JP5089968B2 - Identification method of concrete specimen - Google Patents

Description

  The present invention relates to a method for identifying a concrete specimen, and more specifically, when identifying a concrete specimen, there is no risk of human error, and the identification (concrete traceability) operation is performed simply, accurately, and reliably. The present invention relates to a method for identifying a concrete specimen that can be recognized and can improve the efficiency of recognition work.

Conventionally, when building a concrete building or structure, in order to confirm the quality of the placed concrete, a part of the ready-mixed concrete used for placing is extracted and the concrete is based on a predetermined standard / standard. After preparing a specimen and applying a predetermined curing to the concrete specimen, an inspection such as a strength test of the concrete specimen is performed by a predetermined inspection organization.
When making, curing, and evaluating this concrete specimen, it is necessary to identify the concrete specimen. Therefore, conventionally, methods such as attaching recognition information such as identification numbers and histories of concrete specimens to the formwork to be placed using a tag or the like, or writing to the formwork with paint or writing tools, etc. Yes.

This concrete specimen is usually made at a ready-mixed concrete factory or at the construction site where it is delivered. However, if there are many kinds of ready-mixed concrete or there are many production lots, etc. If the number increases, human error is likely to occur when identifying concrete specimens, and accuracy of quality control may be lacking.
In addition, in order to recognize and match the specified concrete with the form of the concrete specimen and the placed concrete specimen, it is necessary to perform operations such as mounting a tag and writing with paint and writing tools. In addition, maintenance such as ledger management for associating concrete, formwork and concrete specimens with each other is necessary, and the work becomes complicated and busy.
Furthermore, for the purpose of passing inspections such as strength tests, the recognition information such as the identification number and history of the concrete specimen to be inspected which may be rejected originally is given to the concrete specimen not subject to inspection, It is considered possible to inspect the concrete specimen not subject to inspection as a concrete specimen subject to inspection.

Thus, in order to solve such problems, a concrete specimen identification method using a wireless tag which is a non-contact communication medium has been proposed (Patent Document 1).
In this method, a radio tag having a size of a pebbles in which data related to predetermined concrete is written is prepared in advance, and when the concrete is formed, the radio tag is accommodated in the concrete. At the time of identification, this concrete is identified by reading the data of the wireless tag accommodated in the concrete with a non-contact wireless tag reader.
This wireless tag is inserted when the ready-mixed concrete is poured halfway into the specimen formwork, and then completely embedded in the ready-mixed concrete when the remaining ready-mixed concrete is poured. Then, the concrete specimen in which the wireless tag is embedded is obtained by curing and demolding the ready-mixed concrete.
JP 2004-197312 A

By the way, in the conventional method for identifying a concrete specimen using a wireless tag, the wireless tag that is a non-contact communication medium is simply thrown into the ready-mixed concrete, so that the position of the wireless tag and the direction of the antenna are fixed. Therefore, there is a problem in that it takes time to search for the position of the wireless tag when reading information using the wireless tag reader. In addition, since the wireless tag is installed inside the concrete specimen, the distance from the outer peripheral surface of the concrete specimen to the wireless tag becomes long, so the sensitivity when reading information is lowered and the reliability is poor. There was a point.
In addition, since the remaining ready-mixed concrete is poured after the wireless tag is inserted, there is a possibility that the wireless tag may be damaged when poking the impact of the aggregate contained in the ready-mixed concrete or the concrete to be poured with a stick. There is a problem that the reliability of the identification method using the wireless tag may be lowered.

  In addition, when a foreign object such as a wireless tag is embedded inside the ready-mixed concrete, the size and shape of this wireless tag is about pebbles, so when a concrete specimen is subjected to a strength test, the Young's modulus between the concrete and the wireless tag and Different strengths are factors that reduce the strength of concrete. Therefore, a concrete specimen having a structure in which a wireless tag is accommodated inside concrete has a problem that, when a strength test is performed, a test result equivalent to that of a concrete specimen not containing a wireless tag may not be obtained. It was.

