KR101009743B1 - Repairing agent for reinforcing the concrete - Google Patents

Abstract

PURPOSE: A repairing agent for reinforcing concrete is provided to ensure high strength after construction and to protect the inside and the outside of the concrete while recovering the performance of concrete with water resistance. CONSTITUTION: A repairing agent for reinforcing concrete comprises an A agent including polymeric MDI, polyol, and butylacetate and a B agent including polyoxypropylene diamine, diethyltoluene diamine, polyether polyol, and epoxysilane. The A agent is manufactured by the steps of: putting polymeric MDI in a reactor and raising the temperature of the reactor to 40°C; putting polyol in a reactor and raising the temperature of the reactor to 80 °C; performing a reaction at 80 °C for 2 hours; cooling the resultant to room temperature and adding butylacetate; and uniformly mixing the mixture for 15~25 minutes.

Description

Repairing agent for reinforcing the concrete

The present invention relates to a reinforcing agent for concrete reinforcement, and more specifically, a polyurea-based two-component type quick curing type, which was developed for multipurpose purposes such as quick repair and coating, and has a low viscosity to quickly penetrate into a matrix such as concrete to provide strong resistance. The present invention relates to a reinforcing agent for reinforcing concrete having high strength after forming and being used by mixing with sand, gravel, silica, and the like for concrete repair and flooring.

The penetration-intensifying inorganic repair agent generally used at home and abroad is composed of alkali silicates. Such alkali-based silicates form calcium silicates by reacting with calcium ions, which are the main components of concrete, at a very high rate, even if the surface tension is small. The calcium silicate thus formed is an insoluble and chemically very stable oxide that only protects the surface of the concrete and has a problem of not penetrating deeply into the concrete because the penetration depth is only about 5 mm, thereby appropriately protecting the concrete structure. There is a drawback to not playing a role.

According to a UK study that examined the causes of damage to concrete structures in the past decades, corrosion caused by reinforcing steel accounts for 47% of the overall performance deterioration of the structure, and corrosion caused by salt damage accounts for 66%. It is known. In Korea, since the three sides are composed of the sea, there are many areas where damage can occur, as well as the four seasons are clearly affected by shrinkage and expansion, and the neutralization of the exhaust gases due to the concentration of cities is severe. The durability of concrete is worse than that of any country. According to the Seoul Metropolitan Report <Corporate Condition Survey and Prevention Measures for Concrete Structures> published in December 1997, some of the concrete structures managed by the city have been eroded, resulting in cracks, peelings or droppings in concrete. 18%. In addition, the ratio of maintenance of the structure accounted for more than 40% of Seoul's total construction budget in 2000. For the repair of the structure, not only Seoul but also the large-scale organizations use huge budgets for the repair. Is expected to continue to surge. In addition, in Tokyo, Japan, where our environment is similar, the maintenance cost of existing structures accounts for 47% of the total construction budget in 2000. In 2001, maintenance costs are expected to exceed new facilities.

The maintenance materials used for the maintenance of reinforced concrete structures are mainly resin-based and cement-based materials.However, the repair methods that use these materials take actions when the performance deterioration is in full swing. There are many. In addition, when repairing the section, it is necessary to remove the concrete that has degraded durability, and in this process, a large amount of noise, dust, vibration, construction waste, etc. increases the burden on the environment and economic burden.

In addition, the impact caused by removing the concrete may cause damage due to cracks, etc., in the surrounding concrete, which is not deteriorated due to the impact. In addition, when reinforcing the structure using fiber reinforcement materials without improving the durability and reinforcing corrosion of the concrete, the structural function of the load is improved, but since the corrosion of the steel can be continued in the structure, the durability of the reinforced concrete It may not be effective for performance recovery.

The repair method currently in use is largely divided into surface coating method, crack injection method, and filling method according to the type of damaged part. The materials used for the surface coating method are beautifully colored, have excellent initial adhesive strength and chemical resistance, and are economical and workable, and many products are commercially available as paints. It hardens and causes peeling (floating), and it is easily broken by impact. In recent years, shrinkage and expansion rate have been achieved by using an aqueous paint or the like which has improved physical properties or by adding a silica material to the polymer material as a filler. And efforts to complement the brittle properties due to curing. However, the surface coating method is only a repair of the crack surface, so in the case of a progressive crack, the elongation of cracks is poor. Since the thickness of the coating material is thin, the durability of the repaired part is increased over time after repair. There is a risk of deterioration, so be careful. In addition, the material used for the surface coating method is used to protect the structure from deterioration factors rather than to improve the durability of the deteriorated concrete, and as shown in the present invention, In addition, there is a big difference in the functionality from the penetration-improving inorganic repair agent to improve the durability of damaged concrete.

