KR20160008891A - Apparatus for evaluating fluidity of concrete and method for evaluating fluidity of concrete using thereof - Google Patents
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- KR20160008891A KR20160008891A KR1020140089279A KR20140089279A KR20160008891A KR 20160008891 A KR20160008891 A KR 20160008891A KR 1020140089279 A KR1020140089279 A KR 1020140089279A KR 20140089279 A KR20140089279 A KR 20140089279A KR 20160008891 A KR20160008891 A KR 20160008891A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
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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
- G01N11/08—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 measuring pressure required to produce a known flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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Abstract
The present invention relates to an apparatus and a method for evaluating the flowability of a concrete for evaluating the flowability and material separation of a non-beam concrete and a fiber-incorporated high performance concrete. According to the present invention, the flowability is measured using a flow table, Evaluation of the flowability of concrete based on the results of measurement of the plastic viscosity and yield value using a Rheology instrument, it takes a long time for the measurement, an economical problem due to the difficulty of the operation and the use of expensive equipment, In order to solve the problems of the methods, a flow table plate for measuring the flowability of concrete by improving the configuration of the flow table for cement test specified in the existing KS L 5111, a flow table support for supporting the flow table plate, To fix the table plate to the flow table support, And a plurality of clamps provided on the bottom surface of the flow table plate. Thus, it is possible to easily measure the material separation and flowability of the concrete by using a single device without using expensive rheology devices, thereby shortening the measurement time There is provided an apparatus for evaluating the flowability of concrete and a method for evaluating the flowability of concrete using the apparatus.
Description
The present invention relates to an evaluation apparatus and method for evaluating the fluidity of concrete, and more particularly, to a fluidity evaluation apparatus for evaluating flowability and material separation of a non-beam concrete and a fiber- And a fluidity evaluation method.
In addition, the present invention relates to a method for evaluating flow performance of a fiber-impregnated high-performance concrete in which fluidity deteriorates, measuring fluidity using a flow table, and measuring the plastic viscosity and yield value using an expensive rheology apparatus The present invention relates to a concrete fluidity evaluation apparatus and method for evaluating the flowability of a concrete to solve the problems of the conventional evaluation methods which take time for measurement, The present invention relates to a method for evaluating flowability of a concrete used.
The present invention further improves the configuration of the flow table for cement test specified in the existing KS L 5111 and uses a flow table equipped with a table plate designed to measure flowability and material separation for each diameter size, , And the ring spacing and the spreading interval are measured to easily determine the relationship between yield value and plastic viscosity without using expensive equipment such as conventional rheology equipment. The present invention relates to an apparatus for evaluating the flowability of concrete and a method of evaluating the flowability of concrete using the apparatus.
In recent years, with the progress of industrialization, high-rise buildings have been accelerated, and the construction of skyscrapers far exceeding the existing scale is increasing.
Here, for the construction of such a skyscraper, it is necessary to use higher-performance high-strength concrete instead of general concrete, and it is important to accurately evaluate the flow performance of such high-performance concrete for the safety of the building.
As an example of the prior art for evaluating the flow performance of such a high-performance concrete, there is disclosed an apparatus and a method for automatically measuring the slump flow of concrete using a computing device as disclosed in Korean Patent No. 10-0836464, And Korean Patent No. 10-1264999, entitled " Device for Measuring Flowability of Concrete ".
More specifically, the apparatus and method for automatically measuring slump flow of concrete using the computing apparatus disclosed in the above-mentioned Japanese Patent No. 10-0836464 are configured to photograph a concrete flowing on a flat plate with a digital camera at predetermined time intervals, The method of measuring the slump flow of the concrete by analyzing the position of the pixel on the boundary line between the slump plate and the concrete for each of the images taken requires the expensive equipment and the environment of the construction site with many dust and moisture There is a problem that the measurement site is limited due to difficulty in obtaining a clear image through camera shooting.
In addition, a measurement method using a laser beam instead of a conventional camera has been proposed. However, this method also requires a plurality of light-receiving sensors because light-receiving sensors are arranged at regular intervals on the edge of a rectangular plate, , There is a problem that the measurement accuracy varies depending on the arrangement interval of the light receiving sensors, and accuracy is lowered.
Therefore, in order to solve the problems of the measuring device using laser as described above, the flowability measuring device of concrete disclosed in Korean Patent No. 10-1264999 is simple in installation, easy to adjust the irradiation interval of light, The present invention also provides a method for measuring the flowability of concrete which can improve the measurement accuracy because the light receiving can be performed in multiple directions. However, this method is also problematic in that the configuration of the apparatus is complicated, Was the same.
