JP4145396B2 - Curing method for concrete specimen and curing container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a curing method for a concrete specimen and a curing container.
[0002]
[Prior art]
Since the earthquake in the Hanshin region, earthquake-resistant diagnosis of existing buildings has been actively conducted in various places. Among them, for reinforced concrete buildings, a concrete core cutter is used to grasp the concrete strength of the building, A concrete specimen is collected directly from the wall of a building and transported to a laboratory where the compressive strength of the specimen is measured.
[0003]
In order to perform this strength test properly, it is necessary to keep the concrete specimen collected at the site in an appropriate curing state immediately after collection until the test is conducted.
[0004]
As a means for this, there is a method in which the concrete specimen immediately after collection is tightly sealed and wrapped in a wrap at the collection site, and further, sealed and sealed by double tightly sealed in a plastic bag. Since the work of packaging concrete specimens is very troublesome, recently, a curing container that allows the concrete specimens to fit into the interior is used, and the concrete specimens are enclosed and sealed in this curing container. A method has been proposed (JP-A-8-50087).
[0005]
[Problems to be solved by the invention]
However, in the sealing curing method using the curing container as described above, the airtightness of the curing container is not necessarily sufficient. Therefore, actually, the concrete specimen is closely sealed and sealed with a wrap, and then the curing is performed. Unless the method of hermetically storing in a container was taken, the concrete specimen could not be kept in a proper curing state in terms of humidity.
[0006]
In particular, when it takes a long period of time from transportation of concrete specimens to test implementation, such as transportation, even if the concrete specimens are wrapped and stored in a container as described above, a good curing state is maintained. It is difficult to continue and may cause problems such as drying of concrete specimens before testing.
[0007]
In addition, the curing conditions are related to temperature as well as humidity. However, in the sealing curing method as described above, there is a risk that the concrete specimen in the container may be affected by the temperature change of the outside air.
[0008]
Furthermore, during transportation from the sampling site to the laboratory, vibrations may cause defects such as cracks and chips in the concrete specimen in the container, which is not necessarily perfect for impact resistance. there were.
[0009]
In view of the conventional problems as described above, the present invention can keep a concrete specimen collected or demolded for a long period of time in a good curing state in terms of humidity and temperature, Another object of the present invention is to provide a curing method and a curing container for a concrete specimen, which are excellent in impact resistance at the time of transportation and the like, and in which the concrete specimen can be cured with good workability.
[0010]
[Means for Solving the Problems]
The above problem is to use a container that fits the concrete specimen in a slightly larger size than the size of the concrete specimen,
The concrete specimen and the water are accommodated in this container in an airtight state, and the concrete specimen is placed in an underwater arrangement, which is solved by the concrete specimen curing method.
[0011]
In this method, since the concrete specimen is placed in an underwater state in the container, the concrete specimen is cured underwater with this water and can be kept in a good cured state in terms of humidity over a long period of time. In addition, the water plays a role of keeping the concrete specimen warm, the influence of the temperature change of the outside air is suppressed, and the concrete specimen can be kept in a good curing state in terms of temperature. In addition, this water functions as a cushioning material that protects the concrete specimen from impact in the container, and is also excellent in impact resistance during transportation.
[0012]
Moreover, it can be made into a favorable curing state only by accommodating a concrete specimen and water in a container, and work is very easy.
[0013]
The above container is a curing container for a concrete specimen that is slightly larger than the size of the concrete specimen, and that allows the concrete specimen to fit into the container.
A container body including a cup-shaped container body that houses the concrete specimen with the upper side protruding upward, and an inverted cup-shaped lid that houses the upper side of the concrete specimen protruding from the container body. The concrete specimen is accommodated by detachably connecting the body to the airtight state in the middle of the height direction of the concrete specimen, and
The lid is provided with a water supply port at the upper part thereof, and a curing container for a concrete specimen is used, wherein a cap for sealing the airtight state is detachably attached to the water supply port. Is good.
