WO2007077761A1

WO2007077761A1 - Seal for visual check of application of permeable inorganic concrete modifier, and method for visual check of permeable inorganic concrete modifier

Info

Publication number: WO2007077761A1
Application number: PCT/JP2006/325610
Authority: WO
Inventors: Yoshihisa Suzuki; Fumihiko Ogawa
Original assignee: Dvitec Co.Ltd.
Priority date: 2005-12-27
Filing date: 2006-12-22
Publication date: 2007-07-12
Also published as: JP4250745B2; KR20080094657A; CN101356434A; JP2007178210A

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

Specification

Seal for confirming construction of permeable inorganic concrete modifier and method for confirming construction of permeable inorganic concrete modifier using the seal

Technical field

[0001] The present invention relates to a concrete reforming technique, and more specifically, detects that a concrete reforming material (including a concrete protective material, the same applies hereinafter) is applied to a concrete structure. 'It relates to a sealing material for confirmation and a method for detecting construction of a concrete modifier using the sealing material.

Background art

[0002] By applying or spraying on the surface of concrete structures, it penetrates deeply into the concrete and reacts with concrete components such as calcium hydroxide, calcium carbonate, calcium bicarbonate to form inorganic crystals. In recent years, concrete modifiers have been focused on by densifying continuous pores in concrete to prevent acid rain and salinity from entering harmful substances such as carbon dioxide, suppressing concrete deterioration, and extending the durability of concrete. As a result, demand is expanding. Such concrete modifiers are disclosed in the following patent documents. Patent Document 1: Japanese Patent No. 2937309

Patent Document 2: JP 2004-131316 A

Patent Document 2: JP 2004-323333 A

Disclosure of the invention

Problems to be solved by the invention

However, since such a concrete modifier is a colorless and transparent liquid mainly composed of alkali silicate or the like, it is difficult to visually confirm that this has been applied.

. For this reason, construction is undertaken in the presence of the orderer as the demand for power increases.

The construction of quality certification and on-site management system is an urgent task.

[0004] Therefore, the object of the present invention is to provide a novel method capable of easily, surely and objectively confirming that an appropriate amount of concrete modifier has been applied to the surface of a concrete structure. There is to do. Means for solving the problem

[0005] In order to solve a significant problem, the present invention according to claim 1 is a sealing material for detecting that a concrete modifier has been applied to the surface of a concrete structure. Reaction layer that changes color by reacting quantitatively with alkali contained in the material, adhesive layer, and the strength of the concrete structure when the adhesive layer is attached to the concrete structure. And a barrier layer provided between the reaction layer and the adhesive layer in order to prevent the reaction layer from being discolored by reaching the reaction layer. It is.

[0006] The present invention according to claim 2 is the concrete modification seal according to claim 1, wherein the reaction layer is formed by impregnating the base material with an acid and an indicator and then drying, and the concrete layer. When the alkali contained in the modifier sprayed on the REIT structure penetrates into the water-absorbing substrate of the reaction layer and neutralizes with the acid, the indicator shows a color reaction, so that an appropriate amount of concrete is improved. It is characterized by confirming that the material has been constructed.

[0007] The present invention according to claim 3 is the concrete modification material construction confirmation seal according to claim 2, wherein the acid contained in the reaction layer is a liquid or solid acidic substance at room temperature, and the indicator is 113. It is characterized by 11 indicators that change between 1111.

[0008] The present invention according to claim 4 uses the concrete modifier application confirmation seal according to any one of claims 1 to 3, and applies the concrete modifier via the adhesive layer on the back surface. After affixed to the surface of the concrete structure to be interspersed at appropriate intervals, the concrete modifier is sprayed on the surface of the concrete structure on which the concrete modifier construction confirmation seal has been affixed. The concrete reforming is characterized by confirming that an appropriate amount of the concrete modifier has been applied by visually observing the discoloration state of the reaction layer of the seal for confirming the concrete modifier construction after a predetermined time. This is a material construction confirmation method.

[0009] The present invention according to claim 5 is the concrete modifier construction confirmation method according to claim 4, wherein the concrete modifier is sprayed onto the surface of the concrete structure and then the concrete modifier construction confirmation seal. It is characterized by covering the reaction layer by sticking a cover sheet on the surface.

