SU815502A1 - Concrete mix compaction quality indicator - Google Patents

Description

The invention relates to the measurement of the physical characteristics of materials by electrical methods and is intended to control the quality of compaction of vibrating media, such as concrete mixtures.

A known indicator of the quality of compaction of concrete mixture containing an AC source, a meter and a sensor electrode 111.

The disadvantage of this indicator is that after each measurement, it is necessary to remove the sensor - electrode from concrete, which is especially time-consuming when determining the quality of working 15 km of the mixture in the aeon of contact of the layers of thickness Hqp .75-1.0 m.

Closest to the proposed one is an indicator of the quality of compaction of concrete • containing an alternating current source, a main sensor electrode and a meter including a rectifier bridge, an ammeter, an adjustment resistor and a transformer, 25 whose primary winding is connected to an alternating current source, and the secondary winding is connected through adjusting resistor in one of the diagonals of the rectifier bridge 12]. thirty

This indicator allows you to set the moment of completion of compaction of the concrete mixture, and the moment of completion of compaction is visually recorded by the operator on the meter, which controls the vibration seals. Constant monitoring of the indicator readings tires the operator and leads to a decrease in labor productivity in concrete laying works.

The purpose of the invention is improving the reliability of the indicator.

This goal is achieved by the fact that in the quality indicator of concrete compaction, containing an alternating current source, the main electrode electrode and a meter, including a rectifier bridge, an ammeter, an adjustment resistor and a transformer, the primary winding of which is connected to an alternating current source, and the secondary winding is through an adjustment resistor in one * of the diagonals of the rectifier bridge, an additional sensor is introduced - an electrode, a storage device, a comparison element, an alarm unit and a switch, and the sensor and - the electrodes are connected to a switch that is connected to the primary winding of the transformer and to one of the inputs of the storage device, the other inputs of which are connected through an ammeter to the other diagonal of the rectifier bridge, and the output of the sensor is connected through the comparison element to the signaling unit. ^5, the drawing shows the quality indicator of concrete compaction.

The indicator contains an AC source 1, meter 2, switch 3, sensors - electrodes 4 and 5, which are mounted on a frame 6 together with a vibrator 7 suspended on a crane hook 8, a memory device 9, a comparison element 10, an alarm unit 11. The meter includes · 15 itself a rectifier bridge 12, an ammeter 13, an adjustment resistor 14 and a transformer 15.

The indicator works as follows. 20

The vibrator 7 with a crane 8 is lowered into the concrete mixture, which must be compacted. Together with the vibrator, which dilutes the concrete mixture, it easily includes sensors - electro 25 and 4 and 5, mounted with it on the beam.

Since the sensors are immersed in the concrete mixture at different distances. from the vibrator, then from each of them to the meter unit through switch 3, alternately either from one or from the other, electrical signals of different magnitudes are received, while a signal is coming from one of the sensors - electrodes, the signal level from the other sensor to the switching moment is fixed by the storage device 9. Then, in the same way, the signal from another sensor, the elec-40 of the troda, is recorded in the storage device. After each switching cycle, at the command of the switch, the signals enter the comparison element, which is triggered and gives an impulse to the alarm unit only when the signals are aligned.

The signal from the alarm unit enters the crane control panel, and the crane operator extracts the vibrator from the concrete mixture.

Claims (2)

The invention relates to the measurement of the physical characteristics of materials, by electrical methods, and is intended to control the quality of the compaction of vibrating media, for example, concrete mixtures. A known indicator of the quality of compaction of a concrete mix, containing an alternating current source, a meter and a sensor - electrode 111. The disadvantage of this indicator is that after each measurement it is necessary to remove the sensor - the electrode from concrete, which is especially difficult when determining the quality of working the mixture in the zone of contact of layers Thickness is HI .O, 75-1.0 m. The closest to the proposed one is an indicator of the quality of compaction of a concrete mix, containing an alternating current source, a main sensor, an electrode and a meter, which turns on A primary bridge, a singlemeter, an adjusting resistor and a transpochator whose primary winding is connected to an alternating current source, and the secondary winding through an adjusting resistor to one of the straightening bridge 12 diameters. This indicator allows you to set the end of compaction of the concrete mix, and the end of the compaction the meter is recorded by the operator, who provides control of the vibrating compactors. Continuous observation of the indicator readings will tire the operator and lead to a decrease in labor productivity during the concrete-laying work. The purpose of the invention is to increase the reliability of the indicator. The goal is achieved by the fact that the indicator of the quality of compaction of a concrete mix, containing an alternating current source, the main sensor electrode and a meter, including a rectifying bridge, an ammeter, an adjusting resistor and a transformer, the primary winding of which is connected to an alternating current source, and the secondary a resistor is inserted into one of the diagonals of the rectifying bridge, an additional sensor is inserted — an electrode, a memory, a reference element, an alarm unit and a switch, and yes snips - electrodes connected to a switch which is connected to the primary winding of the transformer and to one of the inputs of the memory device is of the other inputs of which are connected through an ammeter to the other diagonssh bridge rectifying unit, and an output device through eapomi stsoschego comparing element is connected to the unit tion by sig. The drawing shows the indicator IjiecTsa. compaction of concrete bold. The indicator contains an alternating current source i, meter 2, switch 3, sensors — electrodes 4 and 5, which are mounted on the frame in common with the vibrator 7, suspended on the crane hook 8, memory 9, comparison element 10 / alarm unit 11. The meter includes a rectifying bridge 12, an ampere 13, an adjusting resistor 14 and a transformer 15.. The indicator works as follows. Vibrator 7 by crane 8 lowering into the concrete mixture, which must be compacted. Together with the vibrator, which dilutes the concrete mix, sensors easily enter it — electrons 4 and 5, reinforced with it. on the traverse. Since the sensors are immersed in the concrete mix at different distances. from the vibrator, then from each of them, alternately from one, then from the other, electrical signals of different sizes come to the measuring device through the switch 3, while the signal from one of the sensors, electrodes, the signal from the other sensor at the moment of switching, the memory from the memory device 9 is fixed. Then, the signal from another sensor, the electrode, is also recorded in the memory in the same way. After each switching cycle, a switch command is sent to the reference element. which is triggered and gives a pulse to the signaling unit only when the signals are equalized. The signal from the alarm unit goes to the console, controls the crane, and the crane removes the vibrator from the concrete mix. The invention The indicator of the quality of a concrete mix containing an alternating current source, a main sensor electrode and a meter, including a rectifying bridge, an ammeter, a control resistor and a transformer, the primary winding of which is connected to an AC source, and the secondary through a control resistor diagonals of the bridge with a bridge, characterized in that, in order to increase the reliability of operation, an additional sensor is inserted in it - an electrode, a memory device, a comparison element, an alarm and a switch, the sensors being electrodes connected to a switch that is connected to the primary winding of the transformer and to one of the inputs of the storage device, the other inputs of which are connected through an ammeter to another diagonal of the rectifying bridge, and the output of the storage device through the comparison element is connected to alarm unit. Sources of information taken into account during the examination 1. Salon G..A. et al. Measuring the electrical conductivity of cement paste at low frequencies using Polarizing electrodes. Instruments and devices of the construction industry. Issue 2. Kiev, Construction, 1965. 2 USSR Copyright Certificate No. 613198, cl. G 01 D 11/00, 1975.