CN206223596U - A kind of device of the plastic viscosity and yield stress for testing cement mortar - Google Patents
A kind of device of the plastic viscosity and yield stress for testing cement mortar Download PDFInfo
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- CN206223596U CN206223596U CN201621169250.9U CN201621169250U CN206223596U CN 206223596 U CN206223596 U CN 206223596U CN 201621169250 U CN201621169250 U CN 201621169250U CN 206223596 U CN206223596 U CN 206223596U
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- splicing
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- yield stress
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Abstract
The utility model discloses a kind of device of the plastic viscosity and yield stress for testing cement mortar, including cartridge, support, splicing graduated cylinder and stopwatch；Cartridge is fixed on the location mid-shaft of support vertically, and splicing graduated cylinder is placed on the underface of cartridge, and the axis coincidence of cartridge and splicing graduated cylinder, stopwatch is placed in splicing graduated cylinder periphery；The device also includes that DV, DV are located at splicing graduated cylinder periphery side；The volume of cartridge is 1000 15000ml, and top is cylindrical shape, and bottom is funnel-form；The interior diameter of cylindrical portions is with height than being 70:236, funnel part bevel altitude is 18 with the ratio between cylindric height is exported:7, the ratio between interior diameter and cylinder interior diameter of funnel exit are 15:70‑21:70.The utility model can simultaneously measure the plastic viscosity and yield stress of mortar, compared with rotation viscometer method, the method it is reproducible, test result is not influenceed by sand granular size in mortar, and compared with existing funnel method, certainty of measurement is high, time saving and energy saving.
Description
Technical field
The utility model is related to one kind for testing cement mortar rheological property device, more particularly, to one kind test cement
The plastic viscosity of mortar and the device of yield stress.
Background technology
The service behaviour of concrete mix is the general name of its denseness, plasticity and easy modified, for high-performance coagulation
For soil, should also be including Packing character, pumpability and concept etc. stability.Extensively using concrete slump and expansion in current engineering
Latitude of emulsion method characterizes the service behaviour of concrete, but concrete slump and divergence are only capable of reflecting the flowing of concrete
Property, the difference between denseness, Packing character and stability of concrete etc. can not be reflected, though this will cause the concrete having
Right mobility has reached requirement, but because its denseness is too small and cause the generation of the phenomenons such as concrete disintegration, bleeding.Cement bonded sand
Slurry is that the material after coarse aggregate is removed in concrete, and it is all comparatively close to concrete on the Nomenclature Composition and Structure of Complexes, can be indirectly
Reflect the performance of concrete.Therefore, the rheological property for comprehensively evaluating mortar turns into a kind of hand for characterizing working performance of concrete
Section.
From from the perspective of rheology, the cement mortar newly mixed belongs to Bingham liquid, and its Rheological Equations is：
In formula, τ-shear stress (Pa)；
τ0- yield stress (Pa)；
μ-plastic viscosity (Pa ﹒ s)；
- velocity gradient (s-1)。
From formula 1, the rheological curve of fresh mortar is straight line, and straight line should to surrender with the intercept of ordinate
Power, the slope of straight line is plastic viscosity.Yield stress affects easy the to be close property and mobility of mortar, and yield stress is smaller, mortar
More easy closely knit, divergence is bigger.Plastic viscosity affects the stability and mobility of mortar, and plastic viscosity is bigger, and mortar is got over
It is not easy isolation, but plastic viscosity is too big, can limit the mobility of mortar.Thus, plastic viscosity and yield stress are to characterize sand
The most basic parameter of slurry rheological property.
The now industrial mobility that mortar is determined through conventional mortar divergence method, but this method is only capable of characterizing sand
The mobile performance of slurry, so as to have ignored the stability of mortar, plasticity and from close property etc..Traditional test cement mortar rheological characteristic
The method of energy, such as rotation viscometer method, although can simultaneously determine the plastic viscosity and yield stress of mortar and precision is higher, but
Because the spacing between its inner/outer tube when slurry systems are determined only has 4.115mm, its test result is easy during rotation
Influenceed that (the accumulative screen over-size of the square hole screen of 4.75mm is 0-10% in Machine-made Sand, uses Machine-made Sand by sand granular size in mortar
When, if with the presence of the sand particle more than 4.115mm, when rotation viscometer works, coarse sand granule is easily stuck between inner/outer tube),
Often experimental result is repeatable poor.And instrument price is expensive, it is necessary to special human users.Also someone is by determining
The delivery time of mortar qualitatively characterizes the difference of the rheological parameter of mortar, but is unable to quantization signifying mortar plastic viscosity and bends
Take the stress respective difference of the two rheological parameters.