The invention's effect [0010] According to the concrete modification material construction confirmation seal of the present invention and the concrete modification material construction confirmation method using this seal, an appropriate amount of the concrete modification material is sprayed on the surface of the concrete structure. This can be confirmed visually, easily, reliably and objectively.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a cross-sectional view showing a state in which a concrete modifying material construction confirmation seal 1 according to an embodiment of the present invention is attached to the surface of a concrete structure 6.

[0012] This concrete reforming material construction confirmation seal 1 is a laminate having a reaction layer 2 on the front surface side, an adhesive layer 3 on the back surface side, and a blocking layer 4 therebetween. It is formed in a circular shape having a diameter of about 2 to 3 cm.

[0013] The reaction layer 2 is formed by dropping an acid and an indicator onto a substrate and drying them, and impregnating them uniformly over the entire substrate. As the water-absorbing base material, for example, filter paper, woven fabric, knit, non-woven fabric, and sponge can be used. The present invention applies the principle of neutralization titration, and the reaction layer 2 contains an alkali (strong alkali, silica, etc.) contained in the reaction layer 2 when a specific amount of concrete modifier is sprayed. In addition, a rapid change in pH value when these are neutralized is detected by the color reaction of the indicator.

[0014] As the acid, liquid and various acidic substances (mineral acid, organic acid) can be used. For example, ascorbic acid, formic acid, succinic acid, succinic acid, salicylic acid, propionic acid, malic acid, valeric acid , Organic acids such as tartaric acid, acetic acid, lactic acid, butyric acid, oxalic acid, pyrophosphoric acid, hydrofluoric acid, borofluoric acid, boric acid, polyphosphoric acid, iodic acid, phosphoric acid, phosphorous acid, sulfurous acid, hydrochloric acid, chloric acid, peroxy Force that can use inorganic acid such as oxalic acid, perbromic acid, bromic acid, nitric acid, sulfuric acid, or any mixture thereof Hydrochloric acid volatilizes in a short time, so it is not preferable for the use of the present invention. Moreover, it can be considered that phosphoric acid, citrate, and boric acid are particularly preferably used from the experimental results described later.

[0015] Indicators include p--trofenol, alizarin yellow R (AZY), talesole red, kuronoenore red, congo red, zimonolephthalein, zimoenolevenolay, tetrabromophenol blue, Tropeoline 000, Neutral Red, Fueno Lephthalein, Hueno Norre Red, Brom Crezo Monore Green, Brome Creso Mono Lepa Purnore, Bromo Chimo Ability to use Noreb Nore (BTB), Bromoenenorebnore, Bromoenenore Red, Metinoreero, Methyl Orange, Methyl Red, or a mixture thereof. Conceivable.

[0016] The adhesive layer 3 is used to affix the concrete modifying material construction confirmation seal 1 to the surface of the concrete structure 6 to which the concrete modifying material is to be applied. In addition to being required to exhibit sufficient adhesion to the ground surface, it must also exhibit sufficient adhesion to the barrier layer 4 laminated on the surface side, and the surface temperature of the concrete structure 6 In summer, it can reach 50 to 60 ° C, so it has heat resistance that can maintain adhesive strength even under such temperature conditions, and it has enough moisture to withstand repeated wetting. However, it is required that adhesiveness is not lost.

[0017] The blocking layer 4 is interposed between the reaction layer 2 and the adhesive layer 3, and the alkali component eluted from the concrete structure 6 reaches the back side of the reaction layer 2 to discolor the reaction layer 2. It plays a role in preventing the situation. The material of the barrier layer 4 can be sufficiently adhered to the adhesive layer 3 as described above, has durability that is not affected by the acid contained in the reaction layer 2, and can be deformed even under the above temperature conditions. From these viewpoints, for example, plastics such as polyethylene, polypropylene, and polystyrene are suitable as the constituent material of the barrier layer 4.

[0018] Although not shown, since a large amount of water is used for the construction of the concrete modifier, water is absorbed on the surface side and Z or the back side of the reaction layer 2 in order to eliminate the influence of this water. A layer 1 may be provided to constitute the concrete modification material construction confirmation seal 1 of the present invention.

