CN104316437A - Plunger type testing apparatus and test method for extrusion rheological property - Google Patents
Plunger type testing apparatus and test method for extrusion rheological property Download PDFInfo
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- CN104316437A CN104316437A CN201410546957.6A CN201410546957A CN104316437A CN 104316437 A CN104316437 A CN 104316437A CN 201410546957 A CN201410546957 A CN 201410546957A CN 104316437 A CN104316437 A CN 104316437A
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- extrusion
- rheological property
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Abstract
The invention discloses a plunger type testing apparatus for extrusion rheological property. The plunger type testing apparatus comprises a dowel bar, a sample barrel, a plunger, an upper bearing platform, an extruding die orifice, a bearing stand column and a lower bearing platform, wherein the extruding die orifice is mounted in a prefabricated trepan boring in the center of the upper bearing platform in a sleeving manner. The invention further discloses a test method for extrusion rheological property which fits test data by adopting six-parameter Benbow nonlinear equation. The test method can test the rheological property of the high-viscosity slurry material which can not be tested by the existing rheometer, and thus a feasible method for characterizing the extrusion rheological property of the cement-based slurry material is provided.
Description
Technical field
The present invention relates to test unit and test method that test cement based paste materials extrudes rheological property, particularly a kind of plunger type extrudes rheological property test unit and test method.
Background technology
Extruding rheological property is the important parameter describing paste materials mechanical behavior in extrusion, is extruding-out process theoretical foundation in actual applications.Extruding rheological property is can extrude the bullet of slurry, glue, to mould etc. the sign of comprehensive mechanical property, and in view of the special nature of cement based paste materials, existing rheometer test device all can not be directly applied for the test that cement based paste materials extrudes rheological property.
At present, extruding the test unit of rheological property for evaluating slurry, being mainly homemade plunger type extrusion test device, utilize Benbow equation model to calculate correlation parameter to what evaluate paste materials and extrude rheological property.But there is the problem of following several respects in plunger type extrusion device: the die orifice of similar plunger type extrusion device uses bolt to connect, the limited and poor stability of bearing capacity; Die orifice only has variable-length, but internal diameter is immutable; Mold shape is single, and that can not carry out difformity mould entrance extrudes rheology testing; Only utilize Benbow linear equation (four parameters), but linear equation is only suitable for Newtonian fluid, and ignores the shear thinning characteristic that most of paste materials obviously shows in extrusion, cause fitting result to differ larger with actual; Usually adopt intercept-Slope Method to carry out the calculating of correlation parameter to the utilization of Benbow equation, its computation process is more complicated, and the reliability of result is poor.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art with not enough, a kind of plunger type is the object of the present invention is to provide to extrude rheological property test unit, it can pass through transmission rod adhesion loading system, carry out extruding rheology property test, realize rheology testing to paste materials, what adopt apparatus of the present invention effectively can evaluate cement based paste materials extrudes rheological property.
Another object of the present invention is to provide the test method extruding rheological property test unit based on above-mentioned plunger type, adopt Benbow nonlinear equation (six parameters), make test result closer to truth, and simplify testing process, the process using equation model to calculate is optimized.
Object of the present invention is achieved through the following technical solutions:
Plunger type extrudes rheological property test unit, comprise transmission rod, sample bucket, plunger, upper carrying platform, extrusion mould-outlet, carrying column, lower carrying platform, described upper carrying platform and lower carrying platform parallel to each other, upper carrying platform by carrying upright supports above lower carrying platform; Described sample bucket is fixed on upper carrying platform in bolt mode; Described extrusion mould-outlet is installed in the prefabricated trepanning at upper carrying platform center in the mode that sleeve is inserted in; Sample bucket is consistent with extrusion mould-outlet central shaft, and transmission rod top is connected with variable-ratio force loading system, and transmission rod bottom and plunger are fixedly linked.
Described sample bucket inner bottom part is provided with cone angle pad, and described cone angle pad is ring-type, and lower surface is surface level, and upper surface is the conical surface.
