JP3134702U - Concrete modified waterproof construction confirmation mat and concrete modified waterproof construction confirmation tool - Google Patents

Abstract

[PROBLEMS] To easily and safely confirm whether or not concrete has been modified and waterproofed with a modified waterproofing material containing a silicate compound as a main component, without the need for excavation of the concrete. Provided are a concrete-modified waterproof construction confirmation mat and a concrete-modified waterproof construction confirmation tool capable of quantifying the amount of use.
A concrete-modified waterproof construction confirmation mat 1 characterized in that a substantially rectangular sheet having water absorption is impregnated with a pH indicator that changes color with an alkali in a colored state. In this case, the sheet is mainly made of cotton, and the pH indicator is preferably phenolphthalein. Further, the modified waterproof construction characterized in that the concrete modified waterproof construction confirmation mat 1 is sealed in a soft synthetic resin bag 3 having a sealing zipper 4 in the vicinity of the opening. This is a confirmation tool 2.
[Selection] Figure 1

Description

  The present invention relates to a mat for confirming whether or not a modified waterproofing construction of concrete has been performed with a modified waterproofing material containing a silicate compound as a main component and / or quantifying the amount of the modified waterproofing material used. And tools.

  When concrete, mortar, or the like is used for a long period of time, there is a possibility that the corrosion resistance of the internal steel material is lowered due to neutralization, or a crack is caused to cause water leakage. As a method of preventing neutralization or performing modification and / or repairing cracks, a method of applying or spraying a modified waterproofing material on the surface of concrete or the like is disclosed (for example, see Patent Document 1). .

  The modified waterproof material usually contains a silicate such as sodium silicate or lithium silicate, water glass or the like (hereinafter referred to as a silicate compound) as one of the main components, as an aqueous solution or a water suspension. Used. The silicate compound is added as a component of the modified waterproofing material or combined with calcium remaining in the concrete to form an insoluble salt of calcium silicate and has a function of filling cracks. Further, it has a function of preventing the neutralization of concrete due to the alkalinity exhibited by the silicate compound, or re-alkalizing and modifying concrete that has already been neutralized.

  However, the modified waterproof material is generally colorless and odorless, and it has been difficult to determine whether or not a construction using the modified waterproof material (hereinafter referred to as a modified waterproof construction) has been performed. Moreover, in order to know whether or not the amount of the modified waterproof material used for the construction is appropriate, there was no means or tool for quantifying the amount of the modified waterproof material used.

  Although it is not a method for confirming the construction of a concrete-modified waterproof material, a method for examining the degree of neutralization of concrete is disclosed.

  For example, the method for measuring the neutralization of concrete described in Patent Document 2 is a method for measuring the neutralization depth of concrete by detecting the alkalinity of concrete powder discharged when drilling concrete. Fix the container in the bottom of the drilling site, and obtain the neutralization depth of concrete from the drilling depth when the concrete powder dropped in the container changes color or the amount of concrete powder in the container when the color changes. This is a method for measuring the neutralization of concrete characterized by the following.

  Patent Document 3 discloses a pH indicator dye characterized in that a pH indicator that indicates pH by color development is applied to concrete and the neutralization degree of the concrete is measured, and then the dye attached to the concrete is decolorized with a decolorizer. A method for measuring the degree of neutralization of adhesive concrete is disclosed.

Japanese Patent No. 3204931 Japanese Patent Laid-Open No. 2002-40013 JP 2001-33438 A

  However, the method for determining the degree of neutralization of concrete described in the above-mentioned patent document cannot be diverted, and means or tools for easily determining whether or not the modified waterproof construction has been performed or for quantifying the amount of the modified waterproof material used. Does not exist now.

  According to the method for measuring the neutralization of concrete described in Patent Document 2, the concrete must be perforated. In order to apply to confirm whether or not the modified waterproof construction has been performed, it is necessary to drill a number of locations on the construction surface, significantly reducing the strength of the concrete, and troublesome repair of the concrete after the modified waterproof construction. It takes. In addition to a reagent such as phenolphthalein, a container, a drill, and the like are required, and the measurement method itself is complicated, and cannot be applied to the looking-up surface and the looking-down surface.

  In addition, the modified waterproof construction is carried out to prevent neutralization, and the concrete before construction is not necessarily neutralized, only the very shallow part near the surface is neutralized. Sometimes it is. In such a case, the surface of the concrete and the shallow part close to the concrete surface show alkalinity. Therefore, the reagent changes color immediately after drilling, and even if drilling is continued, the reagent remains discolored before and after the modified waterproofing construction. It is extremely difficult to find the difference.

