JP5923697B2 - Method and apparatus for inspecting concrete modifier - Google Patents

Description

  The present invention relates to an inspection method for a silicate-based concrete modifier, and in particular, a concrete modifier for inspecting that a silicate-based concrete modifier is applied to a concrete structure. The present invention relates to a pre-construction method, a construction method, and a construction inspection method and apparatus.

  In general, it is known that cracks and the like due to deterioration factors occur in a concrete structure after long-term use. As a method of preventing this deterioration factor or repairing cracks, a method of applying or spraying a concrete modifier generally called a silicate surface impregnating material to the surface of a concrete structure is known.

  The concrete modifier contains a silicate such as sodium silicate or lithium silicate as one of the main components, and is used as an aqueous solution formed by mixing with water.

  This concrete modifier has a function of suppressing deterioration factors of concrete with silica contained in the silicate compound, or densifying and improving concrete that has already deteriorated. Moreover, by the construction with the silicate compound, the silicate compound gradually diffuses from the surface into the concrete structure, and the reforming proceeds.

  On the other hand, since such a concrete modifier is a colorless and transparent liquid, it is difficult to visually confirm that the concrete modifier has been applied, but it has been visually confirmed that an appropriate amount of the concrete modifier has been applied. Is already known (see Patent Document 1).

  In Patent Document 1, when a mat coated with a pH indicator in advance is attached to a concrete surface and then a concrete modifier is applied, the alkali metal in the silicate is determined depending on whether or not the mat is discolored. A method for confirming that the concrete modifier is applied by confirming the alkalinity of (lithium, sodium, potassium) is disclosed.

  In addition, as a method of confirming that a silicate-based concrete modifier has been used after the concrete modifier has been applied, a pH indicator is directly applied to the concrete structure to which the concrete modifier has been applied. There has been considered a method in which after spraying or moistening the surface of a concrete structure with moisture, a sheet impregnated with a pH indicator is stuck and the alkalinity is confirmed by discoloration of the sheet.

Japanese Patent No. 4250745

  However, in the confirmation method after or after the concrete modifier described above, only the alkalinity in the silicate is confirmed, and the concrete is alkaline. It cannot be said that the reaction is caused by the components of the agent, and it is not necessarily certain whether it is a reliable confirmation method.

  On the other hand, the concrete modifier is considered to be densified by entering into the concrete and reacting and gelling with calcium contained in the concrete and silica contained in the silicates.

  Therefore, it is considered that silica is included as an example of an important criterion for checking that it is a silicate-based concrete modifier. In the conventional confirmation method described above, the presence or absence of silica is considered. Cannot be judged.

  Therefore, the present invention has been made by taking the above-mentioned problem as an example, and provides a method for inspecting a concrete modifier that inspects that a silicate-based concrete modifier having silica is used. For the purpose.

  In order to solve the above problems, the concrete modifier inspection method according to claim 1 is a concrete modifier for inspecting that a silicate-based concrete modifier is applied to the surface of a concrete structure. After the surface of the target concrete structure is cleaned, the surface of the concrete structure is moistened with moisture, and water on the surface of the concrete structure is impregnated in a sheet having water absorption Then, a solution A diluted by mixing a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II is dropped onto the sheet, and the presence or absence of construction is confirmed by the presence or absence of discoloration of the sheet.

  The method for inspecting a concrete modifier according to claim 2 is the method for inspecting a concrete modifier according to claim 1, wherein after the solution A is dropped onto the sheet, L (+) is applied to the sheet. -A powder of ascorbic acid or a solution in which L (+)-ascorbic acid is dissolved is added.

  The method for inspecting a concrete modifier according to claim 3 is the method for inspecting a concrete modifier according to claim 2, wherein the tartaric acid solution or oxalic acid is added before adding the L (+)-ascorbic acid. It is characterized by dripping.

  The method for inspecting a concrete modifier according to claim 4 is a method for inspecting a concrete modifier for inspecting that a silicate-based concrete modifier has been applied to the surface of a concrete structure. After cleaning the surface of the target concrete structure, moisten the surface of the concrete structure with moisture, impregnate the moisture-absorbing sheet with moisture on the surface of the concrete structure, A solution C in which an antimonyl potassium tartrate solution is mixed is added dropwise to a solution A obtained by diluting a solution obtained by mixing a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II, and the presence or absence of construction is confirmed by the presence or absence of discoloration of the sheet. And

  The method for inspecting a concrete modifier according to claim 5 is a method of collecting and diluting a concrete modifier to be applied to the surface of a concrete structure to be constructed, and adding an aqueous hydrochloric acid solution I and an aqueous ammonium molybdate solution. Whether or not it is a silicate-based concrete modifier depending on the presence or absence of discoloration of the mixed solution by dripping the diluted concrete modifier with respect to the solution A obtained by diluting the solution mixed with II. It is characterized by inspecting.

