Test device and method for characterizing coagulation characteristics of foam fluid by lost flow time

Abstract

The invention discloses a test apparatus for characterizing the condensation characteristic of a foam fluid by a loss flow time, and a method thereof. The apparatus comprises a test rack and a measurement container; the test rack comprises a baseboard, the baseboard is vertically fixedly provided with two supporting plates, two support plates are vertical to each other and are fixedly arranged on the baseboard through the two supporting plates, and four corners of the baseboard are respectively provided with a leveling screw and a leveling nut; and the measurement container is a cuboid, the upper end of the measurement container is opened, the middle portion of the wall of the measurement container is engraved with an initial line, and a connecting line from the bottom end of one vertical edge of one side surface of the measurement container to the upper portion of another vertical edge is adopted as a horizontal line. The invention also provides a method using the apparatus to test the loss flow time of a foam fluid to be tested, and steps thereof. The condensation time of the tested foam fluid, which is the loss flow time, can be obtained by adopting the apparatus and the method. The test apparatus has the advantages of simple structure and ingenious conception, and the test method has the advantages of simple operation and result accuracy.

Description

technical field [0001] The invention belongs to a test device and method for the coagulation characteristic of foam fluid, in particular to a test device and method for characterizing the coagulation characteristic of foam fluid by using lost flow time. Background technique [0002] Foam fluid has good fracture seepage and upward accumulation characteristics and has excellent heat insulation ability after solidification, so it has become the main technical means for preventing coal spontaneous combustion in mines and coal fields in the future. Because the seepage and diffusion form and range of cement-based foam fluid largely depend on its setting characteristics, and the pouring volume and pouring range in cast-in-place construction also depend on its setting time, so the setting characteristics of cement-based foam fluid are The most important factor to consider. But for cement-based foam fluid, there are very few studies on the determination method of its setting time. ...

AI Technical Summary

Problems solved by technology

However, for cement-based foam fluids, there are very few studies on the determination of its setting time.

For example, the "Experimental Research on the Setting Time of Foamed Concrete" proposed by domestic scholar Fan Lilong mainly focuses on the influence of the amount of foaming agent on the setting time. The setting time is measured using the method of measuring the setting time of concrete, namely the penetration resistance method. The method of determining the setting time of cement using the initial setting needle and final setting needle of the Vicat instrument provided in the national cement standard GB / T1346-2011 is not suitable for porous and heterogeneous foam fluids, because when the test needle penetrates into the foam fluid When it is in the material, it will pass through the foam space and the liquid film on the hole wall, and the foam space is air, and the resistance to the penetrating needle is basically zero, resulting in errors in the measurement data

The industry standard JG / T 266-2011 of foam concrete only provides the consistency standard of foam concrete, and does not give the standard for the determination of setting time.

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