Here, as a method for evaluating the flow performance of the high-performance concrete presented in the Korean Industrial Standard (KS), for example, a slump flow test method of the unhardened concrete given in KS F 2594, The same regulations as the flow table for cement testing are provided.
More specifically, for example, a method for evaluating the flow performance of high performance concrete using the flow table for cement test specified in KS L 5111 is disclosed in Japanese Patent Laid- Or concrete and measuring the yield and the plastic viscosity using a device called Rheology and evaluating the flowability based on the respective measured values.
However, in the conventional evaluation method as described above, since the measurements must be performed separately using the respective equipment called the flow table and the rheology, the whole procedure takes a long time and troublesome problems.
In addition, the conventional evaluation method as described above has a problem that the measurement process is cumbersome and takes a long time due to the high price of the rheology measuring device, and the cost required for the measurement also increases.
Therefore, in order to solve the problems of the conventional evaluation methods in which the measurement process for evaluating the flow performance of the high performance concrete is troublesome and takes a long time and the cost required for the measurement is increased as described above, The flow table of the present invention is improved so that it is possible to measure not only the flow measurement but also the yield value and the plastic viscosity in a single device so as to shorten the measurement time and reduce the cost, It is desirable to provide an apparatus and method for evaluating the flowability of concrete, but a device or a method that satisfies all of the requirements has not yet been provided.
[Prior Art Literature]
1. Korean Patent No. 10-1264999 (2013.05.09.)
2. Korean Patent No. 10-0836464 (Jun. 2, 2008)
3. U.S. Patent No. 5,258,622 (November 22, 1993).
4. Korean Registered Utility Model No. 20-0431985 (November 21, 2006)
SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the prior art as described above, and it is an object of the present invention to provide a method for evaluating flowability of a fiber- The evaluation of the flowability of the concrete based on the results of measuring the plastic viscosity and the yield value using the Rheology equipment of the present invention, which takes a long time for the measurement, and the economical problems caused by the difficulty of the operation and the expensive equipment, In order to solve the problems of the evaluation methods of the technology, it is possible to easily measure the fluidity and the material separation with a simple structure using a single device, thereby reducing the measurement time and reducing the cost of the concrete Evaluation apparatus and method for evaluating fluidity of concrete using the same .
Another object of the present invention is to further improve the structure of the flow table for cement test specified in the existing KS L 5111 and to use the table plate manufactured to measure fluidity and material separation according to the size of the diameter, the material separation can be measured visually by measuring the presence or absence of a ring and the spread of the sample on the table plate and measuring the spread by measuring using a caliper to measure the fluidity, This material is designed to be able to easily measure and evaluate the fluidity and material separation of high-performance concrete mixed with non-beam concrete and fiber without the need to derive the relationship between the yield value and the plastic viscosity so as to shorten the measurement time and reduce the cost And a method for evaluating the fluidity of concrete using the apparatus To parties.
In order to achieve the above-mentioned object, according to the present invention, fluidity is measured using a flow table, fluidity of concrete is evaluated based on measurement of plastic viscosity and yield value using a Rheology machine The present invention relates to a concrete flowability evaluation apparatus for solving the problems of the prior art in which measurement takes a long time and troublesome and cost increases, A flow table support for supporting the flow table plate; And a plurality of clamps mounted on a bottom surface of the float table for fixing the float table to the float table support, thereby being capable of measuring the separation and fluidity of the concrete using a single device The present invention provides a fluidity evaluation apparatus for a concrete, which is configured to shorten the measurement time and reduce the cost.
Here, the flow table plate is formed in the shape of a rectangular plate using a material including acrylic, and the display unit further includes a plurality of concentric circles serving as graduations on the upper surface.
Further, the float table support is characterized in that it is configured to satisfy the conditions set out in the provisions of KS L 5111. [
In addition, the fluidity evaluating apparatus may be configured such that the fluidity evaluating apparatus is installed on a flat surface, the flow table plate is wiped with a wet towel, a frame is installed to surround the outer surface of the flow table plate, a sample is filled in the frame, The upper part of the frame is flattened, the frame is vertically lifted and removed, and a predetermined time is predetermined by using a cam provided on the float table support after a predetermined time has elapsed, The spread of the sample on the flow table plate is measured after the impact is applied, the material separation is measured with the naked eye, and the spread of the sample is measured by using the concentric circle and the caliper formed on the display unit, Material separation with a single device without the need for And is configured to measure the homogeneity.
