CN108426802A - The device of rheological parameters of fresh mixed concrete is predicted by slump test process - Google Patents
The device of rheological parameters of fresh mixed concrete is predicted by slump test process Download PDFInfo
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- CN108426802A CN108426802A CN201810265367.4A CN201810265367A CN108426802A CN 108426802 A CN108426802 A CN 108426802A CN 201810265367 A CN201810265367 A CN 201810265367A CN 108426802 A CN108426802 A CN 108426802A
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- G—PHYSICS
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- 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
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Abstract
The invention discloses a kind of devices for predicting rheological parameters of fresh mixed concrete by slump test process, including slump cone, source of parallel light tablet, scale tablet, the first video camera, the second video camera and bottom plate；Bottom plate is equipped with concentric circles graduation mark, and slump cone is set to bottom plate center, and the axle center of slump cone is overlapped with the center of circle of concentric circles on bottom plate；Source of parallel light tablet is oppositely arranged on the side of bottom plate with the scale tablet, and source of parallel light tablet is equipped with parallel array light source, and scale tablet is equipped with horizontal scale line；First video camera is fixed on above parallel array light source, and for shooting the horizontal scale line on the scale tablet of opposite, the second video camera is fixed on right over the bottom plate center of circle, for shooting the concentric circles graduation mark on bottom plate；Slump cone therefrom can split into two parts by axial plane, become slump cone after two parts combination.Device using the present invention not only simplifies rheological parameters of fresh mixed concrete test process, and reduces testing cost.
Description
Technical field
The present invention relates to a kind of RC axial loading column tools, more particularly to a kind of to be predicted newly by slump test process
The device of mixed concrete rheological parameter.
Background technology
The rheological parameter of fresh concrete is to judge the important parameter of fresh concrete working performance quality.In order to more intuitive
More accurately measure the flow behavior of the rheological property and research fresh concrete of fresh concrete, in the past 20 years, scholars
Have developed the rheometers of a variety of different geometries, different configuration, different applicable elements.
Rheometer can relatively accurately measure the rheological parameter of fresh concrete, but mostly not portable enough, very heavy,
It is difficult to be unfolded to test at the construction field (site), and rheometer is generally more costly, is complicated for operation, it is more demanding to tester, it increases
The difficulty of rheometer is used in engineering site.On the other hand, the rheological property of concrete is by match ratio, temperature, humidity, mix
The influence of the factors such as technique and time, if being transported after mixing plant measurement to construction site, the rheology ginseng of fresh concrete
Number can change, and great difficulty is brought to concrete Quality Control.
Slump experiment is the common infrastest in construction site, and easy to operate, device is flexibly portable, is wanted to external environment
Ask not high, the measurement for fresh concrete workability is a kind of more ripe effective method, still, with additive, is blended
A large amount of uses of material, the simple slump or divergence test cannot reflect working performance of concrete comprehensively, need to measure coagulation
The working performance of the energetic reflection fresh concrete of rheological parameter ability of soil.
Therefore it provides a kind of cost is relatively low, Simple portable is suitble to measure rheological parameters of fresh mixed concrete at the construction field (site)
Device is of great significance.
Invention content
In view of this, the embodiment of the present invention provides one kind predicting rheological parameters of fresh mixed concrete by slump test process
Device, main purpose is simplified rheological parameters of fresh mixed concrete test process, reduce testing cost.
In order to achieve the above objectives, present invention generally provides following technical solutions：
A kind of device for predicting rheological parameters of fresh mixed concrete by slump test process, including it is slump cone, parallel
Light source tablet, scale tablet, the first video camera, the second video camera and bottom plate；
The bottom plate is equipped with concentric circles graduation mark, and the slump cone is set to bottom plate center, the slump
The axle center of cylinder is overlapped with the center of circle of concentric circles on the bottom plate；
The source of parallel light tablet is oppositely arranged on the side of the bottom plate with the scale tablet, and the source of parallel light is flat
Plate is equipped with parallel array light source, and the scale tablet is equipped with horizontal scale line；
First video camera is fixed on above parallel array light source, for shooting the horizontal scale on the scale tablet of opposite
Line, second video camera is fixed on right over the bottom plate center of circle, for shooting the concentric circles graduation mark on bottom plate；
The slump cone therefrom can split into two parts by axial plane, become slump cone after two parts combination.
