This method is particularly useful for large diameter pile foundations for major structures like river bridges, towers, initial piles (before load testing). The method is standardized as per ASTM D6760 and determines the quality and consistency of concrete between pairs of PVC or steel tubes (usually 38 -53mm and filled with water) pre-installed in bored piles, wall panels, concrete foundations. The output is in the form of waterfall map along with wave speed and energy or amplitude plot. |
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| APPLICATIONS & BENEFITS |
- Test carried out after 7 days from casting and can give early warning signs
- Sonic testing is intended to give information regarding pile lengths, homogeneity / integrity of concrete quality
- Able to locate defects in piles with regard to depth, character and severity
- Applicable for piles of flyovers, bridges, jetties, multi-storey buildings or where pile integrity is questionable
- Assessment of homogeneity / integrity of concrete in pile
- Non destructive
- Inexpensive
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| LIMITATIONS |
- Access-tubes have to be pre-installed in the pile
- Does not address the question of pile capacity
- The number of access tubes affect the quality of the data and hence the interpretations
- Fabrication and installation of access tubes
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