[0014]
In this container, since the concrete specimen is projected above the container body in a state where the concrete specimen is accommodated in the container body, the concrete from the container body after the lid body is removed in the strength test. The specimen can be easily taken out.
[0015]
And while having such handling convenience, the whole concrete test body can be easily put into an underwater arrangement state. That is, after the concrete specimen is accommodated in the container body and the lid is fitted, the concrete specimen is entirely placed in water by supplying water to the inside through the water supply port of the lid.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0017]
1 and 2, 1 is a concrete specimen and 2 is a container. The concrete specimen 1 is a cylindrical core specimen taken from a building structure with a concrete core cutter, and the dimensions thereof are, for example, cut into a diameter of 10 cm and a height of 20 cm.
[0018]
The container 2 is made of, for example, plastic, and includes a container body 3 and a lid body 4.
[0019]
The container body 3 is a cup-shaped body having a bottom 3b at the lower end of a cylindrical body 3a. The height dimension is designed to be shorter than the length of the concrete specimen 1, and the upper half of the concrete specimen 1 is located above the container body 3 in a state where the concrete specimen 1 is accommodated in the container body 3. It is designed to protrude. In addition, the inner diameter of the body portion 3a of the container body 3 is designed to be somewhat larger than the outer diameter of the concrete specimen 1, and the dimension is such that the concrete specimen 1 fits into the body section 3a. Designed. A screw 3c for screwing and joining the lid 4 is formed on the outer periphery of the upper end of the container body 3.
[0020]
The lid body 4 has an inverted cup shape having a cylindrical body portion 4a, and the body portion 4a accommodates the upper half portion of the concrete specimen 1 protruding upward from the upper end of the container body 3 with a slipper. It is made like that. And the coupling ring part 4b fitted by the lower end part of the cover body 4 at the upper end part outer peripheral side of the container main body 3 is integrally connected, and is formed in the inner periphery of this coupling ring part 4b. By screwing the screw 4 c with the screw 3 c on the outer periphery of the upper end of the container main body 3, the lid body 4 and the container main body 3 are coupled together.
[0021]
Further, the lid 4 is provided with a water supply port 5 on the top surface thereof, and a cap 6 that closes the water supply port 5 in an airtight state is detachably screwed. Yes.
[0022]
The sampled concrete specimen 1 is brought into a cured state at the site using the container 2 as follows. That is, a predetermined amount of water W is put into the container body 3 as shown in FIG. The container main body 3 may be provided with a designation line for designating the amount of water W on the inner peripheral surface of the trunk portion 3a. Next, as shown in FIG. 3 (b), the concrete specimen 1 having a seal ring 7 made of rubber or the like attached to the outer periphery of the intermediate portion in the height direction is inserted to the bottom of the container body 3. Thereby, the water in the container main body 3 rises in the water level depending on the volume of the concrete specimen 1 and overflows outward from the upper end of the container main body 3. Filled with water W. Next, in a state where the seal ring 7 is set on the upper end surface of the container body 3, the lid body 4 is screwed into the container body 3, and the container body 3 and the lid body 4 are hermetically sealed so as to sandwich the seal ring 7. As shown in FIG. 3C, water W is poured into the interior through the water supply port 5 at the upper end of the lid 4. Thereby, the inside of the cover body 4 is also filled with the concrete specimen 1 and the water W, and the concrete specimen 1 is placed in the water in the container 2. Thereafter, as shown in FIG. 3 (d), a cap 6 is screwed into the water supply port 5 to make the inside of the container 2 airtight.
[0023]
The concrete specimen 1 placed in a cured state in this way is cured underwater by the water W in the container 2 and is kept in a good cured state for a long time in terms of humidity. Therefore, in the above operation, there is no need to perform the operation of packaging the concrete specimen 1 with a wrap. Moreover, the water W plays the role which heat-retains the concrete test body 1, can suppress | block the influence by the temperature change of external air suppressively, and can maintain the concrete test body 1 in a favorable curing state also in a temperature surface. Further, when the concrete specimen 1 collected on site is transported to the laboratory, the water W in the container 2 acts as a buffer to protect the concrete specimen 1 from impact, and the concrete specimen is subjected to vibration and impact during transportation. It is possible to effectively prevent defects such as cracks and chips in 1.