  The present invention has been made to solve the above-described problems, and there is no risk of human error in identification, and identification can be performed simply, accurately, and reliably. It aims at providing the identification method of the concrete specimen which can aim at efficiency improvement of.

  As a result of intensive studies to solve the above problems, the present inventors have used a non-contact communication medium in the form of a thin plate instead of a conventional non-contact communication medium in the form of pebbles, and put ready-mixed concrete in the formwork. If this thin plate-like non-contact communication medium is embedded from the ready-casting surface when placing, the position of the non-contact communication medium becomes constant, so that the identification work is simple, accurate and reliable. Has been found to contribute to the efficiency of the recognition work, and the present invention has been completed.

That is, one of the methods for identifying a concrete specimen of the present invention is a thin plate-like non-contact communication medium in which an end portion of a substrate is stretched and the stretched end portion is marked in accordance with the embedding depth. A concrete specimen is identified by using a method of placing a ready-mixed concrete in a formwork, and then placing the non-contact communication medium on the cast-in surface of the ready-mixed concrete, with the end of the substrate being placed by the end of the substrate. Then, the ready-mixed concrete is embedded so as to protrude from the installation surface, and then the ready-mixed concrete is hardened and demolded, and the end protruding from the installation surface is cut according to the mark to obtain a concrete specimen. The information recorded on the non-contact communication medium of the specimen is read in a non-contact manner using a non-contact communication medium reader, and the concrete specimen is identified based on the read information. That.
In this method of identifying a concrete specimen, a non-contact communication medium in the form of a thin plate , in which the end of the substrate is stretched and the stretched end is marked according to the embedding depth, is applied to the green concrete. In the installation surface, the end of the substrate is embedded so as to protrude from the placement surface, and then this ready-mixed concrete is hardened and demolded, and the end portion protruding from the placement surface is aligned with the mark. By cutting, the position of the non-contact communication medium in the ready-mixed concrete becomes substantially constant from the placement surface. Thereby, when reading information from this non-contact communication medium, it becomes easy to specify the position of the non-contact communication medium. Further, since the non-contact communication medium is located in the vicinity of the placing surface of the concrete specimen, the sensitivity of the antenna when reading information is increased and the reliability is improved.
In addition, by placing the non-contact communication medium in the ready-mixed concrete after placing the ready-mixed concrete, there is no risk that the non-contact communication medium will be damaged by the impact of the aggregate contained in the ready-mixed concrete. There is no risk of a decrease.

Another method for identifying a concrete specimen according to the present invention is that a wrapping-only portion of the wrapping portion is stretched, and the stretched portion of the wrapping is marked according to the embedding depth. A method of identifying a concrete specimen using a thin plate-like non-contact communication medium, in which ready-mixed concrete is placed in a mold, and then the non-contact communication medium is placed on the surface of the ready-mixed concrete . The wrapping-only part is embedded so that it protrudes from the placement surface, and then this ready-mixed concrete is hardened and demolded, and the wrapping-only part protruding from the placement surface is cut according to the mark. a concrete specimen Te, then reads the information recorded on the contactless communication medium of the concrete specimen using a non-contact communication medium reading device in a non-contact Characterized in that based on the read information and identifies the concrete specimen.
In this method of identifying a concrete specimen, a non-contact communication in the form of a thin plate in which only the wrapping portion of the wrapping portion is stretched and the stretched portion of only the wrapping is marked according to the embedding depth. The medium is embedded in the cast-in surface of the ready-mixed concrete so that the wrapping-only portion protrudes from the set-up surface, and then the ready-mixed concrete is hardened / demolded and further protruded from the set-up surface. By cutting the lapping-only portion in accordance with the mark, the position of the non-contact communication medium in the ready-mixed concrete becomes substantially constant from the placement surface. Thereby, when reading information from this non-contact communication medium, it becomes easy to specify the position of the non-contact communication medium. Further, since the non-contact communication medium is located in the vicinity of the placing surface of the concrete specimen, the sensitivity of the antenna when reading information is increased and the reliability is improved.
In addition, by placing the non-contact communication medium in the ready-mixed concrete after placing the ready-mixed concrete, there is no risk that the non-contact communication medium will be damaged by the impact of the aggregate contained in the ready-mixed concrete. There is no risk of a decrease.

