JP6763816B2 - Method for measuring the penetration depth of concrete structures and their deterioration factors - Google Patents

Description

The present invention relates to a method for measuring the penetration depth of a concrete structure and its deterioration factor.

Reinforced concrete is used as the composition of a general concrete structure. Originally, concrete is maintained in a strongly alkaline state due to its components such as calcium hydroxide. Due to this property, a passivation film is formed on the surface of the reinforcing bar in the reinforced concrete structure, and the reinforcing bar is protected from corrosion.

A phenomenon called neutralization is known in which calcium hydroxide or the like in concrete reacts with carbon dioxide in the air to generate calcium carbonate, which lowers the pH of concrete and tilts it to neutrality. When neutralization occurs and progresses, the passivation film of the reinforcing bar is destroyed and rust is likely to occur on the reinforcing bar, and the volume expands due to rusting, causing cracks in the reinforced concrete structure, and the concrete peels off, collapses, etc. Occurs. Therefore, for the maintenance of concrete structures, it is important to measure the depth of neutralization, and a method for measuring the neutralization depth has been devised so far. There is.

As a method for measuring the neutralization depth, a method shown in general JIS A 1152 “Concrete neutralization depth measurement method” or a neutralization depth measurement method described in Patent Document 1 is used as a measurement target. A drill hole is made from the surface of the concrete structure of the concrete structure, and the phenol phthalein solution is adhered to the inner surface of the drill hole. A method of measuring the neutralization depth from the surface is known.

In addition, chloride ions may permeate into concrete to rust the reinforcing bars, or sulfate ions (sulfuric acid gas) may permeate to deteriorate the concrete. For chloride ions, the penetration depth can be measured by spraying a silver nitrate solution as a color former. For sulfate ions, the permeation depth can be measured by analyzing the cross section with EPMA or the like.

Japanese Unexamined Patent Publication No. 2010-23583

However, the method for measuring the permeation depth of deterioration factors described in Patent Document 1 is a destructive inspection in which a hole is made in a part of the concrete structure to be measured, so that there is a problem that the aesthetic appearance of the concrete structure is spoiled. there were.

The present invention has been made to solve such a problem, and in particular, a concrete structure capable of measuring the penetration depth of a deterioration factor such as carbon dioxide without destroying the measurement target by a simple process. An object of the present invention is to provide a method for measuring the penetration depth of an object and its deterioration factor.

In order to solve the above problems, the method for measuring the penetration depth of the deterioration factor according to the present invention includes a first container and a second container housed inside the first container, and the first container has an inner diameter portion. The second container uses a deterioration factor penetration depth measuring container that has a female threaded part and a male threaded part that can be screwed into the female threaded part on the outer diameter, and the deterioration factor penetration depth measuring container is made of concrete. The process of installing on the structure, the process of collecting a sample equivalent to the material of the concrete structure body of the concrete structure, and the process of collecting the collected sample in the second container so as to have a sample surface exposed to the surrounding environment. A step of accommodating the second container inside the first container by screwing the male threaded portion of the second container into the female threaded portion of the first container, and a step of accommodating the second container from the first container after a predetermined period of time has elapsed. 2 The step of taking out the container and the step of measuring the penetration depth of the deterioration factor from the sample surface of the sample contained in the second container are included.

In addition, the steps of measuring the penetration depth of the deterioration factor from the sample surface of the sample include a step of cutting the sample in a direction perpendicular to the sample surface, a step of attaching a color former to the cross section of the cut sample, and a cross section. Of these, a step of measuring the penetration depth of the deterioration factor based on the position of the boundary between the portion where the color-developing agent develops and the portion where the color-developing agent does not develop may be included.
Further, the second container is formed of a transparent material, and the step of accommodating the sample in the second container includes a step of installing at least one rod-shaped member in the sample so as to be pullable, and the deterioration of the sample from the sample surface. The steps of measuring the penetration depth of the factor include the step of pulling out the rod-shaped member from the sample, the step of injecting the color former into the hole formed in the sample by pulling out the rod-shaped member, and the step of coloring the color-developing agent in the hole. It may include a step of measuring the penetration depth of the deterioration factor based on the position of the boundary between the portion that has been colored and the portion that has not developed color.
Further, the second container includes at least one groove for exposing the sample and a closing member that closes the groove and is removable from the groove. In the step of accommodating the sample in the second container, the closing member closes the groove. The steps of measuring the penetration depth of the deterioration factor from the sample surface of the sample are the step of removing the closing member, the step of injecting the coloring agent into the groove, and the part of the groove where the coloring agent developed and the part where the coloring did not develop. It may include a step of measuring the penetration depth of the deterioration factor based on the position of the boundary with and.
Further, the sample surface and the concrete surface of the concrete structure may be aligned at a common position.
Further, the sample may be any one of concrete, mortar or paste.

