JP2807423B2 - Construction method of antibacterial concrete and antibacterial mixed powder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an antibacterial concrete capable of directly imparting an antibacterial property to a concrete floor and an antibacterial mixed powder.

[0002]

2. Description of the Related Art Recently, a facility where an unspecified number of people enter and leave,
Alternatively, infections in facilities with many sick or susceptible persons, such as medical facilities and facilities for the elderly, have become a problem. In particular, with the development of antibiotics, the immunity of bacteria to antibiotics has increased, and recently methicillin-resistant Staphylococcus aureus (MRSA), which has resistance to all antibiotics that can be administered internally by injection or buccal administration, etc.
Has been confirmed, and the theory has been presented that bacteria may have not only the ability to learn antibiotics but also the ability to transmit immunity between bacteria. And MRSA
Nosocomial infection due to contact or airborne infection is a serious problem because it is immediately fatal. For example, it is said that more than 90% of hospitals have had nosocomial infections, and that the number of deaths of nosocomial infections has reached a considerable number exceeding ten thousand units.

[0003] Here, bacteria such as MRSA that come into contact with or infect with the air adhere to and float on dust as a carrier, and adhere to all parts of the room. For this reason, disinfection with a disinfectant requires wiping, for example, all the floors and walls, so that periodic work is very burdensome, and is ineffective for the disinfectant used, for example, spores. There are alcohols and phenols that are effective for MRSA, etc., halogen compounds that are partially effective for spores and are effective for MRSA, etc., or aldehydes that are effective for any bacteria including MRSA. However, it penetrates a commonly used wallpaper and dissolves a synthetic resin material such as a wallpaper or a coated floor, thereby damaging the surface to be disinfected.

Therefore, the present invention focuses on the current situation and problems as described above, and is not a short-term measure by a single measure such as disinfection, but is durable and has a reduced work load such as disinfection work. The concrete floor can be directly provided with antibacterial properties so as not to damage the facility itself. Heretofore, there has been no idea of directly giving the concrete an antibacterial property, and much less that method has been disclosed.

[0005]

By the way, as a method for directly imparting antibacterial properties to a concrete floor, a method has been conceived in which an appropriate amount of an antibacterial agent is blended with cement or aggregate, kneaded and cast. But to have antibacterial properties, the antibacterial agent must be exposed on the concrete surface,
According to the above method, a large amount of the antibacterial agent is required in order to uniformly disperse the antibacterial agent on the concrete surface layer, which causes impractical problems such as ultra-high price and strength deterioration.

Accordingly, the present invention has been made in view of the above-described problems, and has been made in view of the above problems. It is intended to provide a method and an antibacterial mixed powder.

[0007]

In order to solve the above-mentioned problems, the present invention provides an antibacterial mixture containing at least aggregate, cement, and an antibacterial agent in the cast concrete surface layer when the cast concrete surface layer is not cured. An antibacterial concrete construction method characterized by spraying powder to form an antibacterial concrete surface layer integrated with the surface layer on the cast concrete surface layer.

[0008] The spray amount of the antibacterial mixed powder is about 5 kg.
/ M ^{2 to} 10 kg / m ² , most preferably. If the amount is significantly less than 5 kg / m ^2, it is extremely difficult to spray the antibacterial agent uniformly. If the amount is significantly more than 10 kg / m ² , the antibacterial agent may not be exposed on the surface.

[0009] The present invention is also an antibacterial mixed powder containing at least aggregate, cement and an antibacterial agent for spraying on the cast concrete surface layer when the cast concrete surface layer is not cured.

As the antibacterial agent in the method for constructing the antibacterial concrete and the antibacterial mixed powder of the present invention, an organic antibacterial agent can be used.
It is preferable to use an inorganic antibacterial agent from the viewpoint of floor surface deterioration and antibacterial safety, and particularly preferable to use a silver antibacterial agent from the viewpoint of antibacterial effectiveness. The proportion of this antibacterial agent is
It is preferably at least about 0.5% by weight based on the total amount.
That is, the antibacterial mixed powder of the present invention has, for example, about 5
0 to 85% by weight, about 10 to 49.5% by weight of cement, and about 0.5 to 5% by weight of antibacterial agent.

[0011]

When the surface layer of the cast concrete (hereinafter referred to as cast concrete) starts tightening after the casting of fresh concrete, an antibacterial mixed powder is sprayed on the surface layer of the cast concrete. The mixed powder absorbs excess water existing in the cast concrete surface layer, hydrates it and integrates with the cast concrete surface layer, and forms a new concrete surface layer on the cast concrete layer I do. Moreover, at this time, the antibacterial agent is uniformly scattered in the new concrete surface layer and is exposed to the surface. When bacteria adhere to such a concrete surface, the bacteria are killed by the action of an antibacterial agent.