[0019] The concrete reforming material construction confirmation seal 1 configured in this way is used by being attached to the surface of a concrete structure 6 on which a concrete reforming material is to be constructed in a scattered state at predetermined intervals. It is done. After that, as a work to improve and improve the concrete (longer life or higher durability), the concrete reforming material construction confirmation seal 1 is adhered to the surface of the concrete structure 6 in which the concrete modifier 6 is attached in a scattered state. Spray the modifier with a spray. Spray the concrete modifier according to the installation instructions provided by the manufacturer and seller of the concrete modifier. The concrete modifier that has been sprayed with the specified amount contains a certain amount of alkali, so the equivalent amount contained in the reaction layer 2 of the concrete modifier confirmation seal 1 Since the indicator contained in the reaction layer 2 shows a color reaction due to a rapid pH change at this time, it is visually confirmed that the specified amount of concrete modifier has been applied. It can be confirmed easily, reliably and objectively.

[0020] After the concrete modifier 6 is sprayed on the surface of the concrete structure 6 on which the concrete reforming material construction confirmation seal 1 is adhered in a scattered state, the concrete reforming material construction confirmation seal 1 It is preferable to cover the reaction layer 2 by sticking the cover sheet 5 on the surface. Thereby, the preservability of the discolored seal can be improved. Further, it is possible to prevent alkali components eluted from the concrete structure 6 from reaching the surface side of the reaction layer 2 through the surface of the concrete structure 6 and discoloring the reaction layer 2. The cover sheet 5 can be formed of, for example, stainless steel, a plastic film, or cardboard.

[0021] <Test example>

As described above, the present invention applies the principle of neutralization titration to the acid equivalent to the alkali (strong alkali, silica, etc.) contained in the sprayed specified amount of concrete modifier, and these. In order to confirm the suitable acid and indicator to be included in the reaction layer 2, an indicator that exhibits a color reaction due to the rapid pH change that occurs when the nitrile is neutralized is contained in the reaction layer 2. The test was conducted.

[0022] After cutting a commercially available thin quantitative filter paper (ADVANTEC (registered trademark, Toyo Filter Paper) 5 A) with a diameter of 110 mm into 1Z4 (about 24.2 cm ² ), an appropriate amount so that the indicator penetrates the entire cut filter paper. Then, the solution was dried indoors (about 20 ° C), and 0.6 ml of the reagent acid was dropped with a measuring pipette so as to soak into the entire cut filter paper and dried indoors (about 20 ° C). The acid amount per 1 cm ² is about 0.012 meq. An edge of this cut filter paper was cut by about 2 mm to prepare a 2 cm × 2 cm test piece. Four types of solutions are used as indicators: phenolphthalein, methyl orange, BTB, and alizarin yellow, and six types of acids are used: hydrochloric acid, sulfuric acid, phosphoric acid, boric acid, acetic acid, and citrate. By combining these, a total of 24 types of specimens were created. These specimens correspond to the reaction layer 2 in the concrete modification material construction confirmation seal 1 of the present invention.

[0023] As the concrete modifier, commercial products of lithium silicate and sodium silicate are used, and the stock solution of the commercial product is diluted with water 3 times, 10 times and 100 times, 33% diluted solution, 10% Dilution Solution and 1% dilution were prepared. When these pH values were measured, they were 11.41, 11.31 and 10.68, respectively. According to the instruction manual for the commercial product, it should be sprayed as a 33% diluted solution at a spray amount of 0.05 L / m ² (= 0.005 ml / cm ² ) per spray. alkali per dose is from about 0. 012meqZcm ^2.

[0024] Each test specimen was placed on a paper towel, and each diluted solution sample of the concrete modifier was sprayed downward by spraying 5 cm above it. The spray amount of the diluted liquid sample was about 0.15 g ^ O. 15 ml, and the spray amount per lcm 2 was about 0.012 ml because it was sprayed on a circular area of 4 cm in diameter including the test specimen. Therefore, the amount of acid that is supposed to be present in the test specimen cm ² by one spray is 0.004 meq. Therefore, the experiment was conducted with 3 sprays based on the concentration of 33.3%.

