KR20180028082A - Lightweight apparatus for measuring consistency of fresh concrete and Method for measuring consistency of fresh concrete using the same - Google Patents

Abstract

The present invention relates to an apparatus for measuring consistency of fresh concrete, which is capable of quantifying a sticky degree of dough of fresh concrete, that is consistency, used for manufacturing factories such as pre-cast high-strength concrete (PHC) piles, poles, sleepers, box culverts, hume pipes, channels, and the like as well as general concrete for construction/civil engineering structures, and allowing quantitative measurement, and to a method for measuring consistency of fresh concrete using the same. The apparatus for measuring consistency of fresh concrete comprises: a lower plate; an upper plate; an elastic support installed between the upper and lower plates such that the upper plate is spaced apart in parallel with the lower plate; a cylindrical container coupled to an upper surface of the upper plate such that an opening portion faces upward; a vibration motor coupled to a lower surface of the upper plate (20) to induce vibration in the upper plate; a rubber support coupled to a lower surface of the lower plate; a transparent disc having an outer diameter with a size corresponding to an inner diameter of the container and placed on fresh concrete in the container formed with a plurality of through-holes at regular intervals on a surface thereof; a display unit for displaying a driving time of the vibration motor; and a foot switch for controlling driving of the vibration motor.

Description

Technical Field [0001] The present invention relates to a method for measuring the consistency of a non-hardened concrete and a method for measuring the consistency of the uncured concrete using the same.

The present invention relates to concrete for civil construction and civil engineering structures, as well as high strength concrete piles (PHC files), pole, sleeper, box culvert, hume pipe ), A water channel, and the like, which can quantitatively quantify the kneading of the unhardened concrete, that is, the consistency, and a non-hardened concrete using the same To a method for measuring the consistency of a signal.

As a conventional method for measuring the consistency of unhardened concrete, there is KS F 2427 "Test method for unbonded concrete kneading test ", and a test apparatus for carrying out the test is as shown in [Reference 1] below.

[Reference Figure 1]

A specific test method using the test apparatus of [Reference Fig. 1] is as follows.

① Place the kneader horizontally, hold the container (A) with the nut on the shaking table (G), put the mold (B) moistened in the container (A), and then place the funnel (D) on the mold.

② Next, fill the mold (B) with funnel (D) through the funnel (K) and fill the mold with the compaction rod, align the upper surface of the concrete with the upper surface of the mold (B) Place the disc (C) and then start the vibrator.

③ Finally, measure the time from the start of vibration to the point where the mortar touches the whole surface of the transparent disc (C) where the concrete is built up by the vibrator.

There are five problems in KS F 2427 "Test method for unbonded concrete kneading test" as above.

First, when the specimen (unstifted concrete) collapses due to vibration, it is often tilted in one direction, so that the time taken for the transparent panel to completely wet by the mortar is not influenced only by the actuality of the concrete of the test specimen. The result is poor reliability. In particular, concrete for PHC pile is formed by centrifugal molding with almost no fluidity, unlike ordinary concrete, which requires a certain level of fluidity to fill a closed chamber in a formwork, so that the specimen (unset concrete) It is difficult to expect KS F 2427 test method for PHC pile concrete.

Second, there are a lot of inconveniences in operating the equipment to implement the KS F 2427 method. The vibrator is operated to measure the time from the start of vibration to the moment when the mortar contacts the entire surface of the transparent disk with the concrete being compacted by the vibrator. One person performs the vibrator operation and the transparent disk (C) observation at the same time At least two people are required to participate in the test.

Third, the criterion of "the time when the mortar touches the entire surface of the transparent disc (C)" is ambiguous, and there is a possibility that the supervisor can intervene. That is, it is difficult to visually distinguish between the state in which the transparent disc is wetted by the mortar separated from the coarse aggregate by vibration and the state in which the concrete is in contact with the unhardened concrete before the mortar separation, and the test result may be different depending on the observer's subjective opinion have.

Fourth, it is recommended that the untreated concrete is tested immediately at the site of concrete mixing, but conventional equipment has been used only in laboratories because it is difficult to move heavy and heavy.

Fifth, KS F 2427 method is to fill the mold (slump cone) with unhardened concrete and then proceed after finishing. This is to measure the consistency of the concrete under test at a constant volume. However, since the specific gravity of aggregate, binder, and water constituting concrete is different, the specific gravity of concrete varies depending on the composition ratio of the above components, and the weight of concrete having the same volume is different. Therefore, KS F 2427 method has difficulty in obtaining accurate relative comparison data and accumulation of concrete with different specific gravity.

