JP5015667B2 - Finished inspection method for concrete modified waterproof construction - Google Patents

Description

  The present invention relates to a method for inspecting the finished shape of a concrete waterproofing material containing a silicate compound as a main component.

  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. When construction with a modified waterproofing material (hereinafter referred to as concrete modified waterproofing construction) is performed, the modified waterproofing material gradually infiltrates from the surface into the interior of the concrete structure. .

  The modified waterproofing material is generally colorless and odorless and can avoid changes in the appearance of the concrete due to the concrete modified waterproof construction, but it is difficult to determine whether or not the concrete modified waterproof construction has been performed. There was no appropriate way to inspect the finished product. Moreover, in order to know whether or not the amount of the modified waterproof material used in the construction is appropriate, there has been no method or tool for quantifying the amount of the modified waterproof material used.

  Although it is not a method for confirming the construction of a 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.

In Patent Document 3,
Drilling from the surface of the concrete structure to a predetermined depth;
A step of color-coding the part neutralized by attaching a transfer agent to the inner surface of the excavation hole by the excavation and the part not neutralized;
Inserting a probe capable of detecting the color-coded position into the borehole and measuring the depth of the neutralized portion;
There is disclosed a method for measuring the neutralization depth of a concrete structure characterized by comprising:

  Patent Document 4 discloses that a pH indicator dye is characterized in that a pH indicator that indicates pH by color development is applied to concrete to measure the degree of neutralization of the concrete, and then the dye attached to the concrete is decolorized with a decoloring agent. A method for measuring the degree of neutralization of adhesive concrete is disclosed.

Japanese Patent No. 3204931 Japanese Patent Laid-Open No. 2002-40013 Japanese Patent Laying-Open No. 2005-233819 JP 2001-33438 A

  However, as described above, there is no method or tool for easily determining whether or not concrete-modified waterproof construction has been performed, or for quantifying the amount of modified waterproof material used. The method for determining the degree of neutralization of concrete described in 1 cannot be diverted.

  For example, 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 concrete modified waterproof construction has been performed, it is necessary to drill a number of locations on the construction surface, significantly reducing the strength of concrete, and repairing concrete after concrete modified waterproof construction. Takes time and effort. In addition to a reagent such as phenolphthalein, a container, a drill, and the like are necessary, and the measurement method itself is complicated, and cannot be applied to the looking-up surface and the looking-down surface.

  In addition, concrete improvement waterproofing construction is carried out to prevent neutralization, and the neutralization of the concrete before construction is not necessarily progressing, 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.

  Also by the neutralization depth measuring method described in Patent Document 3, the concrete structure must be perforated as in the method described in Patent Document 2. In order to apply to confirm whether or not concrete 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 repairing concrete after concrete modified waterproof construction. Takes time and effort.

  The method for measuring the degree of neutralization of pH indicating dye-attached concrete described in Patent Document 4 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 4, 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 easily and safely determine whether or not construction is performed with a modified waterproofing material. It is an object of the present invention to provide a method for inspecting the finished shape of a concrete-modified waterproof construction that can be applied to any surface including the above and can avoid sacrificing the strength of the concrete itself by excessive excavation.

In order to solve the above-mentioned problems, the method for inspecting the finished shape of concrete-modified waterproof construction according to the present invention has a substantially rectangular sheet having water absorption, and a pH indicator that changes color with alkali exhibits a color indicating acidity. A concrete modified waterproof construction confirmation mat that is impregnated in a state is pasted on the construction surface in advance, and a modified waterproofing material containing a silicate compound as a main component is sprayed or applied to the concrete modified waterproof construction, While performing qualitative evaluation by the presence or absence of discoloration of the pH indicator in the concrete modified waterproof construction confirmation mat ,
It is characterized in that the amount of the modified waterproof material used is quantified from the change in the weight of the mat for confirming the concrete modified waterproof construction before and after the concrete modified waterproof construction .

  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.

