Functional agent and concrete surface treatment method using same

Abstract

To solve a problem associated with construction of a concrete structure that it is difficult to recognize and control the coated area and the amount of coating on the concrete structure coated with various functional chemicals, any of which is an aqueous functional chemical that becomes colorless after coating / drying.SOLUTION: A surface treating agent for concrete such as a joint face treating agent, a setting retarder, and a surface modifier is blended with a fluorescent material to prepare a functional chemical; the prepared functional chemical is applied to the surface of concrete; and subsequently, UVA-derived fluorescence on the concrete surface is measured, checking the condition of the concrete surface coated with the functional chemical.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a functional agent and a method for treating the surface of concrete using the same. [Background technology]

[0002] Various functional agents are applied during the construction of concrete structures. Examples of such functional agents include joint surface treatment agents that improve the adhesive performance of concrete joint surfaces during construction, and retarders that delay the hardening of the surface in order to ensure the shear strength of the joint surfaces (see, for example, Patent Document 1). Furthermore, when a concrete structure is completed, a surface modifier whose main component is calcium silicate is applied to improve durability.

[0003] However, all of the functional agents become colorless after application and drying, making it difficult to grasp and manage the application range and application amount. At construction sites, the application amount of functional agents is generally managed by using up the entire amount per unit area specified by the manufacturer, but it is not possible to determine after application whether the agent has been applied evenly to the specified areas of the structure. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 61-92261 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present invention is to provide a functional agent and a concrete surface treatment method using the same, which makes it possible to easily determine whether the functional agent has been applied uniformly and to the desired area even after the functional agent has been applied to a concrete structure. [Means for solving the problem]

[0006] The present invention provides a functional agent comprising a fluorescent material blended into a surface treatment agent for concrete. The present invention also provides a method for treating the surface of concrete, comprising a coating step of coating the surface of concrete with the functional agent. Effect of the Invention

[0007] The functional agent of the present invention is characterized in that it is a surface treatment agent for concrete to which a fluorescent material has been blended, and the concrete surface treatment method of the present invention includes an application step in which the functional agent is applied onto the surface of the concrete, so that even after the functional agent has been applied to the concrete structure, it is possible to easily determine whether the functional agent has been applied uniformly and to the desired area. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a flow diagram illustrating one embodiment of the concrete surface treatment method of the present invention. [Diagram 2] FIG. 2 is a flow diagram for illustrating another embodiment of the method for treating a surface of concrete according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described.

[0010] The functional agent of the present invention is characterized in that a fluorescent material is blended into a surface treatment agent for concrete.

[0011] The surface treatment agent for concrete is not particularly limited, but examples thereof include known joint surface treatment agents, setting retarders, surface modifiers, etc., and among these, those which become colorless or transparent after application and drying are preferred as they are likely to achieve the effects of the present invention.

[0012] The fluorescent material is not particularly limited, but is preferably a fluorescent material that emits fluorescent light in the visible wavelength range when irradiated with UVA (long-wavelength ultraviolet light with a wavelength of 315 to 400 nm) from a black light, etc. Such fluorescent materials are known, and examples thereof include organic compounds such as coumarin, stilbene, and rhodamine; fine powders of inorganic compounds in which heavy metals or rare earth oxides such as europium are added as activators to metal oxides or sulfides such as aluminum, calcium, barium, magnesium, zinc, manganese, silicon, germanium, cadmium, strontium, and yttrium; and organic fluorescent pigments.

[0013] The amount of the fluorescent material added to the concrete surface treatment agent is, for example, 0.3 to 1.5 mass %. When applying multiple times, a thinner amount is more suitable, while when applying only once, a thicker amount is more suitable.

[0014] Next, the concrete surface treatment method of the present invention will be described. The method for treating a surface of concrete according to the present invention is characterized by comprising a coating step of coating the functional agent of the present invention onto a surface of concrete.