Prior art (Yang Baoxu, Peng Jie；Funnel tests the improvement [J] of mortar rheological characteristic method；Chinese building material science and technology,
2010 (2)) mortar in the funnelform container, and allow the mortar freely to let out the graduated cylinder for dropping down onto bottom, remembered with stopwatch
Record mortar often declines the time of 250ml, calculates the speed of mortar whereabouts as shear rate, and top mortar is calculated to fix unit weight
The gravity produced to it draws the rheology straight line of mortar, so as to calculate corresponding plastic viscosity and surrender as shear stress
Stress.He have studied mortar test amount (3.5L, 3L, 2.5L), mixing time (3min, 15min) and not using this device
Influence with splicing graduated cylinder internal diameter (80mm, 90mm, 100mm) to measuring accuracy, proposes when a mortar test amount is 3L, splicing
Graduated cylinder internal diameter is that 80mm and scale unit are that the mortar rheological parameter precision measured when 250ml, mixing time are 5min is maximum.
The method compares comprehensively research to mortar rheology testing device, but each mortar during the method test
Unit weight is considered as fixed value, and this has been ignored as the error introduced because unit weight is different；When such as being tested with this device once
Mortar test amount needs 3L, and the mortar test amount of method for being widely used in determining mortar divergence at present only has
800ml, that is to say, that need to expend very big manpower and materials when being measured with this device；The discharging opening mouthful of the such as device
Footpath is fixed, and when mortar mobility is different, the accuracy of the continuity of outflow and every 250ml mortars fall time record is equal
Can be affected.The method of the prior art not use DV, directly with manual time-keeping, thus require splicing cylinder scale unit be
250ml；Introduced in his paper, when test sample is less than 3L, because of measurement error, cause result discreteness stronger, test specimens
It is close when data reliability is with 3.5L when product reach 3.5L or 4.0L, to reduce experiment work amount, the authors suggested that using 3L mortars
To detect.His a diameter of 35mm of discharging opening, discharging opening diameter is bigger, and blanking is more smooth, but to ensure the accuracy of timing,
Required sample size is more, another when the good fluidity of mortar, and when viscosity is relatively low, mortar dropping velocity can be very fast, is unfavorable for
Fall time of the accurate measurement per 250ml mortars.
Utility model content
The purpose of this utility model is the problem for overcoming prior art to exist, there is provided a kind of accuracy of detection is high, time saving province
The device of the rheological property of the test cement mortar of power, specifically a kind of plastic viscosity for testing cement mortar and yield stress
Device.
To achieve the above object, the utility model is adopted the following technical scheme that：
It is a kind of test cement mortar plastic viscosity and yield stress device, including cartridge, support, splicing graduated cylinder and
Stopwatch；Cartridge is fixed on the location mid-shaft of support vertically, and splicing graduated cylinder is placed on the underface of cartridge, cartridge and splicing amount
The axis of cylinder overlaps, and stopwatch is placed in splicing graduated cylinder periphery；The device also includes that DV, DV are located at splicing graduated cylinder periphery side；Charging
The volume of cylinder is 1000-15000ml, and top is cylindrical shape, and bottom is funnel-form.
Further to realize the purpose of this utility model, it is preferable that described DV is fixed on splicing graduated cylinder level height
The position of 1/3-2/3.It is further preferred that described DV is fixed on the position of the half of splicing graduated cylinder level height.
Preferably, described support is tripod；The height of support meets the hopper outlet of cartridge apart from splicing graduated cylinder
The distance on upper edge is not less than 50mm.
Preferably, video camera of the frame per second not less than 60 frames or the photograph with camera function when described DV is recorded video
Machine.
Preferably, the cylindrical shape of described cartridge is connected or is threadedly coupled with funnel-like part integral type.