On the other hand, Japanese Patent Publication No. 2636176 (hereinafter referred to as "Prior Art 1") describes a method of filling a container with a solid concrete, inserting an internal vibration member (vibrator) into the concrete, And a moving means for moving a longitudinal concrete container and an internal vibration member (vibrator) provided above and below the center of the concrete container so as to be movable up and down to a predetermined depth from the outside of the concrete container, The concrete test apparatus of the present invention is characterized in that the concrete test apparatus is provided with a concrete test apparatus. [Refer to Fig. 2] below is a concrete consistency test apparatus of Prior Art 1.

[Reference Figure 2]

1: The Bottom 2: Mold guide 3: container 4: vibrator

5: between oscillation 6: Support member 7: Support arm 8: Driving roller

9: Guide rail 10: Side column 11: 12: guide roller

13: Balance weight 14: Stopper

The above prior art 1 is configured to insert vibrations 5 into a non-hardened concrete in order to provide an apparatus and a method for measuring concrete consistency by a simple operation. However, the measurement of the consistency by direct vibration in concrete after concrete pouring is excessive from KS which applies vibration to the vessel.

Japanese Unexamined Patent Publication No. 63-165756 (hereinafter referred to as "Prior Art 2") describes a method in which a predetermined amount of unhardened concrete is placed in a container, a pressing member having a plurality of electrodes dispersedly disposed thereon is placed thereon, And measuring the time at which the occurrence of bleeding on the upper surface of the concrete is detected by a predetermined number of electrodes from the start of the vibration, thereby measuring the consistency of the concrete. [Refer to Fig. 3] below is a concrete consistency measurement apparatus of Prior Art 2.

[Reference Figure 3]

1: Concrete 2: container 3: expectation 4: Shake table

6: Cancer 7: Column 8: 9:

10: Splitting 13: Control device 15: Indicator 16: Display

In the prior art 2 described above, the motion of the device due to the vibration applied to the shaking table 4 is configured to be held by the weight of the base 3, and an electrode is attached to the pressing member 10 And the time at which the occurrence of bleeding on the upper surface of the concrete is detected by a predetermined number of electrodes is measured from the start of vibration. However, if the direct contact between the electrode and the bleeding is repeated, the cement particles are caught in the electrode forming space to form the latency, so that the electrode can not function and the life of the pressing member is shortened. Even if the pressure member is washed after the test, there is a limit to the removal of the cement particles deeply penetrating into the electrode forming space.

[Reference Figure 4]

8a: center hole Aa, Ab, Ac to Fa, Fb, Fc: Electrode

1, Japanese Patent Publication No. 2636176 2. Japanese Unexamined Patent Publication No. 63-165756 3. Korean Patent No. 0953942

1. KS F 2427 "Test method for unbonded concrete dough"

An object of the present invention is to provide a lightweight, non-hardened concrete lightweight measuring device which is lightweight and easy to test so that one person can carry and test a concrete compounding site while carrying it.

It is another object of the present invention to provide a method for measuring the continuity of concrete without increasing the reliability of the test results and to derive the consistency comparison data on the basis of the same weight for unconfined concrete having different specific gravity.

The present invention relates to " Top plate; An elastic strut installed between the upper and lower plates such that the upper plate is spaced apart from and parallel to the lower plate; A cylindrical container coupled to an upper surface of the upper plate such that an opening thereof faces upward; A vibration motor coupled to a lower surface of the top plate to cause vibration of the top plate; A rubber pedestal coupled to a lower surface of the lower plate; A transparent circular plate having an outer diameter of a size corresponding to an inner diameter of the container and placed on the unreinforced concrete in the container in which a plurality of through holes are regularly formed on the plate surface; A display unit for displaying the driving time of the vibration motor; And a foot switch for controlling driving of the vibration motor; Quot ;, " an apparatus for measuring the weight of a concrete without solidification "

The elastic strut may be provided with a load cell for sensing the weight of the upper portion, and the display unit may be configured to display the weight measured by the load cell.

The display unit may include a storage battery for supplying power for driving the vibration motor. In this case, the display unit and the foot switch are configured to transmit and receive a signal through the short-range wireless communication means, and to transmit the On / Off signal of the vibration motor input to the foot switch to the vibration motor via the display .