Further, the concrete structure according to the present invention is housed in a concrete structure main body, a container for measuring the penetration depth of a deterioration factor having a second container housed in the first container and the first container, and a second container. The first container has a female threaded portion on the inner diameter, the second container has a male threaded portion on the outer diameter that can be screwed into the female thread, and the first container has a concrete structure. The second container is housed inside the first container by being embedded in the main body of the object and the male threaded part of the second container is screwed into the female threaded part of the first container, and the second container is from the first container. It can be taken out and the sample is equivalent to the material of the concrete structure body.

In addition, the second container may be made of a transparent material, and at least one rod-shaped member may be placed on the sample so as to be pullable.
In addition, the second container may include at least one groove for exposing the sample and a closing member that closes the groove and is removable.
Further, the second container may be ceramics.

According to the method for measuring the penetration depth of a deterioration factor according to the present invention, the method for measuring the penetration depth of a deterioration factor according to the present invention includes a first container and a second container housed inside the first container. The process of installing the deterioration factor penetration depth measurement container on the concrete structure using the deterioration factor penetration depth measurement container, and the process of collecting a sample equivalent to the material of the concrete structure body of the concrete structure. A step of accommodating the collected sample in the second container so as to have a sample surface exposed to the surrounding environment, a step of removing the second container from the first container after a lapse of a predetermined period, and a step of accommodating the sample in the second container. Since the step of measuring the penetration depth of the deterioration factor from the sample surface of the sample is included, the penetration depth of the deterioration factor can be measured by a simple step without destroying the measurement target.

It is a front view of the neutralization depth measuring container which concerns on Embodiment 1 of this invention. It is a top view of the neutralization depth measuring container 1 shown in FIG. 1a. It is sectional drawing along the line AA of the neutralization depth measuring container shown in FIG. 1a. It is a perspective view of the sample container which concerns on Embodiment 1 of this invention. It is the schematic when the neutralization depth measuring container shown in FIG. 1a is provided in a concrete structure. It is the schematic when the neutralization depth measuring container shown in FIG. 1a is provided in a concrete structure. It is the schematic when the neutralization depth measuring container shown in FIG. 1a is provided in a concrete structure. It is the schematic when the neutralization depth measuring container shown in FIG. 1a is provided in a concrete structure. It is sectional drawing when the neutralization depth measuring container shown in FIG. 2 is installed in concrete. It is sectional drawing at the time of taking out a sample container from a neutralization depth measuring container shown in FIG. 7. It is a schematic diagram at the time of measuring the neutralization depth of the sample container which concerns on Embodiment 1 of this invention. It is the schematic of the modification which measures the neutralization depth of the sample container which concerns on Embodiment 1 of this invention. It is a top view of the sample container which concerns on Embodiment 2 of this invention. It is a perspective view of the sample container which concerns on Embodiment 2 of this invention. It is a perspective view at the time of measuring the neutralization depth of the sample container which concerns on Embodiment 2 of this invention. It is a top view of the sample container which concerns on Embodiment 3 of this invention. It is a perspective view of the sample container which concerns on Embodiment 3 of this invention. It is a perspective view at the time of measuring the neutralization depth of the sample container which concerns on Embodiment 3 of this invention.

Embodiment 1.
Hereinafter, the first embodiment of the present invention will be described with reference to the accompanying drawings, where the measurement of the neutralization depth is given as an example of the measurement of the penetration depth of the deterioration factor.
As shown in FIG. 1, the neutralization depth measuring container 1 includes a known ceramic insert 10 which is generally installed as a mounting portion of a metal fitting or the like when placing concrete. The ceramic insert 10 has a cylindrical shape and is made of ceramic. Further, the ceramic insert 10 has a rubber packing 13.

