SU78092A1 - Instrument for determining the porosity of materials - Google Patents

Description

The invention relates to the determination of the nopHcroiCTH of various materials by suctioning air or gases from the sample under vacuum.

The device described below allows the pores to be filled with LIQUID at varying pressures raised against atmospheric, and to obtain more complete porosity characteristics: determine the pore sizes and their volumes, the average hydraulic radius of the pore space and the effective specific surface of the pores.

FIG. 1 to 4 show the structure of the device.

The device is made of a glass burette filled with mercury to the zero point of the scale on the glass tube at position a (in Fig. 2).

The glass tube connecting the two vessels of the burette is supplied with a volume scale from 0 to 5 cm. In the buret billing position, when the glass stopper / is open, mercury is poured into the opposite vessel that communicates with the atmosphere of the inner tube. In this position of the burette, a piece of rock with a volume of up to 5 cm is placed in an open vessel and closed with a stopper. In the position the burette is placed in a hermetic glass cylinder 2 and is closed with devices 3 and 4 with a rubber gasket 5.

To protect the burette from mechanical damage over the burette and under it, there is a shear on the gasket 6. The spring 7, pressing the body of the burette 9 against the cork / by means of the part 5 and the gasket 6, balances the pressure of mercury on the cork in position a and thus ensures reliable closure of the burette.

The glass cylinder 2, hermetically sealed with a nut 10 with a rubber gasket 5, is provided with a safety steel casing with a longitudinal notch to observe the burette scale. A pressure gauge with a pressure gauge of up to 30 ar is attached to the casing to monitor the pressure inside the glass cylinder.

The device with the burette in position b is mounted on a tripod, as shown in FIG. 3; open the stopper J2; A vacuum pump is connected to the outlet for pumping out the air in the pores of the test sample. After the air is pumped out, the plug 2 is closed, the vacuum pump is turned off, the device is turned

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180 and mounted on a tripod in the position shown in FIG. 4 The total volume of the test specimen is noted for the height of the mercury column.

In these positions, a wire from a compressed air cylinder is connected to the device, the plug 2 is opened and the pressure valve needle slowly increases the pressure in the cylinder until the moment of shift of the mercury slider 11.

The subsequent addition of air is carried out in small portions and with exposure. IJO until the steady state position of the mercury column in the burette and pressure on the manometer.

In the steady state, the readings of the manometer R and the readings of the buret A V "are recorded; thus, the dependence curve is taken:

(P},

Where:

tL is the volume of mercury pressed into the sample pores.

This curve is the basis for a complete analysis of the pore space of the sample.

Subject invention

Claims (4)

I. For determining the porosity of the mother: alov by extracting air from the pores of the entire traceable sample under vacuum, and then saturating them with a liquid using a burette graduated in units of volume, so that in order to determine, along with the determination of the total porosity of the sample, the size and the relative volume of pores having a different radius (hydraulic), an instrument burette, having a volume scale and installed in a hermetically sealed glass tube, equipped with a pressure gauge and a three-way valve for connecting the burette after evacuating the sample. under vacuum to the compressed air tank so that along the curve - mh - - F (P) (P-readings of the manometer, A F - counting by; buretzhe and t / g is the volume of mercury pressed into the pores) obtained as a result of internal pressure of the burette at various pressures; space. 2. The form of the device according to claim 1, characterized in that the burette, in order to realize the possibility of a tworote 180 ° relative to the working position when sucking air, is made removable and equipped at one end with a DOM1 vessel with a ground plug that serves to accommodate sample, and on the other compensation vessel. 3. In the apparatus of claim 1, use of an elastic locking mechanism consisting of a spring and two elastic gaskets and serving to enable the burette to be installed inside a hermetically sealed glass tube without damage. 4. In the apparatus of claim I, use a protective metal cylindrical tube cover provided with a window for observing the burette readings.