JP2010276413A - Sheet for slump test, slump test device, and slump test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet for a slump test which accurately measures a slump. <P>SOLUTION: The sheet for the slump test is provided, disposed on the upper surface of fresh concrete within a slump cone, formed so as to have a size fitted into the upper end opening of the slump cone, and includes a sheet mark indicating a central section on the upper surface when the sheet is disposed on the upper surface of the fresh concrete within the slump cone. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a slump test sheet, a slump test instrument provided with the slump test sheet, and a slump test method for measuring a slump of fresh concrete using the slump test instrument.

  Conventionally, in order to evaluate the workability of fresh concrete, a test specified in JIS A 1101 “Concrete slump test method” has been performed.

Such a test is a test for examining the fluidity of fresh concrete using a test container called a slump cone. As shown in FIGS. 4 and 5, the slump cone 101 used in such a test has a truncated cone shape and a hollow shape, has openings at the upper end and the lower end, and has an inner diameter of 100 mm and an inner diameter of the lower end. It is formed so as to be 200 mm in height and 300 mm in height.
Specifically, in such a test, as shown in FIG. 6, the slump cone 101 is placed on the slump plate 102, and fresh concrete 103 is packed from the upper end opening 101 a of the slump cone 101. The step of aligning the upper surface of the fresh concrete 103 packed in the upper end opening 101a (FIG. 6A), the slump cone 101 packed with the fresh concrete 103 is pulled out vertically, The step of measuring the falling width (slump) at the center of the upper surface (FIG. 6B) is performed.
Further, in such a test, the central portion of the upper surface of the fresh concrete 103 is set to a reference range (for example, 5 cm from the central axis with respect to the central axis on which the slump cone 101 is installed when the fresh concrete 103 is packed into the slump cone 101. In general, retesting is performed if the above is not satisfied.

However, in such a conventional test method, when the collapse of the fresh concrete 103 when the slump cone 101 is pulled out is distorted, it is difficult to determine the position of the central portion of the upper surface of the fresh concrete 103 after being pulled out. There is a problem that it is difficult to accurately measure the current.
In addition, since it is difficult to determine the position of the central portion of the upper surface of the fresh concrete 103 after drawing, it is difficult to grasp the distance between the central portion of the upper surface of the fresh concrete 103 and the central axis. There is a possibility that a slump measured in a state where the central portion is out of a reference range (for example, within 5 cm from the central axis) may be adopted, and it is difficult to accurately measure the slump from this point.

  In view of the above problems, an object of the present invention is to provide a slump test sheet, a slump test instrument, and a slump test method capable of measuring slump with higher accuracy.

  The present invention is formed so as to fit in the upper end opening of the slump cone so as to be disposed on the top surface of the fresh concrete in the slump cone, and when the top surface is disposed on the top surface of the fresh concrete in the slump cone. The slump test sheet is characterized in that a sheet mark indicating the central portion of the sheet is provided.

  According to such a slump test sheet, even after the slump cone is pulled out by arranging the slump test sheet on the upper surface of fresh concrete fitted to the upper end opening of the slump cone and pulling out the slump cone vertically. Since the slump test sheet can remain on the upper surface, a sheet mark remains on the upper portion of the central portion of the upper surface, and the position of the central portion can be determined with higher accuracy. Therefore, according to such a slump test sheet, the slump can be measured with higher accuracy.

  In the slump test sheet according to the present invention, preferably, an opening is provided as the sheet mark.

According to such a slump test sheet, when the slump test sheet is arranged on the upper surface of the fresh concrete fitted to the upper end opening of the slump cone and the slump cone is pulled out vertically with the slump test sheet still in place. Can directly contact a measuring instrument or the like for measuring the slump from the opening as the sheet mark to the center of the upper surface of the fresh concrete, so that it is possible to measure the slump more accurately. is there.
Further, according to such a slump test sheet, after arranging the slump test sheet on the upper surface of the fresh concrete fitted to the upper end opening of the slump cone, a colorant is applied to the fresh concrete from the opening as the sheet mark. When applied, the colorant can directly mark the center of the upper surface of the fresh concrete, so that a measuring instrument or the like for measuring slump can be brought into direct contact with the center of the upper surface of the fresh concrete. Therefore, there is an advantage that the slump can be measured with higher accuracy. Unlike the case where the slump cone is pulled out vertically with the slump test sheet placed on the top surface of the fresh concrete without directly marking the center of the top surface of the fresh concrete, the slump cone is pulled out vertically. In addition, there is an advantage that the slump can be measured with higher accuracy since the sheet mark is not shifted from the position of the center portion of the upper surface of the fresh concrete and the position of the center portion cannot be discriminated.

