SU1522087A1 - Apparatus for determining strength of concrete - Google Patents

Abstract

The invention relates to non-destructive testing of materials and can be used to determine the strength of concrete over the time of ultrasound propagation. The purpose of the invention is to improve the accuracy of determination by automating the calibration process. The device operates in three modes: the mode of measuring the time of passage of ultrasound, the recording mode of the calibration dependence in the storage unit 15 and the mode of measuring the strength of concrete. Pressing the button 19, on the counter 13 gain strength values. The corresponding state of each strength value according to the calibration dependence is dialed on the counter 11 by the ultrasound propagation time by pressing the button 20. Button 21 allows counters 11 and 13 to be switched to the reverse mode, which speeds up the data acquisition process. When recording the calibration dependence, the button 17 is closed, and the strength code is typed on the meter 13, and the propagation time code is typed on the meter 11. Thus, the strength value with the propagation time address is entered into the cell of the storage unit 15. In the mode of measuring the strength of concrete from the block 15, the strength values are transmitted through the switch 22 to the indicator 12. 3 sludge.

Description

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The invention relates to the non-destructive testing of materials and can be used to determine the strength of concrete by the time of propagation of ultrasound.

The purpose of the invention is to improve accuracy.

Figure 1 presents the block diagram of the device; on - time diagrams; FIG. 3 shows the calibration dependence of the strength on the time of passage of ultrasound.

The device contains a series-connected generator V probe pulses 5 acoustic emitter 2, probe product 3, receiving transducer 4, amplifier 5, amplitude discriminator 6, time interval meter 7, element 8I, the second input of which is connected to the output of the sensor 9 calibrated pulses, as well as a synchronizer 10 connected to a generator of 1 probe pulses and a meter 7, a reversible counter 11 and an indicator 12, a reversible counter 13, a logic element 14 EPI, a storage unit 15, a generator 15, an impulse The buttons, buttons 17-21, co1 istator 22 and shaper 23 (FIG. D),

The device works as follows.

A probe pulse generator 1 is generated by a synchronizer signal 10 which produces an electrical signal that is converted by the emitter 2 into an acoustic pulse. Passing the acoustic signal through the item being monitored, is received by the receiving transducer 4, amplifier 5 passes through discriminator 6, meter 7 and goes to element 8 AND. Thus, the state of counter 11 corresponds to the propagation time of the ultrasonic pulse through the product. The signal from the output of the counter 11 controls interrogation of the corresponding state of the cell of the block of the storage unit 15. Depending on the state of the button 18, the signal of the state of the counter 11 or the contents of the storage unit 15 "is output to the indicator 12 via the switch 22.

Calibration dependence distribution time - strength for concrete is built in the usual order - distribution time is read from the display unit, strength value

5 0 5 b

.Q with

five

0

is determined by the results of sample use. After obtaining the calibration dependence of the additional generator 16 at a frequency of / -1 Hz, pressing button 20 performs enumeration of all states of counter 11, and for each state of counter 11 by pressing button 19, counter 13 is set to the state corresponding to the strength value at a given time spread ultrasound. When the information button 17 from the counter 13 is pressed by the shaper 23, the signal is anosized in the memory cell of the block 15. Thus, the calibration time dependence - strength is stored in the device memory block. If necessary, any portion of this dependence can be easily changed without changing the rest parts of it.

The device allows you to implement any functional connection.

I

(T)

where R is the strength of concrete;

T is the propagation time of ultrasound.

The magnitude of the error of recalculation of the time of ultrasound propagation into strength does not depend either on the width of the range of the measured strength, or on the nature of the R – T dependence, but is determined only by the step of sampling the strength values. At the same time, there is no need for mathematical processing of the results of calibration tests in order to obtain a calibration dependence in analytical form.

In the device, the reference point is set by triggering the meter 7, which time selects the received signal relative to the probe pulse and controls element 8 and whose duration C is determined by the propagation time of the ultrasound and reflected as a digital code on the counter 11. The use of the selector allows increasing noise immunity of the device, since during the interval T ,,,,, meter 7 does not pass the received signals. The duration of the protection time interval 1 and the operating interval T. are constant and are selected depending on the measurement range and the selected base. It is necessary to indicate that the base of the installation of the radiator 2 and the receiver 4 is fixed and determined by the design of the device.

The device can operate in three modes;

Ultrasound transit time measurement mode - used to obtain a calibration dependence (T);

the mode of recording the calibration dependence in the device memory;

mode of measuring the strength of concrete

The operator obtains the calibration relationship between the strength of concrete and the time of ultrasound transmission using the proposed device and an additional one that implements some reference method, for example, the method of press testing samples

dependencies for various types of concrete; he doubles accordingly, tripled, etc.