The scale tablet is equipped with equidistant horizontal scale line, minimum scale value 0, and minimum scale line exists with the bottom plate
In same level, the scale division value of maximum scale value 30cm, horizontal scale line are 1cm.
The source of parallel light tablet and the scale tablet are rectangular flat, two pieces of rectangular flats long 1m, wide 0.35m.
The bottom plate is parallel to horizontal plane placement, and horizontal parallel array light source, institute are equipped in the source of parallel light tablet
The visible light that parallel array light source is stated for emission level is parallel with the bottom plate.
The bottom plate is the square plate of 1*1m, and the center of concentric circles is square the center of tablet, the concentric circles
Least radius be 100mm, maximum radius 500mm, the radius of the concentric circles is poor equal-difference arrangement with 10mm.
Two pieces of rectangular flats are arranged perpendicular to bottom plate.
The parallel array light source often shows 35 light sources along 5 row of width direction arrangement of the source of parallel light tablet
It is equally spaced, in the both sides of the parallel array light source of the first row, respectively distribution two arranges parallel array light source, adjacent, parallel dot matrix
The centre-to-centre spacing of light source is 20mm.
The advantageous effect that technical solution provided in an embodiment of the present invention is brought is：
Device using the present invention not only simplifies rheological parameters of fresh mixed concrete and surveys on the basis of ensureing prediction accuracy
Examination process, and testing cost can be reduced.
Description of the drawings
Fig. 1 is the structural schematic diagram of slump test device provided in an embodiment of the present invention；
Fig. 2 is the graduation mark schematic diagram provided in an embodiment of the present invention that slump height is read on two vertical plates；
Fig. 3 is the concentric circles graduation mark schematic diagram provided in an embodiment of the present invention that slump radius is read on bottom plate；
Fig. 4 is the partial enlarged view of Fig. 3；
Fig. 5 is the distribution schematic diagram of parallel array light source provided in an embodiment of the present invention；
Fig. 6 is the yield value of stress compares figure that the yield value of stress being calculated with the present apparatus is measured with rheometer；
Fig. 7 is the viscosity number compares figure that the viscosity number being calculated with the present apparatus is measured with rheometer.
In figure：
The first video cameras of 1-, the second video cameras of 2-, 3- slump cones, 4- source of parallel light tablets, 5- scale tablets, the bottoms 6-
Plate, 7- concrete.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Referring to Fig. 1 to Fig. 5, a kind of device for predicting rheological parameters of fresh mixed concrete by slump test process collapses
Fall test device, including slump cone 3, source of parallel light tablet 4, scale tablet 5, the first video camera 1, the second video camera 2 and bottom
Plate 6；
Bottom plate 6 is equipped with concentric circles graduation mark, and slump cone 3 is set to 6 center of bottom plate, the axle center of slump cone 3
It is overlapped with the center of circle of concentric circles on bottom plate 6；
Source of parallel light tablet 4 is oppositely arranged on the side of bottom plate 6 with scale tablet 5, and source of parallel light tablet 4 is equipped with parallel
Array light source, scale tablet 5 are equipped with horizontal scale line；
First video camera 1 is fixed on above parallel array light source, for shooting the horizontal scale on opposite scale tablet 5
Line, the second video camera 2 is fixed on right over 6 center of circle of bottom plate, for shooting the concentric circles graduation mark on bottom plate 6；
Slump cone 3 therefrom can split into two parts by axial plane, become slump cone 3, slump cone 3 after two parts combination
It is interior to be used to place concrete seven.
Referring to Fig. 2, in the present embodiment, scale tablet 2 is equipped with equidistant horizontal scale line, minimum scale value 0, and minimum is carved
Line is spent with the bottom plate in same level, and the scale division value of maximum scale value 30cm, horizontal scale line are 1cm.
Referring to Fig. 1, in the present embodiment, source of parallel light tablet 4 and scale tablet 5 are rectangular flat, two pieces of rectangular flats
Long 1m, wide 0.35m.
In the present embodiment, bottom plate 6 is parallel to horizontal plane placement, and horizontal parallel array light is equipped in source of parallel light tablet 4
Source, visible light of the parallel array light source for emission level are parallel with bottom plate 6.
