KR102193955B1 - T²SA polymer manufacturing method and TGRS repairing, reinforcing and coating method using the same - Google Patents

Abstract

The present invention relates to a T^2SA polymer manufacturing method and a TGRS repair, reinforcement, and coating method using the same. The T^2SA polymer manufacturing method and the TGRS repair, reinforcement, and coating method using the same comprise the steps of: chipping and cleaning a reinforced concrete structure to be repaired; removing rust from reinforcing bars in the reinforced concrete structure; installing a reinforcing material in the reinforced concrete structure; applying an alkali imparting agent to the reinforced concrete structure; applying a primer to the reinforced concrete structure to which the alkali imparting agent is applied; and pouring repair mortar on the primer so that the reinforcing material and the reinforced concrete structure are buried, and further comprise a step of applying a neutralization prevention and high-performance coating agent to the surface on which the repair mortar is poured. According to the present technique, provided is a method for protecting reinforcing bars and performing repair and reinforcing coating on a concrete structure, which ensures improved acid resistance.

Description

T²SA polymer manufacturing method and TGRS repairing, reinforcing and coating method using the same}

The present invention relates to a T²SA polymer manufacturing method and a TGRS repair reinforcement coating method using the same, and more specifically, to a T²SA polymer manufacturing method applied to a reinforced concrete structure and a TGRS (Total Galvanic Repair System) repair reinforcement coating method using the same. About.

In civil engineering and construction, various reinforced concrete structures are subjected to complex influences such as external environmental factors, internal chemical and physical factors, etc. over time.

Corrosion of reinforcing bars in reinforced concrete structures, neutralization or deterioration of concrete occur due to such complex internal and external factors.

Corrosion, neutralization, or deterioration of a reinforced concrete structure reduces the durability of the reinforced concrete structure itself and sharply reduces the stability.

In particular, when a reinforced concrete structure is installed in a marine environment and salt in the seawater penetrates into the concrete, or when calcium chloride used for snow removal in winter penetrates into the concrete of a bridge, the reinforced steel embedded in the concrete is very easily corroded. The corroded reinforcement expands and causes cracks in the concrete.

Reinforced concrete structures including corroded reinforcing bars or cracked concrete may be completely demolished and new structures may be rebuilt. However, too much cost and time have to be put into this. Therefore, it is advantageous in many aspects to go in the direction of maintenance of existing reinforced concrete structures. Reflecting this aspect, reinforcement and repair methods of corroded reinforced concrete structures are currently being generalized, and technology development for construction methods, equipment, or repair materials is actively progressing.

As a related technology, there is Korean Patent Publication No. 10-1222086 (invention name: a construction method using a concrete repair stiffener mixed with an alkanoamine-based multifunctional additive).

The inventor of the present invention came to complete the present invention after long research and trial and error in order to solve these problems.

An embodiment of the present invention provides a rebar protection and concrete structure repair reinforcement coating method that can secure excellent acid resistance.

Meanwhile, other objects not specified of the present invention will be additionally considered within a range that can be easily deduced from the following detailed description and effects thereof.