  According to the finish inspection method for concrete modified waterproof construction according to the present invention, the pH indicator contained in the concrete modified waterproof construction confirmation mat attached in advance to the construction surface contains a silicate compound as a main component. Since the discoloration is caused by the alkalinity of the quality waterproof material, it can be easily determined whether or not the construction in the vicinity of the part where the concrete reforming waterproof construction confirmation mat is attached is performed by visually confirming the presence or absence of the discoloration. It is possible to inspect whether or not construction has been performed for each part of the construction surface by attaching a plurality of concrete-modified waterproofing construction confirmation mats to the construction surface at appropriate intervals. In this case, if the same quality concrete modified waterproof construction confirmation mat is used, the degree of discoloration of the pH indicator varies depending on the amount of the modified waterproof material sprayed or applied to the concrete modified waterproof construction confirmation mat. It is possible to qualitatively compare the use amount of the modified waterproofing material between each part of the surface. During the construction work, it is possible to know the amount of the modified waterproofing material used in each part of the construction surface, so that uniform construction can be performed.

  The present invention does not use any special machinery, equipment, equipment, chemical substances, etc. other than the concrete-modified waterproof construction confirmation mat, and can easily and safely inspect the finished shape. Adverse effects on the person or the environment are avoided. It can be applied to any construction surface including the look-up surface and the look-down surface, without requiring any special operation other than sticking and removing the mat for confirming the concrete-modified waterproof construction to the work surface.

  Moreover, since excessive excavation is not required, there is no possibility of damaging the strength of the concrete, and it is not necessary to repair the excavation hole after inspection.

Furthermore , the use amount of the modified waterproof material for each part of the construction surface can be quantified from the weight change before and after the construction of the mat for confirming the concrete modified waterproof construction. It is possible to quantitatively evaluate whether or not uniform construction has been performed by measuring the amount of modified waterproofing material used on each part of the construction surface. It is possible to quantitatively evaluate whether or not a quality waterproof material is used.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto.

  First, main tools and the like according to the present invention will be described. FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a cross-sectional side view showing an embodiment of the present invention. Moreover, FIG. 3 is drawing concerning this invention, (a) is a perspective view which shows the mat for concrete modification waterproof construction confirmation, (b) is a perspective view which shows a concrete modification waterproof construction confirmation tool. FIG. 4 is a perspective view showing a plate member for a look-up surface according to the present invention, and FIG. 5 is a cross-sectional side view showing an example of use of the plate-like material for a look-up surface according to the present invention.

The pH indicator used in the present invention is not particularly limited as long as it is discolored by an alkali indicated by an aqueous solution or water suspension of a modified waterproofing material, but cresol red and thymol that are clearly discolored by the aqueous solution or water suspension. Blue, phenolphthalein, thymolphthalein, alizarin yellow or alkali blue are preferably used. Phenolphthalein that changes its color clearly from colorless to reddish purple is particularly preferred because it allows easier visual recognition.
These pH indicators may be dissolved after being obtained as a powder, or may be obtained as a prepared solution. In these cases, the solvent is not particularly limited, but ethanol, water, or water-containing ethanol that is a mixed solvent thereof that hardly causes environmental pollution is preferably used. A 1 w / v% ethanol solution of phenolphthalein or a 1 w / v% aqueous ethanol solution of phenolphthalein, which is available at a low cost and has a long track record of use in measuring the degree of neutralization of concrete, is most preferably used.

  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. 3 (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 be provided at low cost. Although the mat 1 for waterproofing construction for concrete modification waterproofing according to the present invention is desirably 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 visually confirmed, As long as the color change of the pH indicator is not affected and the color change of the pH indicator is visible, it may be colored with other colored components. Moreover, the size, thickness, etc. of the concrete modification waterproof construction confirmation mat 1 are not particularly limited.

By impregnating the sheet with a pH indicator, a concrete-modified waterproof construction confirmation mat 1 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. If the ethanol solution or aqueous ethanol solution of pH indicator is sprayed and used, the solvent can be easily removed only by air drying, so that the mat 1 for confirming waterproofing with concrete modification can be more easily produced.

  It is preferable that the concrete modified waterproof construction confirmation mat 1 is stored in a sealed state in the soft synthetic resin bag 3 except when in use. This is for avoiding unintentional discoloration or discoloration of the pH indicator contained by touching a change in weight due to volatilization of absorbed moisture, water vapor or acidic or basic gas contained in the air. A concrete modified waterproof construction confirmation mat 1 inserted into an individual soft synthetic resin bag 3 is referred to as a concrete modified waterproof construction confirmation tool.

