CN108982297A - A kind of test method of pump concrete lubricant layer rheological property - Google Patents
A kind of test method of pump concrete lubricant layer rheological property Download PDFInfo
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- CN108982297A CN108982297A CN201810860117.5A CN201810860117A CN108982297A CN 108982297 A CN108982297 A CN 108982297A CN 201810860117 A CN201810860117 A CN 201810860117A CN 108982297 A CN108982297 A CN 108982297A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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Abstract
The invention discloses a kind of test methods of pump concrete lubricant layer rheological property, including once-through method and twice method, once-through method is that pyramid type rotor is inserted into concrete 150mm, concrete is sheared by ten stepped shear rates of successively decreasing, the mean value of torque stationary value under each shear rate is taken to be fitted calculating, obtained fitting parameter is used to calculate the yield stress of lubricant layer, by assuming that lubricant layer can calculate the viscosity of lubricant layer with a thickness of 2-9mm；Rotor by being inserted into concrete 50 and 150mm by secondary method respectively, ten stepped shear rates of successively decreasing shear concrete, the difference of torque stationary value under the identical shear rate of test depth twice is taken to be fitted calculating, influence to avoid rotor tip concrete turbulent flow to rotor torque, obtained fitting parameter is used to calculate the yield stress of lubricant layer, by assuming that lubricant layer can calculate the viscosity of lubricant layer with a thickness of 2-9mm.
Description
Technical field:
The present invention relates to concrete NDT field, specially a kind of test method of pump concrete lubricant layer rheological property.
Background technique:
Since the U.S. in 1933 transports concrete using the mode of pumping for the first time, pumping has become mainly applying for modern concrete
Work mode.Effect of the concrete pumping technique in infrastructure construction in china becomes more and more important, on the one hand, China's ready-mixed concrete
Yield in 2015 is up to 18.34 billion cubic meters, and most ready-mixed concrete are transported to construction by way of pumping
Position is poured, and the pumping technology of concrete directly affects the construction quality of concrete works.In pumping procedure, concrete
The lubricant layer that layer is formed between pump line, greatly reduces resistance of the concrete in pumping procedure.Even there is some grind
Study carefully personnel and thinks that pumpability of concrete is only related with the performance of lubricant layer, and it is unrelated with the performance of concrete itself.Generally
Concrete is thought in pump line in flow process, and pumping pressure and pipe friction power collective effect form inside concrete not
Uniformly shearing field, maximum value of the shearing force from pipeline and material interface are decreased to the center point along pipe radius dimension linear
Zero, and the heterogeneity of concrete determines that aggregate can be migrated from shearing force larger part to smaller part, so that boundary slurry amount
Higher than main body concrete, and then form lubricant layer.Foreign study personnel propose certain methods to test the rheological characteristic of lubricant layer
Energy.But it cannot accurately obtain the rheological parameter of concrete lubricant layer.
So how to design a kind of test method of pump concrete lubricant layer rheological property, becoming us will currently be solved
Certainly the problem of.
Summary of the invention:
The purpose of the present invention is in view of the drawbacks of the prior art, provide a kind of test side of pump concrete lubricant layer rheological property
Method, to solve the problems, such as that above-mentioned background technique proposes.
To achieve the above object, the invention provides the following technical scheme: a kind of pump concrete lubricant layer rheological property
Test method, pump concrete lubricant layer rheological characteristic test method are as follows:
Concrete: being put into concrete rheometer by step 1 first, is answered by the complete dynamic concrete surrender of cross rotor measurement
Power and viscosity；
Step 2: and then cross rotor is changed to pyramid type rotor, then once-through method or twice method are used by pyramid type rotor
Test lubricant layer, once-through method be will test rotor submergence concrete sample 150mm the corresponding torque-rotation speed of position measurement it is bent
Line；Method is to test corresponding T-N curve when rotor being submerged the concrete sample position 50mm and 150mm respectively twice, wherein turning round
Square is the torque difference that different submergences are tested twice；
Step 3: will do corresponding inspection to each revolving speed and calculate, then the calculating parameter needed by linear fit, final logical
The calculation formula for crossing lubricant layer calculates the yield stress of frictional layer
Step 4: by assuming that the viscosity of lubricant layer can be calculated with a thickness of any value in 2-9mm for lubricant layer.
As a preferred technical solution of the present invention, the range of speeds of the pyramid type rotor: 0-60r/min, revolving speed
Precision: 0.01r/min；Import torque sensor on the rheometer, torque range: 0-50nm, torque precision: 0.015nm.
As a preferred technical solution of the present invention, the once-through method quick and convenient can obtain concrete lubricant layer rheology
Performance, the method twice are to avoid rotor tip concrete turbulent flow to the shadow of rotor torque by testing the method subtracted each other twice
It rings, with more acurrate acquisition concrete rheological parameter.
