JP3592212B2 - Concrete neutralization measurement method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for measuring carbonation of concrete used for diagnosing the degree of deterioration of concrete in a concrete structure.
[0002]
[Prior art]
Concrete loses alkalinity by the action of carbon dioxide in the air and gradually neutralizes from the surface. When the concrete is neutralized, it loses its rust-preventing effect on the reinforcing steel, and the corrosion of the reinforcing steel progresses, losing the required strength, and at the same time, expanding and destroying the concrete. For concrete structures, therefore, it is extremely important to measure the depth of concrete neutralization from the concrete surface to understand the degree of deterioration. It can be determined whether or not the carbonization has reached, and how close the carbonization has progressed to the rebar.
[0003]
When measuring the neutralization depth of such concrete, generally, a core having a diameter of about 3 to 10 cm is extracted from the concrete, and a reagent such as a phenolphthalein solution is sprayed on the core, so that the concrete surface is neutralized. The depth of sexual development is measured. However, in this method, a relatively large-diameter core is extracted, so that the building is greatly damaged. In addition, since water is used for the core cutter, there is a problem that the site becomes dirty.
[0004]
In order to solve the above-mentioned problem, a method has been proposed in which concrete is pierced by a drill, and alkalinity of concrete powder discharged at this time is measured to estimate a neutralization depth. In this method, the influence on the concrete structure is minimized by using a drill. For example, there is a method as described below.
(1) As shown in FIG. 4, the concrete 1 is pierced by a drill 2a, and the concrete powder 3 produced at this time is impregnated with a reagent (containing 1% phenolphthalein solution and 15% water). This is a method of measuring the depth of a drill hole when the filter paper is discolored with a vernier caliper or the like.
(2) As shown in FIG. 5, a tape-like adhesive member 60 in which a reagent is dropped or impregnated is disposed near the lower side of the perforated portion of the concrete 1, and the adhesive member is linked with the drilling movement of the drill 2a. 60 is moved in one direction, the concrete powder 3 generated by the perforation is continuously adhered to the adhesive member 60, and the depth of the drill hole is determined from the length of the concrete powder 3 on the adhesive member 60 when the reagent is discolored. How to know.
[0005]
[Problems to be solved by the invention]
However, the method (1) requires a perforation operation and an operation for horizontally supporting the filter paper, and two workers are required for measurement. Furthermore, the filter paper must be moved so that the discharged concrete powder can always be received on a new surface free of concrete powder, which is a cumbersome operation, and accurate measurement is difficult. There is also a risk that the operator holding the filter paper may touch the punch.
[0006]
In the above-mentioned method (2), the device is complicated and expensive, and the device is heavy and heavy. Furthermore, since the neutralization depth is determined from the length of the concrete powder on the adhesive member that is proportional to the drill hole depth, accurate measurement is difficult. In both of the methods (1) and (2), the filter paper or the like may be dried and a measurement error may occur.
[0007]
The present invention is a method for drilling concrete with a drill, measuring the alkalinity of the concrete powder discharged at this time, and estimating the neutralization depth. It is an object of the present invention to provide a concrete neutralization measuring method capable of accurately measuring the concrete neutralization depth with a lightweight device.
[0008]
[Means for Solving the Problems]
The method for measuring the neutralization of concrete according to the present invention is a method for measuring the neutralization depth of concrete by detecting the alkalinity of concrete powder discharged when drilling concrete, for example, by drilling. a plurality of containers having a bottom which is a partition plate provided so as to protrude by a predetermined length from the container top to both sides of the upper portion of the plurality of the containers, is constituted by a back plate provided on the partition switching plates Using a measuring device provided with a positioning hole for perforation at a predetermined position between the partition plates in the upper portion of each of the plurality of containers on the back plate, the partition plate sandwiches a perforated portion on the concrete surface from both sides. the enclosure and the container to secure the measuring device so as to be positioned below a predetermined position of the drilling portion of the concrete surface, add reagent (such as phenolphthalein solution) into the container Both the concrete powder is dropped into the container by piercing the piercing portion through the positioning hole of the back plate, neutralization depth of concrete by measuring the drilling depth at which the concrete powder is discolored Characteristic.