As shown in FIG. 2, a cylindrical sample container 20 is housed inside the ceramic insert 10. The sample container 20 is made of ceramic. Further, the sample container 20 is formed so that the male screw 21 provided on the outer diameter portion of the sample container 20 is screwed into the female screw 14 provided on the inner diameter portion of the ceramic insert 10. That is, the ceramic insert 10 constitutes a tubular first container, and the sample container 20 constitutes a tubular second container. Here, the longitudinal direction B of the sample container 20 is indicated by an arrow.

As shown in FIGS. 2 and 3, the sample container 20 is filled and housed with the sample 30. The sample 30 is a sample equivalent to the material of the concrete structure main body of the concrete structure to be measured, which will be described later. One end of the sample container 20 is in an open state, and the sample 30 is exposed to the surrounding environment at one end. Further, as shown in FIG. 3, the sample container 20 is provided with a take-out hole 25 for taking out the sample container 20 from the ceramic insert 10.

Next, the method for measuring the neutralization depth of this embodiment will be described.
First, the ceramic insert 10 is installed in the same manner as when a known ceramic insert is installed at the time of construction of a concrete structure.

Specifically described below, in order to provide the neutralization depth measuring container 1 in a concrete structure composed of reinforced concrete, as shown in FIG. 4, it is known to be used for placing concrete. The formwork 40 is provided at the casting location. The mold 40 is provided with a mold hole 41 at a position where the neutralization depth measuring container 1 is provided. The inner diameter of the ceramic insert 10 in the uncontained state of the sample container 20 is aligned with the mold hole 41, and the bolt 50 is inserted into the mold hole 41 and the ceramic insert 10. The ceramic insert 10 is fixed to the mold 40 by screwing the bolt 50 and the female screw 14 (see FIG. 2).

Next, as shown in FIG. 5, concrete is poured into the formwork 40 by a known means. The concrete structure main body 62 is composed of the concrete cast in the formwork 40. Then, the concrete structure 60 is formed by the concrete structure main body 62 and members such as reinforcing bars (not shown). At this time, a part of the material of the concrete structure main body 62 of the concrete structure 60 is sampled as a sample 30 as being equivalent to the material of the concrete structure main body 62. The form of the sample 30 may be concrete, mortar, or paste. Examples of the material equivalent to the material of the concrete structure main body 62 include a material obtained by removing the coarse aggregate from the material of the concrete structure main body 62, and a cement composition separately prepared with at least the same water-cement ratio. Next, as shown in FIG. 6, after the concrete structure 60 is hardened, the bolt 50 is removed, and the formwork 40 and the rubber packing 13 are removed. As a result, the ceramic insert 10 is installed in the concrete structure 60 as shown in FIG.

Next, as shown in FIG. 8, the sample container 20 containing the sample 30 is screwed into the ceramic insert 10 and fixed with the female screw 14 and the male screw 21 to be stored. As a result, the sample surface 31 of the sample 30 and the concrete surface 61 of the concrete structure 60 are aligned at a common position, and are installed in a state of being exposed to the same surrounding environment 70 (for example, an outdoor environment). Since the penetration depth is measured, the sample surface 31 is prevented from protruding from the concrete surface 61 of the concrete structure 60.

Next, as shown in FIG. 9, after a predetermined period of time has elapsed from the placement of the concrete structure 60, a tool is inserted into the take-out hole 25 (see FIG. 3) in order to measure the neutralization depth. The sample container 20 is taken out from the ceramic insert 10 by the means of. Next, as shown in FIG. 10, the sample 30 is cut perpendicular to the sample surface 31, that is, parallel to the longitudinal direction B. Then, the phenolphthalein solution 80 is attached to each of the cross sections 32 where the sample 30 is exposed. The phenolphthalein solution 80 constitutes a color former. The phenolphthalein solution 80 can have any concentration, but a 1% phenolphthalein solution is generally used.

As is known, when a phenolphthalein solution is attached to concrete, the part of the concrete in which neutralization does not occur and the alkalinity is maintained develops a red color. In addition, the concrete part that has been neutralized and has lost its alkalinity does not develop color. Therefore, when the phenolphthalein solution 80 is attached to the sample 30 in the first embodiment, the non-neutralized portion develops a red color, and the neutralized portion does not develop a color. .. Since the sample 30 is cut parallel to the longitudinal direction B, the position can be measured as the position of the neutralization depth by checking the distance from the sample surface 31 where the color is not developed.