Here, the fluidity evaluating apparatus may be configured to lift the frame and remove it, and after one minute has elapsed, the fluidity evaluating unit applies the hit for 25 times for 15 seconds.
Further, according to the present invention, there is provided a method for evaluating the flowability of concrete using the apparatus for evaluating the flowability of concrete, wherein the flowability evaluation apparatus is installed on a flat surface, the flow table plate of the flowability evaluation apparatus is wiped with a wet towel, Providing a frame to surround the outer surface of the flow table plate; Fixing the mold so as not to move, filling the mold with the sample, flattening the upper part with the trowel, lifting the mold vertically and removing the mold; Applying a predetermined number of strokes for a predetermined period of time using a cam provided on a flow table support of the fluidity evaluating device after a predetermined period of time has elapsed; And the spread of the sample on the flow table plate is measured and the separation of the sample material is measured with the naked eye. The spread of the sample is measured using a concentric circle and a caliper formed on the display portion of the flow table plate, The method comprising the step of measuring the fluidity so as to be able to measure the material separation and fluidity with a single device without the use of expensive equipment.
Here, the step of applying the hitting may be performed by lifting the frame and removing it, and after one minute has elapsed, the hitting is performed 25 times for 15 seconds.
As described above, according to the present invention, it is possible to provide a flowability evaluating apparatus for a concrete, which is constructed so as to be able to easily measure flowability and material separation with a simple structure using a single apparatus, And a method for evaluating the flowability of concrete using the same, flowability was measured using a flow table to evaluate the fluidity of the fiber mixed high performance concrete, and the plastic viscosity and yield value were measured using an expensive rheology apparatus It is possible to solve the problems of the prior art in which the measurement is time-consuming, difficult to operate, and economically problematic due to use of expensive equipment.
Further, according to the present invention, the configuration of the flow table for cement test specified in the existing KS L 5111 is improved, and the number of hits, the presence or absence of rings And the spread of the sample on the table plate can be measured and the material separation can be measured with the naked eye, and the spread can be measured by using a caliper to measure the fluidity. Using the expensive rheology device, the yield value and the plastic viscosity The present invention provides a fluidity evaluation device for concrete which is configured to easily measure and evaluate fluidity and material separation of high performance concrete mixed with non-beam concrete and fiber made of a single device without needing to derive a relationship, The flow table is used to measure fluidity and an expensive rheology device And can solve the problems of the prior art, it takes time to measure by evaluating the fluidity of the concrete based on the result of the measurement plastic viscosity and yield value of old who have economic problems due to the difficulty of the operation and the use of expensive equipment occurs.
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view schematically showing the overall structure of a concrete fluidity evaluation apparatus according to an embodiment of the present invention; FIG.
2 is a plan view schematically showing a concrete structure of a flow table of an apparatus for evaluating the flowability of concrete according to an embodiment of the present invention shown in Fig.
FIG. 3 is a flow chart schematically showing the overall structure of a method for evaluating flowability of concrete using the apparatus for evaluating the flowability of concrete according to the embodiment of the present invention shown in FIGS. 1 and 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, concrete embodiments of an apparatus for evaluating flowability of concrete according to the present invention and a method for evaluating flowability of concrete using the apparatus will be described.
Hereinafter, it is to be noted that the following description is only an embodiment for carrying out the present invention, and the present invention is not limited to the contents of the embodiments described below.
In the following description of the embodiments of the present invention, parts that are the same as or similar to those of the prior art, or which can be easily understood and practiced by a person skilled in the art, It is important to bear in mind that we omit.
That is, the present invention relates to a method for evaluating flowability of a fiber-incorporated high performance concrete in which fluidity deteriorates, as described later, by using a flow table to measure fluidity, and using an expensive rheology device, In order to solve the problems of the conventional evaluation methods in which the measurement of the flowability of the concrete is based on the result of the measurement of the yield value, the measurement takes a long time and the economical problems due to the difficulty of operation and the use of expensive equipment occur. And a fluidity evaluation method of the concrete using the same.
The present invention further improves the configuration of the flow table for cement test specified in the existing KS L 5111 and uses a flow table equipped with a table plate designed to measure flowability and material separation for each diameter size, , And the ring spacing and the spreading interval are measured to easily determine the relationship between yield value and plastic viscosity without using expensive equipment such as conventional rheology equipment. The present invention relates to an apparatus for evaluating the flowability of concrete and a method of evaluating the flowability of concrete using the apparatus.
