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By: Mike Muchard, P.E. Applied Foundation Testing, Inc.

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By: Mike Muchard, P.E. Applied Foundation Testing, Inc.

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    1. By: Mike Muchard, P.E. Applied Foundation Testing, Inc.

    2. Drilled Shaft Quality Assurance Test Methods Before Good Construction / Inspection Practice After Crosshole Sonic Logging (CSL) Singlehole Sonic Logging (SSL) Crosshole Tomography Sonic Echo (SE) Gamma-Gamma

    3. QA Methods During Construction

    4. Drilled Shaft Quality Assurance Most Common Construction Wet Method Temp Casing Method Slurry Management Mineral Attapulgite and Bentonite Slurry Testing Density, Viscosity, PH, Sand Bottom Cleanliness Tremie On bottom No Breach 12 hour Time lime open excavation Concrete slump min 4 - 7 to 9 Best

    5. Shaft Inspection Device (SID)

    6. Passing Criteria

    7. Calibrate Feel of Weighted Tape

    8. Use Submersible Pump and Flat Bottom Cleanout Bucket To Get Better Cleanliness

    10. Post Construction Methods

    11. Crosshole Sonic Logging (CSL) And Derivatives

    13. CSL Tubes

    14. CSL Tube Prep Steel Tubes Preferred over PVC for CSL PVC De-bonds Quicker Tubes Mounted on Inside of Cage Typically 1 Tube per Foot of Diameter Tubes Capped at Top and Bottom Filled With Water Before Pouring Concrete

    15. Good CSL Result

    16. Concrete Velocity Based Criteria

    17. Crosshole Sonic Logging Case History

    19. Crosshole Sonic Logging Case History Remediation Required

    20. Soft Toe CSL Remedial Grouting Shaft Toe

    21. Crosshole Sonic Logging Case History PVC Tube De-Bonding - 2 day, 4 day and 11 day Tests

    22. CSL Limitations Can Only Evaluate Inside of Cage Dependent on Bonding Condition of Tubes Dependent on Engineering Interpretation

    23. Gamma- Gamma Logging

    25. Good Result

    26. Shows Enlarged Bulge Near Toe (Still Good)

    27. Pulse Echo Limitations Can Be Inconclusive. Unable to Detect Flaws Smaller Than ~25% of Cross Section Not Able to Detect Soft Bottom Heavily Dependent on Test Operator

    28. Good Construction Practice is Solution Thank You

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