  As shown in FIG. 3 (b), the concrete reforming waterproof construction confirmation tool 2 is a soft composite in which the mat 1 for concrete reforming waterproof construction confirmation has a zipper 4 for sealing in the vicinity of the opening. The resin bag 3 is hermetically sealed.

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. 3B, 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.

The plate-like material according to the present invention is not particularly limited as long as it is made of a material having rigidity that does not easily bend. Metal, synthetic resin, glass, and the like are used, and among them, a synthetic resin that is not easily damaged or deformed by physical contact and does not rust is preferable. The type of synthetic resin is not particularly limited, but polypropylene, polyethylene, polyethylene terephthalate, polymethacrylic acid ester, polycarbonate or polyvinyl chloride having resistance to water and alcohol are preferably used, and polypropylene, polyethylene, polyethylene having alkali resistance. Particularly preferred are terephthalate, polymethacrylates or polyvinyl chloride.
It is preferably a colorless and transparent plate-like material that can easily discriminate whether or not the pH indicator is colored and whether or not concrete crushed powder, pH indicator, and the like have been washed away.

  The modified waterproof material according to the present invention contains a silicate compound such as water glass or silicate as a main component, and the type is particularly limited as long as the aqueous solution or suspension exhibits alkalinity. is not.

  Next, an embodiment of the finished shape inspection method for concrete modified waterproof construction according to the present invention will be described, but various modifications can be made within a range that can be understood by those skilled in the art, and the quantity, length, concentration, capacity, Various conditions such as time or equipment used are not particularly limited.

  The concrete-modified waterproof construction confirmation tool 2 to be used is weighed in advance, and the weight is recorded on the surface of the soft synthetic resin bag 3. The operation of weighing the concrete modified waterproofing construction confirmation tool 2 can be replaced with the weighing of the concrete modified waterproofing construction confirmation mat 1. No, it is performed on the mat 1 for confirming the concrete modified waterproof construction.

The concrete reforming waterproof construction confirmation mat 1 is taken out from the soft synthetic resin bag 3 and attached to the construction surface as shown in FIGS. Since the finished shape of the construction is inspected by the concrete modified waterproof construction confirmation mat 1, a position and interval suitable for representing the construction surface are selected and pasted. As a temporary guide, it is advisable to apply a square-shaped concrete reforming waterproofing construction confirmation mat 1 of about 25 cm square to about 5 places per 100 m ² of the construction surface.

  The means for affixing the concrete modified waterproof construction confirmation mat 1 is not particularly limited as long as it is a method of affixing so that it substantially adheres to the construction surface. Fastening materials 5, such as lath fittings, nails, staples and tapes .. May be used, or simply placed on the look-down surface. As the fastening materials 5,..., A lath attachment is most preferable. This is because the lath fixture is usually joined by an adhesive such as an adhesive or a pressure-sensitive adhesive tape, thereby avoiding damage to the construction surface.

  Concrete modification waterproofing construction is performed by spraying or applying an aqueous solution or water suspension of the modified waterproofing material. When the modified waterproof material is sprayed or applied, the pH indicator contained in the concrete modified waterproof construction confirmation mat 1 attached to the construction surface changes color. During construction work, the construction completion part and the incomplete part can be discriminated, and the modified waterproofing material usage amount for each part can be compared from the degree of discoloration, so that uniform construction can be performed. By storing the mat for confirmation of waterproof construction for concrete modification, it is possible to confirm the completion of construction for each part and simple comparison of the construction amount even after completion of construction. Can do.

  When construction of each position on the construction surface is completed, the concrete-modified waterproof construction confirmation mat 1 attached at that position is sequentially removed from the construction surface, and the modified waterproof material is sprayed on the place where the mat is attached. Or apply to prevent leaks.

  The removed concrete modified waterproofing construction confirmation mat 1 is put in an individual soft synthetic resin bag 3 that has been put in before the construction, and is sealed and stored. The information on the place where the mat 1 is attached is recorded.