  The method for measuring the neutralization degree of the pH indicator dye-attached concrete described in Patent Document 3 requires a decolorizing agent, which is a reducing agent such as a sulfur-containing compound, boron-containing material, metal hydride, or chlorine. Oxidizing agents such as oxo acid salts, and these decolorizing agents themselves or by-products of these decolorizing agents may cause environmental pollution such as bad odor, air pollution, and water pollution. In addition, these decolorizing agents themselves or by-products of these decoloring agents are harmful to human bodies, and further, explosive substances such as hydrogen gas and perchlorate are generated, which may endanger workers.

  Further, in the method described in Patent Document 3, decolorization is practically impossible. Most pH indicators are phthalein, sulfonephthalein or triphenylmethane compounds, but the leuco compounds produced by reduction of these are easily oxidized and easily reoxidized by oxygen in the air. This yields a colored compound. Therefore, even if it is once decolorized by the reducing agent, it is colored again. On the other hand, the phthalein-based, sulfonephthalein-based and triphenylmethane-based compounds are not easily oxidized and cannot be decolorized by most oxidizing agents. Decolorization requires extremely strong oxidizers, but such oxidizers may damage the concrete itself or promote corrosion of internal reinforcing bars and reduce the strength of concrete structures. is there.

  In view of these problems, the present invention is not a method for measuring the degree of neutralization of concrete, but can be used to determine whether or not it has been constructed with a modified waterproofing material. It is an object to provide a waterproof construction confirmation tool. In addition, it can be easily and safely discriminated, can be applied to any construction surface including the look-up surface and the look-down surface, and can be used to avoid sacrificing the strength of the concrete itself by excavation. An object of the present invention is to provide a mat and a concrete modified waterproof construction confirmation tool. It is another object of the present invention to provide a concrete modified waterproof construction confirmation mat and a concrete modified waterproof construction confirmation tool capable of quantifying the amount of use of the concrete modified waterproof material.

  In order to solve the above-mentioned problems, a concrete-modified waterproof construction confirmation mat according to claim 1 of the present invention has a substantially rectangular sheet having water absorption, and a pH indicator that changes color with alkali exhibits a color showing acidity. It is characterized by being impregnated in a colored state. Here, the color change does not represent only a color change from a specific color to another color, but includes a color change from a colorless state, a change from a color state to a colorless state, and a change in color shade. Shall be. Further, the coloration is not necessarily limited to being colored, but includes color change from colored to colorless or white.

  The concrete-modified waterproof construction confirmation mat according to claim 2 is the concrete-modified waterproof construction confirmation mat according to claim 1, wherein the sheet is a sheet mainly made of cotton. Yes.

  The concrete modified waterproof construction confirmation mat according to claim 3 is the modified waterproof construction confirmation mat according to claim 1 or 2, wherein the pH indicator is phenolphthalein. Yes.

  According to a fourth aspect of the present invention, the mat for confirming a concrete modified waterproof construction according to any one of the first to third aspects is sealed in a soft synthetic resin bag having a sealing zipper near the opening. It is a concrete modification waterproof construction confirmation tool characterized by comprising.

  After applying the concrete modification waterproof construction confirmation mat of the present invention to a part of the construction surface, the concrete modification waterproof construction is performed. After completion of construction, remove the mat for confirmation of concrete reforming waterproof construction, put it in a soft synthetic resin bag with a zipper, seal and store it. The amount of concrete-modified waterproofing material used per unit area is obtained by measuring the weight change of the concrete-modified waterproofing construction confirmation mat or the modified waterproofing construction confirmation tool before and after construction.

  The concrete modified waterproof construction confirmation mat of the present invention is impregnated with a pH indicator that changes color when exposed to alkali, so that an aqueous solution or water suspension of a concrete modified waterproofing material exhibiting alkalinity is sprayed or applied. Discolored by. Even if the construction surface is wide, by attaching the concrete reforming waterproof construction confirmation mat of the present invention, the completed construction can be easily seen, and the concrete reforming waterproof construction that was impossible in the past has been completed. Can be inspected.

