JP3248760U - Consistency evaluation tester for polymer cement mortar - Google Patents

Abstract

[Problem] To provide a polymer cement mortar consistency evaluation tester that is portable and can easily evaluate polymer cement mortar on-site. [Solution] The polymer cement mortar consistency evaluation tester has a flat base plate, a pair of clamping plates that are placed on the base plate and clamp a test specimen made of polymer cement mortar, a weight to be placed on the clamping plates, and a flow cone that shapes the test specimen into a predetermined shape, and two rod-shaped handles are horizontally and erected on the side of the weight symmetrically with respect to the center in a plan view, and two guide rods are erected on the upper surface near the ends of the base plate, and the guide rods are slidably fitted into fitting grooves provided in the handles, allowing the weight to move up and down between the two guide rods while maintaining a substantially horizontal position. [Selected Figure] Figure 1

Description

This invention relates to a consistency evaluation tester for evaluating polymer cement mortar, and in particular to a consistency evaluation tester that is portable and can easily perform evaluation tests on-site.

Polymer cement mortar (hereinafter referred to as "PCM"), which is made by mixing a polymer emulsion with cement mortar, is used for cross-section repair work or cross-section thickening work of concrete structures.
Quality control testing of PCM is stipulated to be evaluated in accordance with JIS A 1171:2016 "Test methods for polymer cement mortar."
Of these, the method for evaluating the consistency of PCM is described, which is based on a flow test (15 stroke flow test, conforming to JIS R 5201:2015) and a slump test (mini slump test, conforming to JIS A 1171:2016).

Conventional methods for evaluating the consistency of PCM have the following problems.
(1) The test device for the 15-stroke flow test requires the flow table to be fixed integrally to the concrete base, and therefore cannot be easily performed on site.
(2) The mini-slump test equipment is lightweight and small, making it a superior on-site evaluation method to the 15-stroke flow test. However, with PCMs with mini-slump values below 30 mm, cavity-like voids form in the slump cone, and with PCMs with mini-slump values above 80 mm, the slump cone collapses under its own weight and the shape of the slump cone cannot be maintained, making it impossible to perform an accurate test in either case.

The purpose of this invention is to provide a PCM consistency evaluation tester that is portable and can easily evaluate PCM in the field.

The PCM consistency evaluation tester of the present invention, which solves the above problems, comprises a flat base plate, a pair of clamping plates that are placed on the base plate and clamp a test body made of PCM, a weight that is placed on the clamping plates, and a flow cone that shapes the test body into a predetermined shape, and two rod-shaped handles are arranged horizontally on the sides of the weight, symmetrically about the center when viewed in a plane, and two guide rods are arranged vertically on the upper surface near the end of the base plate, and the guide rods are slidably fitted into fitting grooves provided in the handles, allowing the weight to move up and down between the two guide rods while remaining approximately horizontal.
Of the pair of pressure plates, at least the upper pressure plate disposed above the test piece may be transparent.
The guide rod may be detachably attached to the base plate.

With the above configuration, the present invention has at least one of the following effects.
<1> There is no need for a concrete stand like the test device for the 15-stroke flow test, and the test can be easily performed on site.
<2> The base plate, pressure plate, weight, and flow cone are all easy to transport and handle on-site, allowing anyone to easily perform a consistency evaluation test on-site.
<3> By fitting the guide rod 11 into the fitting groove provided in the handle, the weight will lower under its own weight while remaining approximately horizontal, so that the test specimen S can be deformed uniformly.
<4> By providing the guide rod in an upright position so as to be detachable from the base plate, the guide rod can be removed and easily carried together with the base plate.

FIG. 1 is a perspective view of a PCM consistency evaluation tester according to the present invention. FIG. 2 is a perspective view of a PCM consistency evaluation tester according to the present invention. Layout of base plate and clamping plate Base plate and weight layout Cross-section of the flow cone and test specimen Diagram of the consistency evaluation tester in use (1) Diagram of consistency evaluation tester in use (2) Diagram of consistency evaluation tester in use (3) Diagram of consistency evaluation tester in use (4) Diagram of consistency evaluation tester in use (5) Diagram of consistency evaluation tester in use (6)

The following describes in detail the PCM consistency evaluation tester of the present invention with reference to the drawings.

<1> Configuration of consistency evaluation tester (Fig. 1, Fig. 2)
The PCM consistency evaluation tester of the present invention is intended to perform on-site consistency tests, which are a type of quality test for PCM.
The PCM consistency evaluation tester of the present invention comprises a flat base plate 1,
It comprises a pair of clamping plates 2 for clamping a PCM specimen S to be tested, a weight 3, and a flow cone 4 for weighing and shaping the specimen S (Figs. 1 and 2).

<2> Base Plate The base plate 1 is a flat plate made of metal, resin, or the like.
Two guide rods 11 are erected on the upper surface of the base plate 1 near its end portions, symmetrically with respect to the center of the base plate 1 .
The base plate 1 is a plate body, and the guide rod 11 is detachably attached to the base plate 1, so that the guide rod 11 can be removed and easily carried together with the base plate 1.

