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Ultrasonic pulse velocity test for concrete

 

Introduction

An ultrasonic pulse velocity (UPV) test is an in-situ, nondestructive test to check the quality of concrete and natural rocks. In this test, the strength and quality of concrete or rock is assessed by measuring the velocity of an ultrasonic pulse passing through a concrete structure or natural rock formation.

Ultrasonic Pulse Velocity (U.P.V)
Ultrasonic Pulse Velocity (U.P.V)

This test is conducted by passing a pulse of ultrasonic through concrete to be tested and measuring the time taken by pulse to get through the structure. Higher velocities indicate good quality and continuity of the material, while slower velocities may indicate concrete with many cracks or voids


Ultrasonic testing equipment includes a pulse generation circuit, consisting of electronic circuit for generating pulses and a transducer for transforming electronic pulse into mechanical pulse having an oscillation frequency in range of 40 kHz to 50 kHz, and a pulse reception circuit that receives the signal.


The transducer, clock, oscillation circuit, and power source are assembled for use. After calibration to a standard sample of material with known properties, the transducers are placed on opposite sides of the material. Pulse velocity is measured by a simple formula:

Applications

Ultrasonic Pulse Velocity can be used to:

  • Evaluate the quality and homogeneity of concrete materials
  • Predict the strength of concrete
  • Evaluate dynamic modulus of elasticity of concrete,
  • Estimate the depth of cracks in concrete.
  • Detect internal flaws, cracks, honeycombing, and poor patches.

The test can also be used to evaluate the effectiveness of crack repair.[7] Ultrasonic testing is an indicative and other tests such as destructive testing must be conducted to find the structural and mechanical properties of the material.

Regulation and standards

A procedure for ultrasonic testing is outlined in ASTM C597 - 09.

In India, ultrasonic testing is conducted according to IS 13311-1992. This test indicates the quality of workmanship and to find the cracks and defects in concrete.

Usage

This test is recommended in some of testing done by the Indian government to certify and check construction of residential buildings.



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