[0015] After the application step, for example, UVA generated by a black light is irradiated onto the concrete surface, and the fluorescent light emission is visually examined, making it possible to confirm the state of application of the functional agent onto the concrete surface.

[0016] FIG. 1 is a flow diagram illustrating one embodiment of the concrete surface treatment method of the present invention. In FIG. 1, first, the functional agent of the present invention is prepared (S100), and a coating step is performed to coat the functional agent on the concrete surface (S101). The means used in the coating step may be appropriately selected depending on the type of concrete surface treatment agent, and examples include a sprayer, a brush, a roller, etc. Also, a person skilled in the art can change the coating amount according to the purpose. Next, UVA is irradiated onto the concrete surface from a black light or the like, and the fluorescent emission is visually confirmed (S102). Note that instead of using an instrument such as a black light, it may be visually confirmed under sunlight. In this case, the fluorescent emission can be confirmed by using a filter or the like that can cut visible light of wavelengths other than the fluorescent emission (visible light) by the fluorescent material. The confirmation can also be made by photographing the fluorescent emission or by image processing the photographed photograph using a computer. Next, it is confirmed by the intensity of the emission (S103) whether the fluorescent emission is uniform and within a predetermined range, and if the fluorescent emission is uniform and within a predetermined range (Y), the process is terminated. On the other hand, if the fluorescence is not uniform and within the specified range (N), the functional agent is reapplied to the concrete surface (S104), and if necessary, the fluorescence is further confirmed as described above, and the process is terminated.

[0017] On the other hand, another embodiment of the concrete surface treatment method of the present invention includes a first application step of applying the functional agent of the present invention onto the concrete surface, and a second application step of further applying the functional agent of the present invention onto the coating film formed after the first application step, and is characterized in that the first application step and the second application step have different fluorescent emission wavelengths of the fluorescent material contained in the functional agent.

[0018] FIG. 2 is a flow diagram for explaining another embodiment of the method for treating a surface of concrete according to the present invention. In FIG. 2, first, the functional agent of the present invention is prepared (S200), and the first application step of applying the functional agent to the concrete surface is performed (S201). The means used in the first application step may be appropriately selected depending on the type of concrete surface treatment agent, and examples include a sprayer, a brush, a roller, etc. Also, a person skilled in the art can change the application amount according to the purpose. Next, UVA is irradiated onto the concrete surface from a black light or the like, and the fluorescent emission is visually confirmed (S202). Note that instead of using an instrument such as a black light, it may be visually confirmed under sunlight as described in the embodiment of FIG. 1. The confirmation may also be performed by photographing the fluorescent emission or by image processing the photographed photograph using a computer. An instrument that can selectively photograph only light of a specific frequency, such as a multispectral camera, may also be used. Next, it is confirmed by the intensity of the emission (S203) whether the fluorescent emission after the first application step is uniform and within a predetermined range, and if the fluorescent emission is uniform and within a predetermined range (Y), the process proceeds to the second application step (S205). On the other hand, if the fluorescence emission after the first application step is not uniform and within the predetermined range (N), the functional agent is reapplied on the concrete surface (S204), and if necessary, the fluorescence emission is confirmed as described above, and the process proceeds to the second application step (S205). The second application step is a step of further applying the functional agent of the present invention on the coating film formed after the first application step, with the exception that the first application step and the second application step have different fluorescence emission wavelengths of the fluorescent material contained in the functional agent. As an example, if the fluorescent material in the functional agent used in the first application step emits blue fluorescence, the fluorescent material in the functional agent used in the second application step is set to emit red fluorescence. In this way, it is possible to confirm whether the second application step was performed according to the procedure, compared to the case where the same fluorescent material is used in the first and second application steps. In other words, if the fluorescence emission after the second application step is uniform and within the predetermined range, the concrete surface should emit red fluorescence. The amount of fluorescent material added may be adjusted so that, when the first and second coating steps are carried out as planned, the final coated surface will fluoresce purple, which is a mixture of blue and red.In this way, whether the fluorescence emission after the second application process is uniform and within the specified range is confirmed by the intensity of the fluorescence emission (S207), and if the fluorescence emission is uniform and within the specified range (Y), the second application process is terminated. On the other hand, if the fluorescence emission after the second application process is not uniform and within the specified range (N), the functional agent is reapplied onto the concrete surface (S208), and if necessary, the fluorescence emission is further confirmed as described above, and the second application process is terminated (S205).

