SU1078333A1 - Plant for determination of binder contraction kinetics - Google Patents

Abstract

INSTALLATION FOR THE DETERMINATION OF THE KINETICS OF CONTRACTION OF BINDENING MATERIALS, containing an autoclave with a lid and an axial hole in it, a reaction vessel, a vessel placed in an autoclave, a heating element and a thermocouple, characterized in that. In order to improve the accuracy of determination at high temperatures and pressures, it is equipped with a chamber with a partition in the form of a piston and a measuring unit connected to a recording device, ftpfe this podpornoe part of the chamber is connected to the reaction vessel, and the overpiston to the measuring unit and the internal cavity of the autoclave ig

Description

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The invention relates to the field of studies of the physicochemical properties of a living material.

A device is known for determining the kinetics of contraction of a cement mixture comprising sealed vessels for the mixture under study and its model, a recording unit and an absolute pressure compensator l.

A device is known for recording the cement contraction process, which contains a container placed in the KaTSoaka, which, together with a variable capacitor, forms an oscillating circuit .2 ..

The lack of devices is the impossibility of determining the kinetics of contraction at high temperatures (250 ° C) and pressure (up to 100 MPa),

Closest to the invention, i is a device for determining the kinetics of contraction in the holding materials, comprising an autoclave with a lid and an axial hole in it, a reaction vessel located in the aktoclave, a heating element and a thermocouple.

The disadvantages of the known installation are the large error in measuring the magnitude of contraction, which occurs due to the determination of the volume of absorbed water by an indirect indicator — the magnitude of the pressure drop, the need for accurate calibration of the manometer, which is very difficult at the temperature above 100 ° C; directly kinetics: contraction. All this makes it impossible to obtain with a sufficient degree of reliability quantitative and qualitative estimates of the effect of contraction over time at high temperatures and pressures.

The purpose of the invention is to improve the determination accuracy at high temperatures and pressures.

The goal is achieved in that the installation for determining the kinetics of contraction in the burning materials, containing an autoclave with a lid and an axial hole in it, a reaction vessel placed in the autoclave, a heating element and a thermocouple, is equipped with a chamber with a partition in the form of a piston and a measuring unit connected to the recording device, with the podporshnev part of the chamber connected to the reaction vessel, and the nadporshnev - with the measuring node and the inside of the autoclave.

The drawing shows the installation, the overall VIDg

The installation includes an autoclave 1 with a cover 2 and an axial hole 3, a thermocouple 4, a tee 5 connected

with. high pressure valve 6 and the bottom of the chamber 7, inside of which there is a partition in the form of a piston

8 with a check valve 9 and a rod 10 rigidly attached thereto, passing through the upper tee 11 and entering the measuring sleeve 12 with a needle 13 for bleeding air, and measuring node 14 connected to the recording device 15i. The reaction vessel 16 sleeve 17 is connected to a piston part of the chamber 7. The high pressure valve b and the upper tee 11 are interconnected to each other and to the internal cavity of the autoclave by means of high pressure pipes; Position 18 shows the heating element, position 19 - the test material.

The installation works as follows.

Set the piston 8 to its highest position. The test material is poured into the reaction vessel 16, which, in order to isolate the test material from the inner cavity of the autoclave, is tightly attached to the sleeve 17, also tightly attached to the lid 2, then the autoclave 1 is sealed with a lid and, to displace air with water from the piston cavity, they open the high pressure valve b, and of the entire system as a whole - needle 13.

The presence of a check valve makes it possible for air and water to flow up through the piston. After the entire system is filled with water, the needle 13 is closed, the heating element 18 and the autoclave are turned on, and they are brought to a predetermined setting mode. The high pressure valve remains open in order to prevent the piston from moving downward under the effect of a pressure differential occurring when the pressure in the piston cavity decreases (for example, compressed air entrained in the test material when it is mixed, etc.). The high pressure open valve b makes the piston and piston cavities connected — with the internal cavity of the autoclave and, therefore, the pressure in them is the same.

After the autoclave reaches the mode (set temperature and pressure), the high pressure valve 6 is closed, while the pressure in the inner cavity of the autoclave is transferred to the hardening test material

9only a piston 8 dividing chamber 7 over the piston part and above the piston,

During the curing process of the test material (e.g., cement slurry) a contraction develops

Claims (1)

INSTALLATION FOR DETERMINING THE KINETICS OF KNITTING MATERIALS CONTRACTION, containing an autoclave with a lid · and an axial hole in it, a reaction vessel, an autoclave placed in the autoclave, a heating element and a thermocouple, characterized in that,. in order to increase the accuracy of determination at high temperatures and pressures, it is equipped with a chamber with a dividing baffle in the form of a piston and a measuring unit connected to a recording device, ρ? ι the under-piston part of the chamber is connected to the reaction vessel, and the over-piston part is connected to the measuring unit. scrap and internal cavity of the autoclave. <d *