The sample 30 is equivalent to the concrete structure 60 collected from the concrete structure 60, and the sample surface 31 and the concrete surface 61 are aligned at a common position and exposed to the same surrounding environment 70. It is a sample. Therefore, if the neutralization depth of the sample 30 can be measured, it can be assumed that the neutralization of the concrete structure 60 has progressed to the same neutralization depth. That is, the neutralization depth of the sample 30 from the sample surface 31 can be measured as the neutralization depth of the concrete structure 60 from the concrete surface 61.

The ceramic insert 10 after the measurement may contain another sample container 20 again, may be left in the concrete structure 60, or may be used for other purposes as a general insert. Such a ceramic insert 10 does not particularly lower the strength of the concrete structure, and has an advantage that there are few aesthetic problems in terms of durability because a large hole is not formed in the concrete structure 60. Further, unlike the conventional neutralization depth measurement method, the work steps such as drilling a hole in the completed concrete structure 60 and collecting the core are not required, the work man-hours are reduced, and the cost is significantly reduced.

As described above, the method for measuring the penetration depth of the deterioration factor according to the first embodiment is the neutralization depth measuring container 1 including the ceramic insert 10 and the sample container 20 housed inside the ceramic insert 10. A step of installing the neutralization depth measuring container 1 in the concrete structure 60, a step of collecting a sample 30 equivalent to the concrete structure main body 62 of the concrete structure 60, and a step of collecting the collected sample 30 in the surrounding environment. A step of accommodating the sample container 20 so as to have the sample surface 31 exposed to 70, a step of taking out the sample container 20 from the ceramic insert 10 after a lapse of a predetermined period, and a sample surface of the sample 30 housed in the sample container 20. Since the step of measuring the neutralization depth from 31 is included, the neutralization depth can be measured by a simple step without destroying the concrete structure 60 to be measured.

The steps of measuring the neutralization depth of the sample 30 from the sample surface 31 include a step of cutting the sample 30 in a direction perpendicular to the sample surface 31 and a phenol phthalein on each cross section 32 of the cut sample 30. Since the step of adhering the solution 80 and the step of measuring the neutralization depth based on the position of the cross section 32 in which the phenolphthalein solution 80 did not develop color are included, the concrete structure to be measured can be measured by a simple step. The neutralization depth can be measured without destroying 60.

Further, since the sample surface 31 and the concrete surface 61 are aligned at a common position, the neutralization depth of the sample 30 can be measured as it is as the neutralization depth of the concrete structure 60.

Further, since the sample 30 may be any one of concrete, mortar, and paste, the sample 30 that can be easily contained in the sample container 20 can be selected.

Further, the concrete structure according to the first embodiment includes a concrete structure main body 62, a neutralization depth measuring container 1 having a ceramic insert 10 and a sample container 20 housed in the ceramic insert 10, and a sample container 20. The ceramic insert 10 is embedded in the concrete structure body 62, the sample container 20 can be taken out from the ceramic insert 10, and the sample 30 is equivalent to the material of the concrete structure body 62. Also, since the sample container 20 is made of ceramics, the neutralization depth can be easily measured without destroying the concrete structure 60.

In the first embodiment, the sample 30 was cut perpendicular to the longitudinal direction, but as shown in FIG. 11, the sample 30 is cut parallel to the sample surface 31 together with the sample container 20, that is, with respect to the longitudinal direction B. It may be cut vertically in a so-called round slice state a plurality of times. Next, the phenolphthalein solution 80 is attached to the cross section 33 of the sample 30, and the position of the boundary between the portion where the phenolphthalein solution 80 develops the color and the portion where the color does not develop is determined by the neutralization depth from the sample surface 31. Measure as a position.

Embodiment 2.
Next, the method for measuring the neutralization depth of the second embodiment of the present invention will be described. In the following embodiments, the same reference numerals as those shown in FIGS. 1 to 11 are the same or similar components, and thus detailed description thereof will be omitted. Further, in order to make the description easier to understand, the description of the take-out hole 25 is omitted in the following drawings.
In the second embodiment, the sample container of the first embodiment is changed to a transparent one.

