JP7092549B2 - Medium-fluidity concrete evaluation device and evaluation method of medium-fluidity concrete using it - Google Patents

Description

The present invention relates to a technique for evaluating medium-fluidity concrete.

As disclosed in Non-Patent Documents 1 and 2, the name "medium-flow (lining) concrete" is defined by NEXCO Research Institute, Ltd., and is also used for technical proposals, and is used by the Ministry of Land, Infrastructure, Transport and Tourism. Increasingly, it is also applied to other mountain tunnels.
Medium-fluidity concrete can be filled solidly by applying vibration as an auxiliary during driving and performing slight compaction. Therefore, it is applied to various uses including the use as tunnel lining concrete.

NEXCO test method Vol. 7 Tunnel-related test method July 2013, 6th edition (P43-P46) NEXCO Tunnel Construction Management Guidelines July 2013 7th Edition (P38-P47)

However, for medium-fluidity concrete, although the number of constructions using the concrete has increased since around 2008, the degree of "minor compaction" has not yet been established, so it is possible to make a thorough construction plan. The current situation is that it is difficult.
Here, conventionally, the degree of compaction of concrete with slump is evaluated by performing a slump test in the container of the slump test device and evaluating the vibration energy until the sample is compacted to the theoretical density by vibration as "compacting completion energy". ing.
On the other hand, compaction of medium-fluidity concrete can be evaluated by the compaction completion energy, but since medium-fluidity concrete has a large slump, almost no change in slump is observed before and after vibration during the slump test. .. Therefore, it is difficult to measure the compaction completion energy of medium-fluidity concrete using the existing slump test equipment.
Therefore, the present invention has been made focusing on such a problem, and is a medium-fluidity concrete evaluation device suitable for quantitative evaluation of the construction performance of medium-fluidity concrete and a medium-fluidity concrete using the same. The subject is to provide an evaluation method for concrete.

In order to solve the above problems, the medium-fluidity concrete evaluation device according to one aspect of the present invention inputs the longitudinal vibration to the medium-fluidity concrete as a sample to limit the longitudinal vibration, and the vibration energy required for compaction of the sample. Is characterized by being configured to be quantitatively measurable.
Here, in the medium-fluidity concrete evaluation device according to one aspect of the present invention, a base, a table provided on the base on which a horizontal mounting surface is formed, and the table are orthogonal to the above-mentioned mounting surface. A vibration table equipped with a vibration unit equipped to input only longitudinal vibration in the direction of the table, a slump flow tester provided replaceably on the mounting surface of the table, and mounting of the table. It is preferable to provide a U-shaped filling tester provided on the table surface so as to be replaceable.

Further, in the medium-fluidity concrete evaluation device according to one aspect of the present invention, a base, a table provided on the base on which a horizontal mounting surface is formed, and the table described above are orthogonal to each other. A vibration table equipped with a vibration unit equipped to input only longitudinal vibration in a direction, and a slump flow tester or a U-shaped filling tester provided replaceably on the mounting surface of the table. , Is preferred.
According to the medium-fluidity concrete evaluation device according to one aspect of the present invention, the vibration energy required for compaction of the medium-fluidity concrete at that time is quantified by inputting a limited longitudinal vibration to the medium-fluidity concrete as a sample. Can be measured. Therefore, it is suitable for quantitative evaluation of the construction performance of medium-fluidity concrete.

Further, in order to solve the above-mentioned problems, the medium-fluidity concrete evaluation method according to one aspect of the present invention uses the medium-fluidity concrete evaluation device according to any one aspect of the present invention, and the medium-flow concrete as a sample. It is characterized by quantitatively evaluating the construction performance of concrete.
According to the compounding selection method for medium-fluidity concrete according to one aspect of the present invention, the construction performance of the medium-fluidity concrete as a sample is quantitatively measured by using the medium-fluidity concrete evaluation device according to any one aspect of the present invention. Therefore, it is possible to define a desirable vibration energy for compaction of medium-fluidity concrete, and it is possible to provide an evaluation method of medium-fluidity concrete that contributes to the formulation of a complete construction plan.

As described above, according to the present invention, the construction performance of medium-fluidity concrete can be quantitatively evaluated.

