SU1245973A1 - Differential positive dilatometer - Google Patents

Abstract

This invention relates to a measurement technique. Its purpose is to simplify the measurement process and increase its accuracy. It is reached by a hem that the differential volumetric dilatometer with a working and reference cell with measuring capillaries and filling capillaries is additionally provided with a cross bar with a scale and an index rigidly fixed between two blocks through which the cable is connected, a pull with a counterweight connected with the cross bar The measuring capillaries are provided with pistons connected to the ends of the cable, and the cable is provided with a lead fixed to it, the latter being designed to make electrical contact with the index. 2 Il. with (L tc 4 cl () with

Description

The invention relates to a measurement technique, and more specifically to devices for researching materials by the method of low-temperature dilatometry in order to assess their frost resistance.

The purpose of the invention is to simplify the measurement process and improve the accuracy

Fig. 1 depicts strain curves — temperature for dry, wet concrete samples} in Fig. 2 is a schematic diagram of the proposed device.

 The dilatometer (Fig. 2) has a reference 1 and 2 working cells with measuring capillaries 3 and 4 and capillaries 5 and 6 of the filling. Measuring capillaries 3 and 4 are equipped with pistons 7 and 8, which are connected} with a cable 9, thrown over blocks 10, mounted on the ends of the traverse 11. The second 12 traverse 11 is connected to the counterweight 13. On the cable 9, the leash is strengthened 14 and on the scale of the traverse 11 a movable index 15 is set. A dry sample is placed in the reference cell, and a working sample 2 filled with the working fluid is placed in working cell 2. The capillaries 5 and 6 of the filling end with the taps 16, to which funnels (not shown) are connected to fill the vessels 1 and 2. The lead 14 and index 15 form an electrical contact in the signaling circuit. During operation, a dilatometer is placed under a refrigerated chamber (not shown). The device also contains an external detector 17.

Dilatometer works as follows.

Equal in volume samples of respectively dehydrated and moistened material are placed into the reference 1 and working 2 cells, and they are poured into the reference 1 and the working 2 cells through the capillaries 5 and 6. Pistons 7 and 8 are inserted into measuring capillaries 3 and 4 so that in the tensioned state of cable 9, the leash 14 is connected with index 15, initially set at zero division, cal c; obverse 11. Cranes 16 overlap the capillaries 5 and 6 of the filling, thereby jointly sealing the cells. Place the device in the refrigerating chamber and pump the contact lead - index into the circuit of the external alarm device 17.

With a decrease in the temperature of the system and the samples in the section OM of the graph (Fig. 1), the pistons are synchronously lowered in the measuring capillaries 3 and 4,

which causes the descendants 11 to lower while maintaining the tension of the cable 9 under the action of the counterweight 13, and the lead 14 does not change. Its position relative to the scale of the yoke 11 and its contact with the slider 15 is not disturbed. On the plot of the plot, the pistol 7 continues to move evenly downward, and the piston 8 due to anomalous expansion

the moistened sample rises.

This causes a change in the speed of the vertical movement of the crosspiece 11 and a shift of the driver 14 to the right along its scale with a slider 15.

the curve through the point M of the piston, 8 begins to descend again, which causes the acceleration of the movement of the crosspiece 11 downwards and the gap of contact between the driver 14 and the index 15. The signal

the light goes out, indicating. Accessibility of temperature T, Displacement of the index 15 from the zero of the scale Traverse 11 indicates the magnitude of the peak A, which characterizes the cold resistance of the material.

nouie read index 15 again returns to the zero scale of traverse 11 (manually or, for example, using an electromagnet),

and on the 3rd part of the N, N test schedule, repeat as described.

The presence of the pistons of the cable traverse with a counterweight ensures the fixation of the required parameters (temperatures T and T, and a T of A and A) c. help1) a leash, an index and a signal element with a cryocamera thermometer (not shown).

The proposed design of the dilatometer eliminates the need for uninterrupted measurements, which, with the known methods of assessing the frost resistance of materials, are unnecessary and unnecessarily complicate the research process. With all its simplicity, the dilatometer's design allows compensation of all temperature errors and does not require the use of special sensors measurement schemes and ensures at the same time, sufficient accuracy of the analysis results.

Formula

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3

gaining

Differential volumetric dilatometer, containing a working and reference cell with measuring capillaries, filling capillaries and a temperature measuring circuit, is similar to that, in order to simplify the process, to measure and improve its accuracy, it is additionally equipped crosshead with scale and index4 .1 / 4i I

1

1245973

a catfish rigidly fixed between two blocks through which a cable is passed, tight with a counterweight connected to the crosshead, and measure the capillary tubes equipped with pistons connected to the ends of the cable, and the rope is fitted with a tightly fixed on it. Designed with the possibility of electrical contact during measurements with the index.

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Editor N. Yatsola

Compiled by A.Platova

Tehred I.Popovich Proofreader I.Musk.

Order 3992/36 Edition 778 Subscription

VNIRSHI State Committee of the USSR

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (1)

Claim Differential volumetric dilatometer ,. containing a working and reference cell with measuring capillaries, filling capillaries and a temperature measurement circuit, the only reason is that, in order to simplify the measurement process and increase its accuracy, a som is rigidly fixed between the two blocks through which a cable, a traction with a counterweight associated with the traverse, and the measuring capillaries are equipped with pistons connected to the ends of the cable, and the cable is equipped with a leash fixed to it, while the latter is made with the possibility of electrical contact measurement th with indone additionally in the course