As shown in FIGS. 12a and 12b, the sample container 20a is made of a transparent material such as resin. Before filling the sample container 20a with the sample 30, stainless rods 22a to 22d extending in the longitudinal direction B of the sample container 20a and to which a mold release agent such as grease is previously applied are arranged so as to be in contact with the inner diameter of the sample container 20a. .. The stainless steel rods 22a to 22d form a rod-shaped member. Further, the lengths of the stainless steel rods 22a to 22d are slightly longer than the length of the sample 30 in the longitudinal direction B. After that, by filling the sample 30, the stainless rods 22a to 22d are placed on the outer diameter of the sample 30 in a state of slightly protruding from the sample surface 31. That is, the stainless steel rods 22a to 22d are installed so that they can be pulled out from the sample 30 by grasping the ends thereof with a tool or the like. Further, the sample container 20a may have sufficient transparency so that the sample 30 can be observed from the outside thereof. Other configurations are the same as those in the first embodiment.

When the sample 30 is installed in the concrete structure 60, the sample container 20a filled and contained in the sample 30 is housed in the ceramic insert 10 installed in the concrete structure 60, as in the first embodiment. Next, after a predetermined period of time has elapsed, the sample container 20a is taken out from the ceramic insert 10.

Next, as shown in FIG. 12c, the stainless rod 22a is pulled out from the sample 30. Then, a hole 23a is formed between the sample container 20a and the sample 30 where the stainless steel rod 22a was located. Since the sample container 20a is transparent, the hole 23a can be observed from the outside. The phenolphthalein solution 80 is injected into the hole 23a and attached to the sample 30. Next, the sample 30 is observed from the hole 23a, and the position of the boundary between the portion where the phenolphthalein solution 80 is colored and the portion where the color is not developed is measured. The position of this boundary is the neutralization depth from the sample surface 31 in the sample 30.

As in the first embodiment, it is considered that the neutralization depth from the concrete surface 61 in the concrete structure 60 is progressing in the same manner as the neutralization depth from the sample surface 31 in the sample 30. That is, by measuring the neutralization depth from the surface of the concrete structure 60 based on the position of the boundary, the neutralization depth progressing to the concrete structure 60 is measured as in the first embodiment. be able to.

After the neutralization depth inspection in the hole 23a is completed, the sample container 20a is returned to the ceramic insert 10. Next, the sample container 20a is housed in the ceramic insert 10 for a predetermined period until the next measurement time of the neutralization depth. Since the remaining three stainless steel rods 22b to 22d are embedded in the sample 30, the stainless steel rods 22b to 22d are pulled out at an arbitrary measurement time, and the phenolphthalein solution 80 is injected into the holes 23b to 23d. The neutralization depth can be measured three times separately. That is, in the second embodiment, by installing the neutralization depth measuring container 1 in the concrete structure 60, it is possible to measure the neutralization depth four times, which is the number of the stainless rods 22a to 22d. It is possible to measure the neutralization depth for a long period of time with one neutralization depth measuring container 1.

As described above, in the method for measuring the neutralization depth according to the second embodiment, at least one sample container 20a is formed in the sample container 20a in the step of accommodating the sample 30 in the sample container 20a. After the step of installing the rod-shaped members 22a to 22d so that they can be pulled out, the step of taking out the sample 30 from the sample container 20a, the step of pulling out the rod-shaped members 22a to 22d from the sample 30, and the step of pulling out the rod-shaped members 22a to 22d, the sample 30 Based on the step of injecting the phenolphthaline solution 80 into the holes 23a to 23d formed in the holes 23a to 23d, and the position of the boundary between the portion of the holes 23a to 23d where the phenolphthalein solution 80 developed the color and the portion where the color did not develop. Since the step of measuring the neutralization depth is included in the above, it is possible to measure the progress of the neutralization depth over a long period of time with one neutralization depth measuring container 1.

Further, in the concrete structure according to the second embodiment, since the sample container 20a is formed of a transparent material and the rod-shaped members 22a to 22d are retractably installed in the sample 30, one neutralization depth is provided. With the sample measuring container 1, the progress of the neutralization depth over a long period of time can be measured.