[0024]
Further, when the concrete specimen 1 is directly cut out from the structure using a concrete core cutter and collected, the specimen 1 becomes considerably hot due to frictional heat at the time of collection, and this is caused by the inside of the concrete specimen. Although it may cause moisture to evaporate and undesirably reduce the compressive strength, etc., as described above, after sampling, adopt a method of placing the concrete specimen 1 in the container 2 in an underwater state. Thus, the temperature of the specimen can be quickly lowered to prevent the evaporation of moisture due to frictional heat, thereby obtaining highly reliable test data in the strength test.
[0025]
In the strength test, when the lid 4 is removed, the concrete specimen 1 is in a state where the upper half of the concrete specimen 1 protrudes from the container body 3, and the test staff can easily remove the concrete specimen 1 from the container body 3. It can be taken out.
[0026]
Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the invention. For example, as a container used in the embodiment of the method of the present invention, as shown in FIG. 4, there is a container 2 of a type in which the upper end of a container body 3 that accommodates the entire height direction of a concrete specimen 1 is closed with a lid 4. May be used. In this container 2, water W can be supplied into the container body 3 with the upper end opening of the container body 3 as a water supply port, and the container 2 can have a simple structure with a small number of parts. In addition, the container may be devised so as to reduce the thermal conductivity of the container by applying a foil on the inside as necessary. Furthermore, in this embodiment, the target is a core specimen collected from a building structure, but it is also applicable to a normal concrete specimen manufactured by pouring ready-mixed concrete into a formwork, drying and solidifying, and demolding. Good. In addition, the shape of the concrete specimen is not limited to a columnar shape, and may be a rectangular parallelepiped shape, and the container may be manufactured in a shape corresponding thereto.
[0027]
【The invention's effect】
Depending on the above, the curing method of the concrete specimen of the present invention is a size somewhat larger than the size of the concrete specimen, and uses a container in which the concrete specimen is completely stored. Since the concrete specimen is placed underwater by storing the specimen in an airtight state, the concrete specimen collected or removed from the mold is cured for a long time in terms of humidity and temperature. In addition, it has excellent impact resistance during transportation. Thereby, highly reliable test data can be obtained in the strength test. And it can be made into a favorable curing state only by accommodating a concrete specimen and water in a container, and can work easily.
[0028]
Moreover, since the curing container for the concrete specimen of the present invention has the above-described configuration, it is easy to take out the concrete specimen from the container body after removing the lid in the strength test. In addition, the entire concrete specimen can be easily placed in the water.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a state in which a concrete specimen is accommodated in an underwater arrangement state in a container according to an embodiment.
FIG. 2 is a perspective view showing a concrete specimen and a container in a separated state.
FIGS. 3A to 3D are partial cross-sectional side views sequentially showing a procedure for housing a concrete specimen in a container.
FIG. 4 is a longitudinal sectional view showing a modified example of the container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Concrete specimen 2 ... Container 3 ... Container main body 4 ... Cover body 5 ... Water supply port 6 ... Cap W ... Water

Claims (1)

It is a curing container for a concrete specimen that is a size somewhat larger than the size of the concrete specimen, and that allows the concrete specimen to fit into the concrete,
A container body including a cup-shaped container body that houses the concrete specimen with the upper side protruding upward, and an inverted cup-shaped lid body that houses the upper side of the concrete specimen protruding from the container body. The concrete specimen is accommodated by detachably connecting the body to the airtight state in the middle of the height direction of the concrete specimen, and
The said cover body is equipped with the water supply opening in the upper part, The cap which closes this in an airtight state is attached to this water supply port so that attachment or detachment is possible, The curing container of the concrete test body characterized by the above-mentioned.

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