It is a perspective view which shows one Embodiment of the medium-fluidity concrete evaluation apparatus which concerns on one aspect of this invention, FIG. FIG. 3C is a diagram showing a state in which a U-shaped filling tester is placed on a vibration table. It is explanatory drawing of the vibration table of the medium-fluidity concrete evaluation apparatus of FIG. 1, FIG. 1A is a front view thereof, and FIG. It is a graph which shows the relationship between time and acceleration when the vibration part of the medium-fluidity concrete evaluation apparatus of FIG. 1 is driven and is vibrated. It is explanatory drawing of the slump flow tester which is replaceably provided on the mounting surface of a table of the medium-fluidity concrete evaluation apparatus of FIG. 1, and FIG. (B) shows an image of a state in which the medium-fluidized concrete as a sample is spread out by pulling out the slump cone. FIG. 1 is an explanatory view of a U-shaped filling tester which is replaceably provided on a table mounting surface of the medium-fluidity concrete evaluation device of FIG. 1, where FIG. 1A is a plan view and FIG. 1B is a front view. be. FIG. 5 is an explanatory diagram of a vibration filling test using a U-shaped filling tester shown in FIG. 5, in which FIG. 5A shows an image of a state before vibration and FIG. 5B shows an image of a state after vibration. There is. In the slump flow tester shown in FIG. 4, it is a graph showing the relationship between the flow displacement and time when the medium-fluidity concrete is housed in the slump cone, when the slump cone is pulled out, and when vibration is performed thereafter. .. It is a graph which shows the test result using the medium-fluidity concrete evaluation apparatus of FIG. 1, FIG. Same as above). It is a graph which shows the test result using the medium-fluidity concrete evaluation apparatus of FIG. It is a graph which shows the test result using the medium-fluidity concrete evaluation apparatus of FIG. It is a graph which shows the test result using the medium-fluidity concrete evaluation apparatus of FIG. It is a graph which shows the relationship between the flow 600mm arrival time at the time of vibration when using a slump flow tester, and the filling time at the time of vibration at the time of using a U type filling tester. It is explanatory drawing of another embodiment of the medium-fluidity concrete evaluation apparatus which concerns on one aspect of this invention, FIG. -Z sectional view, (c) is a right side view of the vibration section in (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings. Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of constituent parts. Etc. are not specified in the following embodiments.

The medium-fluidity concrete evaluation device of the present embodiment is an apparatus for quantitatively evaluating the construction performance of medium-fluidity concrete, and as shown in FIG. 1, the medium-fluidity concrete evaluation device 100 (hereinafter referred to as “medium-fluidity concrete evaluation device 100”). , Simply referred to as an "evaluation device") includes a vibration table 50 and testers 30 and 40 mounted on the vibration table 50.
In particular, the vibration table 50 of the present embodiment has a uniaxial vibration device 20 having a single-axis hanging type vibration motor as a vibration unit. The uniaxial vibration device 20 is hung from the lower surface of the table 10 so as to input the longitudinal vibration to the table 10 in the direction orthogonal to the mounting surface 11 in a limited manner.

Then, the evaluation device 100 of the present embodiment uses the testers 30 and 40 for the medium-fluidity concrete as a sample, and the table 10 is driven by the uniaxial vibration device 20 of the vibration table 50 in the state of fresh concrete. The vibration energy required for compaction of the sample at the time of vibration can be quantitatively measured by inputting only the longitudinal vibration to.
Specifically, as shown in FIG. 2, the vibration table 50 includes a base 1, a table 10, and a uniaxial vibration device 20. The table 10 is provided on the base 1 as a vibrating table supported by four mount rubbers 2, and the upper surface of the table 10 is a horizontal mounting surface.

In the vibration table 50 of the present embodiment, the influence of the difference in the weight of the sample and the weights of the testers 30 and 40 placed on the table 10 between the base 1 and the table 10 on the measurement result is minimized. Has sufficient rigidity for this. The upper surface of the table 10 is horizontally supported as a mounting surface 11 of a rectangular (square in this example) in a plan view. The mounting surface 11 has a size of 1000 mm × 1000 mm as a size required as a shaking table for measuring the slump flow of medium-fluidity concrete.
An acceleration sensor 3 is provided at the position of the lower center of the table 10. The acceleration sensor 3 is provided so that the slump flow tester 30 is placed on the table 10 and the acceleration when the longitudinal vibration is limitedly input to the table 10 can be measured. The detection signal of the acceleration sensor 3 is input to the computer 60 via the signal line.