In the second embodiment, the four stainless steel rods 22a to 22d are provided, but the number of stainless steel rods may be any number required for the neutralization depth measurement. Further, the length and shape of the stainless rods 22a to 22d may be arbitrarily shortened as needed, or different shapes may be used. Further, instead of the stainless steel rods 22a to 22d, rods made of another material that is less likely to cause rust or corrosion and can be easily pulled out from the sample 30 may be used.

Alternatively, a method may be used in which a scale is provided on the sample container 20a and the boundary position between the portion where the phenolphthalein solution 80 is colored and the portion where the color is not developed is measured by the scale when measuring the neutralization depth. This facilitates the measurement of the boundary position between the colored portion and the non-colored portion.

Embodiment 3.
Next, the method for measuring the neutralization depth according to the third embodiment of the present invention will be described.
In the third embodiment, the sample container of the first embodiment is changed to one having a groove.

As shown in FIGS. 13a and 13b, the sample container 20b is provided with grooves 24a to 24d extending in the longitudinal direction B over the length thereof at equal intervals in the circumferential direction. The grooves 24a to 24d communicate the outer diameter and the inner diameter of the sample container 20b, and are formed in a wedge shape having a narrow width on the inner diameter side. Further, the closing members 24e to 24h, which are made of the same material as the sample container 20b and can be fitted into the groove portions 24a to 24d to close the groove portions 24a to 24d, are provided. When the sample container 20b is filled with the sample 30 and contained, the groove portions 24a to 24d are closed by the closing members 24e to 24h. Other configurations are the same as those in the first embodiment.

When the sample 30 is installed in the concrete structure 60, the sample container 20b filled with the sample 30 is placed in the state where the grooves 24a to 24d are closed by the closing members 24e to 24h, as in the first embodiment. It is housed in the ceramic insert 10 installed in the concrete structure 60. Next, after a predetermined period of time has elapsed, the sample container 20b is taken out from the ceramic insert 10.

Next, as shown in FIG. 13c, the closing member 24e is pulled out from the groove portion 24a. Since the groove portion 24a and the closing member 24e are formed in a wedge shape having a narrow inner diameter side, the closing member 24e can be easily pulled out. The groove portion 24a exposes the sample 30 to the outer diameter portion of the sample container 20b. As a result, the sample 30 can be observed from the outside of the sample container 20b. The phenolphthalein solution 80 is injected into the groove 24a and adhered to the sample 30.

Next, the sample 30 is observed, and the position of the boundary between the portion where the phenolphthalein solution 80 is colored and the portion where the color is not developed is measured from the sample surface 31. The position of this boundary is the neutralization depth from the sample surface 31 in the sample 30. As in the first embodiment, the neutralization depth advancing to the concrete structure 60 can be measured based on the position of this boundary.

After the neutralization depth inspection in the groove portion 24a is completed, the groove portion 24a is closed by the closing member 24e. Next, the sample container 20b is returned to the ceramic insert 10. Then, the sample container 20b is housed in the ceramic insert 10 for a predetermined period until the next measurement time of the neutralization depth. Since the remaining three grooves 24b to 24d are provided in the sample 30, the closing members 24f to 24h are pulled out at an arbitrary measurement time, and the phenolphthalein solution 80 is injected into the grooves 24b to 24d three times separately. Measurement of neutralization depth can be performed. That is, in the third embodiment, by installing the neutralization depth measuring container 1 in the concrete structure 60, it is possible to measure the neutralization depth four times, which is the number of the grooves 24a to 24d. The neutralization depth can be measured for a long period of time in one neutralization depth measuring container 1.

As described above, in the neutralization depth method for the third embodiment, the sample container 20b closes at least one groove 24a to 24d for exposing the sample and the groove 24a to 24d, and the closing member 24e is removable from the groove. In the step of accommodating the sample in the sample container 20b, the closing members 24e to 24h close the grooves 24a to 24d, and after the step of taking out the sample container 20b from the ceramic insert 10, the closing members 24e to 24h are removed. The neutralization depth is defined as the position of the boundary between the step of injecting the phenolphthaline solution 80 into the grooves 24a to 24d and the portion of the grooves 24a to 24d in which the phenolphthalein solution 80 is colored and the portion not colored. Since it includes a step, it is possible to measure the progress of the neutralization depth over a long period of time with one neutralization depth measuring container 1.

