Buy ASTM D R TEST METHOD FOR LOW STRAIN IMPACT INTEGRITY TESTING OF DEEP FOUNDATIONS from SAI. ASTM D compliance statement of PET – Pile echo tester. Standard Test Method for Low-Strain Impact Integrity. Testing of Deep Foundations (ASTM D ), and. Standard Test Method for High-Strain Dynamic.
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Consistent records are the result of uniform impacts on sound concrete, transducer systems that are properly functioning, motion sensors that are? The low strain integrity evaluation should not be used as the sole factor in establishing pile acceptance or rejection. Alternatively, the hammer may have an accelerometer attached and the measured acceleration may wstm converted to force using the hammer mass.
The apparatus shall display the digitized data of the impact event or upon recall by the user of the digitally stored event. This standard may involve hazardous materials, operations, and equipment. NOTE 1—It is generally recommended that all components of the apparatus for obtaining dynamic measurements and the apparatus for recording, reducing, and displaying data be calibrated if any signs of system malfunctions become apparent. A hammer with a very hard plastic tip can induce a short input force pulse without causing local pile damage.
These data assist evaluation of the pile cross-sectional area and asstm, the pile integrity and continuity, as well as consistency of the pile material, although evaluation is approximate. Record the number of impacts for a speci?
ASTM D 5882-16 Compliance Statement
Attach the motion sensor? The time domain record is then evaluated for pile integrity.
This standard does not purport to address all of the safety concerns, if any, associated with its use. This test method is applicable to long structural elements that function in a manner similar to foundation piles, regardless of their method of installation provided that they are receptive to low strain impact testing. Originally published as D — Ensure that the apparatus is capable of displaying the signal from each selected blow for a minimum period of 30 s.
Ensure that the apparatus for recording, reducing, and displaying data is capable of determining the measurement device overload threshold. The apparatus shall include a graphic display of velocity and force optionaland a data storage capability for retrieving records for further analysis.
The low strain impact should be applied to the pile head within a distance of mm from the motion sensor.
ASTM D5882 – 16
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Such further use and interpretation of the data is a matter of engineering judgment and experience. This apparatus may receive the signals after they have been processed by the apparatus for reducing the data.
Use integrity evaluation from low strain tests together with other information, including pile installation procedures and observations, soil information, loading requirements, etc.
ASTM D – 16 – Standard Test Method for Low Strain Impact Integrity Testing of Deep Foundations
If the cause of poor data is not a motion sensor attachment problem but rather is found to be a transducer malfunction, repair or recalibrate it before further use. Analog data acquisition systems are speci? If the pile head is contaminated, remove a sufficient pile section to reach sound concrete. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors.
Note 1 he quality of the result produced by this test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used.
Often, this method gives sufficient information for integrity evaluation. It is generally helpful to consider the soil profile, ast method and site records when evaluating data obtained by this method.
In the time domain analysis PEMbase the pile integrity evaluation on relative increases and decreases of velocity after the initial impact pulse Fig. Active view current version of standard. Alternatively, velocity or displacement transducers may be used to obtain velocity data, provided they are equivalent in performance to the speci?
The hammer may have a force load cell between the tip and hammer body.
Alternately, the pile head force can be measured as well. This test method is applicable to long structural elements that function e a manner similar to any deep foundation units such as driven piles, augeured piles, or drilled shaftsadtm of their method of installation provided that they are receptive to low strain impact testing. Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results.