As the computer 60, for example, a personal computer is used, and the uniaxial vibration device 20 is configured to be able to execute the start processing and the evaluation processing program by the evaluation device 100. The computer 60 has a timer, and can measure the elapsed time from the start of the uniaxial vibration device 20 by synchronizing the start signal of the vibration motor of the uniaxial vibration device 20 with the output signal of the acceleration sensor 3. There is.
Here, the start-up time of the vibration motor of the uniaxial vibration device 20 greatly affects the accuracy of the measurement data. Therefore, it is preferable to minimize the start-up time of the vibration exciter motor. Further, in order to minimize the rolling of the table 10, it is preferable to adopt a uniaxial vibration device 20 having a single-axis hanging type vibration vibration motor as in the present embodiment.

On the other hand, in the vibration table 50 of the present embodiment, as shown in FIG. 2, the uniaxial vibration device 20 has a support shaft 21 horizontally stretched on the table side and a base end with respect to the support shaft 21. It includes a pair of hanging arms 22 whose portions are rotatably hung, and a vibration motor 23 provided at the tip of the pair of hanging arms 22 in a hanging posture. As a result, when the vibration motor 23 of the uniaxial vibration device 20 is driven, the vibration table 50 of the present embodiment is swiftly limited to the vertical direction while the upper surface of the table 10 is kept horizontal by the uniaxial vibration. It is designed to vibrate.

The graph shown in FIG. 3 shows the relationship between the amplitude (acceleration) of the upper surface of the table 10 and the time acquired by the acceleration sensor 3 when the uniaxial vibration device 20 of the present embodiment is driven. As can be seen from the figure, according to the vibration table 50 of the present embodiment, when the vibration motor 23 of the uniaxial vibration device 20 is driven, the upper surface of the table 10 can be vibrated quickly only in the vertical direction. can.
Further, the evaluation device 100 of the present embodiment is provided with a replaceable slump flow tester 30 on the mounting surface 11 of the table 10 of the vibration table 50 and a replaceable on the mounting surface 11 of the table 10. The U-shaped filling tester 40 is provided with the U-shaped filling tester 40.

As shown in FIG. 4, the slump flow tester 30 has a slump cone having a predetermined shape specified in JIS A1101 (2005) (see Non-Patent Document 1 above). Since the test method conforms to the concrete slump test method specified in the same standard except for the matters specified in the present specification, detailed description thereof will be omitted (see Non-Patent Document 1 above).
In the figure, when the sample F is housed in the slump cone, the top surface diameter A = φ10 cm, the bottom surface diameter B = φ20 cm, and the height H = 30 cm. The sample height dropped when the slump cone was pulled out from the state of FIG. 1A and the sample F spread was the slump value S, and the spread of the diameter φ on the mounting surface 11 was the slump flow value W. (JIS A 1150).

In the present embodiment, a laser measuring instrument (not shown) mounted so as to be able to irradiate a laser along the mounting surface 11 is attached around the table 10 of the vibration table 50, and a slump is provided by this laser measuring instrument. The flow value can be measured automatically. In the present embodiment, the controller of the laser measuring instrument is configured to be capable of measuring the slump flow value W by, for example, an 8-point averaging method, and the measured slump flow value W is input to the computer 60. ..

Further, as shown in FIG. 5, the U-shaped filling tester 40 is a substantially U-shaped box-shaped container, and has chambers A and B partitioned to the left and right by a central partition plate. The box-shaped container is held on the mounting surface 11 by a holding frame 41 having a rectangular frame shape shown by a two-dot chain line in the figure so that the container can be mounted in a stable posture. A connecting passage connecting chambers A and B is formed at the lower part of the partition plate, and this connecting passage can be opened and closed by inserting and removing the partition gate in the vertical direction.

In the filling property (gap passage property) test, as shown in FIG. 6, first, with the partition gate closed, the sample F is filled in the chamber A based on a predetermined step. Next, the partition gate is opened at once, and the time and the filling height until the sample F flows and moves from the A chamber to the B chamber and the filling into the B chamber is stopped are measured. Since the details of the test method using the U-shaped filling tester 40 are based on the concrete filling property test method specified in Non-Patent Document 1 except for the matters specified in the present specification, detailed description thereof will be omitted.