  A concrete modifier inspection device according to claim 6 is a concrete modifier inspection device that inspects that a silicate-based concrete modifier is applied to the surface of a concrete structure. After the surface of the concrete structure is moistened with moisture, the inspection apparatus is attached, and a water-absorbing lower sheet that is impregnated with the moisture is disposed above the lower sheet. An upper sheet in which an aqueous solution I and an aqueous solution of ammonium molybdate II are mixed and diluted to be fixed on the surface of the lower sheet; and the upper sheet and the lower sheet are disposed between the lower sheet and the upper sheet. And a blocking sheet that prevents moisture from penetrating, and the upper sheet, the lower sheet, and the blocking sheet are fixed at least on one end side, and the blocking sheet is removed. Characterized in that provided on the ability.

  The method for inspecting a concrete modifier according to claim 7 is a method for inspecting a concrete modifier for inspecting that a silicate-based concrete modifier is applied to the surface of a concrete structure. A sheet having water absorption on the surface of the concrete structure, and after the silicate-based concrete modifier is applied, the sheet is collected, and the hydrochloric acid aqueous solution I and the sheet are collected. A solution A diluted by mixing with an ammonium molybdate aqueous solution II is dropped, and the presence or absence of construction is confirmed by the presence or absence of discoloration of the sheet.

  It can be easily confirmed that the concrete modifier before construction, during construction, and after construction is a silicate-based concrete modifier.

It is a flowchart figure which shows an example of the inspection method of a concrete modifier. It is a figure for demonstrating an example of the inspection method of the concrete modifier after construction. It is a figure for demonstrating an example of the inspection method of the concrete modifier under construction. It is a figure for demonstrating an example of the inspection apparatus of a concrete modifier.

  Hereinafter, the best embodiment of the present application will be described with reference to the accompanying drawings.

  The present invention pays attention to the effect that silica contained in silicate reacts with calcium hydroxide in concrete, and in the silicate as in the conventional method for confirming construction of concrete modifier Rather than confirming the alkalinity of the alkali metal, it is considered important to determine the presence or absence of silica.

  In the present invention, in concrete in which a concrete modifier is applied, the surface of the concrete is moistened with moisture and allowed to stand for a predetermined time, and then the moisture of the surface of the concrete is sampled to obtain a component of the concrete modifier. By extracting and detecting silica in the component, it is inspected that a silicate-based concrete modifier is used.

  As described above, the present invention inspects whether or not a concrete modifier having a silicate has been constructed by detecting the presence or absence of silica, as shown in FIGS. In this embodiment, the surface 10a of the target concrete structure 10 is sprayed with distilled water 15 to wet the surface 10a with moisture (FIG. 2 (a)), and after a predetermined time has elapsed, the sheet has water absorption. 20 is adhered to the surface 10a of the concrete structure 10 to impregnate the sheet 20 with moisture on the surface 10a of the concrete structure 10 (FIG. 2 (b)), and then the sheet 20 is mounted on a chalet or the like. Since the reagent A is placed on the mounting table 30 and dropped onto the sheet 20 by using a dropper 25 or the like, the reagent A is discolored by silica (FIG. 2C). To confirm the presence or absence of construction by.

  This reagent A is a solution A obtained by mixing and diluting an aqueous hydrochloric acid solution I obtained by adding hydrochloric acid to distilled water and an aqueous ammonium molybdate solution II obtained by dissolving ammonium molybdate in distilled water.

  Reagent A reacts with silica and changes its color to yellow. However, since it is difficult to visually recognize, reagent A was dropped onto a sheet impregnated with moisture on the surface of the concrete structure on which the concrete modifier was applied. After 3 minutes, the reagent B is further added (dropped), and the color changes to blue, so that it is easy to visually recognize. The reagent B is L (+)-ascorbic acid powder or a solution in which L (+)-ascorbic acid is dissolved. In addition, when using reagent B as a solution, it is preferable to make it into a solution just before a test | inspection. This is because the quality is not stable when stored as a solution for a long time.

  More preferably, the reaction can be accelerated by using the reagent C instead of the reagent A. This reagent C is a solution C obtained by mixing reagent A and a solution of potassium antimonyl tartrate (also known as dipotassium bis [(+)-tartrate] niantimonate (III)).