Next, with reference to the accompanying drawings, concrete embodiments of a fluidity evaluation apparatus for concrete according to the present invention and a fluidity evaluation method for concrete using the same will be described.
Before describing concrete contents of the fluidity evaluation apparatus for concrete according to the embodiment of the present invention, first, the configuration of the flow table for cement test prescribed in the existing KS L 5111 will be described. It shall consist of a support and a circular solid table with a diameter of 255 ± 2.5 mm and shall be connected perpendicularly to the table surface by means of a shaft or a screw which is connected to the shoulder which is in full contact with the table surface, It shall be mounted on a support so that the prescribed height can be moved vertically.
Also, the table surface is formed of cast brass or bronze, the thickness of the periphery is 7.5 mm, the table surface and the shaft connected thereto are 4.08 ± 0.05 kg in weight, and the weight is distributed symmetrically around the center of the shaft do.
In addition, the cam and the vertical axis are formed of heavy carbon steel, the shaft must be straight and the end of the shaft should not fall on the cam when it is dropped, but should contact the cam at 120 ° or more from the drop point.
Furthermore, the cam surface is a smooth spiral curve with a uniform increase in radius from 13 mm to 32 mm over 360 [deg.], No unpleasant fricatives when the shaft comes into contact with the cam, and the flow table support casts with a single piece of high- Should be.
Here, the mold for making the flow test body is made of cast bronze or brass, and the height of the mold is 50 ± 0.5 mm, the diameter of the hole on the mold is 70 mm, and the diameter of the hole on the mold is 100 mm.
The construction of the flow table for cement test specified in KS L 5111 has already been disclosed and is obvious to those skilled in the art. For the sake of simplicity, here is a detailed description of the flow table for cement test specified in KS L 5111 A detailed description thereof will be omitted.
That is, conventionally, the flow is measured using a flow table for cement test configured to satisfy the above-mentioned KS L 5111, and the plastic viscosity and the yield value are measured using a Rheology instrument, The measurement is time-consuming and troublesome, and the cost is increased due to the use of expensive equipment.
Accordingly, in order to solve the problems of the conventional concrete fluidity evaluating methods as described above, the present invention is to evaluate the fluidity of the concrete easily and inexpensively with a single device without using expensive equipment, as described later And a method for evaluating the flowability of concrete using the same.
1 and 2, FIG. 1 is a view schematically showing the overall configuration of an
1, the
Here, the above-mentioned
1, a plurality of
In addition, the
The flow
At this time, the frame should be fixed so that it does not move while filling the sample. After filling the sample, flatten the top of the frame with a trowel.
Next, the frame is vertically lifted and removed, and the frame is placed for about 1 minute. Then, the cam provided on the
Thereafter, the spread of the sample of the
Therefore, by using the above-described structure, by using the apparatus for evaluating the flowability of concrete 10 according to the embodiment of the present invention, it is possible to easily measure the material separation and fluidity with a single apparatus without using high- can do.
3 is a flow chart schematically showing the overall structure of a method for evaluating the flowability of concrete using the apparatus for evaluating the flowability of concrete according to the embodiment of the present invention shown in FIGS. 1 and 2. As shown in FIG.
3, the method for evaluating the flowability of concrete using the apparatus for evaluating the flowability of concrete according to an embodiment of the present invention is roughly divided into a
Next, the frame is fixed so as not to move, the sample is filled in the frame, the upper part is flattened with the trowel, and the frame is vertically lifted and removed (step S32).
Subsequently, the sample is placed for about one minute, and the sample is struck 25 times for 15 seconds, for example, using the cam provided on the
Thereafter, the spread of the sample of the
Therefore, the apparatus for evaluating the flowability of concrete according to the present invention and the method for evaluating the flowability of concrete using the apparatus can be implemented as described above.
As described above, by implementing the apparatus for evaluating the fluidity of concrete according to the present invention and the method for evaluating the flowability of concrete using the same, it is possible to easily measure the fluidity and the material separation The present invention provides a fluidity evaluating apparatus for a concrete which is constructed so as to be able to measure a time and a cost while reducing the time required for measuring a fluidity of a concrete, And the flowability of the concrete is evaluated based on the results of measuring the plastic viscosity and the yield value using an expensive rheological apparatus. Thus, it takes a long time for the measurement, In the prior art in which an economical problem has occurred You can solve the problem.