As a preferred technical solution of the present invention, the rheometer divides using coaxial cylinders method, dual-use
Not She You cross rotor and pyramid type rotor, the cross rotor application in measurement the static and dynamic rheological characteristic of concrete
On energy；The pyramid type rotor application measurement is on pump concrete frictional layer rheological property.
As a preferred technical solution of the present invention, the lubrication of the concrete in the lubricant layer rheological characteristic test method
Layer refers to that concrete forms one layer of millimetre-sized lubricant layer in pumping procedure at duct wall, and the presence of lubricant layer substantially reduces
Pumping resistance, and the performance of lubricant layer determines the pumping resistance of concrete, lubricant layer performance includes yield stress and viscosity
Constant.
Beneficial effect is: the test method of pump concrete lubricant layer rheological property of the present invention, this method can detecte pump
The yield stress and viscosity of frictional layer on concrete lubricant layer are sent, and is measured using coaxial cylinders method and cross rotor mixed
Solidifying soil rheological property, the rheological property of frictional layer is measured by cylindrical rotor, and primary put can be used and be quickly obtained concrete
Lubricant layer performance can also avoid rotor tip concrete turbulent flow to the shadow of rotor torque using the method subtracted each other is tested twice
It rings, with the more acurrate rheological parameter for obtaining concrete lubricant layer.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below, so that advantages and features of the invention can be easier to by this
Field personnel understanding, so as to make a clearer definition of the protection scope of the present invention.
The present invention provides a kind of technical solution: a kind of test method of pump concrete lubricant layer rheological property, and pumping is mixed
Solidifying soil lubricant layer rheological characteristic test method are as follows:
Concrete: being put into concrete rheometer by step 1 first, is answered by the complete dynamic concrete surrender of cross rotor measurement
Power and viscosity；
Step 2: and then cross rotor is changed to pyramid type rotor, then once-through method or twice method are used by pyramid type rotor
Test lubricant layer, once-through method be will test rotor submergence concrete sample 150mm the corresponding torque-rotation speed of position measurement it is bent
Line；Method is to test corresponding T-N curve when rotor being submerged the concrete sample position 50mm and 150mm respectively twice, wherein turning round
Square is the torque difference that different submergences are tested twice；
Step 3: will do corresponding inspection to each revolving speed and calculate, then the calculating parameter needed by linear fit, final logical
The calculation formula for crossing lubricant layer calculates the yield stress of frictional layer
Step 4: by assuming that the viscosity of lubricant layer can be calculated with a thickness of any value in 2-9mm for lubricant layer.
The range of speeds of pyramid type rotor: 0-60r/min, rotary speed precision: 0.01r/min；Import torque on rheometer
Sensor, torque range: 0-50nm, torque precision: 0.015nm.Method is avoided by testing the method subtracted each other twice twice
Influence of the rotor tip concrete turbulent flow to rotor torque, with more acurrate acquisition concrete rheological parameter.Rheometer using
Coaxial cylinders method, dual-use are respectively equipped with cross rotor and pyramid type rotor, and cross rotor application is in measurement concrete
On static and dynamic rheological property；Pyramid type rotor application is measured on pump concrete frictional layer rheological property.Lubricant layer
The lubricant layer of concrete in rheological characteristic test method refers to that concrete forms one layer of millimeter in pumping procedure at duct wall
The lubricant layer of grade, the presence of lubricant layer greatly reduces pumping resistance, and the performance of lubricant layer determines the pumping resistance of concrete
Power, lubricant layer performance include yield stress and viscosity constant.
Beneficial effect is: the test method of this kind of pump concrete lubricant layer rheological property, this method can detecte pumping
The yield stress and viscosity of frictional layer on concrete lubricant layer, and coagulation is measured using coaxial cylinders method and cross rotor
Native rheological property measures the rheological property of frictional layer by cylindrical rotor, and primary put can be used and be quickly obtained concrete profit
Slip layer performance can also avoid rotor tip concrete turbulent flow to the shadow of rotor torque using the method subtracted each other is tested twice
It rings, with the more acurrate rheological parameter for obtaining concrete lubricant layer.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Claims (5)
1. a kind of test method of pump concrete lubricant layer rheological property, it is characterised in that: pump concrete lubricant layer rheology
Property test method are as follows:
Concrete: being put into concrete rheometer by step 1 first, is answered by the complete dynamic concrete surrender of cross rotor measurement
Power and viscosity；
Step 2: and then cross rotor is changed to pyramid type rotor, then once-through method or twice method are used by pyramid type rotor
Test lubricant layer, once-through method be will test rotor submergence concrete sample 150mm the corresponding torque-rotation speed of position measurement it is bent
Line；Method is to test corresponding T-N curve when rotor being submerged the concrete sample position 50mm and 150mm respectively twice, wherein turning round
Square is the torque difference that different submergences are tested twice；
Step 3: will do corresponding inspection to each revolving speed and calculate, then the calculating parameter needed by linear fit, final logical
The calculation formula for crossing lubricant layer calculates the yield stress of frictional layer；
Step 4: by assuming that the viscosity of lubricant layer can be calculated with a thickness of any value in 2-9mm for lubricant layer.