  Further, in the slump test sheet according to the present invention, preferably, the sheet mark 11 is provided with a central portion formed so that a colorant can be applied.

  According to such a slump test sheet, a colorant is applied to the sheet mark, and the surface of the fresh concrete that is fitted to the upper end opening of the slump cone is applied so that a portion where the colorant is applied contacts the fresh concrete. By arranging the slump test sheet, it is possible to directly mark the center of the upper surface of the fresh concrete, so that a measuring instrument for measuring the slump is brought into direct contact with the position of the center of the upper surface of the fresh concrete. Therefore, there is an advantage that the slump can be measured with higher accuracy. Unlike the case where the slump cone is pulled out vertically with the slump test sheet placed on the top surface of the fresh concrete without directly marking the center of the top surface of the fresh concrete, the slump cone is pulled out vertically. In addition, since the sheet mark is not shifted from the position of the center portion of the upper surface of the fresh concrete and the position of the center portion cannot be determined, there is an advantage that the slump can be measured with higher accuracy.

  The present invention also provides a slump test instrument comprising the slump test sheet, a slump cone, and a slump plate on which the slump cone is placed when fresh concrete is packed into the slump cone.

  Further, in the slump test instrument according to the present invention, preferably, the slump plate displays two intersecting straight lines, and the intersection of the two intersecting straight lines indicates the center point of the installation position of the slump cone. obtain.

According to such a slump test instrument, it becomes even easier to grasp the positional relationship between the central portion of the top surface of the fresh concrete after the slump cone is pulled out and the central axis of the slump cone before the slump cone is pulled out. Since it is easier to grasp the distance between the center and the center axis, a slump measured in a state where the center of the upper surface of the fresh concrete is out of the reference range (for example, within 5 cm from the center axis) is used. Therefore, there is an advantage that slump can be measured with higher accuracy.
In addition, according to such a slump test instrument, unnecessary retesting is suppressed, and there is an advantage that workability can be improved.

  In the slump test instrument in which the intersecting straight lines are displayed on the slump plate, preferably, parallel straight lines arranged on the slump plate so as to be parallel to the intersecting straight lines and on both sides of the intersecting straight lines. Is displayed.

According to such a slump test instrument, if the predetermined interval is the same as the width of the reference range, it is much easier to grasp whether the distance between the central portion and the central axis is within the reference range. Therefore, there is an advantage that it is possible to suppress the possibility of adopting the slump measured in a state where the center portion of the upper surface of the fresh concrete is out of the reference range, and it is possible to measure the slump with higher accuracy.
Moreover, according to such a slump test instrument, there is an advantage that unnecessary retesting is further suppressed and workability can be further improved.

  Further, in the slump test instrument in which the intersecting straight lines are displayed on the slump plate, preferably, the slump plate has a circle having the same size as the outer periphery of the lower end of the slump cone and centered on the intersection. It is displayed.

According to such a slump test instrument, the slump cone can be more accurately installed on the slump plate so that the intersection is the center point of the installation position of the slump cone. Distance can be more accurately grasped, and the possibility of adopting the slump measured in a state where the central portion is out of the reference range can be further suppressed, and the slump can be measured with higher accuracy. There is an advantage.
Moreover, according to such a slump test instrument, there is an advantage that unnecessary retesting is further suppressed and workability can be further improved.

  Furthermore, the present invention is a slump test method for measuring the slump of fresh concrete by arranging the slump test sheet on the upper surface of the fresh concrete fitted to the upper end opening of the slump cone, and pulling out the slump cone vertically.

  As described above, according to the present invention, it is possible to provide a slump test sheet, a slump test instrument, and a slump test method that can measure slump with higher accuracy.

The front view of the sheet | seat for slump tests concerning one Embodiment. (A) The front view of the slump board of the slump test instrument of one Embodiment, (b) The front view of the slump board after the slump cone was pulled out. Schematic of the slump test method of this embodiment. (A) Side view of slump cone, (b) Plan view of slump cone. The perspective view of a slump cone. Schematic of the conventional slump test method.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the slump test sheet 1 of the present embodiment is formed in a size that fits within the upper end opening of the slump cone so as to be disposed on the upper surface of the fresh concrete in the slump cone. The sheet mark 11 which shows the center part of this upper surface is provided when it distribute | arranges to the upper surface of an inside fresh concrete.