The concrete specimen identifying method of the present invention is characterized in that the distance between the antenna portion of the non-contact communication medium and the surface of the concrete specimen is within 3 cm.
In this way, by setting the distance between the antenna portion of the non-contact communication medium and the surface of the concrete specimen to be within 3 cm, the sensitivity of the antenna when reading information becomes higher, and the reliability is improved.

The concrete specimen identifying method of the present invention is characterized in that the non-contact communication medium has a length of 120 mm or less and a width of 30 mm or less.
Thereby, the non-contact communication medium does not affect the strength test result of the concrete specimen. Moreover, when embedding a non-contact communication medium, the opportunity to contact the aggregate in the ready-mixed concrete is reduced, and the embedding work is simplified.

In the method for identifying a concrete specimen of the present invention, the non-contact communication medium is provided with an integrated circuit and an antenna unit capable of writing / reading information on a substrate made of a flexible organic polymer. It is characterized by that.
As described above, the non-contact communication medium has a structure in which an integrated circuit and an antenna unit capable of writing / reading information are provided on a substrate made of a flexible organic polymer, whereby the ready-mixed concrete is cured. In this case, the shape of the non-contact communication medium follows the deformation of the ready-mixed concrete, and there is no possibility that a crack or a gap is generated between the ready-mixed concrete and the non-contacted communication medium. Thereby, there is no possibility that the strength of the concrete is lowered, and even when a strength test is performed, a test result equivalent to that of a concrete specimen in which the non-contact communication medium is not embedded is obtained.

The concrete specimen identifying method of the present invention is characterized in that the integrated circuit and the antenna portion are covered with a film made of an organic polymer.
Thus, by covering the integrated circuit and the antenna part with a film made of an organic polymer, the integrated circuit and the antenna part are protected by the organic polymer even when the ready-mixed concrete is cured, and this is caused by the hardening of the ready-mixed concrete. There is no risk of damage.

In the concrete specimen identification method of the present invention, the information recorded in the non-contact communication medium is identification information of the ready-mixed concrete.
Thus, by using the information recorded on the non-contact communication medium as the identification information of the ready-mixed concrete, the information is read in a non-contact manner using a non-contact communication medium reader, so that the concrete specimen can be read. The composition, characteristics, history, etc. of the ready-mixed concrete used can be easily known.

The concrete specimen identifying method according to the present invention is such that the non-contact communication medium reading device performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium. It is a contact communication medium reading / writing device.
In this way, the non-contact communication medium reading device is a portable non-contact communication medium reading / writing device that performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium. By doing so, it becomes possible to know the composition, characteristics, history, etc. of the ready-mixed concrete used for the concrete specimen on the spot and in real time.

According to one of the methods for identifying a concrete specimen of the present invention, a non-contact communication medium is embedded in the placing surface of the ready-mixed concrete so that the end portion of the substrate protrudes from the placing surface. Since the concrete is hardened / demolded and the end protruding from the placement surface is cut according to the mark, the position of the non-contact communication medium in the ready-mixed concrete can be made substantially constant from the placement surface. Therefore, when reading information from the non-contact communication medium, the position of the non-contact communication medium can be easily specified. In addition, the non-contact communication medium can be embedded easily without the need for a special jig or the like.
Further, the sensitivity of the antenna when reading information can be increased, information reading and identification can be performed accurately, reliably and stably, and the reliability of information reading and identification can be improved.
In addition, since the non-contact communication medium is embedded in the ready-mixed concrete after placing the ready-mixed concrete, when the non-contact communication medium is poured into the ready-mixed concrete, the impact caused by aggregates, etc. It is possible to prevent breakage and to improve the reliability of identification.