Referring to Fig. 3 and Fig. 4, in the present embodiment, bottom plate is the square plate of 1*1m, and the center of concentric circles is square flat
The center of plate, the least radius of the concentric circles are 100mm, maximum radius 500mm, and the radius of the concentric circles is with 10mm
Equal-difference arrangement.
Referring to Fig. 1, in the present embodiment, two pieces of rectangular flats are arranged perpendicular to bottom plate 6.
Referring to Fig. 5, parallel array light source 8 often shows 35 light along 5 row of width direction arrangement of source of parallel light tablet 4
Source is equally spaced, and the central axis of the parallel array light source of first row 9 is Chong Die with the axis of source of parallel light tablet 4, i.e. first row
The distance a of the central axis of parallel array light source 9 to 4 side of source of parallel light tablet is 500mm, in the parallel array light source of first row
Respectively distribution two arranges parallel array light source for 9 both sides, and the centre-to-centre spacing b of adjacent, parallel array light source 8 is 20mm.
Illustrate the test process of the present invention below by a specific embodiment：
Embodiment 1
The test process of device to test rheological parameter using the present invention is：
(1) square floor is positioned on horizontal plane；
(2) vertical rectangular flat, long side and the square of vertical rectangular flat are fixed on the opposite both sides of square floor
The side fitting alignment of bottom plate, is allowed to keep vertical with square floor；
(3) two halves of combination slump cone are placed at a complete slump cone and just put shape bottom plate center, make detachable
The axle center of slump cone is overlapped with square floor center；
(4) parallel array light source, the first video camera and the second video camera are opened；
(5) fresh concrete is perfused into complete detachable slump cone；
(6) two halves of detachable slump cone are detached to both sides simultaneously, concrete starts to collapse；
The process that concrete height and radius change over time under (7) first video cameras and the second camera record, then divide
Frame reads the height and radius value at each moment.
(8) height and radius value such as the following table 1 at each moment are read.
Table 1
(9) it is based below it is assumed that calculating rheological parameter：
Highly, the derivation of the relational expression of radius and time and rheological parameter is based on two hypothesis：First, fresh concrete
Slump process be it is axisymmetric, can will be on problem reduction to two dimensional surface；Second is that radial shear rate is much larger than axial shearing speed
Rate, then inside concrete shear rate may be regarded as the speed difference of adjacent two layers horizontal plane.Pressure can be in radial graded
It is approximately variable gradient of the shearing force in axial direction, is based on following two formula,
Pressure wherein inside concrete any point is generated by the gravity of upper layer concrete, i.e.,
P=ρ g (h (r)-z)
The rheological property of material is described with bingham model：
τ=τ0+μγ
(1a) (1b) two formulas are got in z=0~h (r) range inner products
Wherein,
Because of h (r=0)=H, h (r=R)=0
Therefore formula (2) are integrated：
I.e.：
In z=0 planes,
Finally obtain accounting equation：
The height recorded in table 1, radius are screened, take out radial variations rate be more than height change rate 5 again with
On point, and will accordingly height, radius, time numerical value substitute into, obtain a curve, withFor abscissa,Curve matching is in line for ordinate, then the intercept acquired i.e. yield stress, slope is plastic viscosity.Wherein p is
Pressure, ρ are density, and g is acceleration of gravity, and r indicates radial,Z indicates axial, and R is extension radius, R0For initial radium, H is mixed
Height after solidifying soil collapses, h (r) are the height for extending concrete when radius is r, and t is slump time, and τ is shear stress, τ0It is in the wrong
Stress is taken, μ is viscosity, and γ is shear rate.
Preferably, fresh concrete is big chutable concrete, and the slump should be at least up to 180mm, and bright during slump
It is aobvious that isolation and aggregate packing phenomenon does not occur.
Preferably, the first video camera and the second camera record collapse and highly should be less than with the time interval of radius value
0.5s。
Comparative example
The concrete of 5 groups of difference rheological properties is taken newly to mix coagulation by the description repetitive operation in embodiment 1, and by same group
Soil is carried out testing to obtain rheological parameter with CONTEC5 rheometers, then the rheological parameter measured with the device of the invention is compared.