In the present embodiment, a laser measuring instrument (not shown) mounted on the upper part of the holding frame 41 so as to be capable of laser scanning from above the B chamber of the U-shaped filling tester 40 into the B chamber is attached, and the laser measuring instrument is used. , The filling height in chamber B can be automatically measured. In the present embodiment, the controller of the laser measuring instrument is configured to be able to measure the filling height from the average value obtained by laser scanning, and the measured filling height is input to the computer 60.

Next, an evaluation method for medium-fluidity concrete using the evaluation device 100 will be described.
In the evaluation method of the medium-fluidity concrete of the present embodiment, the evaluation device 100 is used, and the medium-fluidity concrete as a sample is input to the table 10 of the vibration table 50 in the state of fresh concrete with limited longitudinal vibration. However, it quantitatively evaluates the construction performance of the medium-fluidity concrete as a sample at the time of vibration.
In the present embodiment, in the slump flow test, as shown in FIG. 1 (b), the slump flow tester 30 is used to drive the uniaxial vibration device 20 of the vibration table 50 to cause longitudinal vibration on the table 10. Input only, and measure the time required for the slump flow value W of the medium-fluidity concrete to reach 600 mm at the time of vibration.

At this time, visually confirm that the concrete does not separate until the slump flow of the medium-fluidity concrete reaches 600 mm. Unlike slump concrete, medium-fluidity concrete is not judged by the energy at which the degree of compaction becomes 100%, but the state in which it can be judged that the compaction has been sufficiently completed without separation is regarded as the completion of compaction.
Here, high-fluidity concrete having a slump flow of 600 mm or more can be determined to be self-filling concrete. Therefore, it can be inferred that the self-filling property can be sufficiently exhibited when the medium-fluidized concrete receives the vibration energy and the slump flow becomes about 600 mm.

As shown in FIG. 7 as an example of measurement results for four samples (flow displacements 1 to 4), if the medium-fluidity concrete evaluation device 100 of the present embodiment is used, the slump cone is filled with the samples (measurement in the figure). The process of pulling out the cone (from about 17 seconds to about 39 seconds in the figure) and then expanding the flow displacement by uniaxial vibration (from the start to about 17 seconds later). (Timekeeping after about 40 seconds in the figure) can be measured in detail.
In the present embodiment, the vibration energy when the slump flow reaches 600 mm is measured and used as the compaction completion energy of the medium-fluidity concrete. The degree of compaction of concrete can be calculated by the following formula. In this embodiment, the compaction completion energy and the compaction completion energy of the medium-fluidity concrete are defined as follows.
Compaction degree γ = initial flow value (mm) ÷ 600 (mm) × 100 (%)

Further, in the present embodiment, in the U-shaped filling test, as shown in FIG. 1 (c), the U-shaped filling tester 40 is placed on the mounting surface 11 of the table 10 and the holding frame 41 is fixed. , The uniaxial vibration device 20 of the vibration table 50 is driven to input the longitudinal vibration to the table 10 in a limited manner, and the time required for the filling height in the chamber B to reach 300 mm and 350 mm at the time of vibration is measured. do. The filling height is measured by the above laser measuring device. Also, visually confirm that the concrete does not separate by the time the filling height reaches 300 mm and 350 mm.
Hereinafter, the results of a plurality of evaluation tests (first to fourth evaluation tests in this example) of medium-fluidity concrete carried out using the medium-fluidity concrete evaluation device 100 of the present embodiment will be described together with consideration. Table 1 shows the formulations of the four types of samples used in the first to fourth evaluation tests.

[First evaluation test]
In the first evaluation test, the evaluation device 100 was used to make the amount of coarse aggregate constant (330 liters constant) and the composition constant as the four types of medium-fluidity concrete as samples shown in Table 1, and the amount of admixture was constant. 8 (a) and 8 (b) show the test data in each case when the initial slump flow is 350 mm, 400 mm, 450 mm and 500 mm.
In the first evaluation test, as shown in FIG. 8, in the medium fluid concrete, when the amount of the admixture is adjusted to increase the initial slump flow, the fluidity is improved, as can be seen from FIG. 8 (a). As shown in FIG. 3B, it can be seen that even if the amount of the admixture is adjusted to increase the initial slump flow, the effect on the gap passage property is small.