[0025] In the 33% diluted solution, the amount of alkali by one spray was 0.004 meq per lcm ² of cut filter paper of the test specimen. Since the amount of acid soaked into the test specimen is about 0.012 meq per lcm ² of the test specimen, based on the 33% dilution, the test specimen was sprayed with three dilutions. The acid will be neutralized. Based on the above, the experiment was carried out with 3 sprays.

[0026] As shown in the test results shown in Fig. 2 to Fig. 6, when a 3% diluted sample was sprayed, a clear color reaction was confirmed, and the 10% diluted sample and 1% diluted solution It was confirmed that there was a big difference in the color reaction compared with the sample.

[0027] Although there were some specimens in which the filter paper deteriorated easily due to the acid or indicator, and specimens in which the indicator deteriorated and discolored due to the acid or indicator, the residual state of the acid after drying was observed. Each item of acid and indicator was evaluated for the items of filter paper deterioration, indicator deterioration due to acid, and clarity of indicator color reaction. The results are shown in FIG. 7. The acids that are considered to be particularly suitable are phosphoric acid, citrate, hydrochloric acid, and boric acid, but hydrochloric acid has the property of easily evaporating, and is not suitable for the use of the present invention. It is believed that there is. In addition, AZY, phenolphthalein, which is considered to be particularly suitable, has a relatively stable color reaction with strong orange, which is phenolphthalein, and can be used suitably depending on the type of acid to be combined. It is thought to get.

Brief Description of Drawings FIG. 1 is a cross-sectional view showing a state in which a concrete modifier construction confirmation seal according to one embodiment of the present invention is attached to the surface of a concrete structure.

FIG. 2 is a chart showing the color reaction status of a test specimen using a phenolphthalein solution as an indicator.

FIG. 3 is a chart showing the color reaction status of a test specimen using a methyl orange solution as an indicator.

FIG. 4 is a chart showing the color reaction status of a test specimen using a BTB solution as an indicator.

FIG. 5 is a chart showing the color reaction status of test specimens using an AZY solution as an indicator.

FIG. 6 is an evaluation table for predicting acids and indicators that are preferably used in the reaction layer.

Explanation of symbols

[0029] 1 Seal for confirmation of concrete modifier construction

2 Reaction layer

3 Adhesive layer

4 Barrier layer

5 Cover sheet

6 Concrete structures

Claims

The scope of the claims

[1] A seal material for detecting that a concrete modifier has been applied to the surface of a concrete structure, a reaction that quantitatively reacts with the alkali contained in the concrete modifier and changes its color. Layer, adhesive layer, and the alkali component eluted from the concrete structure when it is attached to the concrete structure by the adhesive layer, prevents the reaction layer from discoloring by reaching the back side of the reaction layer Therefore, there is provided a barrier layer provided between the reaction layer and the adhesive layer, and a concrete modifier construction confirmation seal.

[2] The reaction layer is formed by impregnating the base material with an acid and an indicator and then drying, and the alkali contained in the modifier sprayed on the concrete structure penetrates into the water-absorbing base material of the reaction layer and is acidified. The concrete modifier confirmation according to claim 1, wherein when the indicator is neutralized, the indicator shows a color reaction to confirm that an appropriate amount of the concrete modifier has been applied. Seal for.

[3] The concrete modification according to claim 2, wherein the acid contained in the reaction layer is a liquid or solid acidic substance at room temperature, and is a pH indicator that changes color between indicator power ¾H3 and pH11. Seal for checking material construction.

[4] Use the concrete modification material construction confirmation seal according to any one of claims 1 to 3 through the adhesive layer on the back surface to the surface of the concrete structure where the concrete modification material is to be constructed. After being pasted at appropriate intervals, the concrete modifier is sprayed onto the surface of the concrete structure on which the concrete modifier construction confirmation seal has been affixed. Looking at the discolored state of the reaction layer of the seal for confirmation of material construction? A concrete modifier construction confirmation method characterized by confirming that an appropriate amount of concrete modifier has been constructed by observation.

[5] The method is characterized in that after the concrete modifier is sprayed on the surface of the concrete structure, the reaction layer is covered by sticking a cover sheet on the surface of the concrete modifier confirmation seal. The concrete modifier construction confirmation method described.