JP2745479B2 - Quality test equipment for high fluidity concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quality test apparatus for measuring the separation resistance of highly fluid concrete.

[0002]

2. Description of the Related Art As one of the high-performance techniques for concrete, the workability of concrete is improved, thereby improving the durability of concrete by reducing poor construction work and restoring the reliability of concrete structures. Research that is active. The technical solution to make this possible is to increase the slump and slump flow by making the concrete highly fluid using a high-performance AE water reducing agent or the like. However, if the concrete is made highly fluid, the separation resistance is remarkably reduced. Therefore, it is necessary to understand the separation properties of the concrete. The following three states can be considered as concrete separation phenomena.
In the case of high-fluidity concrete, the evaluation of the separation of coarse aggregate and mortar is considered to be a key point. Water, paste and fine aggregate coarse aggregate and mortar

As an apparatus for measuring the fluidity of such highly fluid concrete, the present applicant has proposed a concrete quality test apparatus according to Japanese Patent Application Laid-Open No. 1-297529. The test apparatus (hereinafter, referred to as an L-type flow test apparatus) includes an L-shaped casing, and the casing includes a vertical section acting as a storage section and a horizontal section acting as a flow section. An upper end of the vertical portion is open, and an opening is formed in a portion corresponding to a lower side surface of the vertical portion to communicate with the horizontal portion. The vertical portion houses a partition plate movable along the side surface of the vertical portion, and the opening can be opened and closed by the partition plate.

After the concrete is stored in the storage portion of the housing, the opening formed in the lower portion of the storage portion is opened to allow the concrete to flow under its own weight in the flowing portion of the housing to deform the concrete. The yield value is measured by detecting the moving amount of the concrete in the flowing portion by the moving amount detecting means. In addition, the viscosity is measured by measuring the elapsed time from the time when the opening / closing means opens the opening by the measuring means and calculating the flow speed of the concrete from the movement amount detected by the movement amount detecting means and the elapsed time. hand,
The yield value and viscosity of concrete are measured simultaneously.

[0005]

However, the above L
The measurement of fluidity in places where there is no frictional resistance system such as iron skeletons, such as the method using a die-type flow tester or the existing test method (eg, slump test), requires concrete in densely laid members. It was not possible to accurately grasp the flow characteristics and the separation phenomenon of aggregate.

Accordingly, the present invention has made it possible to grasp and evaluate the segregation of aggregates in a reinforcing bar of high-fluidity concrete, as well as to grasp and evaluate form filling and self-leveling. It is an object of the present invention to provide a quality test device for fluid concrete.

[0007]

In order to achieve the above object, the present invention comprises a horizontally long horizontal test unit, a vertically long storage unit and a vertical test unit, each of which is formed in a box shape by a transparent plate. The unit and the vertical test unit are detachably attached to both ends of the horizontal test unit through openings, and a partition plate that opens and closes the opening between the storage unit and the horizontal test unit is provided. The unit is characterized in that a reinforcing grid is detachably mounted in the unit.

[0008]

After filling the storage unit with a predetermined amount of concrete, the partition plate is pulled up and the concrete flows from the opening to the horizontal test unit. If the stoppage occurs in the middle of the horizontal test unit, the flowability can be quantitatively evaluated by measuring the stop point. In addition, when the aggregate is clogged at the location of the reinforcing bar grid, the separation resistance can be evaluated by measuring the descending amount of the upper end of the concrete in the storage unit. For those that flowed to the vertical test unit after receiving resistance in the horizontal test unit, the level difference of the top of concrete between the storage unit and the vertical test unit was read to measure the self-leveling degree, and the flowability was quantitatively determined. evaluate.

In the case where the reinforcing bar grid is not used in the horizontal test unit, if the hole for mounting the reinforcing bar grid of the transparent plate is used by closing it with rubber or the like, it can be used as a substitute for the conventional L-type flow test apparatus and besides the horizontal type. By laying various form materials on the bottom surface of the test unit, it is possible to make a relative comparison of slipperiness due to a difference in form material. Furthermore, when the reinforcing bar grid is not used, a test for confirming the filling property of the concrete under the opening form such as a wall can be performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the quality test apparatus of this embodiment, as shown in FIG. 1, a vertically long storage unit A and a vertically long storage unit C are detachably attached to both ends of a horizontally long horizontal test unit B, respectively. Each of the units A, B, and C is formed in a rectangular parallelepiped box shape by a transparent plate 1 made of an acrylic resin or the like so that the fluidity of concrete can be easily observed from the outside, and each transparent plate 1 is easily cleaned. For this purpose, they are detachably attached to each other by screws or the like. The units A, B, and C are in communication with each other by openings 2 and 3 provided in a connection portion of each other.