According to another one of the concrete specimen identifying methods of the present invention, the non-contact communication medium is embedded in the placing surface of the ready-mixed concrete so that only the wrapping portion protrudes from the placing surface. Since the ready-mixed concrete is hardened and demolded, and the part of the wrapping that protrudes from the placement surface is cut according to the mark, the position of the non-contact communication medium in this ready-mixed concrete is made substantially constant from the placement surface. Therefore, when reading information from the non-contact communication medium, the position of the non-contact communication medium can be easily specified. In addition, the non-contact communication medium can be embedded easily without the need for a special jig or the like.
Further, the sensitivity of the antenna when reading information can be increased, information reading and identification can be performed accurately, reliably and stably, and the reliability of information reading and identification can be improved.
In addition, since the non-contact communication medium is embedded in the ready-mixed concrete after placing the ready-mixed concrete, when the non-contact communication medium is poured into the ready-mixed concrete, the impact caused by aggregates, etc. It is possible to prevent breakage and to improve the reliability of identification.

The best mode for carrying out the method for identifying a concrete specimen of the present invention will be described.
This embodiment is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified.

  In the method for identifying a concrete specimen of the present invention, ready-mixed concrete is placed in a formwork, and then a non-contact communication medium in the form of a thin plate is embedded in the ready-mixed concrete from the ready-cast surface of the ready-mixed concrete. Then, the ready-mixed concrete is hardened and demolded to obtain a concrete specimen, and then the information recorded on the non-contact communication medium of the concrete specimen is read in a non-contact manner using a non-contact communication medium reader. The concrete specimen is identified based on the information obtained.

Next, the concrete specimen identification method will be described in detail with reference to the drawings.
First, a thin plate IC tag (non-contact communication medium) is prepared.
FIG. 1 is a perspective view showing an IC tag (non-contact communication medium) used in the method for identifying a concrete specimen of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA in FIG. In these drawings, the individual thicknesses, aspect ratios, and the like are changed from actual ones for easy explanation.
The IC tag 1 has a thin plate shape, an IC (integrated circuit) 3 capable of writing / reading information on a substrate 2 made of a flexible organic polymer, and around the IC 3. An oblong and spiral antenna portion 4 is provided so as to surround this, and the substrate 2, the IC 3 and the antenna portion 4 are entirely covered with a film 5 made of an organic polymer such as a laminate film. Has been.
The IC tag 1 may be either an active type or a passive type as long as it is a thin plate. However, the IC tag 1 is a passive type from the viewpoint that it is easy to form a predetermined thin plate, and the IC tag is discarded after a strength test. Is preferred.

The substrate 2 may be any substrate as long as it has a function as a support for supporting the IC 3 and the antenna unit 4, and is preferably an organic polymer film in that it has appropriate flexibility and is easy to handle. As the organic polymer film, for example, a plastic film such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC) is preferably used, and in particular, mechanical strength. A polyethylene terephthalate (PET) film is preferred because of its excellent thermal stability.
The shape of the substrate 2 may be set in accordance with the shapes of the IC 3 and the antenna unit 4, but a rectangle is preferable because it is easy to handle when embedded in the ready-mixed concrete.

  The IC 3 is not limited as long as it can write / read the identification information on the concrete specimen, but the identification information already written cannot be erased or overwritten in order to prevent falsification of the identification information. Preferably, only the additional part of the information is written.