When recording the calibration dependency, the button 17 is closed, the form 23 generates signaling control signals, and the value code is prefixed on the counter 13

0 and RJ; on counter 11, the code for the propagation time is D-,, so the image in the cell of block 15 with address C; the value of R is set.

15 of concrete strength button 17 is disconnected, the shaper 23 forms a read signal from block 15, with e from the memory cell with address f. values of R- through the switch goes to and

J T. .VV l-tJl4 jr J. / and tl. l j / l 4i "

before the destruction. The device measures jo indicator, diodes Vj ... V. serve for

the time of passage of ultrasound in the sample, and the reference method is used to determine the strength of this sample and, based on the data obtained, a calibration curve is constructed (Fig. 3).

The resulting relationship is entered by the operator into the storage unit 15. The order of recording the strength-time calibration according to the next I (figure 1).

Pressing the button 1U, the operator alternately dials on the counter 13 strength values R .. Each value of RJ according to the calibration dependence finds the corresponding value of the propagation time -, -, which the operator dials on the counter 11 by pressing the button 20. Button 21 allows to translate counters 11 and 13 from the summation mode to the subtraction mode, which allows to simplify and accelerate the set of codes for propagation time and strength, respectively, on the meters 11 and 13 without zeroing them and supporting the block 15 and the counter 13 in the information reading mode .

The switch allows to give an indicator, depending on the state 25 of the button 18, the state of the counters 11 and 13, which is necessary when constructing the calibration dependence and writing to block 15,

Claims (1)

30 claims A device for determining the strength of concrete, containing a series-connected synchronizer, a probe pulse generator, and an active exponent, connected in series by a acoustic wire35 40 nick, amplifier and amplitude disc minator, time meter, shaft sensor, gauge pulse pulse, element I, the first reversible counter and indicator, different in that, in order to increase accuracy, it is equipped with dependencies for various types of concrete; it doubles accordingly, triples, etc. When recording the calibration dependence, the button 17 is closed, the imaging unit 23 generates the recording control signals, while on the counter 13 the code of the strength value RJ is pre-typed; on counter 11, the propagation time code is D-,, thus, in the cell of block 15 with address С; the value R is indicated. Further, when the device is in control mode Concrete Strength, button 17 is open, shaper 23 generates a read signal from block 15, and from the memory cell with address f. the value of R- through the switch goes to T. .VV l-tJl4 jr J. / and tl. l j / l 4i " LED, diodes Vj ... V. serve for opening of unit 15 and counter 13 in the information reading mode. The switch allows the indicator, depending on the state of the button 18, to provide the state of the counters 11 and 13, which is necessary when constructing the calibration dependence and writing it into block 15, Invention Formula A device for determining the strength of concrete, containing a series-connected synchronizer, a generator of probe pulses, and an acoustic rectifier, successively t nick, amplifier and amplitude discriminator, time interval meter, gauge of calibration pulses, element I, the first reversible counter and indicator, characterized in that, in order to improve accuracy, it is equipped with the next brute force of the intermediate ones is connected by means of a so- ton generator. Block 15 is executed by energy pulses, the first button, the second dependent for storing the calibration dependence in the off state of the device, and reprogrammable for possible changing the calibration dependence, for example, on semiconductor integrated circuits of the K573, K1601, Kr188, K537 series, etc. The storage capacity and its organization are determined by the strength measurement range (time of interception) and the requirement of measurement accuracy. In addition, its volume can be expanded for the purpose of storing in it several calibration values. five a reversible counter and a switch, the output of which is connected to the indicator, an OR element connected between the input of the first reversible counter and the output of the And element, the first and second inputs of which are connected respectively to the outputs of the sensor of calibrated pulses and the time meter. torment, the second button connected between the output of the pulse generator and the second input element OR, sequentially connected by a source of unit potential and the third a button connected to the control inputs of reversible meters, connected to their outputs by a storage unit, the fourth and fifth buttons, connected respectively between the source of a single potential and the control inputs of the storage 3e dvpyfOUiUU, uf ny / fttc CusMOff Ooty / Gee paSov (/ u sienol itsf fpume / tit 7 Buofofffftn / sienvl uzm rete / t 7 / Editor N.Gorvat p.z. Compiled by L. Kondrykinsk Tehred M. Khodanich Proofreader t.Paly the unit and the switch, the second input of which is connected with the outputs of the second reversible counter and the storage unit, and the outputs of the amplitude discriminator synchronizer are connected to the inputs of the time interval meter. Siensgp