The storage unit A has an open upper surface, a ruler 4 attached to one end of one side surface in a vertical direction, and a partition plate 5 for opening and closing the opening 2 on the side surface of the unit B. It is mounted so that it can move up and down.

In the horizontal test unit B, a reinforcing bar lattice 7 (only a part is shown in FIG. 1) in which reinforcing bars 6 are assembled three-dimensionally by welding or the like is removably incorporated in the transparent plate 1. That is, as shown in FIG. 2, one end of the reinforcing bar 6 is fitted into a hole of the transparent plate 1 on one side, and is fixed to the transparent plate 1 on the other side by a bolt portion 8 and a nut 9 provided at the other end. In addition,
By changing the type of reinforcing bar 6 to be incorporated (shape of the knot on the surface, etc.), the diameter and the interval, or changing the length of the horizontal test unit B, various friction resistance systems assuming actual members are reproduced. can do. Also, at one end of the bottom,
A ruler 10 is attached along the longitudinal direction of the unit B.

The vertical test unit C measures the degree of self-leveling of concrete that can flow up to this pressure, and a ruler 11 is attached to one end of the-side surface in the vertical direction.

Next, in order to perform a quality test of concrete using this test apparatus, a predetermined amount of concrete S is filled into the storage unit A with the opening 2 closed by the partition plate 5, and then the partition plate 5 And the concrete S is caused to flow from the opening 2 to the horizontal test unit B. When the unit B stops in the middle of the unit B, by reading the scale of the ruler 10 at the stop point, the fluidity can be quantitatively evaluated. In addition, when the aggregate is blocked at the location of the reinforcing bar grid 7, the separation resistance can be evaluated by reading the scale of the ruler 4 of the storage unit A. In other words, it can be evaluated that the lowering amount of the upper end of the concrete in the storage unit A has a higher separation resistance, and that the lowering amount of the storage unit A has a low separation resistance.
In addition, these phenomena are caused by the external
Can be confirmed through With respect to the fluid flowing to the vertical test unit C after receiving the resistance in the horizontal test unit B, the level difference between the scale of the ruler 4 of the storage unit A and the scale of the ruler 11 of the unit C is read. The self-leveling degree is measured, and its fluidity is quantitatively evaluated.

If the reinforcing bar grid 7 is not used in the horizontal test unit B, the hole for mounting the reinforcing bar grid of the transparent plate 1 can be covered with rubber or the like and used instead of the conventional L-type flow test apparatus. By laying various formwork members on the bottom surface of the unit B, it is possible to make a relative comparison of slipperiness due to a difference in material of the formwork. Further, when the reinforcing bar grid 7 is not used, a test for confirming the filling property of the concrete under the opening form such as a wall can be performed.

In the vertical test unit C, it is possible to quantitatively evaluate the self-leveling degree after the concrete S which can flow to this section receives a certain resistance in the horizontal test unit B as described above. The unit C is the same as the storage unit A by removing the horizontal test unit B.
Can be directly attached to the concrete, and the degree of self-leveling of the concrete when no resistance is received can be quantitatively evaluated as one potential of the concrete.

The quality test apparatus of the present invention is effective when used in combination with a slump test and an L-shaped flow test in, for example, a laboratory of a research institution, a live conplant test room, a work place receiving test site, and the like.

[0018]

According to the present invention, it is possible to grasp and evaluate the fluidity and separation resistance of a high-fluidity concrete in a reinforcing bar, that is, in a certain resistance system, and to fill a form. It is possible to grasp and evaluate the performance and self-leveling property, which is useful for the development of highly fluid concrete.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating a mounting state of a reinforcing bar.

[Explanation of symbols]

 A Storage unit B Horizontal test unit C Vertical test unit S Concrete 1 Transparent plate 2, 3 Opening 5 Partition plate 6 Reinforcing bar 7 Reinforcing lattice

Continuation of the front page (72) Inventor Akihiko Toda 2-5-1-14 Minamisuna, Koto-ku, Tokyo Inside Takenaka Corporation Technical Research Institute (56) References JP-A-4-27840 (JP, A)

Claims (1)

(57) [Claims] 1. A horizontal test unit, a vertical storage unit and a vertical test unit each formed in a box shape by a transparent plate. The storage unit and the vertical test unit are provided with openings at both ends of the horizontal test unit. And a removable plate that opens and closes the opening between the storage unit and the horizontal test unit, and a rebar grid is detachably mounted inside the horizontal test unit. Quality testing equipment for highly fluid concrete.