KR20190029146A - Concrete Segregation Measuring Method - Google Patents

Abstract

The present invention relates to a concrete segregation measuring method to determine whether concrete is segregated through resistivity measurement of the concrete, which comprises the following steps of: preparing concrete in which water, cement, an aggregate, and a mixing material are mixed; depositing the concrete in a mold formed by a plurality of mold units; measuring each of resistivity of the deposited concrete in a plurality of ring electrode units individually mounted and installed at an internal side of the mold units; and determining whether the concrete is segregated through each resistivity value transmitted from the ring electrode units in a measurement unit connected to and installed in the ring electrode units.

Description

Concrete Segregation Measuring Method

The present invention relates to a concrete material separation measurement method, and more particularly, to a concrete material separation measurement method for reading whether a concrete is separated or not by measuring an electrical resistivity of the concrete.

When concrete is used as a typical construction material, material separation during concrete pouring may occur due to poor mixing of concrete.

Concrete (water, cement, aggregate, and admixture) is a construction material that is put into a mold after mixing (curing) and has a strength after curing process. The mixing condition and mixing ratio of water, cement, aggregate and admixture In case of failure, the internal material is separated rather than the uniform distribution of materials (because the density of each material is different), which is called material separation of concrete.

Therefore, a proper blending ratio is required for concrete formulations and construction, and when aggregate separation (or material separation) occurs when the blend is poor, the concrete can not function as a defective strength or a desired construction material after construction.

Accordingly, the conventional measurement method used for the material separation measurement is ASTM C 1610 measurement method (a three-layer cylindrical type three-layer separable concrete is filled with a pre-hardening concrete, and the coarse aggregate amount distributed in each layer is measured wet-sieving, and sieving tests), the coarse aggregate measurement occurred during the pouring of the cylinder. This conventional method requires a lot of time and labor, It has been required to develop a real-time material separation measurement method that excludes a material.

Korean Patent No. 10-1300813 Korean Patent No. 10-1055224

One aspect of the present invention provides a concrete material separation measuring method for reading whether or not a material of the concrete is separated through an electrical resistivity measurement of the concrete.

The technical problem of the present invention is not limited to the technical problems mentioned above, and other technical problems which are not mentioned can be understood by those skilled in the art from the following description.

According to an embodiment of the present invention, there is provided a method of separating concrete material, comprising the steps of: preparing concrete containing water, cement, aggregate, and admixture; Placing the concrete in a mold formed by vertically coupling a plurality of mold parts; Measuring a specific resistance of the concrete poured in a plurality of ring electrode parts mounted on the inside of the mold part, respectively; And reading out the material of the concrete through the resistivity values transmitted from the ring electrode unit in the measuring unit connected to the ring electrode unit.

In one embodiment, the mold portion comprises: a cylindrical body; A seating protrusion protruding along the inner side of the body so as to seat the ring electrode unit on the inner side; And a through hole formed through one side of the main body.

In one embodiment, the body includes: a first fastening protrusion protruding downwardly along a lower inner side for fastening to an upper portion of the other body; And a second fastening protrusion protruded upward along the upper side to fasten the lower portion of the other body.

In one embodiment, the ring electrode portion is formed of an electrode in the form of a circular ring, and it is possible to measure the specific resistance at all the positions to which it touches.

In one embodiment, each of the plurality of ring electrode units may measure the resistivity all at once, and the measured resistivity values may be collectively transmitted to the measurement unit.

In one embodiment, the step of measuring the resistivity may sequentially measure the resistivity from the ring electrode unit located on the upper side to the ring electrode unit located on the lower side, and then sequentially transmit the measured resistivity values to the measurement unit.

In one embodiment, each of the resistances may be measured by measuring a specific resistance of the plurality of ring electrode units at predetermined intervals, and then transmitting the measured resistivity values to the measurement unit at predetermined intervals.