Alternatively, a bottomed plurality of containers having a portion where upper depositing concrete to the lower opening, and a partition plate provided so as to protrude by a predetermined length from the container top to both sides of the upper portion of said plurality of each container , it is composed of a back plate provided on the partition switching plates and the back plate by using a measuring apparatus provided with a positioning hole for drilling at a predetermined position of the partition plates in the upper part of each of the plurality of containers Fixing the measuring device so that the partition plate surrounds the perforated portion on the concrete surface from both sides, and the container is positioned at a predetermined position below the perforated portion on the concrete surface , and a reagent ( with add phenolphthalein solution, etc.), the perforated portion of the concrete powder is dropped into the container by piercing through the positioning hole of the back plate, concrete dust is discolored Request neutralization depth of concrete by measuring the amount of concrete dust deposition.
[0009]
It is preferable that the container for storing the reagent is a transparent container so that the discoloration of the concrete powder can be easily confirmed. Further, it is preferable that a pair of partition plates project from the upper portion of the container so as to sandwich the perforated portion, so that the concrete powder can surely fall into the container. This partition plate not only prevents scattering of the powder but also protects the wind. In addition, the height of the partition plate can be changed or a scale can be punched to determine the perforation position.
[0010]
The number of measurement points (perforation points) may be one. However, since a plurality of points are usually perforated, a plurality of points are used, and an average value of each point or an appropriately selected number of points, for example, an average value excluding the maximum value and the minimum value is used. It is preferable to obtain it. Usually, about 5 points. In this case, it is preferable that the containers are arranged side by side in accordance with the interval between the plurality of perforated portions and integrated, and that a partition plate is provided at the top of each container so as to sandwich each perforated portion.
[0011]
In addition, a back plate is provided between a pair of partition plates at the upper part of the container, a drill positioning hole is drilled in the center of the back plate, the drill is positioned by the positioning hole, and concrete powder is placed in the center of the container. It can also fall. In addition, a filter for catching concrete powder is provided in the reagent in the reagent, and the discolored concrete powder is removed, thereby making it unnecessary to replace the reagent and wash the container.
[0012]
The neutralization depth of concrete is determined by drilling a drill at the moment when the concrete powder in the container is discolored, measuring the depth of the drill hole with a vernier caliper or the like, and correcting as necessary. Alternatively, the container containing the reagent is made into a funnel-shaped container, concrete powder is deposited on the tube portion at the bottom of the container, and a scale corresponding to the depth of the drill hole is engraved on the tube portion. Determine the neutralization depth of concrete by reading the scale of concrete powder when discolored.
[0013]
In the case of a funnel-shaped container, by providing a stopper at the lower end of the tube portion, the inside of the container can be easily washed. Further, by detachably attaching the tube portion to the upper main body, it is easier to wash and the parts can be replaced.
[0014]
In the above configuration, the container is fixed below the measurement point on the concrete surface with an adhesive tape or the like, and the measurement point is pierced with a drill. When concrete powder falls into the container due to drilling and the concrete powder is neutralized, the reagent powder does not change color when the reagent is neutralized, and when the concrete powder shows alkaline, the concrete powder changes color. I do. At the moment when the discoloration occurs, the depth of the drilled hole is measured, and the depth of the drilled hole is measured with a vernier caliper or the like, or the amount of the concrete powder in the container is measured, thereby obtaining the concrete neutralization depth.
[0015]
By piercing with a drill, the depth of neutralization can be easily and inexpensively measured at a low cost, which is closer to non-destruction than that of core extraction. Further, since the container containing the reagent is fixed to the concrete surface, the measurement operation can be performed easily and safely by one person as compared with the conventional drill method using filter paper. Furthermore, it is simpler and lighter than the conventional adhesive member moving type drill method, and measures the depth of the drill hole or the amount of concrete powder when discolored, so that accurate measurement is possible. In addition, a liquid reagent can be used as a reagent, and measurement errors due to drying can be prevented.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on one embodiment shown in the drawings. This embodiment is an example in which the four sides of the east, west, south and north of the concrete foundation are measured at five points each. FIG. 1 shows an example of a measuring apparatus for implementing a method for measuring carbonation of concrete. FIG. 2 shows a modification of the measuring apparatus of FIG. FIG. 3 shows an example of a measuring device for measuring the concrete neutralization depth based on the amount of discharged concrete powder.
