JP2000035389A - Method for curing concrete sample and curing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain a sample in a good curing state in terms of moisture and temperature for a long time and to improve shock resistance on transportation by accommodating the concrete sample and water in airtight state. SOLUTION: A curing container 2 for accommodating a concrete sample 1 that is a core sample or the like being sampled from a building structure is made of, for example, plastic and is provided with a container body 3 for accommodating the sample 1 while the upper half part projects and a cover 4 for accommodating the upper half part of the sample 1. The body 3 and the cover 4 can be connected by screws or the like and the inner dimensions on connection can be increased somewhat larger that the size of the sample 1. Then, after water W is charged into the body 3, the sample 1 where a seal ring 7 is mounted is inserted, then the cover 4 is screwed to the body 3 while pinching the seal ring 7, the water W is poured in from a water supply port 5, and a cap 6 is provided for making the inside airtight. The sample 1 accommodated in this manner is set in a cured state in water by the water W in the container 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method and a container for curing a concrete specimen.

[0002]

[Prior Art] After the earthquake in the Hanshin area, seismic diagnosis of existing buildings has been actively conducted in various places.
For a reinforced concrete building, use a concrete core cutter to collect concrete specimens directly from the walls of the building, etc., and transport them to a testing laboratory, where they are compressed. Measuring strength and the like has been performed.

[0003] In order to properly perform this strength test, it is necessary to keep a concrete specimen collected at the site in a proper curing state from immediately after collection until the test is performed.

As a means for achieving this, there is a method in which a concrete specimen immediately after collection is tightly sealed and packaged with a wrap at a sampling site, and further double-closed tightly sealed with a plastic bag from above to seal and cure. In this curing method, the work of packing the concrete specimen is very troublesome, so recently, using a curing container that can fit the concrete specimen into the space, the concrete specimen is hermetically sealed in the curing container. A method of sealing and curing has been proposed (JP-A-8-50087).

[0005]

However, in the sealed curing method using the curing container as described above, the airtightness of the curing container is not always sufficient, and therefore, the concrete specimen is actually adhered with a wrap. After sealing and packaging,
Unless a method of sealingly storing the concrete specimen in a curing container is adopted, the concrete specimen cannot be kept in a proper curing state in terms of humidity.

[0006] In particular, when it takes a long time for transportation from the collection of the concrete specimen to the execution of the test, even if the concrete specimen is wrapped as described above and stored in a container, a good curing condition is obtained. Is difficult to maintain, and may cause problems such as drying of the concrete specimen before the test.

[0007] Curing conditions involve not only humidity but also temperature, but in the above-mentioned sealing curing method, there is a risk that the concrete specimen in the container is affected by a change in the temperature of the outside air. there were.

Further, during transportation from the sampling site to the laboratory,
Defects such as cracks and chips may occur in the concrete specimen in the container due to vibration and the like, and the impact resistance is not always perfect.

The present invention has been made in view of the above-mentioned conventional problems, and it is possible to keep a concrete specimen collected or removed from a mold in a good curing condition in terms of humidity and temperature for a long period of time. Further, it is an object of the present invention to provide a concrete specimen curing method and a curing container 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 object of the present invention is to use a container having a size slightly larger than the size of a concrete specimen and for holding the concrete specimen in a slippery manner, and in which the concrete specimen and water are sealed in an airtight state. Thus, the problem is solved by a method for curing a concrete specimen, wherein the concrete specimen is placed in an underwater state.

According to this method, the concrete specimen is placed in water in the container, so that the concrete specimen is cured underwater by this water, and can be kept in a good curing state for a long time in terms of humidity. it can. Moreover, the water plays a role of keeping the concrete specimen warm,
The influence of the temperature change of the outside air can be suppressed, and the concrete specimen can be kept in a good curing condition even in terms of temperature. In addition, this water functions as a cushioning material for protecting the concrete specimen from impact in the container, and is excellent in impact resistance during transportation and the like.

[0012] Further, it is possible to obtain a good curing state only by storing the concrete specimen and water in the container, and the operation is very easy.