In one embodiment, the step of reading whether the concrete is separated from the material may include comparing the respective resistivity values transmitted from the ring electrode unit in the measurement unit; And reading the separation of the concrete from the material according to respective resistivity values in the measurement unit.

In one embodiment, the step of comparing the resistivity values may sequentially compare the resistivity values transmitted from the ring electrode unit located at the lowermost end from the resistivity values transmitted from the ring electrode unit located at the uppermost end.

In one embodiment, the step of comparing the resistivity values may compare an average value of the resistivity values transmitted from the upper ring electrode unit and an average value of the resistivity values transmitted from the ring electrode unit located below.

In one embodiment, the step of reading material separation may read that material separation has not occurred if each of the compared resistivity values is within an error range, and read out that material separation has occurred if the resistivity value is outside the error range .

In one embodiment, before the step of reading the material separation, a step of measuring the ambient temperature may be performed in a temperature sensor mounted on the inner space or the outer side of the mold part.

In one embodiment, the step of reading the material separation may include storing the temperature at which the material is separated from the concrete, which is received from the temperature sensor, into a database for each temperature.

In one embodiment, the step of preparing the concrete may comprise preparing a mortar and a concrete according to the mixing ratio of the fine aggregate and the coarse aggregate of 1: 1 or 1: 2 relative to the weight of the cement in order to analyze the effect of the mixing ratio of the aggregate .

In one embodiment, the step of preparing the concrete may include adding an AE agent and a fluidizing agent to exhibit the effect of a chemical admixture.

According to one aspect of the present invention, there is provided a concrete material separation measuring method for reading whether a concrete material is separated by measuring an electrical resistivity of the concrete, Can be reflected.

Fig. 1 is a view showing a schematic configuration of a concrete material separation measuring apparatus used for measuring resistivity according to the present invention.
Fig. 2 is a view for explaining the first embodiment of the mold part in Fig. 1; Fig.
Fig. 3 is a view for explaining a second embodiment of the mold part shown in Fig. 1;
4 is a view for explaining the ring electrode portion shown in Fig.
Fig. 5 is a view for explaining the measuring unit shown in Fig. 1. Fig.
6 is a view showing an embodiment of a concrete material separation measuring apparatus used for the resistivity measurement of the present invention.
FIG. 7 is a flowchart illustrating a concrete material separation measurement method according to an embodiment of the present invention.
Fig. 8 is a flowchart for explaining the step of reading whether or not the concrete in Fig. 7 is separated from the material.
9 is a diagram showing a change in microstructure due to hydration of cement particles.
10 is a view for explaining the 4-electrode method.

The following detailed description of the invention refers to the accompanying drawings, which illustrate, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

Fig. 1 is a view showing a schematic configuration of a concrete material separation measuring apparatus used for measuring resistivity according to the present invention.

Specifically, the concrete material separation measuring apparatus according to an embodiment of the present invention includes a plurality of mold units 100, a plurality of ring electrode units 200, and a measurement unit 300.

Before describing the respective constitutions in detail, the cause of the change of the electric conductivity according to the hydration process of the concrete, which is the theoretical background of the present invention, can be explained as follows.

,

,

등의 이온이 용출되고, 이러한 이온들의 반응을 통해 수화물이 생성 된다. 생성된 수화물에 의해 시멘트 입자들의 응집(flocculation and aggregation)이 발생하며 최종적으로 도 9(b)와 같이 fluid depercolation 상태로 미세구조가 발전한다. 즉 공극수 감소에 따라 재료 내 전기 전도성 감소가 발생하며, 이는 수화물 증가에 따른 전자 흐름의 방해 때문인 것으로 설명될 수 있다. 따라서 재료 내 전기 저항 변화 측정으로 콘크리트의 수화물 생성 및 경화 과정을 나타낼 수 있다.Hardening and solidification of the material proceed according to the hydration reaction at the early age curing of the concrete. If the microstructure of the cement paste as the hydration reaction progresses is classified according to the phase change before and after hardening 9. 9 (a) can be defined as a fluid percolation state in which a pore water network is formed in a hydration reaction state immediately after the cement paste is mixed. This may result in electrical conductivity in the material through internal pore water in a fired state where the fluidity and viscosity of the pre-condensation material is sufficient. Thereafter, as the hydration reaction progresses