Described transmission rod bottom is connected in bolt mode with plunger.
The plunger type that described plunger type extrudes rheological property test unit extrudes rheological property test method, comprises the following steps:
(1) sample bucket and extrusion mould-outlet are installed, record the diameter of now sample bucket, extrusion mould-outlet length, extrusion mould-outlet diameter;
(2) be encased in sample bucket by paste materials to be measured, then opening force loading system is extruded, and by programmed control rate of extrusion, after pressure level-off to be extruded, record is when the extrusion pressure corresponding to time test;
(3) change rate of extrusion, repeat step (2) repeatedly;
(4) change extrusion mould-outlet, repeat step (1) ~ (3) repeatedly;
(5) test data that step (1) ~ (4) are recorded to brought into and substitute into Benbow nonlinear equation, to characterizing paste materials and extrude the initial yield stress of rheological property, yield stress factor of influence, yield stress nonlinear exponent, initial shearing stress, shear stress factor of influence, shear stress nonlinear exponent adopt Benbow nonlinear equation to carry out the Fitting Calculation;
Described Benbow nonlinear equation is as follows:
In formula,
P
tot-extrude total pressure;
σ
0-initial yield stress;
α-yield stress factor of influence;
N-yield stress nonlinear exponent
τ
0-initial shearing stress;
β-shear stress factor of influence;
M-shear stress nonlinear exponent;
V-rate of extrusion;
L-extrusion mould-outlet length;
D-extrusion mould-outlet diameter;
D
0-sample bucket diameter.
Also comprise in described step (4) and change cone angle pad.
Compared with prior art, the present invention has the following advantages and beneficial effect:
Plunger type of the present invention extrudes rheological property test unit, achieves structure optimization, is convenient to change accessory, and reliability is also improved, and can carry out the test of various shape extrusion; Plunger type of the present invention extrudes rheological property test method, simplifies computation process, its fitting result and actual test result compatible degree higher, the true character of tested slurry can be reacted.
Accompanying drawing explanation
Fig. 1 is the structural representation that the plunger type of embodiments of the invention extrudes rheological property test unit.
Fig. 2 is the schematic diagram of the vertebra angle pad of embodiments of the invention.
Fig. 3 is the schematic diagram of the extrusion mould-outlet of embodiments of the invention.
Fig. 4 is the measured data of embodiments of the invention and the curve map of fitting data.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment
As shown in Figure 1, the plunger type of the present embodiment extrudes rheological property test unit, comprise transmission rod 1, sample bucket 2, plunger 3, upper carrying platform 5, extrusion mould-outlet 6, carrying column 7, lower carrying platform 8, described upper carrying platform 5 and lower carrying platform 8 parallel to each other, upper carrying platform 5 is supported on the top of lower carrying platform 8 by carrying column 7; Described sample bucket 2 is fixed on upper carrying platform 5 in bolt mode; The mode that described extrusion mould-outlet 6 is inserted in sleeve is installed in the prefabricated trepanning at upper carrying platform 5 center in the mode that sleeve is inserted in; Sample bucket 2 is consistent with extrusion mould-outlet 6 central shaft, and transmission rod 1 top is connected with variable-ratio force loading system, and transmission rod 1 bottom is connected in bolt mode with plunger 3.
According to test needs, sample bucket 2 inner bottom part can arrange cone angle pad 4.As shown in Figure 2, described cone angle pad 4 is ring-type, and lower surface is surface level, and upper surface is the conical surface.As shown in Figure 1, the xsect of cone angle pad 4 is two triangles.
The extrusion mould-outlet of the present embodiment as shown in Figure 3.
Described vertebra angle pad 4 and extrusion mould-outlet 6 all comprise sizes.