[0019] In the above, the coating process has been described using two steps, the first coating process and the second coating process, as an example. However, the present invention is not limited to this. It is also possible to prepare n fluorescent materials with different fluorescent emission wavelengths and perform n coating processes. EXAMPLES

[0020] The present invention will be further described below with reference to examples, but the present invention is not limited to the following examples.

[0021] Example 1 As a sample, a block-shaped concrete molded product was prepared. On the other hand, 200 g of a fluorescent powder pigment (mainly composed of inorganic phosphor (ZnS, Cu)) was added as a fluorescent material to 18 liters of the setting retarder to prepare a functional agent 1 of the present invention. The prepared functional agent 1 was applied to the surface of the above concrete molded article by brushing. Next, the surface of the concrete molded article was irradiated with UVA using a black light. As a result, blue fluorescence was visually confirmed in the areas where the brush was applied. On the other hand, no fluorescence was observed in the areas where Functional Drug 1 was to be applied. In addition, the unevenness of the amount of Functional Drug 1 applied by the brush could be confirmed by the intensity of the fluorescence.

[0022] Example 2 In Example 1, functional agent 1 containing a fluorescent material that emits blue light only when irradiated with UVA light was applied, and after confirming the fluorescence, functional agent 2 containing a fluorescent material (mainly composed of inorganic phosphor (ZnS, Cu) or organic phosphor (melamine formaldehyde resin)) that emits red light only when irradiated with UVA light was applied by brushing onto the applied surface. Next, the surface that had been coated twice with Functional Agent 1 and Functional Agent 2 was irradiated with UVA using a black light. As a result, purple fluorescence, a mixture of blue and red, was visually confirmed in the area where Functional Agent 2 had been brushed on the second time. On the other hand, only blue fluorescence was observed in the area where Functional Agent 1 had been brushed on once. Furthermore, unevenness in the amount of Functional Agent 2 applied by brushing could be confirmed by the intensity of the fluorescence.

[0023] When a retarder is used as a concrete surface treatment agent, this agent is removed by a water jet or the like as the construction progresses. However, by using the functional agent of the present invention, it also serves as a guide for the removal work, thereby achieving another effect of the present invention.

[0024] On the other hand, when a surface modifier is used as a concrete surface treatment agent, by checking the fluorescence emission of the functional agent over time, the degree of deterioration over time can be confirmed from the intensity of the fluorescence emission, thereby achieving another effect of the present invention.

Claims

1. A method for treating the surface of concrete, comprising a first application step of applying a functional agent, which is a surface treatment agent for concrete mixed with a fluorescent material, onto the surface of the concrete, and a second application step of applying the functional agent onto a coating film formed after the first application step, wherein the first application step and the second application step have different wavelengths of fluorescent emission from the fluorescent material contained in the functional agent, The surface treatment agent for concrete is a joint surface treatment agent or a setting retarder. A method for treating the surface of concrete.

2. 2. The method for treating a concrete surface according to claim 1, wherein the fluorescent material emits fluorescence when exposed to UVA.

3. A method for treating concrete surfaces as described in claim 2, further comprising a step of examining UVA fluorescence generated on the concrete surface after the first application step and / or the second application step, and confirming the application state of the functional agent on the concrete surface.

4. A first coating film comprising a first fluorescent material having a first fluorescent emission wavelength and a joint surface treatment agent or a setting retarder; A concrete having a surface coated with a second coating film including a second fluorescent material having a second fluorescent emission wavelength different from the first fluorescent emission wavelength, and a joint surface treatment agent or a setting retarder.

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