,

,

And the like, and the hydrate is generated through the reaction of these ions. The flocculation and aggregation of the cement particles occurs due to the generated hydrate, and ultimately the microstructure develops in a state of fluid depercolation as shown in FIG. 9 (b). That is, as the porosity decreases, the electrical conductivity in the material decreases, which can be explained by the obstruction of the electron flow due to the increase of the hydrate. Therefore, it is possible to show the process of hydration formation and curing of concrete by measuring electrical resistance change in the material.

Wenner's 4-electrode method (Wenner's 4-electrode method) is a resistivity measurement technique proposed by Frank Wenner in 1915. The current and voltage electrodes are installed at equal intervals And have been used to measure earth resistivity. FIG. 10 is a schematic diagram of the 4-electrode method, in which four electrodes (current-assist poles: two external electrodes, two potential-assist poles: two internal electrodes) are provided at equal intervals on a straight line, Measure the current (I). The internal electrode is connected to a voltmeter to measure the voltage (V) induced between the electrodes. That is, a current is flowed by connecting a power source between the external electrodes, and the ground resistance is calculated according to the measurement result of the voltmeter and the ammeter and the Ohm's law (R = V / I). Therefore, when the interval between the electrodes is a, the electrical resistivity in the material is calculated from the equation (1), and the calculated electrical resistivity value shows an average electrical resistivity of a depth.

는 전기비저항,

는 전극의 간격,

는 접지저항을 나타낸다.In Equation (1)

Is an electrical resistivity,

The distance between the electrodes,

Represents a ground resistance.

The mold part 100 is formed of a non-conductive material and is coupled with a vertically cylindrical shape so as to be able to pour the concrete to form a mold 1, and a ring electrode part 200 is mounted on the inner side, Measure.

In one embodiment, the mold part 100 may have various diameters or heights corresponding to the amount of concrete to be laid.

In one embodiment, the mold part 100 may have a lower lid (not shown in the drawings for the sake of explanation) for sealing the lower open space to prevent leakage of the poured concrete.

In one embodiment, the mold part 100 is formed of a transparent or translucent material, so that it is preferable that a worker easily visually confirm the installation height of the concrete poured therein.

The ring electrode unit 200 is formed in a circular ring shape and is installed inside the mold unit 100 so that the resistivity of the concrete placed on the mold 1 can be measured.

In one embodiment, the ring electrode portion 200 can be formed in a structure in which the layered structure is inserted inside the cylindrical mold 1.

The measuring unit 300 is connected to the ring electrode unit 200 and receives the measured resistivity value from the ring electrode unit 200 to measure whether or not the concrete placed in the mold 1 is separated from the material.

The concrete material separation measuring apparatus having the above-described construction can easily determine the state of the internal aggregate and the state of material separation through the electrical resistivity measurement unlike the conventional material separation measuring method.

The concrete material separation measuring apparatus having the above-described structure reads out the separation of the concrete from the concrete through the electrical resistivity measurement of the concrete, It is possible to reflect the material characteristics of all the positions where the ring electrode unit 200 touches inside the mold 1 of the shape.

Fig. 2 is a view for explaining the first embodiment of the mold part in Fig. 1; Fig.

Referring to FIG. 2, the mold unit 100 includes a main body 110, a mount projection 120, and a through hole 130.

The main body 110 is formed in a cylindrical shape, and a seating protrusion 120 is formed along the inner side.

In one embodiment, the body 110 may be formed of a cylindrical non-conductive material (e.g., a cylinder, an acrylic cylinder, or the like), and a ring electrode unit 200 as a conductor may be inserted therein.

