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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These limitations must be understood and taken into FIG. Historical Version s – view previous versions of standard. The results of the analysis may include a quantitative assessment of pile integrity.
How one applies the results obtained using this standard is beyond its scope. A hammer with a very hard plastic tip can induce a short input force pulse without causing local pile damage. The apparatus shall balance the velocity signal to zero between impact events.
This test method will not give information regarding the pile bearing capacity. This test method is applicable to long structural elements that function in a manner similar to any deep foundation units such as driven piles, augeured piles, or drilled shaftsregardless of their method of installation provided that they are receptive to low strain impact testing.
Adjust the apparatus to reproduce a signal having a range of duration between 2 ms and 30 ms. When digitizing, the sample frequency, therefore, shall be at least 30 Hz each for the motion sensor and the optional instrumented hammer, if used. Set up the apparatus for recording, reducing, and displaying data so that it is operational and the force and velocity signals are zeroed.
These notes and footnotes excluding those in tables and figures shall not be considered as requirements of the standard. Some cases involving integral superstructures, may require use of two motion measuring devices attached at two different locations along the astmm shaft.
Analog data acquisition systems are speci? For piles with diameters larger than mm, attach the accelerometer at a minimum of three locations so that an integrity s near the pile head may be made for each localized section of pile. Often, this method gives sufficient information for integrity evaluation. Alternately, the pile head force can be measured as well.
Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results. Last previous edition D — The displayed data should include the velocity and force optional records with time, an indication of the pile length and assumed material wave speed and a representation of the shape and magnitude of the ampli?
If the pile head is not accessible, as when already integral with the structure, the sensor s may be attached to the side of the pile shaft. Comparison of results from several piles from the site with similar construction is recommended to assess the typical response with the same ampli?
Also, the test may identify minor impedance variations that may not affect the bearing capacity of the pile. No other units of measurement are included in this standard. A contingency plan should be formed that allows the engineer to possibly perform further tests or dictate pile repair or replacement prior to the integrity testing, in case a serious defect is indicated. Reliable results depend on many factors; Practice D provides a means of evaluating some of those factors. Ensure that the apparatus is capable of displaying the signal from each selected blow for a minimum period of 30 s.
If the pile head is contaminated, remove a sufficient pile section to reach sound concrete. Users of this test method are cautioned that compliance with Practice D does not in itself assure reliable results. Average the suitable records of several impacts and apply necessary ampli?
Alternatively, the hammer may have an accelerometer attached and the measured acceleration may be 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. Link to Active This link will always route to the current Active version of the standard.
The method works best on solid concrete sections, and has limited application to unfilled steel pipe piles, H piles, or steel sheet piles. The time domain record is then evaluated for pile integrity.
This test method is applicable to long structural elements 58882 function in a manner similar to any deep foundation units such as driven piles, augeured piles, or drilled shaftsregardless of their method of installation provided that they are receptive to low strain impact testing. Ensure that the pile head surface is accessible, above water, and clean of loose concrete, soil or other foreign materials resulting from construction.
If records are not repeatable, do not use the data. If damage is suspected during use, recalibrate or replace the accelerometer. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Precision and Blas astk. The uniformity and accuracy of the digital sampling frequency is critical; the clock jitter sampling frequency accuracy must be within 0. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Additional locations should be considered for piles with diameters greater than mm. If the cause of poor data is not a astmm sensor attachment problem but rather is found to be a transducer malfunction, repair or recalibrate it before further use. The apparatus shall be capable of transferring all data to a permanent storage medium. Active view current version of standard. Note 1 he quality of the result produced by this test method is dependent on the competence of 58882 personnel performing it, and the suitability of the equipment and facilities used.
The apparatus shall be able to apply increasing intensity ampli? Such further use and interpretation of the data is a matter of engineering judgment and experience. The low strain impact should be applied to the pile head within a distance of mm from the motion sensor.
The apparatus must have?