  Here, the sheet used in the present embodiment preferably has a material having excellent water absorption. For example, a sheet mainly composed of polypropylene or cotton is preferably used, but is not particularly limited as long as it has water absorption.

  As described above, the standing time after the surface of the concrete structure is moistened with moisture, the time for impregnating the sheet with moisture on the surface of the concrete structure, and the time until the reagent B is added after the reagent A is dropped. However, in the present embodiment, the time shown in the embodiment is suitable, but the time is not limited to the time, and may be appropriately changed depending on various conditions.

  In the present embodiment, since the reagent is dropped after the sheet is impregnated with the modifier, the inspection apparatus 50 shown in FIG. 4 can be used because it becomes very complicated.

  As shown in FIG. 4, the inspection apparatus 50 is a sheet configured by stacking a plurality of sheets. The sheet is disposed between three sheets having water absorption (the lower sheet 52, the intermediate sheet 56, and the upper sheet 58) and the respective sheets 52, 56, and 58, and the sheets do not contact each other and have moisture. Are provided with two blocking sheets (a lower blocking sheet 54 and an upper blocking sheet 57). The lower sheet 52 is attached to both sides with adhesive bodies 53, 53 for adhering to a concrete structure.

  Further, the three sheets 52, 56, 58 and the blocking sheets 54, 57 are formed by being bonded together at one end side by welding or the like, and the respective sheets 54, 56, 57, 58 can be turned at the other end side. It is possible. Further, the cutoff sheets 54, 57 and the intermediate sheet 56 are provided with cut lines 54a, 56a, 57a formed by broken lines on one end side, and the cutoff sheets 54, 57 are formed by the cut lines 54a, 56a, 57a. And the intermediate sheet 56 can be cut and removed.

  In addition, the reagent A is fixed to the lower surface of the intermediate sheet 56. Specifically, after the reagent A is impregnated in the intermediate sheet 56, the reagent A is fixed by using a technique such as drying the intermediate sheet 56 or pasting the reagent A into a powder form. Is done. In order to accelerate the reaction as described above, the reagent C may be fixed to the intermediate sheet 56 instead of the reagent A.

  Furthermore, the reagent B is fixed to the lower surface of the upper sheet 58 by sticking the powdery reagent B thereon.

  The inspection device 50 configured as described above is used during the construction of the concrete modifier or for the inspection after the construction.

  Specifically, first, after cleaning the surface of the target concrete structure, sprayed with distilled water and moistened with moisture, and after a predetermined time (about 3 to 5 minutes), the inspection device 50 is It sticks on the surface of the said concrete structure using the sticking body 53, and it is left to stand for about 90 seconds, and the water | moisture content on the surface of the said concrete structure is made to impregnate the lower sheet 52. FIG.

  Next, the inspection apparatus 50 is placed on a flat base (for example, a petri dish).

  Next, the lower blocking sheet 54 is removed, the intermediate sheet 56 is brought into close contact with the lower sheet 52, and left for a predetermined time. Thereby, the reagent A fixed to the lower sheet 52 is dissolved.

  Next, the intermediate sheet 56 and the upper blocking sheet 57 are removed, and the upper sheet 58 is brought into close contact with the lower sheet 52. Thereby, the reagent B fixed to the upper sheet 58 is dissolved. And it is confirmed whether it changes into blue by reaction with the reagent B, A test | inspection process is complete | finished.

  In addition, when silica is contained in the concrete modifier, the color is changed to blue, and when silica is not contained, the color is not changed.

  According to this example, after applying the concrete modifier to the target concrete structure, whether or not the concrete modifier was applied with a silicate-based concrete modifier containing the original silica. It can be easily inspected.

  The upper blocking sheet 57 and the upper sheet 58 are appropriately provided as necessary, and are not indispensable constituent requirements.

-Example-
In the present invention, the silicate-based concrete modifier used to prevent cracking and deterioration of the concrete structure is colorless, and when the concrete modifier is applied to the concrete structure, was it actually applied? Because it is not possible to determine whether or not the construction company can determine before the construction whether the concrete modifier is a silicate-based concrete modifier having the original function, It is a method that can be inspected to be a silicate-based concrete modifier before construction, during construction, and after construction.

  Hereinafter, the inspection method before using the concrete modifier, the inspection method during construction of the concrete modifier, and the inspection method after construction of the concrete modifier will be described in detail.

