Arun Soil Lab Pvt.Ltd.
Geotech and Material Consultants
Ensure and Assure safety of the structures for a better
And safe place to live and work with strong foundation

Quality Consiousness is Our Core Concept

Certificate No. : TC-5382
NABL Accredited as per
ISO/IEC: 17025 - 2005

NON-DESTRUCTIVE TESTS
Pile Integrity test (IS : 14893 - 2001)
INTEGRITY TESTING OF PILES BY PILE INTEGRITY TESTER
  • Pile Integrity Testing (P.I.T), a low strain method for integrity testing of driven piles and drilled shafts, uses a variety of techniques for the interpretation of force and velocity records taken under the impact of a light hammer blow. This is a system of assessing the integrity of piles by the use of low stress wave imparted to the pile shaft and is also known as Sonic Integrity or Sonic echo method.
PEM IMPLEMENTATION
  • A small impact is administered to the pile's surface, generally using a special hand-held hammer, and an acoustic wave from the impact propagates down through the pile. Variations in the shape and material quality of the pile produce reflections of the wave, which are observed as they return to the surface. Surface vibrations are recorded until all primary reflections have been observed. Reflections are then interpreted, considering their nature and times of observation, to assess pile integrity.It is very important to first grind the top surface to create level and smooth zones for placing the accelerometer and applying the blows. Pile top preparation is a key to good data, which is fundamental for a better interpretation.
INTERPRETATION OF RESULTS
  • The interpretation of results consists of evaluation of data based on the reflections recorded during testing as described above. Reflections are produced by variation in shape, materials, Soil resistance changes, joints etc. The integrity of the pile thus tested is based on such reflections and detected changes in impedance (EA/c) along the pile length when subjected to an impact blow. Here E is the elastic modulus of the pile material, A is cross-sectional area of the pile and c is the wave speed. Impedance variation usually refers to cross - sectional change.
LIMITATIONS OF TEST SYSTEM
  • The test method can generally evaluate for piles upto an L/D ratio of 45 to 60.
  • For piles with greatly varying cross-sectional area especially in layered soils, it may be difficult to distinguish relevant reflections due to construction method and those due to localized discontinuities. Cannot locate defect in cross-section.
  • Although the test system can be used to evaluate length of piles, the determination of pile length is approximate
  • within a range of 5 -10% due to variation in concrete density. This implies that the method cannot evaluate defects that could be present in the bottom 5% -10% of the pile shaft.
Testing of Concrete by Rebound Hammer (IS : 13311- Part 2 - 1992)
  • The concrete test hammer is a mechanical device used for performing rapid, non destructive quality testing on materials in accordance with the customer's specifications; in most cases, however, the material involved is concrete. The device is to be used exclusively on the surfaces to be tested and on the testing anvil. The device measures the rebound value R. There is a specific relationship between this value and the hardness and strength of the concrete. It is done to assess the compressive strength, quality of concrete in relation to standard requirements. The factors that are taken into account while ascertaining rebound values R are Impact direction: horizontal, vertically upwards or downwards, age of concrete, size and shape of the comparison sample (cube cylinder), Concrete 100 mm or more in thickness with a maximum particle size 32mm