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ASTM D 6760 Document Information:
Title
Standard Test Method for Integrity Testing of Concrete Deep Foundations by Ultrasonic Crosshole Testing
ASTM International
Publication Date:
Jan 1, 2008
Scope:
This test method covers procedures for checking the homogeneity
and integrity of concrete in deep foundation such as bored piles,
drilled shafts, concrete piles or augercast piles. This method can
also be extended to diaphragm walls, barrettes, dams etc. In this
test method, all the above will be designated "deep foundation
elements." The test measures the propagation time and relative
energy of an ultrasonic pulse between parallel access ducts
(crosshole) or in a single tube (single hole) installed in the deep
foundation element. This method is most applicable when performed
in tubes that are installed during construction.
Similar techniques with different excitation sources exist, but
these techniques are outside the scope of this test method.
All observed and calculated values shall conform to the
guidelines for significant digits and rounding established in
Practice D 6026.
The method used to specify how data are collected, calculated,
or recorded in this standard is not directly related to the
accuracy to which data can be applied in design or other uses, or
both. How one applies the results obtained using this standard is
beyond its scope.
The method used to specify how data are collected, calculated,
or recorded in this test method is not directly related to the
accuracy to which data can be applied in design or other uses, or
both. How one applies the results obtained using this standard is
beyond its scope.
This standard provides minimum requirements for crosshole (or
single hole) testing of concrete deep foundation elements. Plans,
specifications, provisions, or combinations thereof prepared by a
qualified engineer, and approved by the agency requiring the
test(s), may provide additional requirements and procedures as
needed to satisfy the objectives of a particular test program.
The text of this standard references notes and footnotes which
provide explanatory material. These notes and footnotes (excluding
those in tables and figures) shall not be considered as
requirements of the standard.
The values stated in SI units are to be regarded as standard. No
other units of measurement are included in this standard.
Limitations—Proper installation of the access ducts is
essential for effective testing and interpretation. The method does
not give the exact type of defect (for example, inclusion,
honeycombing, lack of cement particles, etc.) but rather only that
a defect exists. The method is limited primarily to testing the
concrete between the access ducts and thus gives little information
about the concrete outside the reinforcement cage to which the
access ducts are attached when the tubes are attached to the inside
of the reinforcement cage.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- barrette
- bored pile
- crosshole sonic logging
- crosshole testing
- drilled shaft
- integrity test
- single hole ultrasonic testing
- ultrasonic logging
- ultrasonic testing
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