In addition, according to the present invention, the configuration of the flow table for cement test specified in the existing KS L 5111 is improved, and the number of hits, the presence or absence of rings And the spread of the sample on the table plate can be measured and the material separation can be measured with the naked eye and the spread can be measured by using a caliper to measure the fluidity. Using the expensive rheology device, the yield value and the plastic viscosity The present invention provides a fluidity evaluation device for concrete which is configured to easily measure and evaluate fluidity and material separation of high performance concrete mixed with non-beam concrete and fiber made of a single device without needing to derive a relationship, The flow table is used to measure the fluidity and use an expensive rheology instrument Based on the results measured using a plastic viscosity and yield value and can take a long time for measurement by evaluating the fluidity of the concrete to solve the problems of the prior art, who have economic problems caused by the difficulties and expensive equipment used in the operation occurred.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that various changes, modifications, combinations, and substitutions may be made without departing from the spirit and scope of the present invention as defined by the following claims. would.
10. Concrete
12.
14. Clamp
Claims (7)
A flow table plate for measuring the flowability of concrete;
A flow table support for supporting the flow table plate; And
And a plurality of clamps mounted on the bottom surface of the flow table plate for fixing the flow table plate to the flow table support base,
Wherein the apparatus is configured to be able to measure the material separation and fluidity of the concrete using a single apparatus so that the measurement time can be shortened and the cost can be reduced.
The flow table plate includes:
And is formed into a rectangular plate shape using a material including acrylic,
Further comprising a display portion on which a plurality of concentric circles serving as graduations are displayed on the upper surface.
The flow table support includes:
And the test specimen is constructed so as to satisfy the conditions set forth in the provisions of KS L 5111.
The fluidity evaluating apparatus comprises:
The flowability evaluation apparatus is installed on a flat surface, the flow table plate is wiped with a wet towel, a frame is installed to surround the outer surface of the flow table plate, a sample is filled in the frame, and the upper part of the frame is flattened give,
After the frame is vertically lifted and removed, a certain predetermined number of strokes are applied for a predetermined period of time using a cam provided on the float table support after a predetermined time has elapsed,
Measuring the spread of the sample on the flow table plate after applying the blow, measuring the material separation by the naked eye, measuring the spread of the sample using the concentric circle and the caliper formed on the display unit, Wherein the apparatus is configured to measure material separation and fluidity with a single apparatus without the use of expensive equipment.
The fluidity evaluating apparatus comprises:
Wherein the frame is lifted and removed, and after one minute has elapsed, it is struck 25 times for 15 seconds.
Installing the fluidity evaluating device on a flat surface, wiping the flow table plate of the fluidity evaluating device with a wet towel, and then installing a frame to surround the outer surface of the flow table plate;
Fixing the mold so as not to move, filling the mold with the sample, flattening the upper part with the trowel, lifting the mold vertically and removing the mold;
Applying a predetermined number of strokes for a predetermined period of time using a cam provided on a flow table support of the fluidity evaluating device after a predetermined period of time has elapsed; And
The spread of the sample on the flow table plate is measured and the separation of the sample material is measured with the naked eye and the spread of the sample is measured using a concentric circle and a caliper formed on the display portion of the flow table plate, And measuring the temperature of the liquid,
Characterized in that it is configured to measure material separation and fluidity with a single device without the need to use expensive equipment.
The step of applying the hitting comprises:
Wherein the frame is lifted and removed, and after one minute has elapsed, it is struck 25 times for 15 seconds.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020201186A1 (en) * | 2019-04-03 | 2020-10-08 | Peri Gmbh | Measuring the consistency of fresh concrete |
| CN115235949A (en) * | 2022-07-15 | 2022-10-25 | 福州大学 | Portable cement mortar fluidity measuring ruler and measuring method thereof |
| KR102505109B1 (en) | 2022-02-23 | 2023-03-03 | 단국대학교 산학협력단 | A method of deriving optimal resting cycle of material for additive-type 3D concrete printing using thixotropic behavior |
-
2014
- 2014-07-15 KR KR1020140089279A patent/KR20160008891A/en active Search and Examination
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020201186A1 (en) * | 2019-04-03 | 2020-10-08 | Peri Gmbh | Measuring the consistency of fresh concrete |
| KR102505109B1 (en) | 2022-02-23 | 2023-03-03 | 단국대학교 산학협력단 | A method of deriving optimal resting cycle of material for additive-type 3D concrete printing using thixotropic behavior |
| CN115235949A (en) * | 2022-07-15 | 2022-10-25 | 福州大学 | Portable cement mortar fluidity measuring ruler and measuring method thereof |
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