The following items are listed as identification information regarding the concrete specimen.
(1) Date of preparation of concrete specimen, name of factory that produced ready-mixed concrete, production lot number, etc. (2) Quality of ready-mixed concrete (slump, air content, chloride ion content, kneading temperature, etc.)
(3) Raw concrete raw materials (aggregate production area, type, density, etc.)
(4) Composition of ready-mixed concrete (material type, mixing ratio)
(5) Supplier, delivery time, unloading time of ready-mixed concrete (6) Compressive strength (test date, test data, etc.)
(7) Other items determined by specifications, etc.

The antenna unit 4 is formed, for example, by etching a metal thin film or metal foil into an ellipse having a predetermined size and a spiral shape.
The film 5 covers the substrate 2, the IC 3 and the antenna part 4 as a whole, and is protected from the external environment. A film having good adhesion to concrete is preferable because it does not affect the strength test of the specimen. A laminate film is preferred. In particular, a laminate film having a multilayer structure composed of a plurality of layers is preferable in terms of high strength.
As this laminate film, for example, a plastic film such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC) is preferably used, and in particular, mechanical strength and heat. A polyethylene terephthalate (PET) film is preferred because of its excellent stability.

The IC tag 1 preferably has a length of 120 mm or less and a width of 30 mm or less, more preferably a length of 60 mm or less and a width of 25 mm or less. The thickness is preferably 3 mm or less, and more preferably 1 mm or less.
If the size of the IC tag 1 is within the above range, the strength test result of the concrete specimen is not affected. Furthermore, when the IC tag 1 is inserted, the opportunity to contact the aggregate in the ready-mixed concrete is reduced, and the embedding work is simplified.
Here, the size of the IC tag 1 is the size excluding the film 5 when the film 5 is not covered, and when the film 5 is covered, the size of the concrete specimen including the film 5 is used. This is the size of the part embedded inside.

This IC tag 1 needs to be used that does not deteriorate due to moisture and alkali contained in the concrete to be placed, and moisture that enters the concrete from the outside during water curing after demolding. Therefore, it is necessary to perform waterproofing and alkaliproof treatment, and it is preferable that the whole is covered with a film 5 made of an organic polymer such as a laminate film. The IC 3 and the antenna unit 4 may be housed in a plastic bag or a sealed container.
Moreover, as the board | substrate 2, IC3, and the antenna part 4, you may use what has durability with respect to the water | moisture content and alkali which are contained in concrete, the water | moisture content which penetrates into concrete from the outside in the case of underwater curing.

Next, as shown in FIG. 3, the ready-mixed concrete 12 is placed in the molds 11, 11 of the concrete specimen in which the bottomed cylinder is halved along the axis, and then the ready-mixed concrete 12 is placed. The IC tag 1 is embedded in the ready-mixed concrete 12 from the surface 12a.
The IC tag 1 is embedded in the ready-mixed concrete 12 with the antenna portion 4 of the IC tag 1 parallel to the inner surface 11a of one mold 11 or inclined with respect to the inner surface 11a.

Considering the sensitivity and stability at the time of writing / reading of the IC tag 1, it is preferable that the antenna surface of the antenna portion 4 of the IC tag 1 is parallel to the inner surface 11 a of the mold 11.
Further, when the antenna surface of the antenna portion 4 of the IC tag 1 is embedded in an inclined state with respect to the inner surface 11a, the antenna portion of the IC tag 1 is taken into consideration when the sensitivity and stability at the time of writing / reading of the IC tag 1 are taken into consideration. 4 is preferably within 45 ° with respect to the inner surface 11a, and more preferably within 30 °.

The IC tag 1 is preferably located in a region within 3 cm from the inner surface 11a of the mold 11 and more preferably in a region within 1 cm of the entire antenna surface of the antenna unit 4. is there. That is, it is preferable that the entire antenna surface of the antenna portion 4 of the IC tag 1 is located within a region within 3 cm, preferably within a region within 1 cm from the side surface of the concrete specimen.
By setting the embedding position of the entire antenna surface of the IC tag 1 to an area within 3 cm from the inner surface 11a of the mold, any one of the three-dimensional antenna surfaces of the IC tag 1 with respect to the inner surface 11a of the mold 11 can be obtained. Even when tilted in the direction, sensitivity and stability at the time of writing / reading identification information are improved.

