drilled shafts. TIP testing was found to be more effective than CSL in identifying installed defects outside the rebar cage. Conversely, CSL was found to be better than TIP at identifying installed defects at the bottom of the drilled shaft. A comprehensive cost analysis for TIP and CSL testing was performed using data from historical Illinois projects. The cost analysis showed that the costs of TIP and CSL testing were comparable. The findings of this research resulted in the creation of a decision flowchart that can be used to assist in the selection of nondestructive testing technology for drilled shafts in Illinois. Based on the project results, Illinois Department of Transportation\u2019s TIP and CSL specifications and construction inspector\u2019s checklist were modified to improve use of these tests