KR20080094657A - Seal for visual check of application of permeable inorganic concrete modifier, and method for visual check of permeable inorganic concrete modifier - Google Patents

Abstract

[PROBLEMS] To provide a novel means for visually checking the application of a proper amount of a concrete modifier on the surface of a concrete structure readily, reliably, and objectively. [MEANS FOR SOLVING PROBLEMS] A seal (1) for visually checking the application of a concrete modifier comprises a reactive layer (2) containing an acid and an indicator on the front side, an adhesive layer (3) on the back side, and a blocking layer (4) between the reactive layer (2) and the adhesive layer (3). When the seal (1) is placed on the surface of a concrete structure (6) in a dotted state and a concrete modifier is sprayed onto the seal (1), the acid contained in the reactive layer (2) causes a neutralizing reaction with an alkali contained in the concrete modifier, and the indicator contained in the reactive layer (2) then causes a color-developing reaction. In this manner, it can be confirmed that a proper amount of a concrete modifier is applied. The blocking layer (4) can prevent an alkali component leached out from the concrete structure (6) from reaching the back side of the reactive layer (2) to discolor the reactive layer (2).

Description

SEAL FOR VISUAL CHECK OF APPLICATION OF PERMEABLE INORGANIC CONCRETE MODIFIER, AND METHOD FOR VISUAL CHECK OF PERMEABLE INORGANIC CONCRETE MODIFIER}

The present invention relates to a technology for reforming concrete, and more specifically, a concrete material using a seal material and a seal material for detecting and confirming that a concrete modifier (including a concrete protection material is included. A method of detecting the construction of ash.

By spraying or spraying on the surface of concrete structure, it penetrates deeply into concrete, reacts with calcium hydroxide, calcium carbonate, calcium hydrogen carbonate, etc. to form inorganic crystals and densify continuous pores in concrete, which is harmful to acid rain, salt, carbon dioxide, etc. In order to prevent the intrusion of materials and to suppress the deterioration of concrete to extend the service life of concrete, a concrete reformer of the type has been recently conceived and the demand is expanding. Such concrete modifiers are disclosed in the following patent documents.

Patent Document 1: Japanese Patent No. 2937309

Patent Document 2: Japanese Patent Laid-Open No. 2004-131316

Patent Document 3: Japanese Patent Laid-Open No. 2004-323333

(Tasks to be solved by the invention)

However, it is difficult to visually confirm that this concrete modifier is a colorless transparent liquid mainly composed of alkali silicate or the like. Therefore, it is currently being installed under the order of the client, but as demand increased, the establishment of quality certification and site management system became urgent.

Accordingly, an object of the present invention is to provide a novel method that can easily and reliably objectively confirm that an appropriate amount of concrete modifier is constructed on the surface of a concrete structure.

(Means to solve the task)

In order to solve this problem, the present invention according to claim 1 is a seal material for detecting that the concrete modifier is constructed on the surface of the concrete structure, the reaction layer and quantitatively discolored in response to the alkali contained in the concrete modifier, and the adhesive layer and And a barrier layer formed between the reaction layer and the adhesive layer to prevent the alkali component eluted from the concrete structure from reaching the back side of the reaction layer and discoloring the reaction layer when attached to the concrete structure by the adhesive layer. It is a seal for confirming the construction of the concrete reformer.

The present invention according to claim 2 is an alkali-containing reaction layer formed by drying the reactant layer after impregnating acid and indicator on the substrate and spraying the concrete structure in the seal for confirming construction of the concrete modifier according to claim 1. When the indicator penetrates the absorbent substrate and neutralizes the acid, the indicator shows a color reaction.

The present invention according to claim 3 is characterized in that the acid contained in the reaction layer in the seal for confirming construction of a concrete modifier according to claim 2 is an acidic substance which is a liquid or a solid at room temperature, and the indicator is a pH indicator which is discolored between pH 3 and pH 11. do.

