(from Greek. Thixis - touch and trope - turn, change * thixotropy of rocks; n. Thixotropie der Gesteine; f. Thixotropie des Roches; and. Capacidad Tixotropica de Rocas, TIXTROPIA de Rocas) - Physico-chemical phenomenon In some colloidal dispersed systems, for example, in coherent rocks, and consisting in their spontaneous discharge under the influence of mechanical impact (shaking, stirring, vibration, ultrasound, etc.) and the subsequent restoration of the structure while eliminating these effects. Thixotropy is explained by the reversible structural links between the mineral particles of the coherent breed. With a certain mechanical exposure, there is a transition of associated and immobilized water into the free, which leads to a decrease in the strength of structural bonds and the dilution of the rock. The cessation of exposure leads to the reverse transition of water from free into the associated condition and strengthening rock (thixotropic hardening).
An indicator characterizing the tendency of rocks to thixotropic softening is pura. It is customary to measure the average radius of the base of the cylindrical sample (mm) after its vibration at a frequency of 67 Hz and amplitude of 1 mm. The initial radius of the sample is 8 mm, and the height of the cylinder is 20 mm. The magnitude of the indicator of the ziyobility varies from 8-9 for noncuserotropic rocks up to 15 or more for high-balanceotropic rocks. A more general indicator is the limit of structural strength under dynamic exposure, defined as an extreme alternate acceleration, in which the strength of the rock is not reduced. It is measured in m / s 2. Thickotropic hardening is characterized by the recovery time (C), during which the maximum strength of the breed is achieved during recovery.
Thixotropy is determined by the qualitative and quantitative composition of their dispersed phase, the particle form and their hydrophilicity, composition and concentration of pore moisture, etc. The basic effect has a granulometric composition of the rock. Thickotropic phenomena are characteristic of rocks with the content of clay particles of at least 1.5-2%.
Thixotropy is widespread in nature and has both negative and positive effect on technological processes in the development of wet connected rocks. For example, when transporting such rocks, thixotropic discharge causes their intensive adhesion to the working surfaces of the transport equipment, reducing its capacity by 1.5 times. On the other hand, thixotropy is used when drilling drilling work, piles. Thixotropy - the cause of landslide phenomena.
Thixotropy. (thixotropy) (from Greek. θίξις - Touch I. τροπή - Change) - the ability of the substance to reduce the viscosity (diluted) from mechanical impact and increase the viscosity (thicken) at rest.
Thixotropic fluids
Thickotropia should not be confused with pseudoplasty. In pseudoplastic fluids viscosity decreases with increasing shift voltageWhile in thixotropic fluids viscosity decreases with time with constant shift voltage.
Thixotropic fluids are fluids in which at a constant deformation rate, the shear voltage decreases in time.
The viscosity of some liquids under constant ambient conditions and shift rates varies with time. If the viscosity of the fluid is reduced over time, the liquid is called thixotropic, if it increases - reopec.
Both behaviors may occur both with the above-described types of fluids, and only at certain shift speeds. The time interval can vary greatly for different substances: some materials achieve a constant value in seconds, others in a few days. Reopecable materials are quite rare, in contrast to thixotropic, which include lubricants, viscous prints, paints.
Thixotropic liquid
Thixotropic fluids (from Greek. θίξισ - Touch I. τροπέ - change) - liquids in which at a constant deformation rate, the shift voltage decreases in time.
The viscosity of some liquids under constant ambient conditions and shift rates varies with time. If the viscosity of the fluid is reduced over time, the liquid is called thixotropic, and if, on the contrary, it increases, then reopecnet.
Both behaviors may occur both with the above-described types of fluids, and only at certain shift speeds. The time interval can vary greatly for different substances: some materials achieve a constant value in seconds, others in a few days. Reopecable materials are quite rare, in contrast to thixotropic, which include lubricants, viscous prints, paints.
When studying the influence of two parameters (time and shear rate) on the viscosity of materials for thixotropic liquids, the following curves will be obtained. [ specify]
The descending and ascending curves do not coincide and form a "hysteresis loop", which is caused by a decrease in the viscosity of the fluid during prolonged deformations. This phenomenon can be reversible or not: some systems can gain initial viscosity after resting period, other systems - never.
see also
Thixotropy
Rock rocks (from Greek. Thixis - Touch and Trope - Rotate, change * a. Thixotropy of Rocks; n. Thixotropie der Gesteine; f. Thixotropie des Roches; and. capacidad Tixotropica de Rocas, TIXTROPIA de Rocas) - physico-chemical. The phenomenon occurs in some colloidal dispersed systems, for example. In the connected G. p., and consisting in their spontaneous discharge under the influence of mechanical. Impact (shaking, stirring, vibration, ultrasound, etc.) and subsequent restoration of the structure while eliminating these effects. T. is due to a reversible decompression of structural links between the mineral particles of the coherent breed. With a certain mechanical. The effects of associated and immobilized water in free, which leads to a decrease in the strength of structural bonds and the dilution of the breed. The cessation of exposure leads to the reverse transition of water from free into the associated condition and strengthening rock (thixotropic hardening).