  According to the concrete reforming waterproof construction confirmation mat of the present invention, there is no need to apply or spray a pH indicator directly on the construction surface, so there is no need to decolorize using a chemical substance such as a reducing agent or an oxidizing agent. . It is possible to avoid the adverse effects on the concrete, workers or environment caused by the decolorizing agent, and to perform the inspection safely.

  It can be used simply by placing it on the look-down surface, and it can be easily attached to other look-up surfaces, vertical surfaces, etc. by simply locking it with a fastening material such as a lath fitting, nail, staple or tape. Can be used. Furthermore, there is no risk of sacrificing the strength of the concrete itself by drilling, drilling or the like.

  By collecting the mat for confirming the concrete modified waterproof construction after the construction and measuring the weight change before and after the construction, it is possible to know the usage amount of the concrete modified waterproofing material in the vicinity of the portion where the mat is attached.

  Since the mat for confirming a concrete modified waterproof construction according to claim 2 is made using a sheet mainly made of cotton having excellent water absorption, an aqueous solution or water suspension of a concrete modified waterproof material is used. High ability to absorb. The planned use amount of the concrete-modified waterproof material is not necessarily constant and varies depending on the construction object, but the present invention can be applied even when the planned use amount is large or small. In addition, since the drop of the aqueous solution or water suspension of the modified waterproofing material is avoided, it is possible to more accurately determine the amount used.

  The concrete-modified waterproof construction confirmation mat according to claim 3, wherein the pH indicator is phenolphthalein, and it is colorless to reddish purple by touching an aqueous solution or water suspension of a concrete-modified waterproof material exhibiting alkalinity. Since the color changes sharply, it is easier to determine whether or not construction has been performed.

  The concrete reforming waterproof construction confirmation tool according to claim 4 is a concrete synthetic waterproofing construction confirmation mat according to the present invention sealed in a soft synthetic resin bag. The weight change due to the absorption of water vapor is suppressed, and the amount of use of the concrete-modified waterproofing material can be quantified more accurately. Moreover, since contact with water vapor or acidic or basic gas contained in the air is avoided, unintentional discoloration or fading of the mat for confirming concrete improvement waterproofing construction can be prevented.

  Further, since a sealing zipper is provided in the vicinity of the opening of the soft synthetic resin bag, it can be easily opened and closed, and the concrete-modified waterproof construction confirmation mat can be easily taken out or sealed.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings, but the present invention is not limited thereto.

  FIG. 1 is a drawing showing an embodiment of the present invention, in which (a) is a perspective view showing a concrete modified waterproof construction confirmation mat, and (b) is a perspective view showing a concrete modified waterproof construction confirmation tool. .

  The concrete-modified waterproof construction confirmation mat 1 according to the present invention is formed by impregnating a substantially rectangular sheet having water absorption with a pH indicator that changes color with an alkali color.

  The sheet used for the mat 1 for confirming the concrete modified waterproof construction is made of polypropylene or cotton, which has excellent water absorption and alkali resistance and can absorb the aqueous solution or water suspension of the concrete modified waterproof material well. Although the sheet | seat to be used is used suitably, if it has water absorption, it will not specifically limit. Cotton that is a natural fiber and hardly causes environmental pollution due to the fiber piece even when it is used is particularly suitable. The quality of cotton is not particularly limited, but those having high water absorption capable of absorbing 20 g or more of water per gram are preferably used.

  Moreover, it is not always necessary to be made of one type of fiber material, and a plurality of types of fibers may be mixed and made, and fiber materials of different materials may have a layered structure. Commercially available oil absorbing sheets or water absorbing sheets can also be used.

  As shown in FIG. 1 (a), the concrete reforming waterproof construction confirmation mat 1 has a substantially rectangular shape, but may have any shape such as a circle, an ellipse, etc. in addition to a triangle, a pentagon and other polygons. Even if there is, there is a similar effect. However, it is most preferable to have a substantially rectangular shape that is easy to create and can provide the present invention at low cost. The present invention is preferably colorless or white without containing colored components such as dyes and pigments other than the pH indicator so that the discoloration of the pH indicator can be easily recognized, but does not affect the discoloration of the pH indicator, and the pH. It may be colored with other colored components as long as the discoloration of the indicator is visible. Moreover, the size, thickness, etc. of the present invention are not particularly limited.