The present invention according to claim 4 uses a seal for confirming construction of a concrete modifier according to any one of claims 1 to 3, and a suitable interval is provided on the surface of the concrete structure on which the concrete modifier is to be constructed, with the adhesive layer on the back side interposed therebetween. After attaching it in the pointed state, spray the concrete modifier on the surface of the concrete structure with the seal for confirming the construction of the concrete modifier, and after a certain time, observe the discoloration state of the reaction layer of the seal for confirming the construction of the concrete modifier. It is a method of confirming the construction of a concrete reformer, characterized in that the reforming material is confirmed that the construction.

The present invention according to claim 5 in the method for confirming the construction of the concrete modifier according to claim 4 by spraying the concrete modifier on the surface of the concrete structure, and then spreading the cover sheet on the surface of the seal for confirming the construction of the concrete modifier It is characterized by covering.

(Effects of the Invention)

According to the method for confirming the construction of the concrete modifier of the present invention and the method for confirming the construction of the concrete modifier using the seal, it is possible to easily and surely objectively confirm that the appropriate amount of the concrete modifier is sprayed and constructed on the surface of the concrete structure.

1 is a cross-sectional view showing a state in which a seal for confirming the construction of a concrete modifier according to an embodiment of the present invention is attached to a surface of a concrete structure.

Fig. 2 is a chart showing the color reaction situation of a test body using a phenolphthalein solution as an indicator.

3 is a chart showing the color reaction situation of the test body using a methyl orange solution as an indicator.

4 is a chart showing the color reaction situation of the test body using the BTB solution as an indicator.

Fig. 5 is a chart showing the color reaction situation of the test body using AZY solution as an indicator.

6 is an evaluation table for predicting acid and indicator suitably used in the reaction layer.

<Description of the code>

One… … Seal for confirming the construction of concrete modifiers,

2… … Reaction Layer,

3... … Adhesive Layer,

4… … Barrier Layer,

5... … Cover Sheet,

6... … Concrete structure

1 is a cross-sectional view showing a state in which a seal 1 for confirming construction of a concrete modifier according to an embodiment of the present invention is attached to a surface of a concrete structure 6.

The seal for confirming the construction of the concrete modifier 1 is a laminate having a reaction layer 2 on the front side, an adhesive layer 3 on the back side, and a barrier layer 4 therebetween, for example, about 2 to 3 cm. It is formed in a circular shape having a diameter of.

The reaction layer 2 is formed by dropping an acid and an indicator onto a substrate and drying the same, and impregnating them uniformly throughout the substrate. As the water absorbing substrate, for example, filter paper, woven fabrics, knits, nonwoven fabrics, and sponges can be used. The present invention is applied to the principle of neutralization titration when the specified amount of concrete modifier is sprayed, the alkali (strong alkali, silica, etc.) and the equivalent of acid contained in the reaction layer (2) when the neutralization reaction The rapid change in the pH value of is detected by the color reaction of the indicator.

Various acids (mines, organic acids) of liquids and solids can be used for the acid, for example, ascorbic acid, formic acid, citric acid, succinic acid, salicylic acid, propionic acid, malic acid, valeric acid, tartaric acid, acetic acid, lactic acid, butyric acid, oxalic acid, Inorganic acids such as pyrophosphoric acid, hydrofluoric acid, boric acid, boric acid, polyphosphoric acid, iodic acid, phosphoric acid, phosphorous acid, sulfurous acid, hydrochloric acid, chloric acid, periodic acid, perbromic acid, bromic acid, nitric acid, sulfuric acid, or any mixture thereof. Since hydrochloric acid is volatilized in a short time, it is not preferable for the use of the present invention, and it is considered that phosphoric acid, citric acid and boric acid may be suitably used from the experimental results described below.

Indicators include p-nitrophenol, alizarin yellow R (AZY), cresol red, chlorophenol red, congo red, thymolphthalein, thymol blue, tetrabromophenol blue, tropeoline OOO, neutral red, phenolphthalein, phenol Red, bromcresol green, bromcresol purple, bromine thiblue (BTB), bromine phenol blue, bromine phenol red, methyl yellow, methyl orange, methyl red or mixtures thereof, and the like can be used, in particular phenolphthalein This is considered suitable.