-Pre-construction inspection method for silicate-based concrete modifier-
First, a small amount of concrete modifier is collected in a dish generally called a petri dish, and diluted 2-3 times with distilled water.

  Next, a solution obtained by diluting the concrete modifier in reagent A is collected with a dropper or the like and dropped, and left for about 3 minutes. Reagent A should not be dropped on the concrete modifier. The reason for this is that the concrete modifier exhibits alkalinity, and the reagent A reacts in an acidic region, so that the reagent A is dripped onto the concrete modifier to change from alkaline to acidic. Easy to gel in the process. On the other hand, by dropping the concrete modifier to the reagent A, it is possible to maintain an acidic state, and it is easy to react without gelation.

  In addition, the reaction can be accelerated by dropping the reagent C instead of the reagent A.

  Finally, add reagent B and confirm that it turns blue. In addition, when silica is not contained in the concrete modifier, there is no discoloration.

  According to this example, before applying the concrete modifier to the target concrete structure, whether or not the concrete modifier is a silicate-based concrete modifier containing the original silica. It can be easily inspected.

-Inspection method during construction of silicate-based concrete modifier-
First, in a concrete structure constructed by washing the surface of the target concrete structure and sticking a water-absorbing sheet and then spraying with a concrete modifier, the sheet is removed from the concrete structure. The reagent A is collected with a dropper or the like and dropped, and the reagent A is included in the sheet and left for about 3 minutes. In addition, the reaction can be accelerated by dropping the reagent C instead of the reagent A.

  The reagent A used in this example is a solution A obtained by mixing and diluting a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II. This hydrochloric acid aqueous solution I is a solution obtained by adding 167 ml of special grade hydrochloric acid to about 50 ml of distilled water, and cooling to 250 ml with distilled water. On the other hand, the ammonium molybdate aqueous solution II is a solution obtained by dissolving 55 g of special grade ammonium molybdate (58.4 g of special grade ammonium molybdate tetrahydrate) in about 200 ml of warm distilled water and cooling to room temperature. Reagent A is a solution obtained by adding ammonium molybdate aqueous solution II little by little to hydrochloric acid aqueous solution I and diluting a solution of 500 ml with distilled water 5 times or 10 times.

  Finally, the reagent B is dropped on the sheet and it is confirmed that the color changes to blue. This reagent B is a solution obtained by dissolving 6 g of a solution in which L (+)-ascorbic acid is dissolved with 30 ml of distilled water. The reagent B may be L (+)-ascorbic acid powder. In addition, when silica is not contained in the concrete modifier, there is no discoloration.

  According to this embodiment, it is possible to easily inspect whether or not the concrete modifier under construction on the target concrete structure was constructed with a silicate-based concrete modifier containing silica. It is.

-Inspection method for silicate-based concrete modifier already installed-
After cleaning the surface of the target concrete structure, spray it with distilled water and moisten it with moisture. After a predetermined time (about 3 to 5 minutes), a sheet having water absorption is applied to the surface of the concrete structure. Adhering and leaving for about 90 seconds, the surface of the concrete structure is impregnated with moisture.

  Next, the sheet is placed on a petri dish, the reagent A is collected with a dropper or the like and dropped, the reagent A is included in the sheet, and left for about 3 minutes. Here, in order to accelerate the reaction, the reagent C may be used instead of the reagent A.

  The reagent A used in this example is a solution A obtained by mixing and diluting a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II. This hydrochloric acid aqueous solution I is a solution obtained by adding 167 ml of special grade hydrochloric acid to about 50 ml of distilled water, and cooling to 250 ml with distilled water. On the other hand, the ammonium molybdate aqueous solution II is a solution obtained by dissolving 55 g of special grade ammonium molybdate (58.4 g of special grade ammonium molybdate tetrahydrate) in about 200 ml of warm distilled water and cooling to room temperature. Reagent A is a solution obtained by adding ammonium molybdate aqueous solution II little by little to hydrochloric acid aqueous solution I and diluting a solution of 500 ml with distilled water 5 times or 10 times.

  Finally, the reagent B is dropped on the sheet and it is confirmed that the color changes to blue. This reagent B is a solution obtained by dissolving 6 g of L (+)-ascorbic acid with 30 ml of distilled water. The reagent B may be L (+)-ascorbic acid powder. In addition, when silica is not contained in the concrete modifier, there is no discoloration.

  According to this example, after applying the concrete modifier to the target concrete structure, whether or not the concrete modifier was applied with a silicate-based concrete modifier containing the original silica. It can be easily inspected.