TGRS repair reinforcement coating method using acid-resistant T²SA polymer mortar according to an embodiment of the present invention includes the steps of chipping and cleaning reinforced concrete structures to be repaired; Removing rust from reinforcing bars in the reinforced concrete structure; Installing a reinforcing material on the reinforced concrete structure; Applying an alkali imparting agent to the reinforced concrete structure; Applying a primer on the reinforced concrete structure to which the alkali imparting agent is applied; And pouring a repair mortar on the primer so that the reinforcing material and the reinforced concrete structure are buried. Including, the step of installing the reinforcing material and the step of applying the alkali-imparting agent may be changed in order, and the repair mortar includes 15 to 45 parts by weight of Tolyltriazole and triazine as an additive for anti-rust performance. A modified T²SA polymer (Tolyltriazole, Triazinetricarboxylic acid-Synthetic Acrylic polymer) synthesized by 20 to 35 parts by weight of triazinetricarboxylic acid and 25 to 45 parts by weight of an acrylic polymer is included, and the T²SA polymer is 15 to 45 parts by weight of Litriazole, 20 to 35 parts by weight of triazine tricarboxylic acid, and 25 to 45 parts by weight of an acrylic polymer are emulsified by synthesizing at 50 to 80°C for 2 hours or more, and the repair mortar is usually Portland cement 30 to 50 parts by weight, 40 to 60 parts by weight of dolomite, 1 to 10 parts by weight of swelling agent, 0.01 to 0.5 parts by weight of dipropylene glycol n-butyl ether (DPNB) as a work performance improver, 1 to 10 parts by weight of T²SA polymer, 0.1 parts by weight of reinforcing fiber ~0.5 parts by weight, fluidizing agent 0.1 to 10 parts by weight, silica fume is mixed in a ratio of 1 to 5 parts by weight, the alkali imparting agent is lithium carbonate (Lithium carbonate) 10 to 30 parts by weight, T²SA polymer 1 to 10 parts by weight, As a work performance improving agent, DPNB is prepared in a liquid form by mixing in a ratio of 0.01 to 0.5 parts by weight and water 50 to 80 parts by weight, and the reinforcement material includes a grid reinforcement material wrapped with glass fiber and aramid fiber in a grid-shaped grid made of carbon fiber. The primer is prepared in a liquid form by mixing 10 to 30 parts by weight of T²SA polymer, 1 to 5 parts by weight of DPNB and 50 to 80 parts by weight of water as a work performance improving agent, and preventing neutralization by salt on the repair mortar. Formula coatings can be applied.

The salt neutralization prevention and heavy anticorrosive coating agent is composed of acrylic polymer, methyl methacrylate (MMA), epoxy and ceramics as main components, and T²SA polymer 1.0 to 10.0 parts by weight and work performance It may contain 5.0 to 10.0 parts by weight of the improving agent DPNB.

The working performance improving agent DPNB may not contain volatile organic compounds (VOCs).

The salt damage neutralization prevention and neutralization coating agent may include a fatty acrylic polymer without impurities.

The salt damage neutralization prevention and neutralization coating agent may use an acid-resistant T²SA polymer mortar, characterized in that it does not contain a volatile organic compound and contains 1.0 to 10.0 parts by weight of a T²SA polymer.

The anti-salt neutralization and anticorrosive coating agents are among acrylic polymer, methylmethacrylate (MMA), epoxy, urethane, ceramics, and poly-urea. It includes at least one and may include 0.1 to 20 parts by weight of the T²SA polymer.

The anti-salting neutralization and anticorrosive coating agent may include an acrylic polymer and 0.1 to 20 parts by weight of the T²SA polymer.

The anti-salting neutralization and anticorrosive coating agent may include methyl methacrylate and 0.1 to 20 parts by weight of the T²SA polymer.

The salt damage neutralization prevention and neutralization coating agent may include an epoxy and 0.1 to 20 parts by weight of the T²SA polymer.

The salt damage neutralization prevention and neutralization coating agent may include urethane and 0.1 to 20 parts by weight of the T²SA polymer.

The salt damage neutralization prevention and neutralization coating agent may include ceramic and may include 0.1 to 20 parts by weight of the T²SA polymer.

The anti-salt neutralization and anticorrosive coating agent may include polyurea and 0.1 to 20 parts by weight of the T²SA polymer.

The present technology can provide a reinforcing coating method for reinforcing reinforcing bars and repairing concrete structures that can secure excellent acid resistance.

1 is a flow chart showing a TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar according to an embodiment of the present invention over time.
2 is a cross-sectional view of a reinforced concrete structure repaired and reinforced by a method according to an embodiment of the present invention.
The accompanying drawings are exemplified by reference for understanding the technical idea of the present invention, and the scope of the present invention is not limited thereto.

In the following, the most preferred embodiment of the present invention will be described. In the drawings, thickness and spacing are expressed for convenience of description, and may be exaggerated compared to actual physical thickness. In describing the present invention, known configurations irrelevant to the gist of the present invention may be omitted. In adding reference numerals to elements of each drawing, it should be noted that only the same elements have the same number as possible, even if they are indicated on different drawings.

1 is a flow chart showing a TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar according to an embodiment of the present invention over time.

