What Is Drilled Shaft Integrity Testing?
Drilled shaft integrity testing verifies the concrete's continuity (the defects — the voids, the soil intrusions, the poor concrete) via the non-destructive methods: the CSL (the cross-hole sonic logging — the tubes' ultrasonic), the gamma-gamma (the density — the logging), and the thermal (the TIP — the hydration heat). The testing: the shaft's quality proven before the column's loads. The deep foundation's QA.
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CSL: the standard
The method (the access tubes — the water-filled; the ultrasonic — the travel time and the energy; the defects — the delays), the criteria (the FHWA — the rating; the tomography — the imaging), and the tubes (the installation — the tied to the cage; the number — the diameter's).
Other methods
The gamma-gamma (the density — the single tube; the logging), the TIP (the thermal — the wires; the heat of hydration; the shape — the radius), and the low-strain (the PIT — the surface; the screening).
Program and response
The specification (the percentage — the tested; the critical — the 100%), the timing (the concrete's — the 3-7 days; the heat's), and the anomalies (the coring — the verification; the remediation — the grouting; the rejection — the replacement). The integrity testing is the shaft's — the unseen proven.
The bottom line
Verify drilled shafts with CSL (ultrasonic between access tubes), gamma-gamma, or thermal integrity profiling — specify testing percentage, investigate anomalies by coring, remediate by grouting.
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