The seating protrusion 120 is protruded along the inner side of the main body 110 so that the ring electrode unit 200 can be seated on the inside.

The through hole 130 is formed through one side of the main body 110 so that a connection pin 310 to be described later is inserted. The connection pin 310 is connected to the ring electrode unit 200 after passing through the main body 110 through the through hole 130 so that the resistivity value measured at the ring electrode unit 200 can be received .

The through hole 130 is formed to have a diameter corresponding to the thickness of the connection pin 310 so that it is formed unnecessarily large so that the space is formed even after the connection pin 310 is inserted into the mold 1 It is preferable to prevent the poured concrete from leaking through the space.

In one embodiment, the body 110 may have a height of 20 mm, and various heights may be formed corresponding to the amount of concrete being laid.

In one embodiment, the mold part 100 can form a cylindrical mold 1 having a height of 500 mm by fastening a plurality of main bodies 110 in the vertical direction, and the height of the cylindrical mold 1 can be varied .

Fig. 3 is a view for explaining a second embodiment of the mold part shown in Fig. 1;

3, the mold part 100 includes a main body 110, a seating protrusion 120, a through hole 130, a sealing seal 140, a first fastening protrusion 150 and a second fastening protrusion 160 ). Here, the main body 110, the seating protrusions 120, and the through holes 130 are the same as those of FIG.

The sealing seal 140 is formed on the upper portion or the lower portion of the main body 110 so as to seal the gap when the main body 110 is vertically fastened.

In one embodiment, the sealing seal 140 is preferably formed seamlessly in the middle along the upper or lower surface of the body 110 to thereby seal the upper or lower portion of the body 110 completely.

The first fastening protrusion 150 protrudes downward along the lower inner side of the main body 110-1 and has a second fastening protrusion 160 protruded upward from the upper side of the other main body 110-2, As shown in Fig.

The second fastening protrusion 160 protrudes upward along the outer side of the upper portion of the main body 110-2 and extends downward from the lower side of the main body 110-1 fastened to the upper side of the main body 110-2 The first fastening protrusion 150 is inserted into the space formed at the inner side and is fastened.

The sealing seal 140 is formed in the lower portion 140-2 of the first fastening protrusion 150 or the upper portion 140-1 of the second fastening protrusion 160 so that the mold 1 Can be prevented from leaking to the outside.

4 is a view for explaining the ring electrode portion shown in Fig.

Referring to FIG. 4, the ring electrode unit 200 is formed in a circular ring shape and mounted in a space formed inside the mold unit 100.

The ring electrode unit 200 may be formed to have a thickness of 2 mm, but the ring electrode unit 200 may have various thicknesses corresponding to a measurement environment (for example, an amount of concrete, a mixing ratio, etc.).

The ring electrode portion 200 can measure the specific resistance at all positions where the circular ring-shaped electrode touches.

Unlike the conventional resistivity measuring method, the ring electrode unit 200 having the above-described configuration forms a ring-shaped electrode and measures the resistivity at every position where the electrode touches, The resistivity of the poured concrete can be measured more effectively.

Fig. 5 is a view for explaining the measuring unit shown in Fig. 1. Fig.

Referring to FIG. 5, the measuring unit 300 includes a plurality of connecting pins 310, a plurality of connecting clips 320, and a material separation measuring unit 330.

The connection pin 310 is inserted through the through hole 130 and is connected to the ring electrode unit 200. A portion of the connection pin 310 not inserted in the through hole 130 is fastened to the connection clip 320, And transmits the measured resistivity value to the connection clip 320.

The connection clip 320 receives the resistivity values from the ring electrode unit 200 through the connection pins 310 after coupling the connection pins 310 and transfers the resistivity values to the material separation measurement unit 330. [ .

The material separation measuring unit 330 receives the resistivity value from the connection clip 320 and compares the received resistivity values to measure whether or not the concrete laid on the form 1 is separated from the material.