Referring to FIG. 1, the TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar according to an embodiment of the present invention includes a chipping and cleaning step, a rust removal step, a reinforcing material installation step, an alkali imparting agent application step, a primer application step, and a repair mortar. It may include a pouring step and a coating agent application step.

In the present invention, the term TGRS is an abbreviation of Total Galvanic Repair System, and is used to mean that the deterioration and durability of concrete structures with reduced durability are repaired to approximate the initial state by chemical action to restore alkalinity and at the same time suppress the aging progress rate. Chemical actions include re-alkalization of neutralized concrete and regeneration of the passive film of reinforcing bars.

First, in the chipping and cleaning step, the reinforced concrete structure to be repaired is chipped and cleaned.

Chipping is to cut and trim damaged sections of reinforced concrete structures such as bridges so that fresh surfaces are exposed to the outside. After chipping the damaged section, clean the section of the concrete with high pressure water to completely remove foreign substances such as concrete debris from the damaged face.

Next, in the rust removal step, rust from the corroded rebar is removed.

Thereafter, in the Hy-Grid installation step, a reinforcement material is installed to reinforce the reinforced concrete structure that has finished chipping and cleaning and rust removal. In the present invention, the term Hy-Grid is a combination of hybrid meaning hybrid and grid meaning grid, and to mean a reinforcing material in the form of a grid formed by mixing and mixing an inner core fiber, an outer covering fiber, and an epoxy resin. Used.

Various types of reinforcing materials exist, but in an embodiment of the present invention, a reinforcing material with a strength reinforcing agent attached thereto is used to enhance the strength of the reinforced concrete structure while enhancing the bonding strength with the repair mortar that is poured into the reinforced concrete structure in a later step. use.

The reinforcing material according to the present invention is attached to the rod by a rod made of carbon fiber and a rod wrapped with glass fibers and aramid fibers, an epoxy resin or acrylic resin adhesive applied to the rod, and a plurality of dolo stones ( dolostone) and quartz sand.

That is, it is possible to increase the strength by including a plurality of dolostone and silica sand, and to increase the bonding strength with the repair mortar to be poured later by including an adhesive such as an epoxy resin or an acrylic resin.

Dolostone generally refers to a calcareous rock containing a significant amount of dolomite (CaMg(CO ₃ ) ₂ ), and is mainly used as a raw material for refractory materials, glass, bricks, and fertilizers. Silica sand is mainly quartz sand, which is accumulated in the form of sand by weathering and depositing rocks. The chemical composition is mainly silica. Such silica sand has a high degree of fire resistance and can improve the fire resistance of concrete.

A mixture of two sizes of dolo stones can be used as a number of dolo stones. That is, one having a diameter in the range of 0.1 to 2 mm and a diameter in the range of 0.05 to 0.1 mm may be mixed and used. This further increases the effect of enhancing the strength of the reinforcing material. If the diameter of the stone stone is less than 0.05mm, the adhesiveness with the repair mortar to be poured later decreases, and if the diameter of the stone stone exceeds 2mm, the adhesive must be used excessively when attaching to the reinforcing material, which is not preferable.

It is preferable that the silica sand used with such a plurality of stone stones has a diameter of 0.1 to 2.0 mm.

In this way, when a reinforcing material is constructed using a plurality of dolostones and silica sands of different sizes, the adhesive strength with the repair mortar to be poured later increases.

After installing the reinforcing material as described above, an alkali imparting rust inhibitor coating step and a primer application step, which are chemical treatment processes, are followed. The present invention is not limited thereto, and the alkali imparting rust inhibitor may be applied before installing the reinforcing material. That is, it is also possible to apply an alkali-applied rust inhibitor to the reinforced concrete structure that has finished rust removal, and then install a reinforcing material.

In the step of applying an alkali imparting agent according to an embodiment of the present invention, an alkali imparting rust inhibitor (Galvashield-NL) is applied to the reinforced concrete structure in which the reinforcing material is installed.

The alkali imparting rust inhibitor is applied to the chipped and cleaned concrete and rust-reinforced reinforcing bars to improve rust prevention. The alkali imparting rust inhibitor restores the alkalinity of concrete by supplying alkali to the neutralized concrete. In addition, an inert film is created on the rebar surface to protect the rebar from corrosion.