In the case of the crack injection method, the crack injection material is epoxy resin and is most commonly used because of its small shrinkage and early strength. There is a problem such as.

In the case of the filling method, an epoxy mortar or an acrylic mortar is used as a material to be used. This filling method removes the defects of the structure, mixes it with the cement mortar using an epoxy or acrylic resin at a constant mixing ratio, and then fills and installs the defective parts of the structure. Although it has excellent short-term adhesion, it can be surely repaired physically. However, it has not been able to build chemical treatment technology for each deterioration factor such as neutralization, salt, east sea, chemical corrosion, etc. The use of inorganic materials together can cause problems in the long-term integration with the mother.

Therefore, the new surface treatment method and repair agent which can protect the interior and exterior of the concrete as well as waterproof while overcoming the disadvantages of the general surface coating method, the injection method and the filling method as described above and recovering the performance of the degraded concrete. There has been a demand for it.

Accordingly, the present invention has been made to solve the conventional problems, to provide a new concrete reinforcement repair agent that can protect the interior and exterior of the concrete as well as waterproof while restoring the performance of the concrete is reduced in water resistance. It is a problem.

In addition, another problem of the present invention is to provide a concrete surface treatment method using the above-mentioned reinforcement for concrete reinforcement.

The reinforcing agent for concrete reinforcement of the present invention that solved the above problems is 40 to 50 parts by weight of polymeric M-Dia, 25 to 35 parts by weight of polyol, 20 to 30 parts by weight of butyl acetate and 30 to 40 polyoxypropylene diamine It is composed of the agent B comprising parts by weight, 40 to 50 parts by weight of diethyltoluenediamine, 25 to 35 parts by weight of polyether polyol, and 5 to 10 parts by weight of epoxysilane,

The agent A was metered into the reactor, the polymer M, the temperature of the reactor to slowly increase the temperature to 40 ℃, and then put the polyol in small amounts in the reactor, the temperature of the reactor to 80 ℃, the temperature of the reactor 80 After reacting at 2 ° C. for 2 hours, the mixture is slowly cooled, and butyl acetate is added to the reactants that have reached room temperature, followed by uniform stirring for 15 to 25 minutes.

Here, the input amount of the polyol added in small amounts is characterized in that 50L / min.

In addition, the present invention by the high pressure water washing or grinding treatment step to completely remove the foreign matter and dust adhering to the concrete base surface and drying to less than 8% moisture content; After the surface was cleaned up, the polymeric M-Dai was metered into the reactor, the temperature of the reactor was slowly raised to 40 ° C., the polyol was added to the reactor little by little, the temperature of the reactor was raised to 80 ° C., and then After reacting for 2 hours at a temperature of 80 ° C., the mixture was slowly cooled and butyl acetate was added to the reaction product which reached room temperature, followed by stirring for 15 to 25 minutes, 30-40 parts by weight of polyoxypropylene diamine, and 40-50 weight of diethyltoluenediamine. A step of applying a water-retaining agent obtained by uniformly stirring and mixing the agent B comprising 25 to 35 parts by weight of a polyether polyol to the arranged base surface; And it provides a concrete surface treatment method consisting of the step of applying a water repellent agent after the drying sufficiently and then applying a top coating agent (TOP Coating) to the roller or airless on the upper surface.

Here, the composition ratio of the polymeric MD, polyol and butyl acetate constituting the agent A is characterized in that the polymeric MD is 40 to 50 parts by weight, polyol 25 to 35 parts by weight, butyl acetate 20 to 30 parts by weight. do.

Here, the mixing ratio of the agent A and agent B is characterized in that 1: 1 (v / v).

Here, before applying the repair agent is characterized in that it further comprises the step of applying the silica sand in the depressions on the concrete base surface.

The reinforcing agent for concrete reinforcement according to the present invention has an effect that can be used as a multi-purpose purpose such as rapid repair and coating of concrete for forming concrete coatings as a quick curing agent of two-component urea series.

In addition, the water-retaining agent of the present invention has a low viscosity to quickly penetrate and deeply penetrates the floor, such as concrete, has the effect of maintaining a strong adhesion for a long time to form a strong resistance.

In addition, the repair agent of the present invention can be mixed with industrial quartz, sand, gravel, silica sand and the like to improve the durability of the concrete has the effect of showing a strong strength for repairing concrete.