Preferably, the interior diameter of the cylindrical portions of the cartridge and height ratio are 70:236, the funnel part inclined-plane
Height is 18 with the ratio between cylindric height is exported:7；The ratio between interior diameter and cylinder interior diameter of described funnel exit are 15:
70-21:70。
Preferably, the volume of described splicing graduated cylinder is not less than 1000ml, and internal diameter is not less than 60mm.
Compared with prior art, the utility model has advantages below and beneficial effect：
(1) prior art funnel method is main with manual detection data, and precision has much room for improvement, and the utility model is with every 100ml
The time that mortar falls, as a data point, using DV recorded videos, plays back every to calculate in KM Player softwares
The time that 100ml mortars fall；In the hopper outlet size of cartridge, can be according to the difference of the mobile performance of detected mortar
Selecting different hopper outlet bores, card mortar can smoothly flow out；And substituted by the actual unit weight for determining each mortar samples
Theoretic fixed unit weight accurately calculates the gravity of mortar, used as shear stress；The utility model measuring accuracy is high.
(2) existing funnel method is needed more than or equal to 3000ml mortars, and test is wasted time and energy, the utility model cartridge
Volume is 1000-15000ml, and top is cylindrical shape, and bottom is funnel-form；The interior diameter of the cylindrical portions of cartridge compares with height
It is 70:236, funnel part bevel altitude is 18 with the ratio between cylindric height is exported:7；The interior diameter and cylinder of funnel exit
The ratio between interior diameter is 15:70-21:70.Feed opening can be adjusted according to the mobile performance of tested mortar and measuring accuracy requirement
Size.When the inner diameter of steel flue of the device is 70mm, during test, the tested number of a mortar is maintained at 1000ml, accomplish
It is time saving and energy saving.
(3) because there was only 4.115mm for measuring the spacing between the rotation viscometer of mortar its inner/outer tube, what is rotated
During its test result easily influenceed by sand granular size, the accumulative screen over-size of square hole screen of Machine-made Sand requirement 4.75mm is 0-
10%；Test result of the present utility model is not influenceed by mortar sand grains size.
(4) compared with rotation viscometer, repeatability of the present utility model is preferably.
(5) compared with the mortar rheological property detection method of existing document introduction, mortar of the utility model is small,
Use manpower and material resources sparingly；Hopper outlet bore is adjustable simultaneously, adapts to the detection needs of different rheological property mortars.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the device of the plastic viscosity and yield stress for testing cement mortar of the utility model
Figure；
Shown in figure：Cartridge 1, support 2, splicing graduated cylinder 3, DV4, stopwatch 5.
The rheological curve that Fig. 2 is obtained for data measured fitting in the utility model embodiment 1.
Specific embodiment
To more fully understand the utility model, the utility model is made further with reference to the accompanying drawings and examples
It is bright, but implementation method not limited to this of the present utility model.
As shown in figure 1, a kind of device of the plastic viscosity and yield stress for testing cement mortar, including cartridge 1, support
2nd, splicing graduated cylinder 3, DV4 and stopwatch 5；Cartridge 1 is fixed on the location mid-shaft of support 2 vertically, and splicing graduated cylinder 3 is placed on cartridge
Underface, it is ensured that the axis of cartridge and splicing graduated cylinder overlaps, stopwatch 5 is placed in the periphery of splicing graduated cylinder 3, and DV4 is located at splicing graduated cylinder 3
Periphery side；The volume of cartridge 1 is 1000-15000ml, and top is cylindrical shape, and bottom is funnel-form；Cylindrical portions it is interior straight
Footpath is with height than being 70:236, funnel part bevel altitude is 18 with the ratio between cylindric height is exported:7, funnel exit it is interior
The ratio between diameter and cylinder interior diameter are 15:70-21:70., the funnel of different outlet diameters can be processed, by screw thread and cylindrical portion
Divide connection, realize the adjustable of device blanking outlet bore.
It is preferred that DV4 is fixed on the position of the 1/3-2/3 of the level height of splicing graduated cylinder 3；Further preferred DV4 is fixed on splicing
The position of the half of the level height of graduated cylinder 3, it is ensured that DV4 can be recorded to whole graduation marks of stopwatch 5 and splicing graduated cylinder 3.