[Second evaluation test]
In the second evaluation test, the evaluation device 100 was used to make the amount of coarse aggregate constant, the slump flow 400 mm constant, and the water-cement ratio as the four types of medium-fluidity concrete as samples shown in Table 1. When the ratio was kept constant at 50%, the unit water amount W was changed to 155, 160, 165, 170, 175 kg by adjusting the fine aggregate ratio and the amount of the admixture. The test data in this case are shown in FIGS. 9 (a) and 9 (b).
In the second evaluation test, as shown in the figure, even if the slump flow is the same, as shown in FIG. You can see that. Therefore, special attention should be paid to the relationship between the unit water volume and the ability to pass through gaps when selecting the composition of medium-fluidity concrete.

[Third evaluation test]
In the third evaluation test, the evaluation device 100 was used, and the amount of coarse aggregate was constant, the slump flow was constant at 400 mm, and the unit water volume was constant at 165 kg as the four types of medium-fluidity concrete as samples shown in Table 1. Occasionally, the fine aggregate ratio and the amount of admixture were adjusted to change the water-cement ratio W / C to 40%, 50% and 60%, respectively. Each test data in this case is shown in FIGS. 10 (a) and 10 (b).
In the third evaluation test, it can be seen that in the medium-fluidity concrete, as shown in FIG. 10, the gap passage property is improved by reducing the water-cement ratio. This is considered to be the effect of increasing the unit powder amount.

[Fourth evaluation test]
In the fourth evaluation test, the evaluation device 100 was used, and as the four types of medium-fluidity concrete as samples shown in Table 1, the slump flow was constant at 400 mm, the unit water volume was constant at 165 kg, and the water-cement ratio was constant. When W / C = 50% was constant, the fine aggregate ratio and the amount of admixture were adjusted to change the unit coarse aggregate amount to 280, 300 and 330 liters. The test data in this case are shown in FIGS. 11 (a) and 11 (b).
In the fourth evaluation test, as shown in FIG. 11, it can be seen that the interstitial passage property of the medium-fluidity concrete is lowered by increasing the blending amount of the coarse aggregate. In particular, it can be seen that when the blending amount of the coarse aggregate exceeds 330 liters, the degree of deterioration of the gap passage property tends to increase.

As described above, according to the medium-fluidity concrete evaluation device 100 of the present embodiment, the vibration energy required for compacting the medium-fluidity concrete by inputting only the longitudinal vibration to the medium-fluidity concrete as a sample. Can be measured quantitatively. Then, according to the evaluation device 100 and the evaluation method using the evaluation device 100, the construction performance of the medium-fluidity concrete as a sample can be quantitatively evaluated.
Further, the medium-fluidity concrete evaluation device 100 of the present embodiment can be used to define desirable vibration energy for the medium-fluidity concrete, thereby providing an evaluation method for the medium-fluidity concrete that contributes to the formulation of a complete construction plan. For example, it is possible to select a composition of medium-fluidity concrete whose construction performance is quantitatively evaluated.

For example, using the evaluation device 100, the time required for the slump flow of the medium-flow concrete subjected to vibration on the mounting surface 11 of the vibration table 50 to reach the planned slump flow of 600 mm, and the U-shaped filling test. FIG. 12 shows the results when the time required for the filling height at the time of vibration to reach 350 mm in the U-shaped filling test using the vessel 40 is the same.
As shown in the figure, when selecting the composition of medium-fluidity concrete, in the state of fresh concrete, the slump flow using the slump flow tester 30 under vertical vibration is 600 mm, and the slump flow is 600 mm under the same vibration. It is preferable to select the concrete composition so that the vibration energy at which the U-shaped filling height of the U-shaped filling tester 40 is 350 mm is the same as that of the U-shaped filling tester 40.

In particular, according to the medium-fluidity concrete evaluation device 100 of the present embodiment, as shown in FIG. 3, since the vibration acceleration and the frequency are substantially constant, the compaction energy can be evaluated by the compaction time. Therefore, it is suitable for evaluation of medium-fluidity concrete.
The medium-fluidity concrete evaluation device according to the present invention and the evaluation method for the medium-fluidity concrete using the same are not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. Of course there is.

