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The quality of natural rocks and concrete must be tested and assessed to make sure that it is free of cracks and voids and that the building materials are suitable for the construction or project.
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The quality of natural rocks and concrete must be tested and assessed to make sure that it is free
of cracks and voids and that the building materials are suitable for the construction or project. The
ultrasonic pulse velocity test enables an in-situ, non-destructive way to check the quality of those
materials. During the test, operators can determine the quality and strength of rock or concrete by
measuring an ultrasonic pulse’s velocity as it passes through a natural rock formation or a concrete
structure. Here are more things you should know about it:
How it’s done– An ultrasonic pulse velocity test is conducted by making a pulse of
ultrasonic waves pass through the concrete that is being tested. The equipment measures
the time it takes for the pulse to travel through the structure. A high velocity generally
means the material is continuous and of good quality and slow velocities may indicate many
voids or cracks in the concrete.
The procedure– Ultrasonic pulse velocity testing equipment comes with a pulse generation
circuit. It has a transducer which has an centre frequency of 54 kHz to transform the
electric pulse into a mechanical pulse. The signal is received by the pulse reception circuit.
Together with the power source and clock, all parts are put together before calibration using
a sample of the material with properties that are known. Transducers are placed on the
opposite sides of the concrete, and pulse velocity is calculated by dividing the width of the
structure by the time it takes for the pulse to go through the material.
How results are interpreted– Using this test and an understanding of how different
factors affect speeds of sound in concrete you should be able to tell the quality of concrete
in terms of durability, workmanship, compaction, segregation, cracks, honeycombing,
internal flaws, trapped air, homogenity, and strength. The ultrasonic pulse velocity test can
be used for evaluating crack repair’s efficacy, as well as for finding the mechanical and
structural properties of concrete and natural rock.
Standards and regulations– You can find the procedure for ultrasonic testing in ASTM
C597-09. It is crucial for ultrasonic pulse velocity testing equipment to be designed after
that standard, too.