Measuring strength of concrete. Methods for testing concrete

The concrete is tested for strength by means of special devices. As a rule, they consist of sensors, as well as a conductor. Modules for devices are selected with adapters. Models differ in the accuracy of measurements, and the permissible temperature. Many devices use controllers. If we consider electronic meters, then they have a screen. In order to thoroughly understand this issue, it is recommended that you familiarize yourself with the existing methods for measuring the strength of concrete.

Methods for testing the strength of concrete

First of all, the laboratory method is distinguished. It consists in the addition of indicator substances. For this purpose, a sample is taken, and then diluted in the reagent. The second method consists in pressing the substance. The concrete strength test is done by calculating the pressure. The latter method is called non-destructive testing. For this purpose special devices are produced.

Mechanical Measuring Instruments

The compressive strength of concrete can be checked using mechanical meters. They provide a tube to which a wire sensor is connected. It leaves a special contactor, which closes on the plate. Many modifications work with all brands of concrete. Contacts in the device have high conductivity. To check the strength of concrete for compression, a catcher is used. As a rule, the data is shown by an arrow.

Electronic Measuring Instruments

Recently, electronic modifications are in high demand. Models use a special unit. It receives data on the parameters of concrete. With the help of the module, all information is calculated. Many models have the option of entering initial data. The microcircuits of such meters are of the contact type.

Calculation of concrete is due to the operation of the module. There are no catchers in this case. The sensors are used with low conductivity filters. Most devices have a high correlation threshold. The maximum permissible temperature of the meters is 45 degrees. Cases are often made of plastic, and the sensors are made of an aluminum alloy.

Low-precision devices

Measuring strength of concrete of low accuracy, as a rule, are used on construction sites. These devices can be manufactured with a mechanical sensor. Most models are equipped with contact transmitters. If we consider the meter Beton Pro Condtrol, then it gives an error in the region of 0.3%. At the same time, the correlation coefficient is rather high.

Conductivity in the meters of this type is not very good. The minimum permissible temperature is about -15 degrees. If we consider the Onyx device, then it is not allowed to be used in high humidity. The autocalibration option is provided in almost all meters. The minimum level of strength for the measurement is 3 N. Concretes can be tested in different grades. Catchers for models are of low sensitivity. If we talk about advantages, it is also worth noting that the devices are cheap.

High precision models

Checking the strength of concrete, a high precision device can be very useful. Devices of this type, as a rule, are used by professional builders. Also, modifications are actively used in the laboratory. The models are equipped with special electrode sensors. They process the data on the density and humidity of the sample. Also it should be noted that they can work at elevated temperature. The probes in the devices are of the channel type. The minimum permissible temperature of the meters is about -10 degrees.

Contactors in devices are used with expanders. Control units are used with a microprocessor. If we consider electronic devices, they often have modules installed. The concrete calculator is calculated using a controller. Cards are used to store data. The accuracy of data processing is quite high. In this case, the error coefficient of maxima is 0.2%. Catchers are used with transmitters, and without them.

Devices with electronic unit

Devices on electronic blocks, as a rule, are sold with a probe. Some modifications are equipped with displays for reading data. Modules for processing have high conductivity. Some meters operate at high humidity. The models fit perfectly for laboratories. The correlation coefficient in them fluctuates around 55%. In addition, it is important to note that there are meters with channel electrodes. Microprocessors under them are selected on operational amplifiers. The concrete calculator is calculated by the device thanks to the controller. Most models work with the transmitter. The minimum admissible density of concrete is 5 N.

Models with sensor

Measuring strength of concrete with sensors are valued for their compactness. Many models use channel probes. Also it should be noted that there are modifications on wire transistors. Transmitters for them are selected in a multi-channel type. The coefficient of conductivity in devices of this type is at least 5 microns. The minimum permissible temperature of the meters starts from -15 degrees. Most devices operate at high humidity.