The embedded depth of the IC tag 1 may be fixed to the concrete specimen when the ready-mixed concrete 12 placed on the molds 11 and 11 is cured. Therefore, it is preferable to embed the IC tag 1 to a depth that does not affect the IC tag 1 because it is capped or polished (see Japanese Industrial Standards JIS A 1132 “How to make a concrete strength test specimen”).
Further, if embedded too deeply, the IC tag 1 may be damaged, deteriorated, etc., and there may be a problem that the stability of the signal and workability are deteriorated. Therefore, the upper end of the IC tag 1 or the upper end of the antenna unit 4 is It is preferable to embed the raw concrete 12 to a depth of about 5 mm to 20 mm from the placement surface 12a.

In order to facilitate the embedding of the IC tag 1 into the placement surface 12a of the ready-mixed concrete 12, when the IC tag 1 is embedded to a predetermined depth, only the end portion of the substrate 2 protrudes from the placement surface 12a. Only the substrate 2 can be lengthened.
At this time, if the end of the stretched substrate 2 is marked in accordance with the embedding depth, the IC tag 1 can be easily embedded to a predetermined depth without variation among the concrete specimens.
The end portion of the substrate 2 protruding from the placement surface 12a can be easily cut if necessary after the ready-mixed concrete 12 is cured, and capping may be performed after cutting.

In addition, when the IC tag 1 is used in a lapping manner, when the IC tag 1 is embedded to a predetermined depth from the placement surface 12a, the lapping only portion is projected so that the lapping only portion protrudes from the placement surface 12a. Can also be kept long. Also here, if the stretched wrapping portion is marked in accordance with the embedding depth, the IC tag 1 can be easily embedded to a predetermined depth without variations among the concrete specimens.
The wrapping portion protruding from the placement surface 12a can be easily cut if necessary after the ready-mixed concrete 12 is cured, and capping may be performed after cutting. Further, a cut may be provided so as to facilitate cutting.
The case of using an IC tag in a bag or other container is the same as in the case of wrapping.

  The IC tag 1 may be preliminarily written with identification information related to predetermined ready-mixed concrete before placing, and the identification information related to predetermined ready-mixed concrete after the IC tag 1 is embedded in the ready-mixed concrete 12 may be used. You may write. Further, a predetermined ID may be written in advance on the IC tag 1, or the predetermined ID may be written after the IC tag 1 is embedded in the ready-mixed concrete 12.

Next, the ready-mixed concrete 12 is hardened and demolded, and then subjected to underwater curing at a specified temperature for a specified time to obtain a concrete specimen.
Thereby, the concrete test body shown in FIG. 4 is obtained.
In this concrete specimen, since the antenna surface of the antenna portion 4 of the IC tag 1 is substantially parallel to the outer peripheral surface 13a of the concrete body 13, the sensitivity and stability at the time of writing / reading identification information are improved. Yes.

Next, the information recorded on the IC tag 1 of the concrete specimen is read in a non-contact manner using an IC tag reader / writer (non-contact communication medium writing / reading device), and the concrete specimen is read based on the read information. Identify.
The IC tag reader / writer is not particularly limited but is preferably portable. The reason is that information can be easily written / read at the work site without moving a heavy concrete specimen.

In particular, in ready-mixed concrete factories and construction sites, it is necessary to prepare a large number of concrete specimens every day and store them for a predetermined period. For this reason, it is difficult to move the concrete specimen from the storage location, read the information of the IC tag 1, and identify the concrete specimen. In such a case, by using a portable IC tag reader / writer, the specimen can be easily identified on site.
In addition, in order to prevent falsification of information on the IC tag 1, it is preferable that the written information cannot be modified on the system and only information can be added.
As described above, the IC tag 1 can be easily attached to a predetermined embedding depth without variation among specimens. Therefore, it is possible to improve the accuracy and reliability of the test results obtained for each specimen and improve workability.

