SU1649428A1 - Device for determination of cement activity - Google Patents

Abstract

The invention relates to the mining industry and can be used in mining enterprises using a hardening bookmark of the developed space, as well as in construction, in laboratories for the express analysis of cement. The purpose of the invention is to improve the accuracy of determining the activity of cement. The device contains an electrolytic cell, measuring electrodes and a reference electrode, a generator, a recording device, two voltage dividers, an inverter, a potentiometer for the summation of polarization currents and zero setting, a time relay, two DC sources. 1 il.

Description

The invention relates to the mining industry and can be used in mining enterprises using a hardening bookmark of the developed space, and can also be used in construction, in laboratories for the express analysis of cement.

The purpose of the invention is to improve the accuracy of determining the activity of cement.

The drawing shows the device, General view.

The device contains an electrolytic cell 1 made of an insulating non-magnetic material, two glass carbon electrodes 2 and a comparison electrode 3, made in the form of a ring of iron. The electrolytic cell 1 is mounted on a magnetic stirrer 4, and a magnet 5 is placed inside the cell.

The measuring electrodes 2 are connected to the middle terminals of the voltage dividers 6, which are connected to the sources 7 of the direct current connected to the generator 8. The potentiometer 9 summation of polarization and zero current is connected directly to one of the measuring electrodes and through the inverter 10 to the other measuring electrode. The average output of the potentiometer 9 for the summation of the polarization and zero-setting currents is connected via a registering device 11, the contacts 12 of the time relay 13 with the points of connection of the voltage dividers, DC sources and the reference electrode.

The device works as follows

Distilled water is poured into the electrolytic cell t;

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DC sources 7, generator 8 and time relay 13. The output signal from direct current sources 7 is supplied to voltage dividers 6, while alternator square voltage in the range of 10-50 mV and frequency 500-1000 Hz is superimposed on the output voltage of direct current sources from generator 8. As a result, the mixed signal is supplied to voltage dividers 6. The last 6 set the polarization voltage on the electrodes 2. If there is distilled water in the electrolytic cell 1, then after switching on the measuring circuit and supplying the mixed signal to the measuring electrodes 2 from the voltage dividers 6, the indicators of the recording device 11 remain unchanged, as in distilled water no charged particles. On the recording device 11 is set to zero, this indicates that the current in the measuring circuit is zero. Then, on the time relay 13, set the response time T of the contacts 12 after it is turned on. Then, water is loaded into the waiting 0.2-2.0% of the volume of water, a magnetic stirrer 4 is turned on, which rotates the magnet 5, a stirring solution, and starts the time relay 13. Upon expiration of T 60-70 s, contacts 12 are closed and the total polarization current, which depends on the activity of the cement, is recorded on the recording device 11.

At the established value of the maximum output current in the process of anodic and cathodic polarization,

Based on the obtained volt-amperograms, summing them up on the registering device can calibrate the instrument scale directly in the cement brand.

Claims (1)

Invention Formula five five 0 0 five 0 A device for determining cement activity, containing an electrolytic cell of an insulating non-magnetic material and measuring electrodes and a stirrer installed in it, a measuring unit, a generator and a recording device, characterized in that, in order to improve the accuracy of cement activity, the device is equipped with two dividers inverter, potentiometer of summation of polarization currents and zero setting, time relay, reference electrode in the form of a ring of iron and two sources of constant current connected to the generator, while the measuring electrodes are made of glass and through the voltage divider are connected respectively to the positive and negative poles of the DC sources, one output of the potentiometer of summation of polarization currents and zero setting is connected directly to one of the measuring elements, another pin is connected to another measuring electrode through an inverter, and the middle pin is connected in series through a registering device and time relay contacts connection of voltage dividers, DC sources and reference electrode.