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ASTM D5882 Requirements for Pile Integrity Test

Pile integrity test is to serve as a screening process to identify acoustically anomalous piles. It is low strain dynamic test (a light impact is applied to a pile it produces a low strain) based on wave propagation theory. The impact produces a compression wave that travels down the pile at a constant wave speed. Changes in cross sectional area - such as a reduction in diameter - or material - such as a void in concrete - produce wave reflections.

This procedure is performed with a hand held hammer to generate an impact, an accelerometer or geophone placed on top of the pile to be tested to measure the response to the hammer impact, and a data acquisition and interpretation electronic instrument.
Pile Echo Tester:USB Model
A pile and Its Reflectogram
These tests shall be performed in accordance with ASTM D5882 “Standard Test Method for Low Strain Integrity Testing of Piles”. The requirements of this standard are:
Pile Echo Tester:Bluetooth Model
Item
Description
Requirements
5.1.1.
Impact force application
Hammer with hard plastic tip
5.2.1.
Accelerometer linearity
Up to 50 g
5.2.1.
Accelerometer time constant
≥0.5 sec
5.2.1.
Resonant frequency
≥ 30 kHz
5.2.1
Calibration accuracy
5%  
5.3.
Signal transmission
Low-noise shielded cable
5.4.1.
Apparatus
Permanent graphic display
5.4.1.
Apparatus
Permanent data storage capability
5.4.1.
Apparatus
Blow averaging capability
5.4.1.
Apparatus
Variable amplification
5.4.1.
Apparatus
Filtering capability
5.4.2.
Recording apparatus
12 bit A/D resolution
5.4.2.
Sample frequency
25 kHz
5.4.2.
Clock jitter
≤0.01%
5.4.4.
Signal duration scale
2 L/c plus 5 msec

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