Further, in the concrete structure according to the third embodiment, the sample container 20b has at least one groove 24a to 24d for exposing the sample 30 and a removable closing member 24e to 24h for closing the groove 24a to 24d. Since it is provided, it is possible to measure the progress of the neutralization depth over a long period of time with one neutralization depth measuring container 1.

In the third embodiment, the four groove portions 24a to 24d are provided, but the number of the groove portions may be any number necessary for the neutralization depth measurement. Further, the lengths of the grooves 24a to 24d may be arbitrarily shortened as needed. Further, although the closing members 24e to 24h are made of the same material as the sample container 20b, a closing member made of another material that is hard to corrode and can be easily pulled out from the grooves 24a to 24d may be used.

In the first to third embodiments, the sample containers 20, 20a, and 20b were housed in the known ceramic insert 10, but they have a shape similar to that of the ceramic insert 10, and the sample containers 20, 20a, and 20b are housed. Possible off-the-shelf or specially designed tubular members may be used. Further, instead of the ceramic insert 10, an insert made of a non-ceramic material such as stainless steel may be used. However, from the viewpoint of corrosion resistance and strength, it is preferable to use a ceramic insert having the same thermal expansion and high adhesion to concrete. In particular, for the sample containers 20, 20a and 20b, it is preferable to use ceramic so that deterioration factors from the interface do not enter. Further, the ceramic insert 10 does not have to be provided with the rubber packing 13.

Further, male threads 21 are provided on the outer diameters of the sample containers 20, 20a, and 20b over the entire length of the longitudinal direction B, and female threads 14 are provided inside the ceramic insert 10 over the entire length of the longitudinal direction B. However, the length of the male screw 21 and the female screw 14 may be any length as long as the sample containers 20, 20a, and 20b can be accommodated in the ceramic insert 10, and the length may be any length without the screw. Good.

Further, the sample containers 20, 20a, and 20b have a configuration in which the bottom portion on one side in the longitudinal direction B is closed, but the bottom portions on both sides may be open. Further, although the ceramic insert 10 and the sample containers 20, 20a and 20b are cylindrical, they may have any shape other than the cylindrical shape such as a square cylinder.

Further, although only one sample 30 was installed in the concrete structure 60, by preparing a plurality of the same samples in advance and exposing them to the same surrounding environment 70 as the concrete structure 60. , Can be used as a replacement sample 30. Further, although the sample 30 was a sample collected at the time of placing the concrete structure 60, a separately prepared sample having the same composition as the concrete structure 60 may be used.

Further, in the first to third embodiments, the neutralization depth test of the concrete structure 60 was performed as the permeation depth measurement of the deterioration factor, but the reagent was changed from the phenolphthalein solution 80 in the same method. , EPMA and wet composition analysis can be used to perform other tests such as chloride ion permeation depth and sulfate ion permeation depth. Further, in the first to third embodiments, the sample surface 31 and the concrete surface 61 are exposed to the outdoor environment, but the measurement may be performed in another environment such as an indoor environment.

1 Neutralization depth measurement container (deterioration factor penetration depth measurement container), 10 Ceramic insert (first container), 20, 20a, 20b Sample container (second container), 22a to 22d Stainless steel rod (rod-shaped member) , 23a-23d hole, 24a-24d groove, 24e-24h closure member, 30 sample, 31 sample surface, 60 concrete structure, 61 concrete surface, 62 concrete structure body, 70 ambient environment, 80 phenol phthalein solution (Color former).

Claims (10)