[0017]
In FIG. 1, a measuring apparatus 10 includes a bottomed rectangular parallelepiped container 11 having an open top, a rectangular partition plate 12 in a side view, and a reagent such as a 1% ethanol solution of phenolphthalein filled in the container 11. 13, five containers 11 and six partition plates 12 are alternately arranged side by side and integrated with an adhesive or the like.
[0018]
The five containers 11 are arranged side by side at intervals of five measurement points (perforation locations) 14, and each partition plate 12 has a lower part attached to a side surface of the container 11 and an upper part defined by a predetermined distance from the upper surface of the container 11. It is made to protrude by the length. Therefore, in each container 11, the upper portions of the pair of left and right partition plates 12, 12 surround the perforated portion 14, and all the concrete powder 3 discharged by the drilling of the drill 2a falls into the container 11, and the adjacent container 11 Never enter.
[0019]
By using a transparent plate for the container 11 and the partition plate 12, the discoloration of the concrete powder 3 in each container 11 can be easily known. It is needless to say that the shape and the like of the container and the partition plate are not limited to the illustrated example, but may be other shapes.
[0020]
The concrete neutralization depth is measured by the following procedure using the measuring device 10 having the above configuration (see FIG. 1).
(1) The measuring device 10 is set horizontally on the surface of the concrete 1 and fixed with a double-sided tape or an adhesive tape.
(2) Pour a reagent (phenolphthalein 1% ethanol solution) 13 into each container 11. The phenolphthalein solution is colorless.
(3) In this example, a middle position between the upper portions of the respective partition plates 12 is pierced by a hammer drill (a drill diameter of about 5 mm), and the concrete powder 3 is dropped into the container 11. When the concrete powder 3 is from the neutralized portion, the concrete powder 3 is not discolored by the reagent 13, and when the concrete powder 3 is from the alkaline portion, the concrete powder 3 is discolored to magenta.
(4) When the concrete powder 3 that has fallen into the container 11 turns reddish purple, the drilling is stopped and the process moves to the next measurement point.
(5) When five holes have been drilled on each side of the concrete, the depth of each drill hole is measured with a vernier caliper and recorded.
(6) An average value of three points, excluding the maximum value and the minimum value, from the measured values of five points for each surface is determined, and the average value is defined as a measured value X [mm] of the surface.
(7) The neutralization depth Y [mm] of concrete is calculated by the following equation (1).
[0021]
Y = A.X + B (1) where A and B are obtained by experiments and the like.
[0022]
As described above, the neutralization depth Y of the concrete is obtained.
FIG. 2 (a) shows the container 11 of FIG. 1 in which a positioning hole for a drill is provided. In this case, the back plate 11a on the fixed side of the container 11 is extended upward in accordance with the partition plate 12, and so on. A drilling hole 15 is formed in the hole. If such a positioning hole is provided, the tip of the drill 2a can be easily positioned, and the concrete powder 3 can be dropped to the center of the container 11, so that more accurate measurement can be performed.
[0023]
FIG. 2 (b) shows the container 11 of FIG. 1 in which the concrete powder 3 that has fallen into the container can be easily removed, and a bag-like filter 16 having an open top is mounted in the container 11 from above. I do. Since the concrete powder 3 is discolored by the measurement, removing the filter 16 and removing the concrete powder 3 eliminates the need to replace the reagent 13 and wash the container 11.
[0024]
FIG. 3 does not require the measurement of the depth of the drill hole. As shown in FIG. 3 (a), a funnel-shaped container 20 is used, and concrete powder 3 is removed from the upper inverted cone portion 20a. The concrete powder 3 is deposited on the lower bottomed pipe portion 20b. If a scale 21 is provided in the pipe portion 20b and the scale 21 is engraved in correspondence with the discharge amount of the concrete powder 3 proportional to the depth of the drill hole, the scale of the discolored concrete powder 3 is read to read the scale. You can easily know the hole depth.