Since the adhesive layer 3 is for attaching this concrete reformer construction confirmation seal 1 to the surface of the concrete structure 6 on which the concrete reformer is to be constructed, it is required to exhibit sufficient adhesion to the rough surface of the concrete structure 6. In addition to exhibiting sufficient adhesion to the barrier layer (4) laminated on the surface side, the surface temperature of the concrete structure (6) can reach 50 ~ 60 ℃ in summer, can maintain the adhesion even under such temperature conditions It is required to have heat resistance, to endure repeated wetting, and not to lose adhesiveness even if there is a certain amount of moisture.

The blocking layer 4 discolors the reaction layer 2 as the alkali component eluted from the concrete structure 6 reaches between the reaction layer 2 and the adhesive layer 3 and reaches the back side of the reaction layer 2. It prevents it from being made. The material of the blocking layer 4 should be sufficiently close to the adhesive layer 3 as described above, and should be durable not to be immersed in the acid contained in the reaction layer 2, the temperature conditions as described above. In addition, it is required to be hardly deformed, and from these viewpoints, plastics such as polyethylene, polypropylene, polystyrene, and the like are suitable as constituent materials of the barrier layer 4.

In addition, although not shown, since a large amount of water is used for the construction of the concrete modifier, a water absorbing layer is formed on the front side and / or the rear side of the reaction layer 2 in order to exclude the influence of the water, thereby improving the concrete of the present invention. The seal 1 for reconstruction confirmation can also be comprised.

The seal 1 for confirming the construction of the concrete modifier constructed in this way is used by attaching it in a dotted state at a predetermined interval on the surface of the concrete structure 6 on which the concrete modifier is to be constructed. Thereafter, as a work for protecting and reforming the concrete (high life to high durability), the concrete reformer is sprayed onto the surface of the concrete structure 6 to which the seal for confirming the construction of the concrete reformer 1 is dotted. . Spraying of the concrete modifier is carried out in accordance with the construction instructions provided by the manufacturer sales representative of the concrete modifier. Since the concrete modifier sprayed with the prescribed amount contains a predetermined amount of alkali, the reaction is neutralized with the equivalent acid in the reaction layer 2 of the seal 1 for confirming the construction of the concrete modifier. Since the indicator contained in the reaction layer 2 exhibits a color reaction, it can be easily and surely confirmed with the naked eye that the prescribed amount of concrete modifier is constructed.

After spraying the concrete modifier on the surface of the concrete structure (6) in which the seal for confirming the construction of the concrete modifier (1) is applied in a dotted state, quickly apply a cover sheet (5) to the surface of the seal for confirming the construction of the concrete modifier (1). It is preferable to cover the reaction layer 2 by spreading. Thereby, the preservability of the discolored seal can be improved. In addition, the alkali component eluted from the concrete structure 6 is prevented from discoloring the reaction layer 2 by reaching the surface side of the reaction layer 2 on the surface of the concrete structure 6. The cover sheet 5 may be formed of, for example, stainless steel, plastic film, thick paper, or the like.

<Test Example>

As described above, the present invention is applied by alkali (heavy alkali, silica, etc.) and equivalent acids contained in a prescribed amount of concrete modifier sprayed by applying the principle of neutralization titration, and a sudden change in pH when they are neutralized. Since the indicator which shows a color reaction is contained in the reaction layer 2, the test to confirm that it is suitable as an acid and indicator to be included in the reaction layer 2 was done.

Cut a commercially available relatively thin quantitative filter paper (ADVANTEC® 5A) with a diameter of 110 mm into 1/4 (approximately 24.2 cm ² ), and then add an appropriate amount to the whole of the cut filter paper to dry it indoors. (Approximately 20 ° C.), and 0.6 ml of acid of the reagent was further added dropwise to the whole of the cut filter paper with a measuring pipette to dry the room (about 20 ° C.). 1 cm ² The amount of sugar is about 0.012 meq. The edge part of this cut filter paper was cut about 2 mm, and the test piece of 2 cm x 2 cm was created. Twenty-four test specimens were prepared by using four solutions of phenolphthalein, methyl orange, BTB, and alizarin yellow as indicators, and six of hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, acetic acid, and citric acid. These test bodies correspond to the reaction layer 2 of the seal 1 for confirming the construction of the concrete modifier of the present invention.

