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- W655966710 abstract "Integrity testing for concrete placement of many drilled shaft piers has been performed using gamma density measurements. Modern downhole wireline geophysical tools with power winches and portable microcomputer-based control, data collection and presentation provide profound improvements over earlier instruments that had to be positioned, read and recorded at discrete depths. Deployed in PVC or other plastic or metal access tubes cast into the shafts, these modern tools typically provide density measurements at depth intervals of 0.1 feet while moving up-hole at rates of 10 feet per minute. Results of the density measurements can be examined as they are acquired during logging, and hard copy can be produced one a PC-compatible printer is available. Access tubes that have become debonded from adjacent concrete are still effective so that integrity testing can be performed long after concrete placement, if necessary. Access tubes can be air or water filled. Density measurement baselines vary slightly if both air- and water-filled tubes or portions of tubes are present. On occasion, the overall density baseline has been observed to gradually change with depth; interpretation criteria based on statistical variation may need to rake such gradual changes into account. Examples of documented flaws in drilled shafts and corresponding gamma density measurements are presented." @default.
- W655966710 created "2016-06-24" @default.
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- W655966710 date "2002-01-01" @default.
- W655966710 modified "2023-09-27" @default.
- W655966710 title "GAMMA DENSITY LOGGING OF DRILLED SHAFTS-SOME OBSERVATIONS AND INTERPRETATIONS" @default.
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