[0013] The above-mentioned container is a curing container for a concrete specimen, which is slightly larger than the size of the concrete specimen, and which fits the concrete specimen into the space, wherein the upper side of the concrete specimen is projected upward. A container body having a cup shape for receiving the container body, and an inverted cup-shaped lid body for housing the upper side of the concrete specimen projecting from the container body, wherein the container body and the lid body are arranged in the height direction of the concrete specimen. At the intermediate portion, the concrete specimen is accommodated in a detachable manner in an airtight state, and the lid is provided with a water supply port at an upper part thereof, and the water supply port is placed in an airtight state. It is preferable to use a curing container for a concrete specimen, wherein the closing cap is detachably attached.

In this container, since the concrete specimen projects above the container main body in a state where the concrete specimen is accommodated in the container main body, the container main body after removing the lid during the strength test is removed. It is possible to easily take out the concrete test piece from the concrete.

[0015] The entire concrete test piece can be easily placed underwater while having such handling convenience. That is, after the concrete specimen is accommodated in the container body and the lid is fitted thereto, water is supplied into the interior through the water supply port of the lid, whereby the entire concrete specimen is placed in the underwater state.

[0016]

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

In FIGS. 1 and 2, 1 is a concrete specimen and 2 is a container. The concrete specimen 1 is a cylindrical core specimen collected from a building structure using a concrete core cutter.
cm and a height of 20 cm.

The container 2 is made of, for example, plastic or the like, and includes a container body 3 and a lid 4.

The container body 3 is a cup-shaped body having a bottom 3b at the lower end of a cylindrical body 3a. The height of the concrete specimen 1 is designed to be shorter than the length of the concrete specimen 1, and the upper half of the concrete specimen 1 is
Is projected upward. The inner diameter of the body 3a of the container body 3 is designed to be slightly larger than the outer diameter of the concrete specimen 1, and is set to a size such that the concrete specimen 1 fits into the body 3a. Designed. A screw 3c for screwing and connecting the lid 4 is formed on the outer periphery of the upper end of the container body 3.

The lid 4 is an inverted cup having a cylindrical body 4a. The upper part of the concrete specimen 1 projecting upward from the upper end of the container body 3 is covered with the body 4a. It is made to accommodate. At the lower end of the lid 4, a coupling ring 4b fitted to the outer peripheral side of the upper end of the container body 3 is integrally connected and formed on the inner periphery of the coupling ring 4b. By screwing the screw 4c with the screw 3c on the outer periphery of the upper end of the container main body 3, the lid 4 and the container main body 3 are integrally connected.

Further, the lid 4 is provided with a water supply port 5 on a top surface thereof, and a cap 6 for sealing the water supply port 5 in an airtight state is detachably screwed into the water supply port 5. Has been made.

The collected concrete specimen 1 is cured on site using the container 2 as described below. That is, as shown in FIG. 3A, a predetermined amount of water W is put into the container body 3. The container body 3 may be provided with a designation line for designating the amount of water W on the inner peripheral surface of the body 3a. Next, as shown in FIG. 3B, the concrete specimen 1 having the 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 body 3 raises its water level according to the volume of the concrete specimen 1 and overflows from the upper end of the container body 3, and the inside of the container body 3 Filled with water W. Next, with the seal ring 7 set on the upper end surface of the container body 3, the cover 4 is screwed into the container body 3, and the container body 3 and the cover 4
Are sealed in an airtight manner with the seal ring 7 interposed therebetween, and water W is poured into the inside through the water supply port 5 at the upper end of the lid 4 as shown in FIG. This allows
The inside of the lid 4 is also filled with the concrete specimen 1 and the water W, and the concrete specimen 1 is placed underwater in the container 2. Thereafter, as shown in FIG. 3D, the cap 6 is screwed into the water supply port 5 to make the inside of the container 2 airtight.