Hereinafter, the present invention will be described in more detail.

The present invention is a concrete fragment repair, concrete re-coating coating, floor crack repair, factory. office. Restaurant. hospital. It relates to a reinforcement for concrete reinforcement used for overcoming the limitations of breakage due to falling out of concrete and existing flooring materials, such as a clean room, and the repairing agent according to the present invention is a polymer MDI, A agent containing butyl acetate, and a B agent including polyoxypropylene diamine, diethyltoluenediamine, polyether polyol, and epoxysilane.

Here, the agent A comprises 40 to 50 parts by weight of a polymeric MDI, 25 to 35 parts by weight of a polyol, and 20 to 30 parts by weight of butyl acetate.
The polyol refers to an organic compound having two or more hydroxyl groups (-0H) at the terminal of the molecule, and polyols generally used in the art may be used.

In addition, the agent B includes 30 to 40 parts by weight of polyoxypropylene diamine, 40 to 50 parts by weight of diethyltoluenediamine, 25 to 35 parts by weight of polyether polyol, and 5 to 10 parts by weight of epoxysilane.
The polyether polyol refers to an organic compound having two or more hydroxyl groups at its terminal as a structure in which an ether group is bonded to a molecular structure, and may be a polyether polyol generally used in the art.

According to the present invention, the agent A is metered into the reactor polymeric M, and slowly increase the temperature of the reactor to 40 ℃, and then put a small amount of polyol in the reactor, after raising the temperature of the reactor to 80 ℃ After reacting for 2 hours at 80 ° C. in the reactor, the mixture is slowly cooled and butyl acetate is added to the reactants that have reached room temperature, followed by uniform stirring for 15 to 25 minutes.

The polyol is added to the reactor after metering the polymer MDIA and raising the temperature of the reactor to 40 ° C. At this time, the polyol is slowly added in small amounts. Preferably the polyol is added in an amount of 50 L / min.

According to the present invention, the reactor used to prepare the agent A is by using a jacket installed on the outer wall of the reactor tank, by slowly supplying steam or hot water to the jacket to check whether the temperature rise of the reactor is gradually Increase the temperature Slowly supplying the steam or hot water to increase the temperature is because the reaction product may vary depending on the reaction temperature, and if it is added at a time, it may be difficult to control the temperature in the subsequent process.

In addition, the reaction for 2 hours at a temperature of 80 ℃ of the reactor is because if the reaction time is less than this or if the reaction for a long time there is a problem that can not obtain the desired reaction product in the present invention. That is, the purpose of this reaction is to increase the molecular weight of the reactants by polymerizing the polymer MDI with the polyol.

For example, when agent A and agent B react to form a coating film, the agent <A agent> is small in size and the agent <B agent> is large in size, so that when the coating film is formed, it cannot exhibit the desired coating properties. If the amount of agent A> is high and the amount of agent <B> is small, the number of agent <A> is large when the film is formed. Because there is not.

Therefore, the reaction here is to make the size and quantity of <A agent> most suitable when reacting with <B agent>.

Here, the meaning of the size and quantity is described with reference to the following general urea reaction mechanism, the reaction disclosed in the present invention means to make isocyanate (Isosyanate) in the following reaction mechanism. That is, the size and quantity means the production amount of the isocyanate (Isosyanate), the reaction temperature and time disclosed in the present invention is to create an optimum condition for making the isocyanate according to the object of the present invention.

Urea Reaction Mechanism

According to the present invention, the reaction is allowed to cool slowly after reacting at a temperature of 80 ° C. for 2 hours. At this time, cooling water is slowly added to a jacket outside the reactor to check the temperature of the reactor.

Referring to the concrete surface treatment method using a concrete reinforcing agent of the present invention as described above are as follows. However, the present invention is not limited to the following description.

According to the present invention, first, the high-pressure water washing or grinding treatment completely removes foreign substances and dust adhering to the concrete base surface and dries to 8% or less of moisture.

This is to improve the penetration of the repair agent to the concrete surface by completely removing foreign substances such as dust and dirt attached to the base surface.

At this time, the concrete is ground and / or ground according to the smoothness and slope of the concrete.

After the surface was cleaned up, the polymeric M-Dai was metered into the reactor, the temperature of the reactor was slowly raised to 40 ° C., the polyol was added to the reactor little by little, the temperature of the reactor was raised to 80 ° C., and then After reacting for 2 hours at a temperature of 80 ° C., the mixture was slowly cooled and butyl acetate was added to the reaction product which reached room temperature, followed by stirring for 15 to 25 minutes, 30-40 parts by weight of polyoxypropylene diamine, and 40-50 weight of diethyltoluenediamine. In addition, the water-retaining agent which uniformly stirred and mixed the agent B which consists of 25-35 weight part of polyether polyols is prepared, and apply | coats to a concrete base surface. At this time, the application of the repair agent is sprayed by spray mixing in a spray gun.

