ASTM D6760-08 PDF

Principle of the Test Method 4. Because S waves are relatively slow, they are of no further interest in this method. Poor quality concrete containing defects for example, soil inclusion, gravel, water, drilling mud, bentonite, voids, con- taminated concrete, or excessive segregation of the constituent particles has a comparatively lower P-wave speed. Usually the transmitter and receiver are maintained at equal elevations as they are moved up or down the access ducts. In some cases and for special processing the probes may be deliberately offset in relative elevation and the use of multiple receivers either in the same access duct or in multiple access ducts can also be allowed.

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Principle of the Test Method 4. Because S waves are relatively slow, they are of no further interest in this method. Poor quality concrete containing defects for example, soil inclusion, gravel, water, drilling mud, bentonite, voids, con- taminated concrete, or excessive segregation of the constituent particles has a comparatively lower P-wave speed.

Usually the transmitter and receiver are maintained at equal elevations as they are moved up or down the access ducts. In some cases and for special processing the probes may be deliberately offset in relative elevation and the use of multiple receivers either in the same access duct or in multiple access ducts can also be allowed. Testing of the concrete in the vicinity of the duct can also be made with both probes installed in a single access duct. The principles and limitations of the test and interpretation of the results are described in the References section.

Special test methods to further investigate anomalies are employed where the probes are not raised together. The References section lists further sources of information about these special test techniques. N OTE 1—The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D are generally considered capable of competent and objective testing and inspection.

Users of this standard are cautioned that compliance with Practice D does not in itself assure reliable results. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.

Apparatus 6. The tubes shall preferably be mild steel for crosshole testing, and are required to be PVC or equivalent for single hole testing. The plastic material must not deform during the high temperatures of concrete curing. If no tubes are installed during construction, boreholes drilled into the pile or structure can be installed after installation.

The internal diameter of the access ducts shall be sufficient to allow the easy passage of the ultrasonic probes over the entire access duct length.

If the access duct diameter FIG. No further reproductions authorized.

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More D Scope 1. This method can also be extended to diaphragm walls, barrettes, dams etc. This method is most applicable when performed in tubes that are installed during construction.

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