For example, in the above-described embodiment, the uniaxial vibration device 20 that hangs downward from the lower surface of the table 10 and is supported so as to be swingable has been described as an example of the configuration of the vibration unit, but the present invention is limited to this. is not.
For example, as shown in FIG. 13 as another embodiment of the vibrating section, the biaxial vibrating device 20 has a support shaft 21 horizontally stretched on the back surface of the table 10 and the upper end thereof rotates on the support shaft 21. It has a pair of hanging arms 22 that are freely supported, and a vibration portion housing 29 is fixed to the lower ends of the pair of hanging arms 22.

A drive motor 24 is provided on the upper surface side of the vibration portion housing 29, and a pair of eccentric weights 27A and 27B for vibration are provided at both ends of the vibration shaft 26 below the vibration portion housing 29. A shaking body 28 is provided. The drive motor 24 and the exciter 28 are connected so that the drive force can be transmitted via the belt type speed reducer 25. The pair of eccentric weights 27A and 27B are adjustable in phase with each other. By adjusting this phase difference, it is possible to change the direction of the vibrations that are offset. In the present embodiment, the phase difference is set so as to cancel all except the vibration in the vertical direction.
As a result, according to the biaxial vibration device 20 shown in the figure, when the drive motor 24 is driven, the pair of eccentric weights 27A and 27B for vibration cancel out vibrations in directions other than the vertical direction. Therefore, the vertical vibration can be input to the table 10 only.

1 Base 2 Mount rubber 3 Accelerometer 10 Table 11 Mounting surface 20 Uniaxial vibration exciter (vibration part)
30 Slump flow tester 40 U-type filling tester 50 Vibration table 60 Computer 100 Medium-fluidity concrete evaluation device F Medium-fluidity concrete sample

Claims (6)

It is a medium-fluidity concrete evaluation device that is configured to quantitatively measure the vibration energy required for compaction of the sample by inputting only the longitudinal vibration to the medium-fluidity concrete as a sample.
A base, a table provided on the base on which a horizontal mounting surface is formed, and a vibration equipped to input the vertical vibration to the table in a direction orthogonal to the above-mentioned mounting surface. With a vibration table having a part,
A replaceable slump flow tester on the mounting surface of the table,
A U-shaped filling tester provided on the mounting surface of the table so as to be replaceable,
A medium-fluidity concrete evaluation device characterized by being equipped with. It is a medium-fluidity concrete evaluation device that is configured to quantitatively measure the vibration energy required for compaction of the sample by inputting only the longitudinal vibration to the medium-fluidity concrete as a sample.
A base, a table provided on the base on which a horizontal mounting surface is formed, and a vibration equipped to input the vertical vibration to the table in a direction orthogonal to the above-mentioned mounting surface. With a vibration table having a part,
A slump flow tester and a U-shaped filling tester provided on the mounting surface of the table so as to be selectively substituted with each other ,
A medium-fluidity concrete evaluation device characterized by being equipped with. The medium-fluidity concrete evaluation device according to claim 1 or 2 , wherein the vibrating section is a uniaxial vibrating device that is swayably supported while hanging downward from the lower surface of the table. The medium-fluidity concrete evaluation according to claim 1 or 2 , wherein the vibration-exciting unit is a biaxial vibration device mounted in a state of being hung from the lower surface of the table so as to input only longitudinal vibration to the table. Device. When the slump flow tester is placed on the table, a sensor provided so as to be able to measure the slump flow of medium-fluidity concrete as a sample when the longitudinal vibration is limitedly input to the table.
A timer that measures the elapsed time from the activation of the vibration unit in synchronization with the activation signal of the vibration unit and the sensor, and
The medium-fluidity concrete evaluation device according to any one of claims 1 to 4 . Using the medium-fluidity concrete evaluation device according to any one of claims 1 to 5 , input only vertical vibration in the state of fresh concrete to the medium-fluidity concrete as a sample, and use the medium as a sample. An evaluation method for medium-fluidity concrete, which is characterized by quantitatively evaluating the construction performance of fluidized concrete.

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