  Specifically, the slump test sheet 1 of the present embodiment is provided with an opening as the sheet mark 11. The slump test sheet 1 of the present embodiment is formed such that the opening serving as the sheet mark 11 is formed in a circular shape, and the diameter of the opening is, for example, 5 to 35 mm, preferably 10 to 30 mm. .

  Further, the slump test sheet 1 of the present embodiment has a circular outer periphery. The diameter of the slump test sheet 1 of the present embodiment is formed to be the same size or smaller than the upper end opening (diameter: 100 mm) of the slump cone, for example, 85 to 99 mm, preferably 90 to 95 mm. It is formed to become.

  Further, the slump test sheet 1 of the present embodiment is formed so that the thickness is preferably 0.05 to 0.3 mm, more preferably 0.1 to 0.2 mm.

  Furthermore, the material of the slump test sheet 1 of the present embodiment is not particularly limited as long as the effects of the present invention are not impaired. For example, polyamide (for example, nylon), polyester (for example, And synthetic fibers such as polyethylene terephthalate) and vegetable fibers (pulp and the like). Among these, pulp is preferable. The slump test sheet 1 of the present embodiment has a relatively small rigidity because the material is pulp, so that the adhesion to the concrete is increased, and when the slump cone is pulled out vertically, There is an advantage that the possibility that the sheet mark 11 is displaced from the central portion is suppressed, and the slump can be measured with higher accuracy. Further, since the pulp is relatively light, the risk of affecting the measurement of the slump due to the weight of the slump test sheet 1 itself is suppressed.

  The slump test sheet 1 of the present embodiment is configured as described above. Next, the slump test instrument of the present embodiment will be described.

  The slump test instrument of the present embodiment includes the slump test sheet 1 of the present embodiment, a slump cone, and a slump plate on which the slump cone is installed when filling the slump cone with concrete.

  As shown in FIG. 2, the slump plate 2 displays two intersecting straight lines 21, more specifically two straight lines 21 orthogonal to each other. In detail, the two straight lines 21 are arranged such that the intersection is located at or near the center of the slump plate 2 so that the intersection can indicate the center point of the slump cone installation position. .

  The slump plate 2 displays parallel straight lines 22 that are parallel to the intersecting straight lines 21 and are arranged on both sides of the intersecting straight lines 21 so as to have a predetermined interval.

  Further, the slump plate 2 displays a circle 23 having the same size as the outer periphery of the lower end of the slump cone and centering on the intersection.

  Examples of the slump cone include those defined in JIS A 1101 “Concrete slump test method”.

  The slump test instrument of this embodiment is configured as described above. Next, the slump test method of this embodiment will be described.

  In the slump test method of this embodiment, the slump test sheet 1 of this embodiment is placed on the top surface of fresh concrete fitted to the upper end opening of the slump cone, and the slump cone is pulled out vertically to measure the slump of fresh concrete. To do.

  Specifically, as shown in FIG. 3, the slump cone 4 is placed on the slump plate 2 so that the central axis of the slump cone 4 is located on the intersection of the two straight lines 21. A step of filling the fresh concrete 3 from the upper end opening of the slump cone 4 and aligning the upper surface of the fresh concrete 3 with the upper end opening, and placing the slump test sheet 1 of the present embodiment on the upper surface of the fresh concrete 3. The sheet placing step and the slump measuring step of measuring the slump of the fresh concrete 3 by pulling out the slump cone 4 vertically while placing the slump test sheet 1 of the present embodiment is carried out.

  The slump test sheet, slump test instrument, and slump test method of the present embodiment are configured as described above, and thus have the following advantages.

That is, in the slump test instrument of the present embodiment, the center of the installation position of the slump cone becomes even easier because the two intersecting lines 21 are orthogonal to each other. As a result, it becomes easier to grasp the positional relationship between the central portion of the top surface of the fresh concrete after the slump cone is pulled out and the central axis of the slump cone before the slump cone is pulled out. Since it is much easier to grasp the distance between the two, the possibility of adopting a slump measured when the central part of the upper surface of the fresh concrete is out of the reference range (for example, within 5 cm from the central axis) is suppressed. There is an advantage that the slump can be measured with higher accuracy.
Moreover, according to such a slump test instrument, there is an advantage that unnecessary retesting is further suppressed and workability can be further improved.