  Thereafter, the concrete-modified waterproof construction confirmation tool 2 is weighed and the weight is recorded. The difference in weight before and after the construction is equal to the weight of the aqueous solution or water suspension of the modified waterproof material absorbed by the concrete modified waterproof construction confirmation mat 1. The amount of the modified waterproof material used can be obtained. By comparing with the intended use amount, it is possible to know for each part whether sufficient modified waterproofing material has been used, and it is possible to know how much uniform construction has been performed. By these, it becomes possible to perform a quantitative inspection of the finished product.

  Furthermore, if a part of the construction surface is excavated and the impregnation of the modified waterproof material is directly confirmed, a more accurate finished shape inspection is possible. As described above, the modified waterproof material gradually infiltrates from the concrete surface. One week to several months after construction, a portion of the concrete is excavated, and the impregnation of the modified waterproofing material is confirmed using a pH indicator using the obtained concrete crushed powder and / or the inner wall of the excavation hole as a sample. . As a guide, drilling at a depth of about 1 mm to 2 mm after one week of construction. Since uniform construction is confirmed by the above qualitative inspection or quantitative inspection, it is possible to confirm the impregnation of the entire construction surface only by excavating a small number of places.

When concrete ground powder is used as a sample, when the construction surface is a vertical surface, a plate material having rigidity is disposed below the excavation site so as to be in contact with the construction surface, and concrete ground powder is received. The shape of the plate-like material is not particularly limited, but a substantially rectangular shape that is easily created and easy to use is suitable.
When the construction surface is a look-down surface, it is only necessary to excavate, and the ground concrete on the construction surface can be used as a sample.

When the construction surface is a look-up surface, the look-up surface plate member 8 shown in FIG. 4 can be used.
The plate member 8 for the look-up surface is one form of the plate member made of polymethacrylic acid methyl ester. As shown in FIG. 4, the temporary holes 10,. A plate-like material having rigidity. One excavation hole 9 is provided in the approximate center of the plate member 8 for the look-up surface, and one temporary hole 10 is provided in the vicinity of the four corners. Each of the excavation hole 9 and the temporary holes 10 is a through hole extending from the upper surface to the lower surface of the plate member 8 for the looking-up surface. In FIG. 4, the excavation holes 9 and the temporary holes 10,... Are both circular in cross section, but are not necessarily limited to this as long as they have a shape for excavation or temporary use. It may have a cross section of shape. The excavation hole 9 preferably has a circular cross section so that it can be easily excavated with a concrete drill or the like.

As shown in FIG. 5, the looking-up surface plate-like material 8 is temporarily arranged horizontally below the construction surface 14 by fastening materials 5, which are inserted through the temporary holes 10,. . The type of the fastening material is not limited as long as it can lock the plate member 8 for the look-up surface, but a lath attachment tool, a bolt, a nail, a staple or the like is preferably used. A lath fixture that is bonded by an adhesive such as an adhesive or an adhesive tape and can avoid damaging the construction surface is most preferred.
After temporarily mounting the plate member 8 for the look-up surface, the construction surface 14 is excavated by inserting at least a part of the excavator 11 into the hole 9 for digging, and the resulting concrete ground powder 12 is looked up on the plate-like material 8 for the look-up surface. To receive. After excavation at a predetermined depth, the plate member 8 for the looking-up surface is removed from the construction surface 14.

  The obtained concrete crushed powder is sprayed with a pH indicator, and the discoloration of the pH indicator is confirmed. When the construction surface is a vertical surface or a look-up surface, a pH indicator is sprayed on the plate-like material, and when the construction surface is a look-down surface, the pH indicator is sprayed. If the modified waterproofing material is sufficiently infiltrated, the pH indicator will change color and the whole concrete ground powder will appear to change color, so that the impregnation of the modified waterproofing material at the excavation site can be confirmed. It is possible to inspect the finished shape of the entire improved waterproof construction.