The first container and
The second container housed inside the first container and
The first container has a female threaded portion on the inner diameter portion, and the second container has a male threaded portion on the outer diameter portion that can be screwed into the female threaded portion. Use,
The process of installing the permeation depth measuring container of the deterioration factor on the concrete structure and
The process of collecting a sample equivalent to the material of the concrete structure body of the concrete structure, and
A step of accommodating the collected sample in the second container so as to have a sample surface exposed to the surrounding environment.
A step of accommodating the second container inside the first container by screwing the male screw portion of the second container into the female screw portion of the first container.
A step of taking out the second container from the first container after a lapse of a predetermined period, and
A method for measuring the penetration depth of a deterioration factor, which comprises a step of measuring the penetration depth of the deterioration factor from the sample surface of the sample contained in the second container. The step of measuring the penetration depth of the deterioration factor from the sample surface of the sample is
The step of cutting the sample and
A step of attaching a color former to each cross section of the cut sample, and
The method for measuring the penetration depth of a deterioration factor according to claim 1, further comprising a step of measuring the penetration depth of the deterioration factor based on the position of a cross section in which the color former does not develop color. The first container and
The second container housed inside the first container and
Using a container for measuring the penetration depth of deterioration factors equipped with
The process of installing the permeation depth measuring container of the deterioration factor on the concrete structure and
The process of collecting a sample equivalent to the material of the concrete structure body of the concrete structure, and
A step of accommodating the collected sample in the second container so as to have a sample surface exposed to the surrounding environment.
A step of taking out the second container from the first container after a lapse of a predetermined period, and
Including a step of measuring the penetration depth of the deterioration factor from the sample surface of the sample contained in the second container.
The second container is made of a transparent material and is made of a transparent material.
The step of accommodating the sample in the second container is
Includes a step of pulling out and installing at least one rod-shaped member on the sample.
The step of measuring the penetration depth of the deterioration factor from the sample surface of the sample is
The step of pulling out the rod-shaped member from the sample and
A step of injecting a color former into a hole formed in the sample by pulling out the rod-shaped member,
Step a penetration depth measuring method of degradation factors including measuring the penetration depth of the deterioration factor on the basis of the position of the boundary between the portion where color former is not colored with a color portion of the hole. The first container and
The second container housed inside the first container and
Using a container for measuring the penetration depth of deterioration factors equipped with
The process of installing the permeation depth measuring container of the deterioration factor on the concrete structure and
The process of collecting a sample equivalent to the material of the concrete structure body of the concrete structure, and
A step of accommodating the collected sample in the second container so as to have a sample surface exposed to the surrounding environment.
A step of taking out the second container from the first container after a lapse of a predetermined period, and
Including a step of measuring the penetration depth of the deterioration factor from the sample surface of the sample contained in the second container.
The second container includes at least one groove that exposes the sample, and a closing member that closes the groove and is removable from the groove.
In the step of accommodating the sample in the second container,
The closing member closes the groove and
The step of measuring the penetration depth of the deterioration factor from the sample surface of the sample is
The process of removing the closing member and
The process of injecting a color former into the groove and
Process and the including degradation penetration depth measuring method factors for measuring the penetration depth of the deterioration factor on the basis of the position of the boundary between the portion where color former is not colored with a color portion of the groove. The method for measuring the penetration depth of a deterioration factor according to any one of claims 1 to 4, wherein the sample surface and the concrete surface of the concrete structure are aligned at a common position. The sample concrete, mortar or any one any one penetration depth measuring method of degradation factors placing serial to the claims 1 to 5 consisting of a paste. The concrete structure body and
A penetration depth measuring container deterioration factors with second container which is accommodated in the first container and the first container,
A sample contained before Symbol second container
Have,
The first container has a female screw portion provided on the inner diameter portion, and has a female screw portion.
The second container has a male screw portion provided on the outer diameter portion so as to be screwable to the female screw portion.
Before Symbol first container is embedded in the concrete structure body,
The second container is housed inside the first container by screwing the male screw portion of the second container into the female screw portion of the first container.
Before Stories second container is removable from said first container,
Before SL samples concrete structure is equivalent to the material of the concrete structure itself. The concrete structure body and
A container for measuring the penetration depth of a deterioration factor having a first container and a second container housed in the first container,
With the sample contained in the second container
Have,
The first container is embedded in the concrete structure body and
The second container can be taken out from the first container,
The sample is equivalent to the material of the concrete structure body,
The second container is formed of a material having transparency, it is placed on the sample to be pulling at least one rod member Turkey Nkurito structure. The concrete structure body and
A container for measuring the penetration depth of a deterioration factor having a first container and a second container housed in the first container,
With the sample contained in the second container
Have,
The first container is embedded in the concrete structure body and
The second container can be taken out from the first container,
The sample is equivalent to the material of the concrete structure body,
The second container, at least one groove exposing the sample, Turkey Nkurito structure and a removable closure member with close the groove. The concrete structure according to any one of claims 7 to 9, wherein the second container is made of ceramics.

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