If we consider electronic modifications, then they use a module with an auto-calibration function. Contacts are selected in different forms. Also on the market are specialized diode devices with a display system. Quite often they are used in large construction enterprises. Modules for them are suitable for high conductivity. Also it should be noted that catchers are installed on the meters, and devices from lithium batteries operate.

Devices with a sclerometer

Measuring strength of concrete with a sclerometer is characterized by high accuracy of indications. Most models are made with contact sensors. Some devices are able to boast a high coefficient of conductivity. At the same time the sensitivity index starts from 4.5 mV. The minimum permissible temperature of the meters of this type is -10 degrees. Sclerometers are installed with tubes at the end of which there is a catcher. The contactor is attached to a special holder. Data, as a rule, is displayed. For fast data processing, a modulator is installed. Some devices are made with a chip that is capable of storing data.

Devices with data archiving function

Models of this type are produced with cards that read information from the control unit. Probes in devices are used in different directions. Microprocessors, as a rule, are used with impulse conductors. Contactors are of different shapes. Most devices operate from a dipole modulator. If we talk about compact devices, they have a short tube. The sensor is of the same type.

The coefficient of conductivity in devices reaches 4.3 microns. In this case, the sensitivity is a maximum of 9 mV. The minimum permissible temperature of the meters of this type is -20 degrees. Transmitters are used with channel conductors. Filters are often placed at 4 pF. Catchers are installed quite rarely. Lithium batteries are used for charging models. Most meters support automatic calibration.

Models with pulse sclerometer

Strength meters of concrete of this type have good sensitivity. They are capable of automatic calibration. Appliances for different brands of concrete are used. The minimum permissible temperature of the meters is -10 degrees. Contacts they use positive conductivity. Most modifications are equipped with only one probe. In this case, the transmitters are used on two outputs. Data processing for models takes a lot of time. Some devices are made with dipole modulators. The main disadvantage of devices is a low correlation coefficient.

Modifications with a diode sclerometer

Devices with diode sclerometers can quickly measure strength. Data processing does not take much time. Some devices are manufactured with flat displays, which differ in the resolution parameter. It should also be noted that there are gauges with contact probes.

The concrete is diagnosed with a modulator. Most models can be used in high humidity. The minimum permissible temperature of the meters of this type is -10 degrees. Electrodes in this case are installed in the tube. Some models are equipped with dipole catchers. Protection systems for meters are used in class P40.

Professional Models

Professional modifications work only on wired modules. Contacts at them are established with conductivity from 5.5 microns. Devices are well protected, and are not afraid of high humidity. In addition, they have the function of calibration, and data archiving. Control units are used with the microcircuit. Some devices are powered by lithium batteries. Also there are modifications on batteries. Accuracy of measurement in devices starts from 98%. Probes are of tubular type. Protection systems, as a rule, are used in class P55. Most meters are made with displays.

Compact devices

Compact meters are manufactured with dipole catchers. In this case, the tubes are of small diameter. Most devices are made without probes. It should also be noted that there are modifications of low conductivity. The correlation coefficient for them is only 60%. Microprocessors can work on filters. The minimum permissible temperature of compact meters is -10 degrees. Batteries are often used in small capacity. Electrodes in devices are made with a sensitivity of 3 mV. The coefficient of permittivity is not more than 30%. The automatic calibration function is not available in all devices.

Models of Glatec

Devices of this brand are distinguished by quality probes. Some models are actively used in construction companies. The minimum level of strength for measurement is 3 N. The microcircuits in the devices are used for high conductivity. Calculation of concrete occurs very quickly. Contacts for models are installed with transmitters, and without them.

The sensors are applied at 3 and 5. mV. The correlation coefficient, as a rule, is about 60%. The minimum permissible temperature for the meters of this trade mark is at least -10 degrees. In addition, the company specializes in the production of high conductivity models. The sensitivity parameter is induced at 4.5 mV. Many modifications are made with contactors.