Government Contract | Nevada
Non-Destructive Testing of Drilled Shafts

Bid Information

Bid Alert No: 00000494939

Bid Title: Non-Destructive Testing of Drilled Shafts

Agency Bid No. Title: 741-15-020

Received Date: 02/25/2016

Close Date: 03/17/2016

Purchase Type: Not Stated

Delivery Point:

Delivery Date: Not Stated

Special Notices: Questions Due By 03/01/2016


Specifications include, but are not limited to:Cross-Hole Sonic Logging (CSL) is a downhole test method for evaluating the quality of concrete in drilled shaft foundations. PVC or steel access tubes are cast-in-place in the concrete shaft during construction. The CSL test is conducted by sending a sonic pulse wave through the concrete from a sonic emitter in one water-filled tube to a receiver in a second water-filled tube. Using the distance and the measured travel time between the tube pair, the speed of the pulse wave traveling through the concrete can be determined. The speed can then be correlated with quality of concrete. CSL testing is performed by lowering probes into two tubes and the source emits a pulse, while the receiver response and probe depth are simultaneously recorded. Data recorded by the receiver are then processed by a PC-based data logging system. The concrete integrity is evaluated by analyzing the wave travel times and wave velocities. Longer travel times and corresponding slower velocities suggest irregularities in the concrete between the tubes, provided good bonding is present between the tubes and concrete interface. A complete loss of a signal is indicative of a significant defect in the concrete between one or more tube pair combinations. Results showing consistent pulse arrival times and corresponding compression wave velocities that are representative of good quality concrete are desirable. Weak concrete, soil inclusions, and defects such as water or slurry contamination or air voids will result in delayed arrival (slower velocity) or no arrival in the defect zone

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Bid Related Attachments

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Product Codes: 91275, 99200

Agency Information

Issuing Agency: State of Nevada - Department of Transportation

State: Nevada

Agency Type: State and Local

Contact: Agreement Services 1263 South Stewart Street, Room 101A, Carson City, Nevada, 89712

Phone: 775-888-7070

Fax: 775-888-7101




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