CN108896442B - Testing device and measuring method for horizontal flow performance of concrete - Google Patents
Testing device and measuring method for horizontal flow performance of concrete Download PDFInfo
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- CN108896442B CN108896442B CN201810710403.3A CN201810710403A CN108896442B CN 108896442 B CN108896442 B CN 108896442B CN 201810710403 A CN201810710403 A CN 201810710403A CN 108896442 B CN108896442 B CN 108896442B
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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
- G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
- G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
- G01N11/06—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by timing the outflow of a known quantity
Abstract
The invention provides a device and a method for testing the horizontal flow performance of concrete, which can solve the problems that the existing concrete working performance testing method is single in measurement parameter, the relation among all working performance parameters is not tight, the horizontal flow performance of the concrete and the barrier passing capability cannot be integrally represented, and the like. The device comprises a square bottom groove with rivets uniformly distributed in the bottom groove and a conical funnel with the same volume as the bottom groove, wherein a conical leak hole is arranged right above the bottom groove. The invention can measure the horizontal flow performance and the barrier passing capacity of the concrete.
Description
Technical Field
The invention relates to a measuring device and a measuring method, in particular to a measuring device and a measuring method for horizontal flow performance of concrete.
Background
The measurement of the horizontal flow performance of the concrete is mainly measured by slump, expansion, T500 and other test parameters measured by a slump test, and the mutual relation among the test parameters is less, so that the horizontal flow performance of the concrete and the barrier passing capacity of the concrete cannot be expressed integrally. The concrete flow performance is closely related to the flow time, only the V-shaped funnel test is used for testing the relation between the concrete work performance and the flow time at present, but the V-shaped funnel is easily affected by concrete segregation, the tested value has high randomness, the relation with the slump test is not close, and the relation between the concrete horizontal flow performance and the flow time cannot be expressed uniformly.
Disclosure of Invention
The invention provides a device for testing the horizontal flow performance of concrete and an implementation method thereof, aiming at solving the problems that the existing concrete flow performance test has single parameter for measuring the concrete flow performance, the correlation among the parameters is not tight, and the horizontal flow performance and the obstacle crossing capability of the concrete cannot be comprehensively expressed.
The technical scheme adopted by the invention for solving the problems is as follows: the device comprises a bottom plate, side baffles, rivets, a conical funnel, a funnel switch and a funnel handle, wherein the rivets are uniformly distributed on the upper surface of the bottom plate, and the bottom plate and the side baffles form a bottom groove for measuring the horizontal flow performance of concrete.
The bottom plate of the invention is a square with the size of 600mm multiplied by 600 mm; the side baffle is a rectangle with the size of 200mm multiplied by 600 mm; the diameter of each rivet is 10mm, the height of each rivet is 180mm, and the distance between every two adjacent rivets is 100 mm; the distance between the side baffle and the adjacent rivet is 100 mm; the diameter of the upper end opening of the conical funnel is 500mm, the diameter of the lower end outlet is 100mm, the height of the cone is 660mm, and the height of the cylinder with the lower diameter of 100mm is 55 mm.
The concrete steps for measuring the horizontal flow performance of the concrete are as follows:
filling concrete into the conical funnel, placing the conical funnel at a position 300mm above the bottom groove, opening a switch of the conical funnel, and calculating the outflow time t of the concrete from the conical funnel.
Step two, measuring the height of the concrete at the center position in the bottom groove, near the side baffle and near each rivet, and calculating to obtain a variance according to the height of each measuring point:
in the formula: x is the number of1、x2…x25The height values of the concrete of 25 measuring points in the bottom groove are obtained;
the height of 25 measuring points in the concrete in the bottom groove is the average value.
From the measurement result, the variance S is calculated2And the outflow time t into a calculation model of the horizontal fluidity evaluation index P:
P＝2/3·S2+1/3·t
when the horizontal fluidity evaluation index is more than 0 and less than or equal to 10, the horizontal fluidity of the concrete is better; when the horizontal fluidity evaluation index is more than 10 and less than or equal to 20, the horizontal fluidity of the concrete is general; when the evaluation index P of the horizontal fluidity is more than 20, the horizontal fluidity of the concrete is poor.
The invention has the beneficial effects that: the invention has simple structure and simple and convenient operation, can comprehensively evaluate the horizontal flow performance of the concrete and the relation between the flow performance and the flow time, and overcomes the problems of single test result, test structure randomness and the like of the existing test method.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention
FIG. 2 is a front cross-sectional view of the present invention
FIG. 3 is a concrete height measuring point layout diagram of the present invention
Detailed Description
The embodiment of the invention is illustrated in the combined drawing, and the device for testing the horizontal flow performance of concrete comprises a bottom plate 1, side baffles 2, rivets 3, a conical funnel 4, a funnel switch 5 and a funnel handle 6, wherein the rivets 3 are uniformly distributed on the upper surface of the bottom plate 1, and the bottom plate 1 and the side baffles 2 form a bottom groove for measuring the horizontal flow performance of concrete. The bottom plate 1 is a square with the size of 600mm multiplied by 600 mm; the side baffle 2 is a rectangle with the size of 200mm multiplied by 600 mm; the diameter of each rivet 3 is 10mm, the height of each rivet is 180mm, and the distance between every two adjacent rivets 3 is 100 mm; the distance between the side baffle 2 and the adjacent rivet 3 is 100 mm; the diameter of the upper end opening of the cone-shaped funnel 4 is 500mm, the diameter of the lower end outlet is 100mm, the height of the cone is 660mm, and the height of the cylinder with the diameter of the lower part of 100mm is 55 mm.