  The type of the pH indicator used in the present invention is not particularly limited as long as it is alkaline and discolors as indicated by the aqueous solution or water suspension of the concrete-modified waterproof material to be used. Cresol red, thymol blue, phenolphthalein, thymolphthalein, alizarin yellow or alkali blue are preferably used. Phenolphthalein that changes from colorless to reddish purple is particularly preferred. A pH indicator solution having an acidic color may be used as the pH indicator. In this case, the solvent is not particularly limited, but ethanol, water, or water-containing ethanol that is a mixed solvent that hardly causes environmental pollution. Are preferably used.

  By impregnating the sheet with a pH indicator, the concrete-modified waterproof construction confirmation mat 1 of the present invention is obtained.

  Various methods such as a method of spraying or applying a pH indicator solution on a sheet, a method of immersing a sheet in a pH indicator solution, a method of creating a mat with fibers impregnated with a pH indicator, and the like. Is applicable, and the method is not particularly limited. Since it is only necessary to visually recognize the color change of the pH indicator, it is not always necessary that the pH indicator is uniformly impregnated in the entire concrete-modified waterproof construction confirmation mat 1, and it is sufficient that at least one surface is impregnated. The method of spraying a pH indicator solution is most preferable because the present invention can be easily prepared. When the ethanol solution or hydrous ethanol solution of pH indicator is sprayed and used, the solvent can be easily removed only by air drying, so that the present invention can be created more easily.

  As shown in FIG. 1 (b), the concrete modified waterproof construction confirmation tool 2 according to the present invention has a concrete modified waterproof construction confirmation mat 1 having a sealing zipper 4 in the vicinity of the opening. It is sealed in the provided soft synthetic resin bag 3.

  The material of the soft synthetic resin bag 3 is not particularly limited as long as it is a synthetic resin having flexibility, and synthetic resins such as polyethylene, polypropylene, polyamide, and polyvinyl chloride are preferably used. Polyethylene, polypropylene or polyvinyl chloride, which has alkali resistance and is available at low cost, is particularly suitable.

  The appearance is not particularly limited, and various appearances such as a colorless and transparent material, a black light-shielding material, and a surface-treated translucent material can be used. A colorless and transparent material that can easily visually recognize the presence or absence of discoloration of the pH indicator impregnated in the enclosed concrete reforming waterproof construction confirmation mat from the outside of the soft synthetic resin bag 3 is most preferable.

  Further, the size and shape of the soft synthetic resin bag 3 are not particularly limited. It is also possible to use a commercially available synthetic resin bag with a zipper as the soft rigid resin bag 3.

  The inner surface of the flexible synthetic resin bag 3 in the vicinity of the opening is provided with zippers 4,..., And the flexible synthetic resin bag 3 is sealed by fitting the zippers 4,. .

  In FIG. 1 (b), two pairs of zippers are provided, but the number is not necessarily limited, and may be a pair or three or more pairs. It is preferable that two or more pairs of zippers 4,... Are provided so that the flexible synthetic resin bag 3 is more securely sealed. By being securely sealed, a change in weight during storage of the concrete-modified waterproof construction confirmation mat 1 due to volatilization of moisture or absorption of water vapor in the air is avoided, and the concrete-modified waterproof construction confirmation mat 1 is also protected. This is because the pH indicator contained is prevented from being discolored by contact with acidic or basic gas contained in the outside air. On the other hand, when three or more pairs of zippers are provided, the opening and closing of the soft synthetic resin bag 3 becomes complicated. Therefore, it is most preferable that two pairs of zippers 4 and 4 are provided.

  Hereinafter, although an Example and a usage example are shown, this invention is not limited to this.

  A cotton sheet having a water absorption of about 24 g per gram (manufactured by Kakui Co., Ltd .; CWO-5575) and a phenolphthalein 1 w / v% ethanol solution (manufactured by Sigma Aldrich Japan Co., Ltd.) Sprayed lightly wet. It was air-dried until reaching a constant weight, and the solvent was removed by evaporation. The material was cut into a square shape of 25 cm square to obtain a mat 1 for confirming concrete improvement waterproofing construction.

  A concrete modified waterproof construction confirmation mat 1 was inserted into a commercially available synthetic resin bag with a zipper to obtain a concrete modified waterproof construction confirmation tool 2.

Example of use

  FIG. 2 is a perspective view showing an example of use of the present invention.

  The weight before use of the concrete modified waterproof construction confirmation tool 2 described in the above example was measured, and the weight was recorded on the surface of the concrete modified waterproof construction confirmation tool 2.