<3> Clamping Plate The clamping plate 2 is a pair of square plates that are placed on the base plate 1 and clamp the test specimen S.
The pressing plate 2 is formed by combining a lower plate 21 and an upper plate 22, which are transparent flat plates made of glass, resin, etc. In particular, the upper plate 22, which presses the test specimen S from above, is preferably a transparent flat plate, and by making the lower plate 21 a transparent flat plate as well, the two flat plates can be used as either the lower plate 21 or the upper plate 22 without distinction.
The pressing plate 2 is placed on the base plate 1, and by matching the width with the interval between the guide rods 11 erected on the base plate 1, the guide rods 11 serve as positioning members for the pressing plate 2 (FIG. 3). In addition, the base plate 1 may be provided with stoppers 12 at positions perpendicular to and equidistant from the two guide rods 11 and the center of the base plate 1. By providing the stoppers 12, each side of the square lower plate 21 can also be positioned by the guide rods 11 and the stoppers 12.

<4> Weight The weight 3 is a member having a predetermined weight and made of metal or resin.
The weight 3 is provided with a handle 31 for easy handling on site.
The handles 31 are rod-shaped, and two of them are provided horizontally and symmetrically with respect to the center in a plan view on the side surfaces of the weight 3 .

<4.1> Fitting of the guide rod and the handle The length of the handle 31 is set so that when the weight 3 is placed in the center of the upper plate 22 arranged on the base plate 1, the tip of the handle 31 is close to the guide rod 11. Two guide plates 32 are then extended from the sides of the tip of the handle 31 to form a fitting groove 33 between the guide plates 32, and the guide rod 11 is placed in the fitting groove 33 to fit the guide rod 11 and the handle 31 (FIG. 4).
By fitting the guide rods 11 into the fitting grooves 33 provided in the handle 31, the handle 31 and the guide rods 11 can slide freely relative to each other, and the weight 3 can move up and down between the two guide rods 11. In addition, since the tip of the handle 31 is close to the guide rods 11, when the weight 3 is tilted beyond a certain level, the tip of the handle 31 comes into contact with the guide rods 11, allowing the weight 3 to move up and down while remaining approximately horizontal.

<5> Flow Cone The flow cone 4 is a substantially cylindrical member used in the conventional 15-stroke flow test.
The inside of the flow cone 4 has a truncated cone-shaped space with an inclined peripheral surface 41 (Figure 5), and the space is filled with PCM in the same manner as in the conventional 15-stroke flow test to create a test specimen S.

<6> Consistency evaluation test <6.1> Placement of base plate and lower plate Attach the guide rod 11 to the base plate 1 and place it on a flat floor at the site. All that is needed is a flat place to fit the base plate 1, and there is no need for a concrete stand like the tester for the 15 stroke flow test, so this can be easily performed on site.
Thereafter, the lower plate 21 is placed on the base plate 1 (FIG. 6). The lower plate 21 can be easily positioned in the center of the base plate 1 by the guide rod 11 and the stopper 12 provided upright on the base plate 1.

<6.2> Preparation of Test Specimen S The flow cone 4 is placed at the center of the lower plate 21 placed on the base plate 1, and the flow cone 4 is filled with PCM (FIG. 7).
Then, the flow cone 4 is lifted up, so that the test specimen S is placed in the center of the lower plate 21 (FIG. 8).

<6.3> Deformation due to the upper plate and weight The upper plate 22 is placed at the center of the test piece S (Fig. 9). The guide rod 11 is provided on the base plate 1, and the upper plate 22 is transparent, so it can be easily placed at the center of the test piece S.
Then, the guide rods 11 are fitted into the fitting grooves 33 at the tips of the handles 31 of the weights 3, and the weights 3 are positioned directly above the test piece S and placed as is on the upper plate 22 (FIG. 1).
The weight of the upper plate 22 and the weight 3 causes the test specimen S to deform (FIG. 10). The weight 3 lowers under its own weight while maintaining a substantially horizontal position, so that the test specimen S can be deformed uniformly.

<6.4> Measurement The maximum flow length _L1 of the deformed specimen S and the flow length L2 in the direction perpendicular to the maximum flow length _L1 are measured (FIG. 11), and the average length ( _L1 + _L2 )/2 is calculated.
Since the upper plate 22 is transparent, measurements can be easily made through the upper plate 22 .
Then, the consistency of the PCM constituting the test specimen S is evaluated based on the average length (L ₁ +L ₂ )/2.
The base plate 1, the pressure plate 2, the weight 3, and the flow cone 4 are all easy to transport and handle on-site, allowing anyone to easily perform a consistency evaluation test on-site.

REFERENCE SIGNS LIST 1 base plate, 11 guide rod, 12 stopper 2 clamping plate, 21 lower plate, 22 upper plate 3 weight, 31 handle, 32 guide plate, 33 fitting groove 4 flow cone, 41 inclined surface S test specimen

Claims (3)

A flat base plate;
a pair of pressing plates disposed on the base plate for pressing a test specimen made of polymer cement mortar;
A weight placed on the pressing plate;
A flow cone for forming the test specimen into a predetermined shape;
Two rod-shaped handles are provided horizontally on the side of the weight, symmetrically with respect to the center in a plan view,
Two guide rods are provided upright on an upper surface of the base plate near the end thereof,
The guide rods are slidably fitted into fitting grooves provided in the handle, so that the weight can move up and down between the two guide rods while remaining substantially horizontal.
A tester for evaluating the consistency of polymer cement mortar. Of the pair of clamping plates, at least the upper clamping plate arranged on the upper side of the test body is transparent.
A consistency evaluation tester for polymer cement mortar according to claim 1. The guide rod is detachably mounted on the base plate.
A consistency evaluation tester for polymer cement mortar according to claim 1 or 2.

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