The concrete horizontal flow performance testing method of the embodiment comprises the following specific steps: step one, filling the conical funnel 4 with concrete, placing the conical funnel 4 at a position 300mm above the bottom groove, opening a conical funnel switch 5, and calculating the outflow time t of the concrete from the conical funnel 4.
Step two, measuring the height of the concrete at the center position in the bottom groove, near the side baffle 2 and near each rivet 2, specifically measuring point positions are shown in figure 3, and calculating according to the height of each measuring point to obtain a variance S2：
In the formula: x is the number of1、x2…x25The height values of the concrete of 25 measuring points in the bottom groove are obtained;
the height of 25 measuring points in the concrete in the bottom groove is the average value.
From the measurement result, the variance S is calculated2And the outflow time t into a calculation model of the horizontal fluidity evaluation index P:
P＝2/3·S2+1/3·t
when the horizontal fluidity evaluation index is more than 0 and less than or equal to 10, the horizontal fluidity of the concrete is better; when the horizontal fluidity evaluation index is more than 10 and less than or equal to 20, the horizontal fluidity of the concrete is general; when the evaluation index P of the horizontal fluidity is more than 20, the horizontal fluidity of the concrete is poor.
Example 1 is provided to show the reliability of the test apparatus and method for evaluating the horizontal flow property of concrete.
The concrete horizontal flow performance test device and the evaluation method in example 1 adopt the device shown in the abstract of the invention, and the concrete adopts three different flow performance mixing ratios to test and evaluate the concrete horizontal flow performance, wherein the test mixing ratio is shown in table 1.
TABLE 1 concrete horizontal flow test mix ratio (Kg/m)3)
| Numbering | Water (W) | Cement | Fly ash | Sand | Crushing stone | Water cement ratio |
| C1 | 111 | 370 | 0 | 740 | 1000 | 0.3 |
| C2 | 148 | 310 | 60 | 800 | 960 | 0.4 |
| C3 | 185 | 245 | 125 | 860 | 900 | 0.5 |
After the concrete was stirred, the concrete was put into a conical hopper to perform a horizontal fluidity test of the concrete, and the test results are shown in table 2.
TABLE 1 horizontal fluidity test results of concrete
Tests have shown that the outflow time of the concrete from the cone hopper is longer in the group C1, and the horizontal flow capacity of the group is poorer because the concrete in the bottom trough fails to flow to the edge of the side wall. The outflow time of the concrete in the C2 group from the cone-shaped funnel is moderate, the concrete in the bottom groove basically covers the whole bottom plate, but the height difference of the concrete in the bottom groove is large, and the horizontal flow capacity of the group of concrete is general. The outflow time of C3 group's concrete from the conical hopper is shorter, and the concrete is evenly distributed in the kerve, and the difference in height of concrete in the kerve is less, and the horizontal flow ability of this group's concrete is better.
The test result is highly consistent with the evaluation result of the horizontal fluidity of the concrete, which shows that the test device and the evaluation method of the horizontal fluidity of the concrete have high reliability and convenient operation, and can be widely used for the horizontal fluidity test of the concrete.
Claims (1)
1. A measuring method of horizontal flow performance of concrete is provided, and the applied device comprises a bottom plate (1), a side baffle (2), a rivet (3), a conical funnel (4), a funnel switch (5) and a funnel handle (6); the rivets (3) are uniformly distributed on the upper surface of the bottom plate (1), and the bottom plate (1) and the side baffle plates (2) form a bottom groove for measuring the horizontal flow performance of concrete;
the method is characterized by comprising the following steps:
filling a conical funnel (4) with concrete, placing the conical funnel at a position 300mm above a bottom groove, opening a conical funnel switch, and calculating the outflow time t of the concrete from the conical funnel (4);
step two, measuring the height of the concrete at the positions of 25 measuring points on the bottom plate (1), wherein the concrete distribution positions of the 25 measuring points are as follows: 4 measuring points at four right-angle positions of the bottom plate (1), 8 measuring points at trisection positions on four sides of the bottom plate (1), 9 measuring points at sextant positions on two diagonal lines of the bottom plate (1), and 4 measuring points at positions apart from the side 1/6 on the side length on the perpendicular bisector of the four sides of the bottom plate (1); then root ofCalculating the variance S according to the height of 25 measuring points2：
In the formula: x is the number of1、x2…x25The concrete height value is 25 measuring points;
the average value of the height of 25 measuring points of the concrete is obtained;
the variance S2And the outflow time t into a calculation model of the horizontal fluidity evaluation index P:
P＝2/3·S2+1/3·t
when the horizontal fluidity evaluation index is more than 0 and less than or equal to 10, the horizontal fluidity of the concrete is better; when the horizontal fluidity evaluation index is more than 10 and less than or equal to 20, the horizontal fluidity of the concrete is general; when the evaluation index P of the horizontal fluidity is more than 20, the horizontal fluidity of the concrete is poor.
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