The mat 1 for confirming the concrete modified waterproofing construction was attached to the look-up surface on which the concrete modified waterproofing construction was performed using a lath attachment tool 5,. The surface to which the present invention is applied is not necessarily limited to the look-up surface, and may be a vertical surface or a look-down surface. As a temporary guide, the concrete-reformed waterproofing construction confirmation mat 1 is stuck at about 5 locations per 100 m ² . The means for attaching is not particularly limited, but may be fastened using a fastening material such as a lath attachment, nail, staple, tape or the like, and may simply be placed on the look-down surface. When a fastening material is used, it is most preferable to use a lath attachment that can easily attach and remove the present invention without damaging the construction surface.

  After attaching the mat 1 for confirming the concrete modification waterproofing construction, an aqueous solution of a concrete modification waterproofing material (manufactured by Environmental Health Co., Ltd.) was sprayed using the spray gun 6 and construction was performed. Only the portion sprayed with the aqueous solution of the concrete-modified waterproof material was confirmed to change the color of the concrete-modified waterproof construction confirmation mat 1 to magenta, and it was easily visible where the construction of the construction surface was finished.

  When construction at each position on the construction surface was completed, the concrete-modified waterproof construction confirmation mat 1 attached at that position was sequentially removed from the construction surface, inserted into the soft synthetic resin bag 3 and hermetically stored. The position of the concrete modified waterproof construction confirmation mat 1 and the weight of the concrete modified waterproof construction confirmation tool 2 before construction were recorded on the surface of the soft synthetic resin bag 3.

  An aqueous solution of concrete-modified waterproofing material was sprayed on the construction surface where the concrete-modified waterproofing construction confirmation mat 1 was stuck so that there was no construction leakage.

  The weight after construction of the concrete modified waterproof construction confirmation tool 2 was measured, and the difference from the weight before construction was determined. This difference is the weight difference before and after the construction of the concrete modified waterproof construction confirmation mat 1 and the spray amount of the aqueous solution of the concrete modified waterproof material at the position where the concrete modified waterproof construction confirmation mat 1 is attached. . The results are shown in Table 1.

  In this use example, the design amount (lower limit of the expected spray amount) was 15.6 g per area of one mat, but spraying was performed in excess of the design amount at all five locations A to E. I was able to confirm. The average spray amount at 5 locations A to E was 24.0 g, and the standard deviation was 2.1 g. Statistically, it was found that the spray amount sufficiently exceeded the design amount over the entire construction surface. It was.

  The weight of the concrete reforming waterproofing construction confirmation tool 2 is the same as before or after spraying the concrete reforming waterproofing material as long as the zipper 4 is fitted and the soft synthetic resin bag 3 is sealed. Also remained unchanged for at least 3 weeks.

  As shown in this use example, the concrete modification at each position in the construction surface is determined from the weight change before and after construction of the concrete modified waterproof construction confirmation mat 1 or the concrete modified waterproof construction confirmation tool 2 and the construction position information. The amount of quality waterproofing material is known. As a result, it is possible to take measures such as performing construction again at a position where the usage amount is insufficient.

  In addition, the usage method described in this use example is not limited to a specific concrete-modified waterproof material, but can also be applied to various concrete-modified waterproof materials containing a silicate compound as a main component.

BRIEF DESCRIPTION OF THE DRAWINGS It is drawing which shows the Example of this invention, (a) is a perspective view which shows the mat for concrete reforming waterproof construction confirmation, (b) is a perspective view which shows a concrete reforming waterproof construction confirmation tool. It is a perspective view which shows the usage example of this invention.

Explanation of symbols

1 Modified waterproof construction confirmation mat 2 Modified waterproof construction confirmation tool 3 Soft synthetic resin bag 4 Zipper 5 Lath attachment 6 Spray gun

Claims (4)

  A concrete-modified waterproof construction confirmation mat, characterized in that a substantially rectangular sheet having water absorption is impregnated with a pH indicator that changes color with an alkali in a colored state.   The concrete-modified waterproof construction confirmation mat according to claim 1, wherein the sheet is a sheet mainly made of cotton.   The mat for waterproofing a concrete modified waterproof construction according to claim 1 or 2, wherein the pH indicator is phenolphthalein.   The concrete reforming waterproofing construction confirmation mat according to any one of claims 1 to 3, wherein the concrete reforming waterproofing construction confirmation mat is sealed in a soft synthetic resin bag having a sealing zipper in the vicinity of the opening. Concrete modification waterproof construction confirmation tool.

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