Alkali-imparting rust inhibitor according to an embodiment of the present invention is lithium carbonate (Lithium carbonate) 10 to 30 parts by weight, T²SA polymer (Tolyltriazole, Triazinetricarboxylic acid-Synthetic 　Acrylic 　polymer) 1 to 10 parts by weight to be described later, DPNB (dipropylene) glycol n-butyl ether) is prepared in a liquid form by mixing in a ratio of 0.01 to 0.5 parts by weight and 50 to 80 parts by weight of water.

Lithium carbonate can be obtained by adding sodium carbonate or ammonium carbonate to a lithium salt solution. If classified as an alkali metal, it is highly reactive and reacts violently with oxygen, water, and halogen elements. Lithium carbonate according to an embodiment of the present invention imparts alkalinity to the neutralized concrete by using a strong alkali having a pH of 11 or higher, and protects the reinforcing bar from corrosion by improving rust prevention and chloride ion penetration resistance.

The T²SA polymer acts as a rust inhibitor. DPNB, an agent for improving work performance, acts as a film forming agent. A more detailed description of the T²SA polymer and the work performance improving agent DPNB will be described later.

Alkali-impregnated rust inhibitors can penetrate to the optimum depth in concrete only by maintaining an appropriate viscosity. If the appropriate viscosity is maintained, the amount of alkali-imposed rust inhibitor per unit area increases, and the penetration depth increases only when the amount is increased. In an embodiment of the present invention, DPNB, which can maintain viscosity even in an alkaline environment, is used as a work performance improving agent to secure the penetration depth of the alkali imparting rust inhibitor.

Subsequently, in the primer application step according to an embodiment of the present invention, a primer (Galvashield-Primer) is applied to the reinforced concrete structure to which the alkali imparting rust inhibitor is applied.

The primer is laminated on the alkali imparted rust inhibitor, so that the repair mortar to be described later and the concrete are firmly bonded to each other.

The primer may be an epoxy resin concrete adhesive for integrating by pouring new concrete on the surface of an existing reinforced concrete structure.

According to an embodiment of the present invention, the primer may be prepared in a liquid form by mixing 10 to 30 parts by weight of T²SA polymer, 1 to 5 parts by weight of DPNB and 50 to 80 parts by weight of water as a work performance improving agent.

The T²SA polymer added to the primer improves chloride ion penetration and rust prevention. DPNB, a work performance improver, improves viscosity and improves adhesion to concrete. A more detailed description of the T²SA polymer and the work performance improving agent DPNB will be described later.

Thereafter, in the step of pouring the repair mortar, a repair mortar (Galvashield-Plaster) is poured on the primer so that the reinforcement and reinforced concrete structures are buried.

The repair mortar must ensure rust prevention, strength and adhesion to concrete.

Thus, the repair mortar according to an embodiment of the present invention is a rust-preventing additive, 15 to 45 parts by weight of Tolyltriazole, 20 to 35 parts by weight of triazinetricarboxylic acid, and an acrylic polymer (Acrylic polymer) 25 to 45 parts by weight of the synthesized modified T²SA polymer (Tolyltriazole, Triazinetricarboxylic acid-Synthetic Acrylic polymer) is included. T²SA polymer is included in the repair mortar, which can improve rust prevention and chloride ion penetration resistance.

Hereinafter, the configuration of the repair mortar according to an embodiment of the present invention will be described in more detail.

The repair mortar according to an embodiment of the present invention usually includes Portland cement, dolomite, an expanding agent, a work performance improving agent, a T²SA polymer, a reinforcing fiber, a fluidizing agent, and a silica fume. Specifically, 30 to 50 parts by weight of normal Portland cement, 40 to 60 parts by weight of dolomite, 1 to 10 parts by weight of an expanding agent, 0.01 to 0.5 parts by weight of DPNB as a work performance improving agent, 1 to 10 parts by weight of T²SA polymer, 0.1 to 0.5 parts by weight of reinforcing fibers It is mixed in a ratio of 0.1 to 10 parts by weight of a fluidizing agent and 1 to 5 parts by weight of silica fume.