[0012]

An embodiment of the present invention will be described below.
The antibacterial mixed powder of the present invention is a mixed powder containing at least aggregate, cement and an inorganic antibacterial agent, preferably a silver antibacterial agent. Therefore, first, the inorganic antibacterial agent and the silver antibacterial agent will be described.

The inorganic antibacterial agent is obtained by supporting a metal ion on an inorganic compound. The silver ion is optimal as the metal ion, but a copper ion, a zinc ion or the like, or a combination thereof is also conceivable. The silver-based antibacterial agent is obtained by supporting silver ions on an inorganic compound. Any inorganic compound can be used. For example, inorganic adsorbents such as activated carbon, activated alumina and silica gel, inorganic ion exchangers such as zeolite, hydroxyapatite, zirconium phosphate, titanium phosphate, potassium titanate, hydrous bismuth oxide, hydrous zirconium oxide, hydrotalcite, etc. Is mentioned.

As a method for supporting silver ions on these inorganic compounds, an appropriate supporting method can be adopted. For example, a method of supporting by physical adsorption or chemical adsorption, a method of supporting by an ion exchange reaction, a method of supporting by a binder, a method of supporting a silver compound by driving it into an inorganic compound, vapor deposition, dissolution deposition reaction, thin film formation such as sputtering A method of forming a thin layer of a silver compound on the surface of an inorganic compound by a method and supporting the same is exemplified.

Among the above inorganic compounds, an inorganic ion exchanger is preferred because it can strongly support silver ions, and zeolite and zirconium phosphate are particularly preferably used. Specific examples of the compound include, for example, “Novalon A
Commercially available products such as "G-300" (manufactured by Toa Gosei Chemical Co., Ltd., zirconium phosphate supporting silver ion) and "Zeomic AW-10D" (manufactured by Sinanen New Ceramic Co., Ltd., zeolite supporting silver ion) can also be used.

As an example of the above, an antibacterial zeolite is disclosed in Japanese Patent Application Laid-Open No. 60-202162, in which a part or all of ion-exchangeable ions in a zeolite such as a natural zeolite or a synthetic zeolite is converted to silver nitrate or sulfuric acid. About 0.1 to 15% by weight of silver ions using silver or the like, and 0.1 to 8% by weight of copper ions and 0.1 to 8% by weight of zinc ions in addition to the above ions. Examples such as substituted antimicrobial zeolites are shown by way of example.

The particle size of the silver-based antibacterial agent carrying silver ions in the present invention is in the form of fine particles having an average particle size of 10 μm or less, preferably about 0.01 to 5 μm, from the viewpoint of finishing properties and effective area of the antibacterial agent. It is desirable.

The compounding ratio of the antibacterial agent in the antibacterial mixed powder of the present invention is preferably about 0.5% by weight or more based on the total amount of the antibacterial mixed powder. The antibacterial action of this antibacterial agent can be sufficiently exerted at 1% by weight and may be 3% by weight or more, but the antibacterial action is hardly changed even if it is more than necessary.

That is, the antibacterial mixed powder of the present invention is blended so as to contain about 50 to 85% by weight of aggregate, about 10 to 49.5% by weight of cement, and about 0.5 to 5% by weight of antibacterial agent. Formed. It is to be noted that a color can be appropriately given to the concrete surface by adding a pigment.

As the above-mentioned aggregate, for example, any of emery, caborundum, alundum, artificial lightweight aggregate, iron, stainless steel, silica sand, slag, or a mixture of these appropriately selected can be used. However, by using abrasion-resistant aggregates such as emery, caborundum, and alundum, and those containing a hygroscopic aggregate such as an artificial lightweight aggregate, the strength of the antibacterial concrete surface layer can be further increased. . The average particle size of the aggregate is about 0.6 mm to 1.2 m.
m is preferred.

As the above cement, besides Portland cement, blast furnace cement, silica cement, fly ash cement, masonry cement, white cement, iron cement, jet cement, expanded cement, colloid cement, alumina cement and the like can be used. . Further, as the pigment, a pigment such as a chromium oxide pigment, a titanium pigment, and a red iron pigment can be used.

It is optional to add an organic antibacterial agent to the above. As the organic antibacterial agent, an organic antibacterial agent such as a bis (pyridine-2-thiol-1-oxide) zinc salt, so-called zincbilithion, or an organic nitrogen sulfur halide compound can be suitably used.