  As described above, the method for inspecting a concrete modifier according to the present embodiment can easily inspect whether or not it is a silicate-based concrete modifier containing silica by using the reagent A. Is possible. In addition, the reaction can be promoted by using the reagent C, and the reagent B can be used to change the color of the solution to a deep color (blue), which can be easily recognized.

  In addition, this application is not limited to this embodiment, It can implement in a various form. For example, in this embodiment, after dropping the solution A onto a predetermined sheet, the reaction is confirmed by dropping the reagent B onto the sheet impregnated with the solution A, but before adding the reagent B, the tartaric acid solution or By dropping oxalic acid, it is possible to prevent reaction with phosphorus when phosphorus is contained in water or a concrete modifier. In this way, it is possible to inspect whether or not it is a silicate-based concrete modifier.

  In addition, distilled water or tap water is used as the liquid used for cleaning or diluting the concrete structure, but in particular, when tap water is used, an erroneous reaction may be exhibited. Even in this case, it was possible to determine whether or not the concrete modifier was sufficiently applied with the degree of discoloration, but it was confirmed that a false reaction can be prevented by using a tartaric acid solution. Specifically, the solution A may be dropped on a predetermined sheet, the tartaric acid solution may be dropped, and then the reagent B may be dropped on the sheet impregnated with the solution A.

DESCRIPTION OF SYMBOLS 10 Concrete structure 10a Surface 15 Distilled water 20 Sheet 25 Dropper 30 Mounting stand

Claims (7)

A method for inspecting a concrete modifier for inspecting that a silicate-based concrete modifier has been applied to the surface of a concrete structure,
After cleaning the surface of the target concrete structure,
After moistening the surface of the concrete structure with moisture and impregnating the moisture on the surface of the concrete structure into a sheet having water absorption,
Inspecting the concrete modifier characterized in that a solution A diluted by mixing a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II is dropped onto the sheet, and the presence or absence of construction is confirmed by the presence or absence of discoloration of the sheet. Method. After dripping the solution A onto the sheet,
The method for inspecting a concrete modifier according to claim 1, wherein L (+)-ascorbic acid is added to the sheet.   The method for inspecting a concrete modifier according to claim 2, wherein a tartaric acid solution or oxalic acid is dropped before adding the L (+)-ascorbic acid. A method for inspecting a concrete modifier for inspecting that a silicate-based concrete modifier has been applied to the surface of a concrete structure,
After cleaning the surface of the target concrete structure,
After moistening the surface of the concrete structure with moisture and impregnating the moisture on the surface of the concrete structure into a sheet having water absorption,
A solution C, in which an antimonyl potassium tartrate solution is mixed, is added dropwise to a solution A diluted by mixing a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II, and the presence or absence of construction is confirmed by the presence or absence of discoloration. A method for inspecting a concrete modifier characterized by that. Collect and dilute the concrete modifier to be constructed on the surface of the concrete structure to be constructed,
The concrete modifier modified by adding the diluted concrete modifier to the solution A diluted by mixing the hydrochloric acid aqueous solution I and the ammonium molybdate aqueous solution II, and depending on the presence or absence of discoloration of the mixed solution. A method for inspecting a concrete modifier, characterized by inspecting whether or not it is an agent. A concrete modifier inspection device that inspects that a silicate-based concrete modifier has been applied to the surface of a concrete structure,
After the surface of the concrete structure is moistened with moisture, a lower sheet having water absorption to impregnate the moisture,
An upper sheet that is disposed above the lower sheet, and in which the solution A diluted by mixing the hydrochloric acid aqueous solution I and the ammonium molybdate aqueous solution II is fixed to the surface of the lower sheet;
A blocking sheet that is disposed between the lower sheet and the upper sheet, prevents contact between the upper sheet and the lower sheet, and moisture penetration;
The upper sheet, the lower sheet, and the blocking sheet are fixed at least on one end side,
An inspection device for a concrete modifier, wherein the shielding sheet is detachable. A method for inspecting a concrete modifier for inspecting that a silicate-based concrete modifier is being applied to the surface of a concrete structure,
Adhering a sheet having water absorption on the surface of the concrete structure,
After the silicate concrete modifier is applied, the sheet is collected,
A test of a concrete modifier characterized in that a solution A diluted by mixing a hydrochloric acid aqueous solution I and an ammonium molybdate aqueous solution II is dropped on the sheet, and the presence or absence of construction is confirmed by the presence or absence of discoloration of the sheet. Method.

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