In one embodiment, the material separation measuring unit 330 receives the measured resistivity values of each of the plurality of connection pins 310-1 to 310-N, It is possible to measure whether or not the concrete is separated from the material.

For example, if the resistivity value of the concrete located at the upper part of the formwork (1) is 10, the resistivity value of the concrete at the lower part is 10, When the resistivity value of the concrete is 10, the resistivity values of the concrete at the lower part are 20, which indicates that the material separation occurred.

At this time, the resistivity values transmitted from the plurality of connection pins 310-1 to 310-N are compared with each other or divided into sections, and the average resistivity of the upper three connection pins 310-1 to 310-3 Value, the middle three connection pins 310-4 to 310-6, and the three lower connection pins 310-7 to 310-9.

In one embodiment, the material separation measurement unit 330 is a method of measuring the resistivity of a plurality of ring electrode units 200-1 to 200-N, including: i) a plurality of ring electrode units 200-1 to 200-N (Ii) a sequential measurement mode in which the resistivity is sequentially measured from the ring electrode unit 200-1 located on the upper side to the ring electrode unit 200-N located on the lower side, (iii) An interval measurement mode in which the plurality of ring electrode units 200-1 to 200-N measure the resistivity at predetermined intervals (for example, intervals of 30 minutes to 1 hour, etc.), and iv) (200-1 to 200-10) of the ring electrode unit 200-1 and the ring electrode unit 200-10 located at the lowermost end (the total number of the ring electrode units 200 is 200-1 to 200-10) And a deviation measurement mode that compares the deviation of the resistivity values of the ring electrode unit 200-5 and the ring electrode unit 200-6 located in the middle with each other, The.

In the above-described deviation measurement mode, when the material separation starts, the ring electrode unit 200-1 located at the uppermost position and the ring electrode unit 200 located at the lowermost position -10) is compared with the deviation of the resistivity value between the ring electrode unit 200-5 and the ring electrode unit 200-6 located in the middle where the material separation is expected to be least adjacent to each other , The degree of occurrence of material separation can be more accurately measured numerically. That is, when the deviation between the ring electrode units 200-1 and 200-10, which are expected to cause material separation the most, is 10, the ring electrode units 200-5 and 200-6 ) Is 3, it can be judged that the difference of the deviation is 7, which means that the material of the concrete is largely separated. When the deviation of the ring electrode parts 200-1 and 200-10 is 4, If the deviation of the ring electrode units 200-5 and 200-6 expected to occur in the enemy is 2, it can be judged that the difference of the difference is 2 and the material separation of the concrete is less occurred.

In one embodiment, the material separation measuring unit 330 measures the variation of the resistivity value transmitted from each of the ring electrode units 200-1 to 200-N in the case of the above-described interval measurement mode, And the variation of the resistivity value stored can be displayed on a display means (for example, an LCD / LED monitor, etc.) in a graph by time or by location.

6 is a view showing an embodiment of a concrete material separation measuring apparatus used for the resistivity measurement of the present invention.

Referring to FIG. 6, the concrete material separation measuring apparatus includes a plurality of mold units 100 and a plurality of ring electrode units 200.

The mold part 100 is formed of a non-conductive material and is fastened in a vertically cylindrical shape so as to be able to place the compounded concrete to form the mold 1. [

The ring electrode unit 200 is formed in a circular ring shape and is installed inside the mold unit 100 so that the resistivity of the concrete placed on the mold 1 can be measured.

In one embodiment, the ring electrode portion 200 may be formed with a thickness of 2 mm.

In one embodiment, the ring electrode portion 200 can measure the resistivity at all positions where the circular ring-shaped electrode touches.

FIG. 7 is a flowchart illustrating a concrete material separation measurement method according to an embodiment of the present invention.