  Note that the slump test sheet, slump test instrument, and slump test method of the present embodiment have the above-described configuration, but the slump test sheet, slump test instrument, and slump test method of the present invention are described above. The design is not limited to the configuration and can be changed as appropriate.

  That is, in the slump test method of the present embodiment, in the slump measurement process, the slump cone 4 is pulled out vertically while the slump test sheet 1 of the present embodiment is placed, and the slump of the fresh concrete 3 is measured. However, after applying the colorant to the fresh concrete 3 from the opening as the sheet mark 11 and removing the slump test sheet 1 of the present embodiment from the upper surface, the slump cone 4 is pulled out vertically and the fresh concrete 3 is removed. You may measure the slump.

  Such a slump test method is different from the case where the slump cone 4 is pulled out while the slump test sheet 1 is arranged on the upper surface of the fresh concrete 3 without directly marking the central portion of the upper surface of the fresh concrete 3. When the cone 4 is pulled out vertically, the sheet mark 11 is prevented from being displaced from the position of the center portion of the upper surface of the fresh concrete 3 and the position of the center portion cannot be discriminated. There is an advantage that it can be measured.

  As said colorant, what contains the pigment which can color the fresh concrete 3 can be used, As said pigment, a white pigment (for example, titanium dioxide, lead white, zinc white etc.), a red pigment ( For example, red lead, iron oxide red, etc.), blue pigments (eg, urotramarine blue, prussian blue, etc.), black pigments (eg, carbon black, etc.), and the like.

  Further, the slump test sheet 1 of the present embodiment is provided with an opening as the sheet mark 11, but in the present invention, the sheet mark 11 is formed so that a colorant can be applied. The center part may be provided.

In the case of using such a slump test sheet 1, a colorant is applied to the sheet mark 11, and the applied portion is placed on the upper surface of the fresh concrete 3 in the slump cone 4 so that the applied portion contacts the fresh concrete 3. The slump cone 4 may be pulled out after placing a mark on the central portion of the upper surface of the fresh concrete 3 by arranging the slump test sheet 1. In this case, the slump test sheet may be peeled off after the slump cone 4 is pulled out, or may be peeled off before the slump cone 4 is pulled out.
Such a slump test method is different from the case where the slump cone 4 is pulled out vertically while the slump test sheet 1 is placed on the top surface of the fresh concrete 3 without directly marking the center of the top surface of the fresh concrete 3. When the slump cone 4 is pulled out vertically, it is prevented that the sheet mark 11 is displaced from the position of the center portion of the upper surface of the fresh concrete 3 and the position of the center portion cannot be discriminated. There is an advantage that it can be measured.

  1: slump test sheet, 2: slump plate, 3: fresh concrete, 4: slump cone, 11: sheet mark, 21: intersecting straight line, 22: parallel straight line, 23: circle, 101: slump cone, 101a: upper end opening Part, 102: slump plate, 103: fresh concrete

Claims (8)

  It is formed in a size that fits within the top opening of the slump cone so as to be placed on the top surface of the fresh concrete in the slump cone, and when placed on the top surface of the fresh concrete in the slump cone, A sheet for a slump test, characterized in that a sheet mark is provided.   The slump test sheet according to claim 1, wherein an opening is provided as the sheet mark.   The slump test sheet according to claim 1, further comprising a central portion formed so that a colorant can be applied as the sheet mark.   A slump test instrument comprising the slump test sheet according to any one of claims 1 to 3, a slump cone, and a slump plate on which the slump cone is placed when fresh concrete is packed into the slump cone.   The slump test instrument according to claim 4, wherein two intersecting straight lines are displayed on the slump plate, and an intersection of the two intersecting straight lines can indicate a center point of a slump cone installation position.   6. The slump test instrument according to claim 5, wherein the slump plate displays parallel straight lines arranged in parallel to the intersecting straight lines and having a predetermined interval on both sides of the intersecting straight lines.   The slump test instrument according to claim 5 or 6, wherein the slump plate displays a circle having the same size as the outer periphery of the lower end of the slump cone and centered on the intersection.   A slump test in which the slump test sheet according to any one of claims 1 to 3 is arranged on an upper surface of fresh concrete fitted to an upper end opening of the slump cone, and the slump cone is pulled out vertically to measure a slump of the fresh concrete. Method.

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