It is preferred that support 2 is tripod；The height of support 2 meets the hopper outlet (feed opening) of cartridge 1 apart from splicing amount
The distance on edge is not less than 50mm on cylinder 3.
It is preferred that video camera or camera with camera function of the frame per second not less than 60 frames when DV4 is recorded video.
It is preferred that the cylindrical shape of cartridge 1 is connected or is threadedly coupled with funnel-like part integral type；The cylindrical portions of cartridge 1
Interior diameter with height than be 70:236, funnel part bevel altitude is 18 with the ratio between cylindric height is exported:7, hopper outlet
The ratio between the interior diameter and cylinder interior diameter at place are 15:70-21:70.Replacing adjustment can be carried out according to mortar fall time, with sand
Slurry continuously can fall to being advisable.When feed opening diameter is in 15-21mm scopes.Led in order to avoid mortar flow velocity is too fast in test process
Error in reading is caused, should preferentially from the feed opening of a diameter of 15mm, if it find that when mortar flow out required from 0ml to 800ml
Between more than 7.100s when can change the feed opening of a diameter of 18mm, similarly, if it find that mortar flows out institute from 0ml to 800ml
The time T800 for needing can change the feed opening of a diameter of 21mm when being more than 6.071s, to ensure that mortar can smoothly flow out.
It is preferred that the volume of splicing graduated cylinder 3 is not less than 1000ml, and internal diameter is not less than 60mm.
During test, first, the mortar of mixing 1000mL simultaneously loads in the cartridge 1 on top, blocks hopper outlet (blanking
Mouthful).Then hopper outlet is unclamped, in allowing mortar freely to let out the splicing graduated cylinder 3 for dropping down onto bottom, whole process is recorded with DV4；
Video is played back in KM Player video jukebox softwares, the time that the mortar per 100mL falls is read, to 800mL
Untill.The foundation distance in mortar face and the Time Calculation of the reading 100mL mortars in bottom splicing graduated cylinder per 100mL mortars
The Mean Speed of whereabouts, and calculate the gravity that the mortar per 100mL mortars top is produced to it according to the mortar unit weight for measuring；
Finally, the Mean Speed for being fallen with the mortar of every 100mL as abscissa, the gravity conduct that top mortar is produced to it
Ordinate, does scatter diagram, removes first point, carries out linear fit, and the slope of the straight line is the plastic viscosity μ of mortar, cuts
Away from as yield stress τ0。
Embodiment 1
In a kind of plastic viscosity of test cement mortar and the device of yield stress that the present embodiment is selected, cartridge 1
Cylindrical portions interior diameter is 70mm, is highly 236mm, and the vertical height in pars infundibularis separated time face is 72mm, and blanking open height is
28mm, feed opening interior diameter is 15mm, and a diameter of 80mm of splicing graduated cylinder, splicing is 348mm with the height of bottom to discharging opening.Connect
The volume of doses cylinder 3 is 1000ml；DV4 frame per second is 60 frames；Stopwatch 5 can accurately read millisecond.
Testing mortar mix ratio used is：China Resources 42.5R cement 328kg/m3, iso standard sand 1336kg/m3, II grades of fine coal
Grey 164kg/m3Gram, finely ground slag (S95) 109kg/m3, polycarboxylate water-reducer 5.8kg/m3, water 282kg/m3.Mortar is surveyed
Unit weight is 2226kg/m3, test data is as shown in table 1.In order that reading is more accurate, experiment is from second 100ml mortar
Fall time starts to calculate shear rate and shear stress.
Wherein, shear stress=mortar surveys the volume of unit weight × top mortar；
I refers to i-th 100mL mortar, TiRefer to i-th fall time of 100mL mortars, 348 is feed opening distance measurements
The distance of cylinder bottom, 23 refers to the distance between 100mL scales in graduated cylinder, and unit is all mm.
The data that table 1 is determined with funnel method
With shear stress as ordinate, with shear rate as abscissa, rheological curve such as Fig. 2 institutes of mortar samples are drawn
Show, equation is obtained after linear fit：Y=19.503x+3.1906.The plastic viscosity that can obtain mortar is 19.503Pa
S, yield stress is 3.1906Pa.The relative coefficient of measured data fit curve equation reaches 0.9944, illustrates data reliability
Degree is higher.