  On the other hand, it is also possible to directly confirm the impregnation of the modified waterproof material using the excavation hole inner wall 13 as a sample instead of the concrete pulverized powder 12. After excavating a part of the construction surface at a predetermined depth, a pH indicator is applied or sprayed on the resulting excavation hole. If the modified waterproof material is sufficiently infiltrated, the pH indicator changes color due to its alkalinity, and the entire borehole inner wall 13 appears to change color. Thereby, the impregnation of the modified waterproof material at the excavation site can be confirmed, and the finished form of the modified waterproof construction on the entire construction surface can be inspected.

  Hereinafter, although an example is described, the present invention is not limited to this.

(Making concrete reforming waterproofing confirmation mat)
A cotton sheet having a water absorption capacity of about 24 g per gram (manufactured by Kakui Co., Ltd .; CWO-5575), a phenolphthalein 1 w / v% ethanol solution (manufactured by Sigma Aldrich Japan Co., Ltd.), and the surface of the sheet being 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 waterproofing construction mat 1 was placed in a commercially available synthetic resin bag with a zipper and sealed to obtain a concrete modified waterproofing tool 2. The concrete-modified waterproofing tool 2 was weighed, and the weight was recorded on the surface of the bag and stored.

(Finished surface inspection using a mat for confirmation of concrete waterproofing construction)
A rectangular construction surface (area 408 m ² ) was divided into five sections, and concrete-modified waterproofing construction was performed for each section. The concrete modified waterproof construction confirmation mat 1 described in Example 1 was attached to a total of five locations near the four corners and near the center of each section using a lath wire mesh fitting.

  After attaching the mat 1 for confirming the concrete modified waterproof construction, the construction was carried out by spraying an aqueous solution of the modified waterproof material. In the portion where the aqueous solution of the modified waterproofing material was sprayed, the concrete modified waterproofing construction confirmation mat 1 was discolored, and it was possible to easily visually recognize which position on 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. Information on the position where the concrete-modified waterproof construction mat 1 was attached to the surface of the soft synthetic resin bag 3 was recorded.
An aqueous solution of the modified waterproofing material was sprayed on the construction surface where the concrete modified waterproof construction confirmation mat 1 was stuck so that there was no construction leakage.

  Table 1 shows the change in weight of each concrete-modified waterproof construction confirmation mat 1 before and after construction in one section. In this example, the designed amount, which is the expected spray amount, was 15.6 g per area of one mat, but it was confirmed that spraying of a predetermined amount or more was performed at all five locations A to E. did it. 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.

  It should be noted that the weight of the concrete modified waterproof construction confirmation mat 1 did not change for at least 3 weeks before or after spraying the modified waterproofing material as long as it was sealed in the soft synthetic resin bag. .

One week later, an arbitrary position on the construction surface on which the concrete reforming waterproofing construction was performed is determined as the excavation position, and as shown in FIG. 5, the excavation hole 9 is located immediately below the excavation position, A plate member 8 for the look-up surface was temporarily installed using the fastening materials 5 inserted through the holes 10. As the plate member 8 for the look-up surface, a 25 cm square shape having a thickness of 4 mm was used. As the fastening materials 5,..., A lath fixture was used, and the back surface of the lath fixture was attached to the construction surface using an adhesive.
After temporarily setting up the plate member 8 for the look-up surface, the construction surface 14 is excavated to a depth of about 2 mm with a concrete drill having a diameter of about 10.5 mm through the excavation hole 9 and the concrete crushed powder 12 generated thereby is looked up. It was received on the plate member 8 for face.

  The plate member 8 for the look-up surface was removed from the construction surface 14. After spraying the concrete ground powder 12 that has fallen around the excavation hole 9 on the face-up surface plate member 8 with water that is sufficient to wet the concrete ground powder, approximately the same amount of phenolphthalein 1 w / A v% ethanol solution was sprayed. The concrete pulverized powder 12 showed a strong reddish purple color uniformly. As a result, it was found that the modified waterproof material was impregnated to a depth of at least about 2 mm.

  On the other hand, the phenolphthalein 1 w / v% ethanol solution was sprayed to the excavation hole formed in the construction surface 14 by the above operation to such an extent that the inner wall 13 of the excavation hole was lightly moistened. The inner wall from the surface of the construction surface to the back of the excavation hole 13 having a depth of about 2 mm was uniformly colored purple. This indicated that the modified waterproof material was impregnated to a depth of at least about 2 mm. This result agrees with the result of the inspection using the above ground concrete powder as a sample.