By using such an apparatus, it is possible to (a) fill the container with a predetermined amount of uncured concrete; (b) placing the transparent disc on a non-hardened concrete filled in a container; And (c) driving the vibration motor to measure the time during which the mortar escapes from the unreinforced concrete over the entire through-holes of the transparent disc or over a predetermined and predetermined number of apertures; The method for measuring the continuity of unhardened concrete can be implemented.

In addition, the present invention provides a device for measuring the lightness of a non-solid concrete consistency, comprising: a support coupled to a side of the lower plate; An arm coupled at one end to the support and configured to pivot horizontally about the support; And a pressing rod coupled to the other end of the arm in a vertical direction to move up and down in a linear motion, the lower end being connected to the center of the transparent disc; As shown in FIG.

In this case, a method of measuring the unconstrained concrete consistency comprises the steps of: (a) filling the container with a predetermined amount of uncured concrete; (b ') lowering said pressure bar to contact said transparent disc with uncured concrete in said container; And (c) driving the vibration motor to measure the time during which the mortar escapes from the unreinforced concrete over the entire through-holes of the transparent disc or over a predetermined and predetermined number of apertures; .

According to the present invention, there is provided an apparatus for measuring the lightness of a non-hardened concrete and a method for measuring the continuity of the unhardened concrete.

1. As the weight of the device is reduced, the unconsolidated concrete can be measured directly at the concrete site.

2. One person can use the foot switch to turn on / off the vibration motor and observe the unconfined concrete in the container.

3. The criteria for measuring the consistency of unhardened concrete are set as to whether or not the mortar escapes through a plurality of regularly formed through holes in the transparent disc, thereby minimizing the possibility of intervention of the observer's attention, thereby enhancing the reliability of the test result .

4. By attaching the load cell to the elastic strut, concrete of a certain weight can be filled in the container without separate weighing, so that the consistency of unhardened concrete with different specific gravity can be measured and compared on the basis of the same weight.

FIG. 1 shows a first embodiment of a device for measuring the lightness of a non-solid concrete concrete state provided by the present invention.
FIG. 2 illustrates an embodiment of a transparent disc according to the present invention.
FIG. 3 shows a second embodiment of the apparatus for measuring the lightness of the concrete of the unhardened concrete provided by the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

The present invention relates to " a bottom plate (10); An upper plate 20; An elastic strut (30) installed between the upper and lower plates (20, 30) such that the upper plate (20) is spaced apart in parallel with the lower plate (10); A cylindrical container 40 coupled to an upper surface of the top plate 30 such that an opening thereof is directed upward; A vibration motor (50) coupled to a lower surface of the top plate (20) to cause vibration of the top plate (20); A rubber pedestal 60 coupled to a lower surface of the lower plate 10; A transparent disc 70 having an outer diameter of a size corresponding to the inner diameter of the container 40 and placed on the unreinforced concrete in the container 40 in which a plurality of through holes 71 are regularly formed on the surface of the container 40; A display unit 80 for displaying the driving time of the vibration motor 50; And a foot switch (90) for controlling driving of the vibration motor (50); (Hereinafter referred to as " present invention apparatus ") (refer to Fig. 1).

The lower plate 10 and the upper plate 20 are plate-shaped members, and are disposed in parallel to each other by the elastic pillars 30. [ That is, the elastic strut 30 is installed such that the lower end of the elastic strut 30 is coupled to the lower plate 10 and the upper end of the elastic strut 30 supports the upper plate 20. By providing three to four elastic supports 30, the top plate 20 can be stably and efficiently supported. The elastic struts 30 can be formed in a spring shape as shown in FIG.

The container 40 is a cylindrical member which is coupled to an upper surface of the top plate 20 so that the opening faces upward. The container 40 is filled with an uncured concrete specimen. Therefore, the container 40 should be made of a watertight material.

The vibration motor 50 is attached to a lower surface of the top plate 20 to cause vibration of the top plate 20. [ This vibration induces the mortar to float in the uncured concrete which is filled in the container (40). At this time, the elastic strut 30 also effectively prevents the vibration generated by the vibration motor 50 from being transmitted to the top plate 20, while preventing the device according to the present invention from being conducted by vibration do.

However, since the apparatus of the present invention is a lightweight device, overall movement can be caused by the vibration generated in the vibration motor 50 despite the action of the elastic strut 30. Therefore, the entire movement of the apparatus of the present invention can be prevented by attaching the rubber pedestal 60 having a large frictional force to the lower surface of the lower plate 10.