Portland cement is usually powdered by mixing raw materials including silica, aluminum, iron oxide and lime as the main components in an appropriate ratio and adding an appropriate amount of gypsum to the clinker obtained by firing it. It is not limited thereto, and other types of cement may be used. Dolomite improves fire resistance. The expansion agent compensates for mid- to long-term contraction, reduces drying contraction, and suppresses cracking. The reinforcing fibers increase the bonding strength between concrete structures to prevent cracking of the repair mortar, as well as increase resistance to external impact, abrasion, corrosion, and deterioration factors such as freeze. The fluidizing agent is a raw material for improving the pumping performance of repair mortar and improving workability and maintaining workability in summer. Silica fume is used to increase strength. Description of DPNB and T²SA polymers are as follows.

T²SA polymer is an emulsion by synthesizing 15 to 45 parts by weight of tolitrizol, 20 to 35 parts by weight of triazine tricarboxylic acid, and 25 to 45 parts by weight of an acrylic polymer at 70°C for 4 hours or more and 50 to 80°C for 2 hours or more. It is a modified T²SA polymer formed by conversion.

Let's look at it in more detail.

Tolithriazole is a metal non-active agent soluble in water or glycol. It is excellent in preventing corrosion of gold (copper, aluminum) and cobalt alloy. For example, you can use the SINOCOR TME720 product.

The chemical formula of tolithriazole is as follows.

The mechanisms for preventing the corrosion of copper to ammonia in tolitrizol are well known.

Triazine tricarboxylic acid is a water-soluble anti-rust additive. It does not form a resin film on the metal, generates less bubbles, and does not cause spots on aluminum. It has excellent compatibility with hard water and can be used as a rust inhibitor additive for various metal systems. It is a very effective anti-rust additive for cast iron, steel, and aluminum. For example, the product TAT 730/736/738 can be used.

The chemical formula of triazine tricarboxylic acid is as follows.

The acrylic polymer is a generic term for a high molecular compound mainly including acrylic acid, methacrylic acid and derivatives thereof, such as acrylamide and acrylonitrile. It has excellent transparency, good oil resistance and weather resistance, but lacks chemical resistance. It is used for textiles, paints, adhesives, and rubber. It is a water-oxidized form of acrylic resin and is generally used for cement-related concrete and mortar. The acrylic polymer according to an embodiment of the present invention may be a water-based acrylic polymer emulsion.

By adding such a T²SA polymer to the repair mortar, the T²SA polymer forms a film on the concrete surface, thereby preventing the penetration of chloride ions into the reinforced concrete, thereby improving the rust prevention of reinforced concrete.

Table 1 below shows the results of the T²SA polymer emulsification according to the appropriate polymerization temperature and time, that is, the compatibility test results with cement (mortar).

Polymerization temperature and time 0℃ 10℃ 20℃ 30℃ 40℃ 50℃ 60℃ 70℃ 80℃ 90℃ 100℃ 110℃ 120℃ 60 minutes 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 120 minutes 0% 10% 30% 40% 50% 60% 70% 90% 95% 95% 95% 90% 80% 180 minutes 0% 20% 30% 40% 50% 60% 70% 90% 95% 95% 95% 95% 80% 240 minutes 0% 20% 30% 45% 50% 60% 70% 95% 95% 95% 95% 95% 90% 300 minutes 0% 25% 35% 45% 55% 65% 70% 95% 100% 100% 95% 90% 80% 360 minutes 0% 25% 35% 45% 55% 65% 75% 100% 100% 95% 95% 90% 80% 420 minutes 0% 25% 35% 45% 55% 65% 75% 100% 95% 95% 95% 90% 80% 480 minutes 0% 25% 35% 45% 55% 65% 75% 100% 95% 95% 95% 90% 80% 540 minutes 0% 25% 35% 45% 55% 65% 75% 100% 95% 95% 95% 90% 80%

Sedimentation rate =100%-Result sedimentation rate=(precipitate/T²SA)*100%

As can be seen in Table 1, it can be seen that the water mixing ratio (mixing ratio with mortar) increases as the reaction temperature increases, and then decreases again starting at a specific temperature. That is, it can be seen that there is an appropriate reaction temperature that is advantageous for emulsifying the T²SA polymer.

