Ultrasonic concrete strength meter: what is the essence of the method, models of devices used

A basic building material used in construction all over the world is concrete. For the safety and longevity of structures, it is essential to ensure its strength and durability. Using ultrasonic concrete strength meters is one of the more sophisticated methods for determining the strength of concrete. Without causing any damage to the structure, this non-destructive testing method provides a dependable way to measure the integrity of concrete.

Utilizing sound waves is the fundamental component of the ultrasonic approach. These instruments send ultrasonic pulses through the concrete, and they measure the strength of the material by timing how long it takes for the waves to pass through it. The density and elasticity of the concrete affect the sound waves’ speed, which gives a precise evaluation of its state.

Ultrasonic concrete strength meters come in a variety of models, each intended to satisfy a distinct testing requirement. The James Instruments V-Meter MK IV, the Controls Ultrasonic Pulse Velocity Tester, and the Proceq Pundit are a few well-known models. With features like data storage, digital displays, and connectivity options, these devices are effective and easy to use in the field.

Although using an ultrasonic concrete strength meter is simple, accurately interpreting the results takes some experience. Accurate measurements require precise calibration and a solid understanding of the material properties. Engineers and inspectors who have to assess the concrete quality of both new and existing structures to make sure they adhere to safety regulations will find this method to be of great use.

Methods for assessing the strength of concrete

GOST 18105-2010 specifies procedures and plans for tracking every kind of standardized strength (at design and intermediate age, release, and transfer).

Destructive

GOST 10180-2012 and GOST 28570-90 provide guidelines for determining the ultimate strength for axial tension, compression, tension during splitting, and bending. The forces required to destroy control samples are measured in order to determine the strength of concrete. This is accomplished by first applying a static load that increases steadily, and then calculating the stress under that force.

Crucial! Samples in the form of a prism, cylinder, or cube are tested (depending on the measured indicator).

These techniques are applied when it is feasible to gather a piece of a concrete structure without causing harm to it or when samples need to be prepared prior to pouring.

Non-destructive (direct)

The guidelines in GOST 22690-2015 are followed when testing this method.

Depending on the mechanical impact or indirect strength characteristic, different control methods are used:

• tearing with chipping;
• rib chipping.

The indicators displayed in the picture determine the method that is chosen:

Non-destructive (indirect)

Pre-established calibration dependencies, such as the concrete’s strength as assessed by a destructive or direct non-destructive method and indirect characteristics measured by devices compliant with GOST 22690-2015 and 17624-2012 requirements, are employed to ascertain the strength.

The subsequent techniques are employed:

• plastic deformation;
• tearing.

An essential tool in the construction sector, an ultrasonic concrete strength meter provides a non-destructive way to evaluate the strength and integrity of concrete structures. The way this method operates is by passing ultrasonic pulses through the concrete and timing how long it takes for the waves to pass through. The information gathered aids in determining the density and quality of the concrete, guaranteeing its longevity and safety. These devices come in a variety of models, each intended for a particular use case and equipped with features like data storage, digital displays, and sophisticated analysis capabilities. Without causing any harm, these meters offer a dependable and effective method of monitoring and maintaining concrete structures.

The essence of the ultrasonic method

You can find out the compressive strength of concrete used in products and structures using one of the most widely used non-destructive methods. The standard "Concrete Ultrasonic method for determining strength" (GOST 17624-2012) establishes the testing requirements. This non-destructive technique is based on the experimentally discovered dependence of instrument readings (the ultrasound signal’s speed or time of passage through concrete) on the material’s strength.

Concrete’s strength is assessed during the design, intermediate age, and structure inspection phases. By using the ultrasonic method to measure the strength of concrete, you can identify areas of reduced strength, determine the concrete’s actual class, and strip or release strength.

The determination of calibration dependencies is based on tests conducted using the ultrasonic method and the techniques outlined in the standards GOST 22690, GOST 28570, and GOST 10180 on the same sections of the structure.

The design documents specify the quantity and location of the areas where control is exercised, and this is decided by:

• tasks of taking measurements;
• type of structure;
• concreting procedure;
• reinforcement of the structure.

Structures are examined thoroughly and superficially. The sensors are positioned differently based on this. If measuring the sounding base is possible, the first option is used.

The strength of monolithic structures can be ascertained with the aid of the surface method.

Crucial! Tests are performed on a dust-free surface when there are no obvious flaws.

The location of the reinforcement is identified in the areas where sounding is conducted. Two perpendicular directions are used for measurements: parallel to the reinforcement, perpendicular to it, or at a 45-degree angle.

The figure illustrates the plan for testing samples in order to determine a calibration dependence.

Test findings have to be documented in tables.

With its non-destructive method of evaluating the strength and integrity of concrete structures, the ultrasonic concrete strength meter is a priceless instrument in the construction sector. The instrument determines how long it takes for ultrasonic waves to pass through concrete by passing them through it. This information aids in assessing the strength of the concrete and identifying any internal defects or weak points.

Ultrasonic concrete strength meters come in a variety of models, each intended to fulfill specific demands and specifications. Popular models include the Humboldt H-2987, renowned for its dependability and simplicity of use, and the Proceq Pundit Lab, which provides sophisticated features like data logging and pulse velocity measurement. These gadgets vary in complexity from simple handheld units to complex systems with powerful data analysis features.

Because it is so simple to use, both experts and novices in the field can use an ultrasonic concrete strength meter. Because the method is non-destructive, it can be applied to existing structures without causing damage, which makes it perfect for regular maintenance and inspections. Construction workers can make sure their projects adhere to safety regulations and retain structural integrity over time by using the appropriate equipment.

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