Next, a method for applying the antibacterial concrete of the present invention will be described.

Before casting concrete, fresh concrete and antibacterial mixed powder are prepared.
The fresh concrete is not particularly limited, and may be appropriately selected. For example, 272 kg of Portland cement and 100 kg of coarse aggregate per 1 m ³ are exemplified.
7 kg, fine aggregate 827 kg, AE agent 0.109 kg
And a mixture of water and water containing 183 kg can be used.

The fresh concrete is poured, and after the completion of the driving, the surface is made substantially horizontal using a concrete finisher. When the poured concrete surface layer is not cured, that is, while the poured concrete surface layer is in a wet state, preferably when tightening is started, or When the leaching of the breathing water is completed, the antibacterial mixed powder is evenly sprayed on the surface of the cast concrete using an automatic sprayer or the like.

[0026] The application rates of the antibacterial powder mixture at this time are most preferably about ^{5kg / m 2 ~10kg / m 2} .

After spraying the antibacterial mixed powder in this way,
When the antibacterial mixed powder absorbs the moisture of the underlying concrete and changes its color, it improves adhesion between the antibacterial mixed powder and the concrete and facilitates rubbing after the concrete is tightened to generate small waves. Use a large ruler to apply the cloth. Then, when the hardening of the cast concrete surface layer has progressed to such an extent that footprints do not appear, the concrete layer is pressed down with a mechanical iron and the like, and finished with a gold iron. Finally, air-curing curing is performed until the concrete surface is dried, and watering or moisturizing curing is preferably performed.

If concrete is constructed in this way,
The sprayed antibacterial mixed powder absorbs excess water, such as breathing water, existing in the surface layer of the cast concrete, hydrates it and integrates it with the cast concrete layer of fresh concrete, Form a new concrete surface layer on the layer. In addition, the antibacterial agent is uniformly scattered in the new concrete surface layer and is exposed on the surface, and the new concrete surface layer is an antibacterial concrete surface layer. That is, MRSA is applied to the surface of this antibacterial concrete surface layer.
If such bacteria adhere, the bacteria can be killed by the action of the antibacterial agent exposed on the surface.

Further, the antibacterial mixed powder absorbs excess water such as breathing water, which is a factor of reducing the surface strength of the concrete, and hydrates it to form an antibacterial concrete surface layer. In addition to being able to increase the concrete surface layer strength, it is possible to save the labor and time conventionally used for processing excess water, and also to obtain the above effects by mechanically spraying, so that it is extremely efficient Construction can be performed.

[0030]

As described above, according to the antibacterial mixed powder of the present invention, the antibacterial property is exhibited permanently, the work load such as disinfection work is reduced, and the facility itself may be damaged. No antibacterial concrete surface layer can be formed. In addition, the concrete surface layer can be strengthened. In addition, the amount of the antibacterial agent to be used is small, so that it is economical, and since the above effect can be obtained only by mechanically spraying, the construction efficiency is high, and it is extremely practical.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI A01N 59/16 A01N 59/16 Z 59/20 59/20 Z E04B 1/72 E04B 1/72

Claims (7)

(57) [Claims] When the cast concrete surface layer is not cured, an antibacterial mixed powder containing at least aggregate, cement and an antibacterial agent is sprayed on the cast concrete surface layer, and the surface is spread on the cast concrete surface layer. A method for constructing antibacterial concrete, comprising forming an antibacterial concrete surface layer integrated with the layer. 2. The method according to claim 1, wherein the antibacterial agent is an inorganic antibacterial agent, particularly preferably a silver antibacterial agent. 3. An antibacterial mixed powder of about 5 kg / m ² to 10
The method for constructing antibacterial concrete according to claim 1 or ^{2, wherein the} application rate is kg / m2. 4. An antibacterial mixed powder containing at least aggregate, cement, and an antibacterial agent for spraying on the cast concrete surface layer when the cast concrete surface layer is not cured. 5. The antibacterial mixed powder according to claim 4, wherein the antibacterial agent is an inorganic antibacterial agent, particularly preferably a silver antibacterial agent. 6. The antibacterial agent comprises about 0.5% by weight based on the total amount.
The antibacterial mixed powder according to claim 4 or 5, which is blended as described above. 7. An aggregate for spraying on the cast concrete surface layer when the cast concrete surface layer is not cured.
An antibacterial mixed powder containing 85% by weight, about 10-49.5% by weight of cement, and about 0.5-5% by weight of an antibacterial agent.