The transparent disc 70 is a member having an outer diameter of a size corresponding to the inner diameter of the container 40 and having a plurality of through holes 71 regularly formed on the surface thereof. When the vibration motor 50 is driven in a state in which the non-hardened concrete is filled in the container 40, the coarse aggregate and the mortar are separated by the vibration, and the mortar floats upward. Therefore, when the vibration motor 50 is driven in a state in which the transparent disc 70 is placed on the non-hardened concrete, the mortar slips over the transparent disc 70 through the through hole 71 as shown in FIG. 2 And the moment when the mortar escapes from the through hole 71 can be visually confirmed easily.

As shown in FIG. 2, the transparent disc 70 may have two through-holes arranged at regular intervals in four directions. Accordingly, if the concrete is filled in the container 40 and the vibrating motor 50 is driven to discharge all the eight through holes 71 or the predetermined number of through holes 71, 50 can be stopped and the driving time of the vibration motor 50 can be grasped.

The display unit 80 displays the driving time of the vibration motor 50 and the foot switch 90 can control the driving of the vibration motor 50 so that the foot switch 90 The interval between the On / Off signals of the vibration motor inputted through the vibration motor 50 can be automatically measured. In the display unit 80, the vibration motor 50 is counted from the drive start point to the drive end point in units of seconds It can be displayed.

When measuring the consistency of unconfined concrete through conventional KS F 2427 "Test method for untreated concrete kneading test," one person is responsible for turning on / off the vibration motor, It was inevitable to measure the time taken for the mortar to come into contact with the whole transparent plate by the interaction between the two by taking charge of observing whether or not the entire transparent plate became wet by the mortar rising in the container. In addition, it is often difficult to clearly distinguish between a state in which the transparent disc is in contact with the concrete and a state in which it is wetted by the mortar that is separated by the vibration, and therefore, the observer's subjectivity is often intervened in the above-mentioned time measurement process.

However, according to the present invention, one can operate the kick foot switch 90 while observing whether the mortar floating in the unhardened concrete in the container 40 escapes into the through hole 71 of the transparent disc 70, Data can be efficiently obtained.

The display unit 80 and the foot switch 90 may include a storage battery that provides power for driving the vibration motor 50. In this case, And transmits an On / Off signal of the vibration motor, which is input to the foot switch 90, to the vibration motor via the display 80 .

In addition, the elastic strut 30 is provided with a load cell (not shown) for sensing the weight of the upper part, and the display unit 80 is configured to display the weight measured by the load cell, 40), so that the consistency of unhardened concrete having different specific gravity can be compared and observed on the basis of the same weight.

By using the apparatus of the present invention as described above, it is possible to (a) fill the container 40 with a predetermined amount of uncured concrete; (b) placing the transparent disc 70 on a non-hardened concrete filled in the container 40; And (c) driving the vibration motor 50 to measure the time during which the mortar escapes from the uncured concrete over all of the through holes 71 of the transparent disc 70 or a predetermined and predetermined number of through holes 71 ; The method for measuring the continuity of unhardened concrete can be implemented.

In the step (a), unlike the conventional method, the unconcentrated concrete of a predetermined weight is filled into the container 40 without using a mold (slump cone). As can be seen from this step, according to the present invention, since the test is performed based on the weight of the test body, it is not necessary to use a mold (slump cone). Therefore, unlike the conventional method in which unstiffened concrete is made into a specimen of a cone-shaped specimen, there is no possibility that the specimen tilts to one side during the vibration process, which leads to accurate data acquisition.

In the step (b), the transparent disc 70 is placed on the non-hardened concrete filled in the container 40. In this step, the transparent disc 70 is brought into contact with the front surface of the uncured concrete but is clearly distinguished from the state in which the mortar floats up to the through hole 71 due to vibration.

In the step (c), the vibration motor 50 is driven to measure the time when the mortar escapes from the uncured concrete over all of the through holes 71 of the transparent disc 70 or a predetermined and predetermined number of through holes 71 . In this step, the experimenter 1 turns on / off the vibration motor 50 with the foot switch 90 and automatically measures the interval of time during which the vibration motor 50 is turned on / off from the display unit 80, It can be implemented by displaying. When the vibration motor 50 is operated, the vibration caused by the vibration motor 50 is transmitted to the upper plate 20. As a result, the mortar is floated on the test body from the test body filled in the container 40, The mortar is pulled out through the through hole.

In addition, the apparatus of the present invention comprises: a support 100 coupled to a side of the lower plate 10 as shown in FIG. 3; An arm (110) coupled at one end to the support (100) and configured to pivot horizontally about the support; And a pressing rod 120 coupled to the other end of the arm 110 in a vertical direction to move up and down linearly and having a lower end coupled to the center of the transparent disc 70; As shown in FIG.