  Next, as an application example of the concrete specimen identification method of the present invention, two concrete management methods will be described and described.

(Management method 1)
(1) Write predetermined information on concrete to an IC tag via an IC tag reader / writer. This information may be written before or after the concrete specimen is embedded.
a) Predetermined information on concrete is input to the IC tag reader / writer and written to the IC tag.
b) Predetermined information related to concrete is input to a server, personal computer, etc., which is transmitted to an IC tag reader / writer by radio or the like and written to the IC tag.
(2) The concrete specimen embedded with the IC tag is stored (demolded, cured, etc.) in a predetermined atmosphere for a predetermined period.
(3) A concrete specimen of a predetermined age is identified by reading IC tag information with an IC tag reader / writer.
(4) A strength test is performed on a concrete specimen having a predetermined age, and the test result is associated with data read from an IC tag by an IC tag reader / writer, and the information is transmitted to a server, a personal computer, or the like.
(5) The information of (4) is managed by a server, personal computer, etc. that stores the information of (4).

According to this management method 1, the following effects can be achieved.
(1) Work such as writing characters, numbers, etc. on the mold becomes unnecessary, and work efficiency can be improved. In addition, the inconsistency between concrete and form number due to mistakes is eliminated, and the reliability of the test is improved.
(2) When the formwork is removed, there is no need to transfer characters, numbers, etc. to the concrete specimen, and work efficiency can be improved. In addition, the mismatch between the concrete and the specimen due to a transcription mistake is eliminated, and the reliability of the test is improved.

(3) A predetermined concrete specimen can be easily, accurately and reliably identified with an IC tag reader / writer.
In particular, if the IC tag reader / writer is a portable IC tag reader / writer, the information on each specimen is directly read from the IC tag, so that it is necessary immediately on the spot without exchanging information with the server. Can grasp the information.
(4) If an IC tag reader / writer and a server, a personal computer, etc. are connected by radio or the like, concrete data (quality, material, etc.) placed on a predetermined concrete specimen can be easily confirmed via an ID.
(5) Data relating to identification information can be easily stored and written.

(Management method 2)
(1) Predetermined information about concrete is stored in a server, a personal computer or the like.
(2) Write the ID number corresponding to (1) to the IC tag. The ID number may be written before or after embedding in the concrete specimen.
(3) The concrete specimen embedded with the IC tag is stored (demolded, cured, etc.) in a predetermined atmosphere for a predetermined period.
(4) A concrete specimen of a predetermined age is identified by reading IC tag ID information with an IC tag reader / writer.

(5) A strength test is performed on a concrete specimen of a predetermined age, and the test result and ID number data are transmitted to the server, personal computer, etc. that stores the information of (1) above.
(6) The information of (1) and (4) is managed in association with each other on the basis of the ID number by a server, a personal computer or the like storing the information of (1) and (4).
This management method 2 can also achieve the same effects as the management method 1 described above.

The concrete specimen identification method according to the present invention will be described with reference to examples.
As the IC tag, a rectangular passive IC tag having an overall length of 3.2 cm, a width of 1.5 cm, and a thickness of 0.3 mm was used.
This IC tag was laminated from both sides with a polyester film. The shape after lamination was a rectangle having a length of 6.0 cm, a width of 2.1 cm, and a thickness of 0.6 mm.
Concrete information about the ready-mixed concrete to be placed was written on this IC tag with a portable IC tag reader / writer.