[0025]
FIG. 3B shows a funnel-shaped container 20 in which a stopper 22 is provided at the lower end of the tube portion 20b. By removing the stopper 22 after the measurement, the inside of the container 20 can be easily washed. FIG. 3 (c) shows that the tube portion 20b is detachably attached to the inverted cone portion 20a, so that it is easier to wash and the parts can be replaced.
[0026]
The measurement of the concrete foundation has been described above, but it is needless to say that the present invention is not limited to this and can be applied to the measurement of other concrete.
[0027]
【The invention's effect】
Since the present invention has the above-described configuration, the following effects can be obtained.
(1) In order to fix the container containing the reagent on the concrete surface by the drill method, which is more non-destructive than the core extraction and can easily measure the neutralization depth at low cost, one person Thus, the measuring operation can be easily and safely performed, and labor saving and improvement of operation efficiency can be achieved.
(2) The measuring device is simple and lightweight, so that the cost of the device can be reduced and the workability can be improved.
(3) Since the depth of the drill hole or the amount of concrete powder when discoloration is measured, the neutralization depth can be accurately measured. In addition, a liquid reagent can be used as a reagent, and measurement errors due to drying can be prevented.
(4) Measurement at multiple points can be easily performed, and more accurate measurement can be performed.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a measuring device for implementing a method for measuring carbonation of concrete according to the present invention.
FIG. 2 is a perspective view showing a modification of the measuring device of FIG.
FIG. 3 is a perspective view showing another example of a measuring device for implementing the concrete neutralization measuring method of the present invention.
FIG. 4 is a side view showing a conventional method for measuring neutralization by a drill method using filter paper.
FIG. 5 is a perspective view showing a conventional neutralization measuring method by a drill method of moving an adhesive member.
[Explanation of symbols]
1. Concrete (concrete foundation)
2 ... Drill body 2a ... Drill 3 ... Concrete powder 10 ... Measuring device 11 ... Container 12 ... Partition plate 13 ... Reagent 14 ... Measurement point (perforation point)
15 ... Drill positioning hole 16 ... Filter 20 ... Funnel shaped container 20a ... Inverted cone part 20b ... Tube part 21 ... Scale 22 ... Faucet

Claims (2)

A method of detecting the alkalinity of concrete powder discharged when drilling concrete and measuring the neutralization depth of concrete,
A bottomed plurality of containers of an open top, and a partition plate provided so as to protrude by a predetermined length from the container top to both sides of the upper portion of the plurality of the containers, a back plate provided on the partition switching plates The measuring device provided with a positioning hole for perforation at a predetermined position between the partition plates at the upper portion of each of the plurality of containers on the back plate, and the partition plate is provided on both sides of a perforated portion on the concrete surface. And the measuring device is fixed so that the container is located at a predetermined position below the perforated point on the concrete surface , a reagent is placed in the container, and the perforated point is positioned on the back plate. the concrete powder is dropped into the container by piercing through the hole, and obtains the neutralization depth of concrete by measuring the drilling depth at which the concrete powder is discolored co Neutralization method of measuring the cleat. A method of detecting the alkalinity of concrete powder discharged when drilling concrete and measuring the neutralization depth of concrete,
A plurality of containers having a bottom provided with a portion where upper depositing concrete to the lower opening, and a partition plate provided so as to protrude by a predetermined length from the container top to both sides of the upper portion of the plurality of the containers, the A back plate provided between the partition plates, the back plate using a measuring device provided with a positioning hole for perforation at a predetermined position between the partition plates in the upper part of each of the plurality of containers , A partition plate surrounds the perforated portion of the concrete surface so as to sandwich the perforated portion from both sides, and the measuring device is fixed so that the container is located at a predetermined position below the perforated portion of the concrete surface , and a reagent is placed in the container. , the perforated portion of the concrete powder is dropped into the container by piercing through the positioning hole of the back plate, to measure the deposition amount of the concrete powder when the concrete powder discolored Neutralization measuring method of concrete and obtains the neutralization depth of concrete Ri.

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