Embodiment 2
In a kind of plastic viscosity of test cement mortar and the device of yield stress that the present embodiment is selected, cartridge 1
Cylindrical portions interior diameter is 70mm, is highly 236mm, and the vertical height in pars infundibularis separated time face is 72mm, and blanking open height is
28mm, feed opening interior diameter is 21mm, and a diameter of 80mm of splicing graduated cylinder, splicing is 348mm with the height of bottom to discharging opening.
Mortar mix ratio used is：Conch 42.5R cement 330kg/m3, the natural river sand 1330kg/m of modulus of fineness 2.63, carefully
Grinding stone limestone flour 168kg/m3Gram, finely ground slag (S95) 110kg/m3, polycarboxylate water-reducer 5.40kg/m3, water 280kg/
m3., under the same conditions with the utility model method METHOD FOR CONTINUOUS DETERMINATION 10 times, the plastic viscosity of measured mortar, yield stress mark
Quasi- difference and the coefficient of variation are shown in Table 2.
As shown in Table 2, ten assemble under equal conditions measured with funnel method than identical mortar plastic viscosity, surrender should
The standard deviation of power is respectively 0.411 and 0.3887, and the coefficient of variation is respectively 0.0166 and 0.1298, standard deviation and variation lines
Number is smaller, illustrates with the favorable repeatability of funnel method.
Ten groups of plastic viscosities and yield stress of mortar in the embodiment 2 of table 2
Claims (8)
1. a kind of device of the plastic viscosity and yield stress for testing cement mortar, including cartridge, support, splicing graduated cylinder and second
Table；Cartridge is fixed on the location mid-shaft of support vertically, and splicing graduated cylinder is placed on the underface of cartridge, cartridge and splicing graduated cylinder
Axis overlap, stopwatch is placed in splicing graduated cylinder periphery；It is characterized in that the device also includes that DV, DV are located at splicing graduated cylinder outer Monday
Side；The volume of cartridge is 1000-15000ml, and top is cylindrical shape, and bottom is funnel-form.
2. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The DV for stating is fixed on the position of the 1/3-2/3 of splicing graduated cylinder level height.
3. it is according to claim 2 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The DV for stating is fixed on the position of the half of splicing graduated cylinder level height, and ensures that DV can be recorded to the complete of stopwatch and splicing graduated cylinder
Portion's graduation mark.
4. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The support stated is tripod；The height of support meets the hopper outlet of the cartridge distance on edge on splicing graduated cylinder and is not less than
50mm。
5. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
Video camera or camera with camera function of the frame per second not less than 60 frames when the DV for stating is recorded video.
6. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The cylindrical shape of the cartridge stated is connected or is threadedly coupled with funnel-like part integral type.
7. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The interior diameter and height ratio for stating the cylindrical portions of cartridge are 70:236, the funnel part bevel altitude and the cylindric height of outlet
The ratio between degree is 18:7；The ratio between interior diameter and cylinder interior diameter of described funnel exit are 15:70-21:70.
8. it is according to claim 1 test cement mortar plastic viscosity and yield stress device, it is characterised in that institute
The volume of the splicing graduated cylinder stated is not less than 1000ml, and internal diameter is not less than 60mm.
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| CN201621169250.9U CN206223596U (en) | 2016-11-02 | 2016-11-02 | A kind of device of the plastic viscosity and yield stress for testing cement mortar |
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| CN201621169250.9U CN206223596U (en) | 2016-11-02 | 2016-11-02 | A kind of device of the plastic viscosity and yield stress for testing cement mortar |
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| CN109001078B (en) * | 2018-06-12 | 2021-02-09 | 北京城建道桥建设集团有限公司 | Method for establishing constitutive relation of II-type cement-based grouting material |
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| CN108956381A (en) * | 2018-08-01 | 2018-12-07 | 中南大学 | A kind of concrete dynamic and static rheological performance test methods |
| CN109684783A (en) * | 2019-02-26 | 2019-04-26 | 重庆交通大学 | A kind of MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE method based on mortar rheological behavior |
| CN109684783B (en) * | 2019-02-26 | 2023-02-24 | 重庆交通大学 | Self-compacting concrete mix proportion design method based on mortar rheological property |
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