In addition, referring to Table 1, it can be seen that the mixing ratio of T²SA polymer with water increases as the reaction time increases, and there is no significant change after reaching a predetermined time. For example, when the reaction time reaches 6 to 7 hours, there is no significant change in the mixing ratio before and after.

The mixing ratio of the T²SA polymer with water is the highest when reacting at 70℃ for 4 hours or more, 95-100%. In particular, when reacted at 70° C. for 6 hours or more, the mixing ratio starts to show 100%. It can be seen that the higher the mixing ratio, the better the emulsification of the T²SA polymer is.

Table 2 shows the adhesion performance test results according to the appropriate polymerization temperature and time of the T²SA polymer. Specifically, depending on the reaction time and the reaction temperature, tolytriazole, triazine tricarboxylic acid, and acrylic polymer are polymerized to form a T²SA polymer, and then the T²SA polymer is included in the entire repair mortar in a ratio of 5.0 parts by weight, It shows the results of the adhesion strength test according to the KS F 4042 standard test method.

Adhesion strength (kg/cm2) Reaction temperature / time 50℃ 70℃ 90℃ 110℃ 180 minutes 0.8 1.6 1.6 1.2 240 minutes 1.2 1.8 1.8 1.5 300 minutes 1.2 1.8 1.8 2.0 360 minutes 1.5 2.0 2.0 2.0 420 minutes 1.5 1.5 1.8 1.5

As can be seen in Table 2, as the reaction temperature of the T²SA polymer increases, the adhesion strength of the repair mortar tends to increase, but after 90°C, the adhesion strength of the repair mortar tends to increase or decrease. Similarly, the reaction time of the T²SA polymer increases As the increase increases, the adhesion strength of the repair mortar increases, and then decreases overall when reaching a certain time. Roughly, when reaching 7 hours, the adhesion strength tends to decrease.

The highest adhesion strength begins to appear in the T²SA polymer synthesized at 70℃ for 6 hours. The highest adhesion strength is also found in the T²SA polymer synthesized at 90°C for 6 hours or the T²SA polymer synthesized at 110°C for 5 hours, but the higher the synthesis temperature, the more disadvantageous in terms of time and cost of the manufacturing process.

By adding the T²SA polymer formed by this synthetic reaction to the repair mortar, the quality of the repair mortar can be improved by increasing the adhesion strength of the repair mortar.

DPNB working performance improving agent is a low evaporation hydrophobic glycol ether that has excellent coagulation characteristics while lowering the surface tension as a film forming agent. One of the most efficient combinations in the aqueous latex system, it is a solvent that evaporates relatively slowly and has excellent compatibility with various resins. Not only does it provide excellent surface tension reduction, it is also useful for cleaning products by mixing with other glycol ether products or by itself. It is eco-friendly and is LOW VOC (Volatile Organic Compounds). For example, you can use the DOWANOL ^TM DPnB product.

The formula of DPNB is as follows.

Table 3 below shows the results of improved flame resistance and seawater resistance, as well as improved thixotropy and rebound rate by including T²SA polymer and DPNB work performance improving agent in the repair mortar.

