Concrete may appear tough enough from afar; however, numerous problems with cracks, voids, honeycombing, poor areas, and other defects emerge deep inside it long before becoming visible to an unaided eye. This is the reason why precise concrete evaluation is crucial as well. Structure’s integrity, reliability, longevity, and overall performance depend largely on its internal condition rather than appearance.

Fortunately, this is precisely the problem that can be solved easily and reliably with an ultrasonic pulse velocity tester. Thanks to non-destructive testing, engineers get an opportunity to assess the concrete quality accurately without risking damaging their structure in the process. Widely used worldwide, this type of testing provides great results. Thus, using an ultrasonic pulse velocity tester for concrete will allow you to get accurate and relevant information about your building’s internal condition.

 

Why an Ultrasonic Pulse Velocity Tester for Concrete Is Important?

 

As you know, concrete is subject to numerous adverse effects in the course of operation, such as environmental stresses, heavy loads, temperature changes, ageing, and more.

With the help of an ultrasonic pulse velocity tester for concrete, it is easy to measure how quickly sound waves travel through the material. The device measures the pulse transmission time from the transmitting to the receiving transducer, then multiplies it by the distance to calculate pulse velocity.

Usually, the higher the velocity of pulse transmission through concrete, the denser, more uniform, and, accordingly, the higher the quality of the material.

Conversely, slower pulses may indicate the presence of cracks, voids, honeycombing, and poor areas.

 

What You Need to Know About Your Equipment Before Testing

 

Accurate and reliable test results start with good preparation. For example, you need to prepare all materials and equipment for testing in advance.

Typically, you will require the following:

• Ultrasound tester for concrete
• Transmitting transducer
• Receiving transducer
• Coupling gel/grease
• Distance/measuring tape
• Clean surface

Moreover, you should calibrate your equipment according to the instructions provided by the manufacturers.

 

The Process of Performing Tests With an Ultrasonic Pulse Velocity Tester

 

●        Preparation of the Surface

The first step of testing includes surface preparation. Make sure that there is no dirt, dust, paint, debris, or any other contaminants.

●        Application of the Coupling Gel/Grease

Coupling material should be applied onto a surface between the transducers and the testing surface to ensure good acoustic contact.

●        Transducers Placement

As a rule, it is recommended to use direct transmission when placing transducers in the right positions on opposite sides of concrete elements being tested.

However, there are some cases when semi-direct and indirect placement of transducers can be used because of special conditions.

●        Measurement Taking

When transducers are positioned properly, pulse transmission through the concrete starts automatically.

●        Taking Multiple Readings

It is impossible to receive accurate and full information about the concrete condition relying only on one reading. Thus, it is necessary to take multiple measurements at various locations of the concrete element being tested.

 

Advantages of Pulse Velocity Testing for Concrete

 

There are numerous benefits of using this technology for testing concrete.

Most importantly, non-destructive ultrasound testing ensures accuracy and prevents damage of the structure during tests.

Among other advantages, it should be mentioned that:

• Fast, precise testing
• Ability to detect invisible defects
• Assessing concrete homogeneity
• Effective maintenance planning
• Saving costs by revealing concrete defects in advance
• Supporting quality assurance programmes
• Enhanced asset management

Nowadays, digital features of ultrasonic pulse velocity test equipment make the process easier.

 

How to Ensure Reliability of Your Tests?

 

A properly conducted testing procedure is a key element to getting accurate results. To conduct ultrasonic pulse testing properly, it is important to follow best practices. They include:

• Proper equipment calibration
• Ensuring good contact of transducers with the surface
• Conducting multiple measurements
• Recording of all environmental conditions
• Compliance with manufacturer guidelines
• Use of professionally-trained personnel

 

Conclusion

 

Pulse velocity testing of concrete is one of the most popular types of concrete inspection. By measuring the speed of ultrasound transmission, it is possible to detect numerous defects within a structure. Moreover, the non-destructive nature of ultrasonic testing allows for performing inspections without putting the concrete structure at risk.

For those who need reliable ultrasonic equipment for concrete tests, RTUL Group International is here to offer innovative ultrasonic technologies developed on the basis of years of extensive research, manufacturing, and technological expertise.