2. a kind of test method of pump concrete lubricant layer rheological property according to claim 1, which is characterized in that institute
The range of speeds of pyramid type rotor: 0-60r/min is stated, rotary speed precision: 0.01r/min；Import torque on the rheometer passes
Sensor, torque range: 0-50nm, torque precision: 0.015nm.
3. a kind of test method of pump concrete lubricant layer rheological property according to claim 1, which is characterized in that institute
Stating once-through method quick and convenient can obtain concrete lubricant layer rheological property, and the method twice is by testing the method subtracted each other twice
Influence of the rotor tip concrete turbulent flow to rotor torque is avoided, with more acurrate acquisition concrete rheological parameter.
4. a kind of test method of pump concrete lubricant layer rheological property according to claim 1, which is characterized in that institute
Rheometer is stated using coaxial cylinders method, dual-use is respectively equipped with cross rotor and pyramid type rotor, described cross
Rotor application is on the measurement static and dynamic rheological property of concrete；The pyramid type rotor application measurement is in pump concrete
On frictional layer rheological property.
5. a kind of test method of pump concrete lubricant layer rheological property according to claim 1, which is characterized in that institute
The lubricant layer for stating the concrete in lubricant layer rheological characteristic test method refers to that concrete is formed at duct wall in pumping procedure
One layer of millimetre-sized lubricant layer, the presence of lubricant layer greatly reduces pumping resistance, and the performance of lubricant layer determines concrete
Pumping resistance, lubricant layer performance includes yield stress and viscosity constant.
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| CN201810860117.5A CN108982297A (en) | 2018-08-01 | 2018-08-01 | A kind of test method of pump concrete lubricant layer rheological property |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304809A (en) * | 2020-10-26 | 2021-02-02 | 中南大学 | Concrete rheological property testing method based on coaxial cylinder rheometer |
| CN114689826A (en) * | 2020-12-31 | 2022-07-01 | 江苏苏博特新材料股份有限公司 | Rheology evaluation method for phase stability of interior of ultrahigh-performance concrete |
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| JP2014066680A (en) * | 2012-09-27 | 2014-04-17 | Dic Corp | Reaction solution viscosity detection method and apparatus, and reaction solution generation device |
| CN106840968A (en) * | 2017-01-20 | 2017-06-13 | 河海大学 | The on-line Full method of testing of rheological parameters of fresh mixed concrete |
| CN206583755U (en) * | 2017-03-31 | 2017-10-24 | 北京市中超混凝土有限责任公司 | Concrete rheometer with cleaning device |
| CN206638554U (en) * | 2017-03-31 | 2017-11-14 | 北京市中超混凝土有限责任公司 | A kind of concrete rheometer of more measurement heads |
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2018
- 2018-08-01 CN CN201810860117.5A patent/CN108982297A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014066680A (en) * | 2012-09-27 | 2014-04-17 | Dic Corp | Reaction solution viscosity detection method and apparatus, and reaction solution generation device |
| CN106840968A (en) * | 2017-01-20 | 2017-06-13 | 河海大学 | The on-line Full method of testing of rheological parameters of fresh mixed concrete |
| CN206583755U (en) * | 2017-03-31 | 2017-10-24 | 北京市中超混凝土有限责任公司 | Concrete rheometer with cleaning device |
| CN206638554U (en) * | 2017-03-31 | 2017-11-14 | 北京市中超混凝土有限责任公司 | A kind of concrete rheometer of more measurement heads |
Non-Patent Citations (2)
| Title |
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| SEUNG HEE KOWN等: "Prediction of concrete pumping: PartⅠ—Development of new tribometer for analysis of lubricating layer", 《ACI MATERIALS JOURNAL》 * |
| 赵筠: "泵送混凝土易泵性试验评价方法的研究进展", 《混凝土世界》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112304809A (en) * | 2020-10-26 | 2021-02-02 | 中南大学 | Concrete rheological property testing method based on coaxial cylinder rheometer |
| CN114689826A (en) * | 2020-12-31 | 2022-07-01 | 江苏苏博特新材料股份有限公司 | Rheology evaluation method for phase stability of interior of ultrahigh-performance concrete |
| CN114689826B (en) * | 2020-12-31 | 2023-08-08 | 江苏苏博特新材料股份有限公司 | Rheology evaluation method for phase stability of ultra-high performance concrete interior |
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Application publication date: 20181211 |