The plunger type of the present embodiment extrudes rheological property test method, comprises the following steps:
(1) select accessory (extrusion mould-outlet and cone angle pad), installation fitting according to the requirement of test, rheological property proving installation will be extruded and assemble complete, and record the diameter of now sample bucket, extrusion mould-outlet length, extrusion mould-outlet diameter;
(2) be encased in sample bucket by paste materials to be measured, then opening force loading system is extruded, and by programmed control rate of extrusion, after pressure level-off to be extruded, record is when the extrusion pressure corresponding to time test; Required rate of extrusion should be completed in single extrusion test, to reduce the error because environment or human factor cause as far as possible;
(3) change rate of extrusion, repeat step (2) repeatedly;
(4) change accessory, repeat step (1) ~ (3) repeatedly;
(5) test data that step (1) ~ (4) are recorded to brought into and substitute into Benbow nonlinear equation, to characterizing paste materials and extrude the initial yield stress of rheological property, yield stress factor of influence, yield stress nonlinear exponent, initial shearing stress, shear stress factor of influence, shear stress nonlinear exponent adopt Benbow nonlinear equation to carry out the Fitting Calculation;
Described Benbow nonlinear equation is as follows:
In formula,
P
tot-extrude total pressure (kPa)
σ
0-initial yield stress (kPa)
α-yield stress factor of influence [(kPasmm
-1)
n]
N-yield stress nonlinear exponent
τ
0-initial shearing stress (kPa)
β-shear stress factor of influence [(kPasmm
-1)
m]
M-shear stress nonlinear exponent
V-rate of extrusion (mm/s)
L-extrusion mould-outlet length (mm)
D-extrusion mould-outlet diameter (mm)
D
0-sample bucket diameter (mm)
L, D, D in formula
0for die size, determine according to selected accessory; P
totby extrude test calculated data, its computation process such as formula shown in (2), wherein F be survey extrude power;
V is the flowing velocity of paste materials in extrusion mould-outlet, its computation process such as formula shown in (3), wherein V
efor the speed that plunger declines, i.e. the loading velocity of programmed control force loading system;
The process need of the Fitting Calculation applies to Matlab or similar functions software, utilizes least square method to determine to differ minimum fitted data with actual value.
Extrude rheological property for characterizing same paste materials, at least should test and extrude situation, i.e. at least twice extrusion test under 2 length-diameter ratio extrusion mould-outlets, under each extrusion mould-outlet, test is no less than the extrusion pressure of 4 rates of extrusion.Actual tests data are more, and the accuracy of matching is also higher.In the present embodiment, first assembling length-diameter ratio is 2.7 extrusion mould-outlets, test is extruded to cement based slurry to be measured, continuous transformation rate of extrusion in test process, tests 0.45mm/s, 0.89mm/s, 1.78mm/s, 3.56mm/s, 7.12mm/s, 14.25mm/s, 28.50mm/s totally 7 rates of extrusion in order; Rate of extrusion first with 3.56mm/s when extruding carries out pre-extruded, and speed change of being allowed for access after pressure stability to be extruded testing procedure, the test duration of each rate of extrusion is no less than 1min.After single is extruded and is completed, change the extrusion mould-outlet to length-diameter ratio 10.67, again carry out extruding test, step is the same.Test acquired results is as shown in table 1.
Bring test the data obtained into Benbow nonlinear equation, each group length-diameter ratio-rate of extrusion-extrusion pressure data can obtain an equation, amount to 14 equations, then Matlab software is utilized to calculate, use least square method to seek optimal function coupling, the Fitting Calculation result is as shown in table 2.Use Benbow nonlinear equation the Fitting Calculation result and measured data to have very high compatible degree, Fig. 4 is that the measured data in the present embodiment compares with fitting data.