It is possible to fill the container 40 with the unhardened concrete while horizontally rotating the arm 110 so as not to interfere with the dewatering operation and to lower the pressure bar 120 after the uncompacted concrete is dewatered The transparent disc 70 can be brought into contact with the upper surface of the hardened concrete in the container 40.

In the case where the support 100, the arm 110, and the pressure bar 120 are provided in the apparatus of the present invention as described above, a method of measuring the consistency of unhardened concrete comprises the steps of: (a) 40); (b ') lowering the pressure bar (120) and bringing the transparent disc (70) into contact with uncured concrete in the container (40); And (c) driving the vibration motor 50 to measure the time during which the mortar escapes from the uncured concrete over all of the through holes 71 of the transparent disc 70 or a predetermined and predetermined number of through holes 71 ; .

The steps (a) and (c) are as described above. However, unlike the case where the transparent disc 70 is placed on the non-solidified concrete in the step (b), in the step (b '), the transparent disc 70, Lt; RTI ID = 0.0 > non-hardened < / RTI > In the step (b), the lower surface of the transparent disc 70 is lowered by controlling the lowering height of the transparent disc 70, The load of the transparent disc 70 is not applied to the unhardened concrete. The pressing rod 120 also serves to balance the transparent disc 70 so that the transparent disc 70 is not tilted to one side when vibration is applied to the container 40.

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, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It is therefore intended that the appended claims cover such modifications and variations as fall within the true scope of the invention.

10: bottom plate 20: top plate 30:
40: Vessel 50: Vibration motor 60: Rubber base
70: transparent plate 80: display part 90: foot switch

Claims (7)

A bottom plate 10;
An upper plate 20;
An elastic strut (30) installed between the upper and lower plates (20, 30) such that the upper plate (20) is spaced apart in parallel with the lower plate (10);
A cylindrical container 40 coupled to an upper surface of the top plate 30 such that an opening thereof is directed upward;
A vibration motor (50) coupled to a lower surface of the top plate (20) to cause vibration of the top plate (20);
A rubber pedestal 60 coupled to a lower surface of the lower plate 10;
A transparent disc 70 having an outer diameter of a size corresponding to the inner diameter of the container 40 and placed on the unreinforced concrete in the container 40 in which a plurality of through holes 71 are regularly formed on the surface of the container 40;
A display unit 80 for displaying the driving time of the vibration motor 50; And
A foot switch (90) for controlling driving of the vibration motor (50); And a non-rigid concrete lightweight measuring device.
The method of claim 1,
The elastic strut 30 is provided with a load cell (not shown) for sensing the weight of the upper portion,
Wherein the display unit (80) is configured to display the weight measured by the load cell.
The method of claim 1,
Wherein the display unit (80) has a built-in accumulator for providing power for driving the vibration motor (50).
4. The method of claim 3,
The display unit 80 and the foot switch 90 transmit and receive signals through the short-range wireless communication means,
And an on / off signal of the vibration motor input to the foot switch 90 is transmitted to the vibration motor via the display 80. The apparatus for measuring the lightness of the concrete of a non-hardened concrete.
5. The method according to any one of claims 1 to 4,
A support 100 coupled to a side of the lower plate 10;
An arm (110) coupled at one end to the support (100) and configured to pivot horizontally about the support; And
A pressing rod 120 coupled to the other end of the arm 110 in a vertical direction to move up and down linearly and having a lower end coupled to the center of the transparent disc 70; Further comprising: a light-weight measuring device for measuring the lightness of the concrete.
A method for measuring the consistency of unhardened concrete using the apparatus of any one of claims 1 to 4,
(a) filling the container 40 with a predetermined amount of uncured concrete;
(b) placing the transparent disc 70 on a non-hardened concrete filled in the container 40; And
(c) driving the vibration motor (50) to measure the time during which the mortar escapes from the uncured concrete over all of the through holes (71) of the transparent disc (70) or a predetermined and predetermined number of through holes (71); Of the concrete.
A method of measuring the consistency of unfragrant concrete using the apparatus of claim 5,
(a) filling the container 40 with a predetermined amount of uncured concrete;
(b ') lowering the pressure bar (120) and bringing the transparent disc (70) into contact with uncured concrete in the container (40);
(c) driving the vibration motor (50) to measure the time during which the mortar escapes from the uncured concrete over all of the through holes (71) of the transparent disc (70) or a predetermined and predetermined number of through holes (71); Of the concrete.

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