An indicator that characterizes the tendency of G. p. To thixotropic softening, is a zybacity. It is customary to measure the average radius of the base of cylindrich. Sample (mm) after its vibration at a frequency of oscillations of 67 Hz and amplitude of 1 mm. The initial radius of the sample is 8 mm, and the height of the cylinder is 20 mm. The magnitude of the indicator of the ziyobility varies from 8-9 for noncuserotropic rocks up to 15 or more for high-balanceotropic rocks. A more general indicator is the limit of structural strength at dynamic. The impact, defined as the limit alternate acceleration, does not decrease with the rock. It is measured in M \u200b\u200b/ C2. Thickotropic hardening is characterized by the recovery time (C), max during the restoration is achieved by Max. Breed strength.
T. defined qualities. and quantities. The composition of their disperse phase, the form of particles and their hydrophilicity, composition and concentration of pore moisture, etc. The influence has granulometrics. The composition of the breed. Thickotropic phenomena are characteristic of rocks with the content of clay particles of at least 1.5-2%.
T. Widespread in nature and has it to be denied. And put it. Influence on tehnol. Processes in the development of wet connected rocks. For example, when transporting such rocks, thixotropic thinning causes the intensive adhesion to the working surfaces of the TRAC. Equipment, reducing its performance by 1.5 times. With others. Parties, T. are used when driving drilling work, piles. That is the cause of landsverable phenomena. A. V. Dugartsyrenov.
Mountain Encyclopedia. - M.: Soviet Encyclopedia. Edited by E. A. Kozlovsky. 1984-1991 .
Synonyms:Watch what is "thixotropy" in other dictionaries:
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Thixotropy - - the ability of paint to reduce the viscosity (diluted) from mechanical exposure and increase the viscosity (trough) at rest ... Current dictionary
thixotropy - Property of some materials of glue, latex, etc. Restore its structure destroyed by mechanical influence [Terminological dictionary on construction in 12 languages \u200b\u200b(VNIIIS USSR Gosstroy)] EN Thixotropy de Thixotropie FR Thixotropie ...
thixotropy - 3.5 thixotropy: the ability of the solution to thicken in peace, forming a centener mass of gel and diluted with mechanical exposure, turning into a viscous sol. The process can repeat repeatedly. A source …
Property of certain materials of glue, latex and others. Restore its structure destroyed by mechanical effects (Bulgarian; Bulgarian) thixotrophinost (Czech language; Čeština) Thixotropie; TIXOTROPIE (German; Deutsch) ... ... Construction Dictionary
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thixotropy soil - The ability of some soils and soils in the converted state to acquire fluidity under the influence of mechanical effects (when shaking, stirring) and move again into a solid state at rest ... Dictionary on geography
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Thixotropy.
Thixotropy.
The ability of some dispersed systems is reversibly diluted with sufficiently intensive mechanical. The impacts (stirring, shaking) and harden (lose) when staying alone. T.- The characteristic property of coagulats. The structures, which can be destroyed by an unlimited number of times, and each time their properties are completely restored. Examples of typical thixotropic structures can serve as systems formed by coagulation of aqueous colloidal dispersions of iron hydroxide, aluminum hydroxide, pentoxide vanadium, bentonite suspensions, kaolin.
Mechanical The properties of thixotropic structures are characterized by the values \u200b\u200bof three parameters (P. A. Rebelder): the greatest eff. Viscosity H 0 of a practically non-destructive structure, the smallest eff. Viscosity H. M. extremely destroyed structure and limit shift voltage P. 0 .
Dependence Eff. Viscosity H from the applied shift voltage P. can be described by ur
For small values P.not disturbing peace or causing a very slow flow, the structure has the properties of a solid body, since its reduction under these conditions exceeds the rate of destruction. For R>> R 0 The system turns out to be extremely destroyed and is a small viscosity H M.. Value P. 0 characterizes a non-destructive structure. The process of restoring the destroyed structure in peace can be characterized by increasing time strength.
In some cases, the application is small P. and deformation with low speed accelerate the increase in strength and structuring of dispersed systems; This is the phenomenon of Naz. R e o p e to s and e. Sometimes concentrated dispersed systems (pastes) are detected by the increase in H with an increase in the deformation rate, accompanied by a certain increase in the volume occupied by the system: when deformed solid particles form a more loose frame and the existing liquid medium turns out to be Not enough to provide the system.
T. Dispersed systems has great practical. value. Consistency lubricants, paint materials, ceramic should be posted with thixotropic properties. Mass, washing, used during drilling wells, MN. Food products. I. H. Vlodais.
Physical encyclopedia. In 5 volumes. - M.: Soviet Encyclopedia. Editor-in-Chief A. M. Prokhorov. 1988 .
Synonyms:
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It is necessary to transfer the contents of the article by the thixotropic fluid to this article and put redirection from there. You can help the project by combining articles (CM. Instructions for combining). If necessary, discussion of expediency ... ... Wikipedia