Referring to FIG. 7, in the concrete material separation measuring method, concrete (710) prepared with water, cement, aggregate, and admixture which can be a sample for material separation measurement is prepared.

In one embodiment, in order to analyze the effect of the mixing ratio of the aggregate in the above-described step 710, the mortar and concrete are manufactured according to the mixing ratio of the fine aggregate and the coarse aggregate of 1: 1 or 1: 2 relative to the weight of the cement, AE agent and fluidizing agent can be added to show the effect of chemical admixture. As a result, it is possible to read the increase in the content of the aggregate or the occurrence of the material separation depending on whether the admixture is added or not.

After the concrete is prepared in the step 710, the concrete prepared in the step 710 is placed in the mold 1 formed by the plurality of the mold parts 100 (720).

After the concrete is poured in the step 720, the specific resistance of the concrete poured in the plurality of ring electrode units 200-1 to 200-N mounted respectively inside the plurality of mold units 100 is measured (730 ).

In one embodiment, in step 730, the resistivity of the concrete is sequentially measured from the ring electrode unit 200 located at the uppermost position to the ring electrode unit 200 located at the lowermost position, As shown in FIG.

In the above-described step 730, as a method of measuring the resistivity of the plurality of ring electrode units 200-1 to 200-N, i) a plurality of ring electrode units 200-1 to 200-N measures the resistivity all at once (Ii) a sequential measurement mode in which the resistivity is sequentially measured from the ring electrode unit 200-1 located on the upper side to the ring electrode unit 200-N located on the lower side, (iii) a plurality of ring electrode units 200- 1 to 200-N) can measure the resistivity in a mode such as an interval measuring mode in which the resistivity is measured at predetermined intervals (e.g., intervals of 30 minutes to 1 hour, etc.).

In one embodiment, in the case of the above-described interval measurement mode, it is possible to measure the resistivity value in accordance with the passage of time, thereby grasping the degree of material separation of each part according to the passage of time.

After the resistivity is measured in step 730, the measurement unit 300 connected to the ring electrode unit 200 reads out the material separation of the concrete through the respective resistivity values transmitted from the ring electrode unit 200 740).

The concrete material separation measuring method having the steps as described above may further include the step of measuring the ambient temperature at a temperature sensor installed in the inner space or the outside of the mold part before the step of reading the material separation state have.

Accordingly, in step 730, the temperature at which the material is separated from the concrete to be laid by receiving the temperature from the temperature sensor is stored as a database for each temperature, can do.

The concrete material separation measuring method having the steps as described above can measure the resistivity value according to the ratio of water, cement, aggregate and admixture material of concrete.

In general, the resistivity value is increased according to the aggregate content, and the content of the fine aggregate has a greater effect on the initial resistivity than the coarse aggregate. The use of the admixture in the same composition does not significantly affect the initial resistivity, Is also determined by the constitutional components of the material and the blending ratio.

In addition, the rising time and the condensation time are shortened with the increase of the aggregate content, and the use of the admixture (AE agent, fluidizing agent) that delays the agglomeration timing at the same mixing can be judged by the electrical resistivity measurement.

Fig. 8 is a flowchart for explaining the step of reading whether or not the concrete in Fig. 7 is separated from the material.

Referring to FIG. 8, first, the resistivity values transmitted from the ring electrode unit 200 in the measurement unit 300 are compared (741).

In one embodiment, the step 741 may sequentially compare the resistivity values transmitted from the ring electrode unit 200 located at the lowermost end from the resistivity values transmitted from the ring electrode unit 200 located at the uppermost end.

In one embodiment, the above-described step 741 is performed when the upper ring electrode portion 200 (for example, the ring electrode portion 200 has a total of ten ring electrode portions 200-1 to 200-10) (For example, the ring electrode unit 200-1 to the ring electrode unit 200-5) and the average value of the resistivity values transmitted from the ring electrode unit 200 The average value of the resistivity values transmitted from the ring electrode unit 200-6 to the ring electrode unit 200-10 can be compared when ten ring electrode units 200-1 to 200-10 are formed in total .