Fig. 6 is that yield value of stress is calculated in device using the present invention and rheometer measures yield value of stress compares figure,
WhereinFor the yield value of stress being calculated with the device of the invention,For the yield value of stress that rheometer measures,
Equation is the linear function of fitting, variances of the Adj.R-Square between data point and fitting a straight line.
Fig. 7 is that viscosity number is calculated in device using the present invention and rheometer measures viscosity number compares figure, wherein μcalFor
The viscosity number being calculated with the device of the invention, μexFor the viscosity number that rheometer measures, Equation is the linear letter of fitting
Number, variances of the Adj.R-Square between data point and fitting a straight line.
Referring to Fig. 6 and Fig. 7, abscissa be rheometer measure as a result, ordinate is that the present apparatus measures as a result, straight line is
Fitting as a result, the comparing result of wherein yield stress and viscosity is as follows.
It is found by comparison, the rheological parameters of fresh mixed concrete measured in the embodiment of the present invention is flowed with existing CONTEC5
Become the data that instrument measures and compare proportional relationship, variance is smaller, and wherein the variance of yield stress is 0.911, and the variance of viscosity is
0.983, substantially meet accuracy requirement.Device through the invention described above is on the basis of ensureing prediction accuracy, no
Only simplify rheological parameters of fresh mixed concrete test process, and testing cost can be reduced.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. a kind of device for predicting rheological parameters of fresh mixed concrete by slump test process, which is characterized in that including collapsing
Spend cylinder, source of parallel light tablet, scale tablet, the first video camera, the second video camera and bottom plate；
The bottom plate is equipped with concentric circles graduation mark, and the slump cone is set to bottom plate center, the slump cone
Axle center is overlapped with the center of circle of concentric circles on the bottom plate；
The source of parallel light tablet and the scale tablet are oppositely arranged on the side of the bottom plate, on the source of parallel light tablet
Equipped with parallel array light source, the scale tablet is equipped with horizontal scale line；
First video camera is fixed on above parallel array light source, for shooting the horizontal scale line on the scale tablet of opposite,
Second video camera is fixed on right over the bottom plate center of circle, for shooting the concentric circles graduation mark on bottom plate；
The slump cone can therefrom axial plane be split into two, become slump cone after two parts combination.
2. the apparatus according to claim 1, which is characterized in that the scale tablet is equipped with equidistant horizontal scale line, most
Down scale value is 0, and minimum scale line and the bottom plate are in same level, maximum scale value 30cm, horizontal scale line
Scale division value is 1cm.
3. device according to claim 1 or 2, which is characterized in that the source of parallel light tablet and the scale tablet are equal
For rectangular flat, two pieces of rectangular flats long 1m, wide 0.35m.
4. device according to claim 3, which is characterized in that the bottom plate is parallel to horizontal plane placement, the directional light
Horizontal parallel array light source, visible light and the bottom plate of the parallel array light source for emission level are equipped in the tablet of source
It is parallel.
5. device according to claim 4, which is characterized in that the bottom plate is the square plate of 1*1m, concentric circles
Center is square the center of tablet, and the least radius of the concentric circles is 100mm, maximum radius 500mm, the concentric circles
Radius with 10mm be poor equal-difference arrangement.
6. device according to claim 5, which is characterized in that two pieces of rectangular flats are arranged perpendicular to bottom plate.
7. device according to claim 6, which is characterized in that the parallel array light source is along the source of parallel light tablet
Width direction equidistantly press row arrangement, the axis of the central axis of the parallel array light source of first row and the source of parallel light tablet
Overlapping is distributed other in the both sides of the parallel array light source of the first row and arranges parallel array light source.
8. device according to claim 7, which is characterized in that the parallel array light source is along the source of parallel light tablet
5 row of width direction arrangement, often show 35 light sources and be equally spaced, each point of the both sides of the parallel array light source of the first row
Cloth two arranges parallel array light source, and the centre-to-centre spacing of adjacent, parallel array light source is 20mm.
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| CN111307664A (en) * | 2020-03-09 | 2020-06-19 | 西安建筑科技大学 | Method for dynamically measuring and representing cement paste viscosity by using expansion degree |
| CN111426601A (en) * | 2020-04-16 | 2020-07-17 | 华南理工大学 | Single-person-achievable self-compacting concrete performance testing system and testing method |
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