Commercially available products of lithium silicate and sodium silicate were used as concrete modifiers, and 33% dilution, 10% dilution and 1% dilution were prepared by diluting the stock solution of the commercial product with 3 times, 10 times and 100 times water. Their pH values were measured to be 11.41, 11.31 and 10.68, respectively. In addition, according to the instruction manual of the commercially available product as a 33% diluent, it is necessary to spray with a spraying amount of 0.05L / m ² (= 0.005ml / cm ² ) per one time, the alkali amount per spray is about 0.012meq / cm ² .

Each test piece was placed on a paper towel and sprayed with each dilution sample of the concrete modifier downward from 5 cm above it. The spray amount of the diluent sample was about 0.15 g ≒ 0.15 ml and the spray amount per cm ² was about 0.012 ml because it was sprayed on a circular area of 4 cm diameter including the test body. Therefore, since the amount of acid present in the test sample cm ² by one spray was 0.004 meq, the experiment was performed by three spray times based on the concentration of 33.3%.

In addition, in 33% dilution, the quantity of alkali by one spray is 1 cm ² of cut filter paper of a test body. Per 0.004meq. Since the amount of acid pre-soaked in the test sample is about 0.012 meq per 1 cm ² of test sample, the acid of the test sample is neutralized by spraying three dilutions based on 33% dilution. As described above, the experiment was conducted with three spray times.

As shown in the test results shown in FIGS. 2 to 6, when the 33.3% dilution sample was infinite, a clear color reaction was observed, and there was a big difference in the color reaction even when compared to the 10% dilution sample and the 1% dilution sample. Confirmed.

However, depending on the acid or indicator, the test sample which is degraded due to deterioration of the filter paper and the indicator which is deteriorated due to deterioration of the filter paper is also noticeable, so that residual conditions of acid after drying, deterioration of the filter paper, deterioration of the indicator by acid, Each item of clarity of the color reaction of the indicator was evaluated for each acid and indicator. These results are shown in FIG. 7, and the acids considered to be particularly suitable are phosphoric acid, citric acid, hydrochloric acid, and boric acid. Since hydrochloric acid has the property of easy evaporation, it is considered to be unsuitable for the use of the present invention. In addition, the indicator which is considered to be particularly suitable is AZY and phenolphthalein. Methyl orange also has a small stain and a relatively stable color reaction. Therefore, it may be appropriately used depending on the type of acid to be combined.

Claims (5)

As a sealing material for detecting that the concrete modifier is installed on the surface of the concrete structure, The reaction layer and the adhesive layer which discolor by reacting quantitatively to the alkali contained in the concrete modifier and the alkali component eluted from the concrete structure when attached to the concrete structure by the adhesive layer reach the back side of the reaction layer, Seal for confirming the construction of the concrete modifier, characterized in that it has a barrier layer formed between the reaction layer and the adhesive layer to prevent discoloration. The indicator is color-reacted when the reaction layer is formed by impregnating an acid and an indicator on a substrate and then drying, and an alkali contained in a modifier sprayed onto the concrete structure penetrates into the water absorbent substrate of the reaction layer and neutralizes the acid. Seal for confirming the construction of the concrete modifier, characterized in that by confirming that the appropriate amount of concrete modifier has been constructed. The seal for confirming construction of a concrete modifier according to claim 2, wherein the acid contained in the reaction layer is an acidic substance which is a liquid or a solid at room temperature and the indicator is a pH indicator discolored between pH 3 and pH 11. Using the seal for confirming the construction of the concrete modifier according to any one of claims 1 to 3, the space is placed on the surface of the concrete structure on which the concrete modifier is to be applied, with the adhesive layer on the back side interposed therebetween. After applying, spray the concrete modifier on the surface of the concrete structure to which the seal for confirming the construction of the concrete modifier is applied, and after a predetermined time, observe the discoloration state of the reaction layer of the seal for confirming the construction of the concrete modifier. Confirming the construction method of the concrete modifier, characterized in that the confirmation. The method according to claim 4, wherein the concrete reformer is sprayed onto the surface of the concrete structure, and then the reaction layer is covered by spreading a cover sheet on the surface of the seal for confirming the construction of the concrete reformer.

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