The concrete specimen 1 thus cured is cured underwater by the water W in the container 2.
In terms of humidity, it is kept in good condition for a long time.
Therefore, in the above-mentioned operation, it is not necessary to perform the operation of packaging the concrete specimen 1 in a wrap. Also,
The water W plays a role of keeping the concrete specimen 1 warm,
The influence of the temperature change of the outside air can be suppressed and the concrete specimen 1 can be kept in a good curing condition even in terms of temperature. Further, when the concrete specimen 1 collected at the site is transported to the testing laboratory, the water W
Works as a cushioning material to protect the concrete specimen 1 from impact, and it is possible to effectively prevent the concrete specimen 1 from generating defects such as cracks and chips due to vibration and impact during transportation.

When the concrete specimen 1 is directly cut out from the structure using a concrete core cutter and collected, the frictional heat generated at the time of collection causes the specimen 1 to be cut.
Becomes considerably high temperature, which may cause the moisture inside the concrete specimen to evaporate, etc., which may cause the compressive strength and the like to unintentionally decrease.
By adopting a method of placing the concrete specimen 1 in the container 2 in water, the temperature of the specimen can be quickly lowered to prevent evaporation of water due to frictional heat, and thereby, reliability in the strength test can be improved. High-quality test data can be obtained.

In the strength test, when the lid 4 is removed, the concrete sample 1 is placed in the upper half of the container body 3.
The test staff can easily take out the concrete specimen 1 from the container body 3.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various changes 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, a container 2 of a type in which the upper end of a container body 3 accommodating the whole of the concrete specimen 1 in a height direction is closed by a lid 4.
May be used. In the container 2, water W can be supplied to the inside of the container main body 3 by using the upper end opening as a water supply port, and the container 2 can have a simple structure with a small number of parts. Further, the container may be provided with a foil on the inner side as necessary to reduce the thermal conductivity of the container. Furthermore, in the present embodiment, the core specimens collected from the building structure are targeted, but the normal concrete specimens manufactured by pouring ready-mixed concrete into a mold, drying and solidifying, and removing the molds are also applicable. Good. Further, the shape of the concrete specimen is not limited to a columnar shape, and may be a rectangular parallelepiped shape or the like, and the container may be manufactured in a shape corresponding thereto.

[0027]

As described above, according to the method for curing a concrete specimen of the present invention, a container having a size slightly larger than the size of the concrete specimen and for allowing the concrete specimen to fit inside the concrete specimen is used. The concrete specimen is placed underwater by housing the specimen and water in an airtight state. And can be maintained in a good cured state, and also excellent in impact resistance during transportation and the like. Thereby, highly reliable test data can be obtained in the strength test. In addition, the container can be put into a good curing state only by containing the concrete specimen and water in the container, and the operation can be easily performed.

Further, since the curing container for concrete specimens of the present invention has the above-described structure, the concrete specimens are taken out of the container body after the lid is removed during the strength test. It can be easily performed, and the entire concrete specimen can be easily placed in the underwater state.

[Brief description of the drawings]

FIG. 1 shows an embodiment, and is a longitudinal sectional view showing a state in which a concrete specimen is accommodated in a container in an underwater arrangement.

FIG. 2 is a perspective view showing a concrete specimen and a container in a separated state.

FIGS. 3 (a) to 3 (d) 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 ... Lid 5 ... Water supply port 6 ... Cap W ... Water

Claims (2)

[Claims] 1. A concrete container having a size slightly larger than the size of a concrete specimen and containing the concrete specimen and water in an airtight state in a container for holding the concrete specimen in a space. A method for curing a concrete specimen, wherein the specimen is placed underwater. 2. A curing container for a concrete specimen, which is slightly larger than the size of the concrete specimen and is capable of receiving the concrete specimen as a sponge, wherein the upper side of the concrete specimen is housed in an upwardly protruding state. Cup-shaped container body, and an inverted cup-shaped lid that houses the upper side of the concrete specimen protruding from the container body, and the container body and the lid are attached and detached at the middle part in the height direction of the concrete specimen. It is designed to accommodate concrete specimens by connecting them as tightly as possible.
The lid is provided with a water supply port at an upper part thereof, and a cap for sealing the water supply port in an airtight state is detachably attached to the water supply port.