The ultrasonic pulse velocity test is one of the most common non-destructive testing technique used to test hardened concrete. It tests the integrity and quality of the in-situ concrete structure which can be used to indirectly estimate the strength. The method provides a very simple but cost effective test to evaluate quality of concrete, cracks or defects in the structure. The key to evaluation is selection of proper locations for the test and sampling to ensure good structural evaluation. Geo Dynamics has used UPV to test concrete structures and rock samples both.

The test is conducted by placing UPV probes opposite to each other, at right angles or in series depending on the purpose of the test.

 The velocity so obtained from the test depends on  the density, uniformity, porosity, & elasticity of the tested concrete. Geo Dynamics is equipped with several world class PROCEQ equipment that conform to international standards for UPV testing of  both old and new concrete structures. Our low frequency probes are capable to evaluate upto 5m thickness of concrete in most cases. With the rise in the ultrasonic pulse velocity, it is confirmed that the concrete is of good quality & slower velocity indicates poor concrete quality.

Precautions: Although the test looks simple and the equipment is easy to operate, it is more important to understand the specific requirements at site before recommending or conducting the tests. Interpretation can be tricky and mere UPV values may not imply a good or bad structure. It is best to combine UPV also with other tests, visual inspection before arriving at an engineering judgment on the quality and possibly the compressive strength of concrete. Poor sampling or improper selection of test locations may lead to incorrect findings.

Codes: Geo Dynamics conforms to BS:4408, ASTM C:597 and IS:13311 (Part:1)-1992