After application of the repairing agent, it is sufficiently dried and then top coated with a roller or airless for a beautiful finish on the upper surface to complete the concrete surface treatment.

According to the present invention, the top coating agent may be selected and used appropriately according to the conditions of the site, and examples thereof include a top coating agent mainly composed of an elastomeric urethane resin and an epoxy resin.

On the other hand, the composition ratio of the polymeric MD, polyol, and butyl acetate constituting the agent A used in the surface treatment method is 40-50 parts by weight of polymeric MD, 25-35 parts by weight of polyol, and 20-30 weight of butyl acetate. It is preferred to be prepared to include a part.

In addition, the mixing ratio of the agent A and agent B is preferably mixed and stirred so as to be 1: 1 (v / v).

According to the present invention, before applying the repair agent to the surface may further comprise the step of applying the silica sand in a recess in the concrete base surface. This is to reinforce the deep trench is a problem that must be applied several times the repair agent.

The repair agent of the present invention described above can be used as a two-component urea-based rapid curing agent for the purpose of rapid repair and coating of concrete, such as forming concrete, and for multipurpose purposes such as concrete. It penetrates deep and maintains adhesion for a long time to form strong resistance.

In addition, the repair agent of the present invention can be used in combination with industrial quartz, sand, gravel, silica sand, etc. to improve the durability of the concrete to exhibit a strong strength for repairing concrete.

Claims (6)

A agent comprising 40 to 50 parts by weight of a polymer mdia (a), 25 to 35 parts by weight of a polyol (b), and 20 to 30 parts by weight of butyl acetate (c);
In the repair agent for penetrating concrete reinforcement composed of B agent comprising 30 to 40 parts by weight of polyoxypropylene diamine, 40 to 50 parts by weight of diethyltoluenediamine, 25 to 35 parts by weight of polyether polyol, and 5 to 10 parts by weight of epoxysilane. ,
The agent A was metered in the polymer M (a) in the reactor, the temperature of the reactor was raised to 40 ℃, the polyol (b) was put into the reactor, the temperature of the reactor was raised to 80 ℃, the reactor After reacting for 2 hours at a temperature of 80 ℃, the butyl acetate (c) is added to the reaction product cooled to reach the room temperature, and it is prepared by stirring uniformly for 15 to 25 minutes, characterized in that the repair agent for reinforcing-type concrete reinforcement. The method of claim 1,
The input amount of the polyol (b) is a repair agent for reinforcing-type concrete, characterized in that 50L / min. High pressure water washing or grinding process to completely remove the foreign matter and dust adhered to the concrete base surface and to dry to less than 8% moisture content;
After the substrate surface was cleaned up, the polymeric MD (a) was metered into the reactor, the temperature of the reactor was raised to 40 ° C, the polyol (b) was put into the reactor, and the temperature of the reactor was raised to 80 ° C. After reacting for 2 hours at a temperature of 80 ° C. in the reactor, the mixture was cooled to room temperature, and butyl acetate (c) was added thereto, stirred for 15 to 25 minutes, and 30-40 parts by weight of polyoxypropylene diamine and diethyl. Applying a repairing agent for reinforcing-type concrete reinforcement by uniformly stirring and mixing agent B comprising 40 to 50 parts by weight of toluenediamine and 25 to 35 parts by weight of polyether polyol; And
Concrete coating method comprising the step of applying the water-repellent repairing agent for the reinforcement-type concrete reinforcement and then drying the top coating agent (TOP Coating) on the upper surface of the roller or airless. The method of claim 3, wherein
The composition ratio of the polymeric Mdiai (a), the polyol (b), and the butyl acetate (c) which comprises the said agent A is 40-50 weight part of the polymeric Mdiai (a), 25-35 weight part of polyols (b), Butyl acetate (c) Concrete surface treatment method characterized in that it comprises 20 to 30 parts by weight. The method of claim 3, wherein
The mixing ratio of the A agent and the B agent is a concrete surface treatment method, characterized in that 1: 1 volume ratio. The method of claim 3, wherein
Concrete surface treatment method characterized in that it further comprises the step of applying the silica sand in the recessed portion of the concrete base surface before applying the repair agent for the penetration-type concrete reinforcement.