  When the same operation was performed on the non-worked surface, no coloration was observed on any of the concrete crushed powder and the inner wall of the excavation hole, and the original color tone was maintained.

(Finish inspection of look-down surface using a mat for confirmation of waterproof construction of concrete reforming)
The concrete reforming waterproofing construction confirmation mat 1 described in Example 1 was placed in a total of five locations near the four corners and near the center of the rectangular look-down surface (area 102 m ² ) on which the concrete reforming waterproofing construction is performed.

  After placing the mat 1 for confirming the concrete modified waterproof construction, the construction was performed by spraying an aqueous solution of the modified waterproof material. In the portion where the aqueous solution of the modified waterproofing material was sprayed, the concrete modified waterproofing construction confirmation mat 1 was discolored, and it was possible to easily visually recognize which position on the construction surface was finished.

When construction at each position on the construction surface was finished, the concrete-modified waterproof construction confirmation mat 1 placed at that position was sequentially collected from the construction surface, inserted into the soft synthetic resin bag 3 and hermetically stored. Information on the position where the concrete modified waterproof construction confirmation mat was placed on the surface of the soft synthetic resin bag 3 was recorded.
An aqueous solution of the modified waterproof material was sprayed on the construction surface where the concrete modified waterproof construction confirmation mat 1 was placed so that there was no construction leakage.

  Table 2 shows the change in weight of each concrete-modified waterproofing construction confirmation mat before and after construction. In this example, the designed amount, which is the expected spray amount, was 15.6 g per area of one mat, but it was confirmed that spraying of a predetermined amount or more was performed at all five locations F to K. did it. The average spray amount at 5 locations from F to K is 30.8 g and the standard deviation is 6.5 g. Statistically, it was found that the amount of spray sufficiently exceeded the design amount over the entire construction surface. It was.

  It should be noted that the weight of the concrete modified waterproof construction confirmation mat 1 does not change for at least 3 weeks before or after spraying the modified waterproofing material as long as it is sealed in the soft synthetic resin bag 3. It was.

One week later, an arbitrary position on the construction surface where the concrete reforming waterproofing construction was performed was excavated to a depth of about 5 mm with a concrete drill having a diameter of about 10.5 mm.
On the construction surface, the concrete crushed and the excavation hole produced were sprayed with water so that the whole was lightly moistened, and then a phenolphthalein 1 w / v% ethanol solution was sprayed in substantially the same amount as water. It was found that both the ground concrete and the drilling holes showed a uniform strong red-purple color, which impregnated the modified waterproofing material to a depth of at least about 2 mm.

  When the same operation was performed on the non-worked surface, no coloration was observed on any of the concrete crushed powder and the inner wall of the excavation hole, and the original color tone was maintained.

It is a perspective view which shows the embodiment of this invention. It is side view sectional drawing which shows the embodiment of this invention. In the drawings according to the present invention, (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. It is a perspective view which shows the plate-shaped material for look-up surfaces which concerns on this invention. It is side view sectional drawing which shows the usage example of the plate-shaped material for look-up surfaces which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Modified waterproof construction confirmation mat 2 Modified waterproof construction confirmation tool 3 Soft plastic bag 4 Zipper 5 Fastening material 6 Spray gun 7 Adhesive 8 Look-up surface plate 9 Drilling hole 10 Temporary hole 11 Drilling Machine 12 Concrete ground powder 13 Drilling hole inner wall 14 Construction surface

Claims (1)

A concrete modified waterproof construction confirmation mat, which is impregnated with a pH indicator that changes color with alkali in a substantially rectangular sheet having water absorption, is attached to the construction surface in advance. After spraying or applying a modified waterproofing material containing an acid compound as a main component and applying concrete modified waterproofing, qualitative evaluation is performed by the presence or absence of discoloration of the pH indicator in the concrete modified waterproofing construction confirmation mat ,
A method for inspecting the finished shape of a concrete modified waterproof construction, characterized by quantifying the amount of the modified waterproof material used from the weight change of the mat for confirmation of the concrete modified waterproof construction before and after the concrete modified waterproof construction .

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