Table 1 test result (P
tot, unit K pa)
Table 2 the Fitting Calculation result
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. plunger type extrudes rheological property test unit, it is characterized in that, comprise transmission rod (1), sample bucket (2), plunger (3), upper carrying platform (5), extrusion mould-outlet (6), carrying column (7), lower carrying platform (8), described upper carrying platform (5) and lower carrying platform (8) parallel to each other, upper carrying platform (5) is supported on the top of lower carrying platform (8) by carrying column (7); Described sample bucket (2) is fixed on upper carrying platform (5) in bolt mode; Described extrusion mould-outlet (6) is installed in the prefabricated trepanning at upper carrying platform (5) center in the mode that sleeve is inserted in; Sample bucket (2) is consistent with extrusion mould-outlet (6) central shaft, and transmission rod (1) top is connected with variable-ratio force loading system, and transmission rod (1) bottom and plunger (3) are fixedly linked.
2. plunger type according to claim 1 extrudes rheological property test unit, it is characterized in that, described sample bucket (2) inner bottom part is provided with cone angle pad (4), and described cone angle pad (4) is ring-type, lower surface is surface level, and upper surface is the conical surface.
3. plunger type according to claim 1 extrudes rheological property test unit, it is characterized in that, described transmission rod (1) bottom is connected in bolt mode with plunger (3).
4. the plunger type extruding rheological property test unit based on the plunger type described in any one of claims 1 to 3 extrudes rheological property test method, it is characterized in that, comprises the following steps:
(1) sample bucket and extrusion mould-outlet are installed, record the diameter of now sample bucket, extrusion mould-outlet length, extrusion mould-outlet diameter;
(2) be encased in sample bucket by paste materials to be measured, then opening force loading system is extruded, and by programmed control rate of extrusion, after pressure level-off to be extruded, record is when the extrusion pressure corresponding to time test;
(3) change rate of extrusion, repeat step (2) repeatedly;
(4) change extrusion mould-outlet, repeat step (1) ~ (3) repeatedly;
(5) test data that step (1) ~ (4) are recorded to brought into and substitute into Benbow nonlinear equation, to characterizing paste materials and extrude the initial yield stress of rheological property, yield stress factor of influence, yield stress nonlinear exponent, initial shearing stress, shear stress factor of influence, shear stress nonlinear exponent adopt Benbow nonlinear equation to carry out the Fitting Calculation;
Described Benbow nonlinear equation is as follows:
In formula,
P
tot-extrude total pressure;
σ
0-initial yield stress;
α-yield stress factor of influence;
N-yield stress nonlinear exponent
τ
0-initial shearing stress;
β-shear stress factor of influence;
M-shear stress nonlinear exponent;
V-rate of extrusion;
L-extrusion mould-outlet length;
D-extrusion mould-outlet diameter;
D
0-sample bucket diameter.
5. plunger type according to claim 4 extrudes rheological property test method, it is characterized in that, also comprises and change cone angle pad in described step (4).
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Cited By (3)
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| CN108519307A (en) * | 2018-05-03 | 2018-09-11 | 江苏新嘉理生态环境材料股份有限公司 | A kind of device of architectural terra-cotta (ATC) test pug rheological characteristic |
| CN111366494A (en) * | 2020-04-01 | 2020-07-03 | 中国建筑第八工程局有限公司 | Rheological property testing method of building 3D printing material |
| CN114166691A (en) * | 2021-11-30 | 2022-03-11 | 中建西部建设湖南有限公司 | Method and device for testing rheological property of cementing material |
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Cited By (4)
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| CN108519307A (en) * | 2018-05-03 | 2018-09-11 | 江苏新嘉理生态环境材料股份有限公司 | A kind of device of architectural terra-cotta (ATC) test pug rheological characteristic |
| CN111366494A (en) * | 2020-04-01 | 2020-07-03 | 中国建筑第八工程局有限公司 | Rheological property testing method of building 3D printing material |
| CN114166691A (en) * | 2021-11-30 | 2022-03-11 | 中建西部建设湖南有限公司 | Method and device for testing rheological property of cementing material |
| CN114166691B (en) * | 2021-11-30 | 2023-07-14 | 中建西部建设湖南有限公司 | Method and device for testing rheological property of cementing material |
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Application publication date: 20150128 |