The ready-mixed concrete was placed in three molds based on Japanese Industrial Standard JIS A 1132 “How to make a specimen for concrete strength test”.
Immediately after the placement, the IC tag in which the above data was written was inserted vertically into the ready-mixed concrete from the placement surface by a human hand. At this time, it was embedded so that the antenna part of the IC tag was parallel to the length direction of the specimen.
The IC tag was embedded in two types, 1 cm and 3 cm from the inner surface of the mold (side surface of the concrete specimen). In both cases, the IC tag was embedded so that the upper end of the tag was 0.5 cm deep from the placement surface. The remaining one did not embed an IC tag.

After 1 day from placing, the mold was removed and the top surface of the obtained concrete specimen was capped.
Thereafter, this concrete specimen was cured underwater for 28 days. Before carrying out the compressive strength test of the concrete specimen, the IC tag information was read with an IC tag reader / writer, and it was confirmed that the first written information could be read.
After the compressive strength test, the IC tag information read by the IC tag reader / writer and the result of the compressive strength test were stored in a server and compared. As a result, no significant difference was observed in the compressive strength of the three specimens, and it was found that even if an IC tag was embedded, the compressive strength test was not affected.

It is a perspective view which shows the IC tag used for the identification method of the concrete test body of one Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which shows the identification method of the concrete test body of one Embodiment of this invention. It is sectional drawing which shows the concrete test body of one Embodiment of this invention.

Explanation of symbols

1 IC tag 2 Substrate 3 IC
4 Antenna part 5 Film 11 Formwork 11a Inner surface 12 Ready-mixed concrete 12a Placing surface 13 Concrete body 13a Outer peripheral surface

Claims (8)

A method for identifying a concrete specimen using a thin plate-like non-contact communication medium in which an end of a substrate is stretched and the stretched end is marked in accordance with an embedding depth,
Place concrete in the formwork,
Next, the non-contact communication medium is embedded in the ready- mixed concrete placement surface so that the end of the substrate protrudes from the placement surface,
Next, the ready-mixed concrete is hardened and demolded, and further, the end projecting from the casting surface is cut according to the mark to obtain a concrete specimen.
Next, the information recorded in the non-contact communication medium of the concrete specimen is read in a non-contact manner using a non-contact communication medium reader, and the concrete specimen is identified based on the read information. A method for identifying concrete specimens. Identification of a concrete specimen using a thin plate-like non-contact communication medium in which a wrapping-only portion of the wrapping portion is stretched and the stretched wrapping-only portion is marked according to an embedding depth A method,
Place concrete in the formwork,
Next, the non-contact communication medium is embedded in the ready- casting surface of the ready-mixed concrete so that only the lapping portion protrudes from the placing surface,
Next, this ready-mixed concrete is hardened and demolded, and further, the part of the wrapping only protruding from the placement surface is cut according to the mark to make a concrete specimen,
Next, the information recorded in the non-contact communication medium of the concrete specimen is read in a non-contact manner using a non-contact communication medium reader, and the concrete specimen is identified based on the read information. A method for identifying concrete specimens. The method for identifying a concrete specimen according to claim 1 or 2 , wherein a distance between the antenna portion of the non-contact communication medium and the surface of the concrete specimen is within 3 cm.   4. The method for identifying a concrete specimen according to claim 1, wherein the non-contact communication medium has a length of 120 mm or less and a width of 30 mm or less.   5. The non-contact communication medium according to claim 1, wherein an integrated circuit and an antenna unit capable of writing / reading information are provided on a substrate made of a flexible organic polymer. The method for identifying a concrete specimen according to any one of the preceding claims.   The method for identifying a concrete specimen according to any one of claims 1 to 5, wherein the integrated circuit and the antenna section are covered with a film made of an organic polymer.   The method of identifying a concrete specimen according to any one of claims 1 to 6, wherein the information recorded in the non-contact communication medium is identification information of the ready-mixed concrete.   The non-contact communication medium reading device is a portable non-contact communication medium reading / writing device that performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium. The method for identifying a concrete specimen according to any one of claims 1 to 7, characterized in that:

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