After comparing the resistivity values at step 741, the measuring unit 300 reads 742 the presence or absence of material separation of the concrete according to the respective resistivity values.

In the step 742 described above, the step of reading the material separation may read that the material separation has not occurred when the respective values of the resistances are within the error range, and read out that the material separation has occurred when the resistances are out of the error range.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

1: mold 100: mold part
110: main body 120:
130: Through hole 140: Sealing seal
200: ring electrode part 300: measuring part
310: connecting pin 320: connecting clip
330: Material separation measuring unit

Claims (15)

Preparing concrete in which water, cement, aggregate and admixture material are mixed;
Placing the concrete in a mold formed by vertically coupling a plurality of mold parts;
Measuring a specific resistance of the concrete poured in a plurality of ring electrode parts mounted on the inside of the mold part, respectively; And
And reading out whether or not the concrete is separated from the material through respective resistivity values transmitted from the ring electrode part in a measuring part connected to the ring electrode part.
The mold according to claim 1,
A cylindrical body; A seating protrusion protruding along the inner side of the body so as to seat the ring electrode unit on the inner side; And a through hole formed through one side of the main body.
3. The apparatus according to claim 2,
A first fastening protrusion protruding downward along a lower inner side to be fastened to an upper portion of another body; And a second fastening protrusion protruded upward along the upper side to fasten the lower part of the other body.
The ring resonator according to claim 1,
And the resistivity of the concrete material is measured at every position where it is touched.
The method of claim 1, wherein measuring the resistivity comprises:
Wherein all of the plurality of ring electrode units measure the resistivity all at once and then transmit the measured resistivity values collectively to the measurement unit.
The method of claim 1, wherein measuring the resistivity comprises:
Wherein the resistivity is sequentially measured from the ring electrode portion located on the upper side to the ring electrode portion located on the lower side, and then the measured resistivity values are sequentially transferred to the measuring portion.
The method of claim 1, wherein measuring the resistivity comprises:
Wherein the plurality of ring electrode units measure the resistivity at predetermined intervals and then transmit the measured resistivity values to the measurement unit at predetermined intervals.
The method of claim 1, wherein the step of reading whether the concrete is separated from the material comprises:
Comparing the respective resistivity values transmitted from the ring electrode unit in the measurement unit; And
And reading out the material of the concrete according to respective resistivity values in the measurement unit.
9. The method of claim 8, wherein comparing the resistivity values comprises:
Wherein a resistivity value transmitted from a ring electrode portion located at the uppermost stage is sequentially compared with a resistivity value transmitted from a ring electrode portion located at the lowermost stage.
9. The method of claim 8, wherein comparing the resistivity values comprises:
Wherein the average value of the resistivity values transmitted from the ring electrode portion located at the upper portion is compared with the average value of the resistivity values transmitted from the ring electrode portion located at the lower portion.
9. The method of claim 8,
And reading out that the material separation has not occurred when the respective resistivity values are within the error range, and reads out that the material separation has occurred when the respective resistances are outside the error range.
The method according to claim 1,
Further comprising the step of measuring an ambient temperature at a temperature sensor mounted on an inner space or an outer side of the mold section before the step of reading whether or not the material is separated.
13. The method of claim 12,
Wherein a rate at which material separation of the concrete to be placed is received by receiving the temperature from the temperature sensor is stored in a database for each temperature.
The method of claim 1, wherein preparing the concrete comprises:
Wherein the mortar and concrete are manufactured according to the mixing ratio of fine aggregate and coarse aggregate of 1: 1 or 1: 2 relative to the weight of cement in order to analyze the influence of the mixing ratio of aggregate.
15. The method of claim 14, wherein preparing the concrete comprises:
Wherein an AE agent and a fluidizing agent are added to show the influence of chemical admixture.

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