division Raw material / performance Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Remark combination cement 46.70% 41.00% 41.00% 41.00% 41.00% 41.00% Stone Stone 51% 54.60% 53.50% 51.45% 50.90% 50.35% T²SA polymer 0.00% 2.00% 3.00% 5.00% 5.50% 6.00% Silica fume 1.60% 1.60% 1.60% 1.60% 1.60% 1.60% Fluidizing agent 0.50% 0.50% 0.50% 0.50% 0.50% 0.50% Reinforcing fiber 0.20% 0.20% 0.20% 0.20% 0.20% 0.20% Work performance improvement system (DPNB) 0.00% 0.10% 0.20% 0.25% 0.30% 0.35% system 100.00% 100.00% 100.00% 100.00% 100.00% 100.00% Initial conclusion (hour:minute) 4:40 4:15 4:55 3:35 2:50 3:20 Termination (hour:minute) 7:20 6:25 5:45 5:20 4:15 4:30 Working time (hour:minute) 0:45 0:15 0:20 0:30 0:15 0:15 Compressive strength (N/㎟) 53.4 58 59.6 65.8 62.2 64.4 Whip strength (N/㎟) 9 9.2 9.6 9.8 10 9.4 Alkali resistance (N/㎟) 45.3 49.4 48.4 49.4 48.4 48.4 Neutralization resistance (mm) 5.2 3.5 2.2 1.9 1.9 1.9 T²SA effect Water permeability (g) 2 1.5 0.9 0.8 0.8 0.8 T²SA effect Water absorption coefficient (kg/(m2.h0.5) 0.2 0.15 0.08 0.03 0.02 0.02 T²SA effect Moisture permeation resistance (m) 0.5 0.7 0.6 0.7 0.8 0.7 T²SA effect Bond strength under standard conditions (N/㎟) 0.8 One 1.5 1.8 1.8 1.8 T²SA effect Adhesion strength after repeated heating/cooling (N/㎟) 1.4 1.3 1.4 1.6 1.6 1.6 Chloride ion penetration resistance (coulomb) 1250 750 642 592 580 584 Triazine tricarboxylic acid effect Length change rate 0.002 -0.002 -0.001 -0.002 0.001 -0.002 Rust prevention rate (%) 65.5 71.4 88.4 98.5 97.4 98.4 T²SA effect Test content Plastering workability Flow down
(can not be used) Flow down
(can not be used) Good Very good Very good
(No change with sample 4) Viscous excess (not available) DPNB effect Rebound rate
(%) 25% 19% 16% 5% 10% Viscous excess (not available) DPNB effect

Here, the rebound rate refers to the rate at which mortar is dropped and lost when sprayed on the top using equipment, and the lower the better. Since the loss is discarded, the lower the rebound rate is, the more economical it is and it is eco-friendly because it can reduce waste. For each sample, the flexural strength, compressive strength, adhesion strength, alkali resistance, neutralization resistance, water permeability, water absorption coefficient, moisture permeation resistance, chloride ion penetration resistance, and length change rate were measured by the KS F 4042 standard test method.

Referring to Table 3, as the content of the T²SA polymer in the total repair mortar increases, chloride ion penetration resistance improves. Specifically, when the content of the T²SA polymer in the total repair mortar is 3 parts by weight or more, it exhibits a low chloride ion penetration resistance of 600 units (see Sample 3). In addition, when the T²SA polymer occupies 5 parts by weight or more in the total repair mortar, it exhibits 500 chloride ion penetration resistance (see Samples 4, 5 and 6).

However, if the content of the T²SA polymer in the total repair mortar is 6.0 parts by weight or more, the effect is the same or rather reduced, so that overuse of the T²SA polymer may be disadvantageous in terms of economics.

Therefore, when the proportion of T²SA polymer in the total repair mortar is 3 or more and less than 6 parts by weight, chloride ion penetration resistance is measured as low as 580 to 642 coulombs, and the rust prevention rate is 88.4% to 98.5%, which is a very high rust prevention rate. It can be seen that it represents.

When DPNB work performance improving agent is included in the proportion of parts by weight of 0.20 or more and less than 0.35 in the whole repair mortar, the runoff during plastering is greatly reduced, resulting in good or very good plastering workability. If the content of DPNB work performance improving agent is less than 0.20 parts by weight, it is not possible to use repair mortar due to severe runoff during plastering, and if it is more than 0.35 parts by weight, repair mortar cannot be used likewise due to excess viscous fibers.

When the content of T²SA polymer and DPNB work performance improving agent are within the above range, the rabound rate at the time of spraying the repair mortar is also measured as low as 5-16%. In other words, it is economically very advantageous because there is little loss of repair mortar due to rebound within the above range.

More preferably, the repair mortar according to an embodiment of the present invention is usually Portland cement 42 parts by weight, dolomite 51.45 parts by weight, T²SA polymer 5.0 parts by weight, silica fume 1.6 parts by weight, fluidizing agent 0.5 parts by weight, reinforcing fiber 0.2, DPNB It may be mixed in a ratio of 0.25 parts by weight of the work performance improving agent. Sample 4 of Table 3 shows the formulation of the repair mortar according to an embodiment of the present invention.

As can be seen from Table 3, when 5.0 parts by weight of T²SA polymer is included in the repair mortar, the compressive strength is 65.8 (N/mm2) and the alkali resistance is 49.4 (N/mm2), which is the highest, and chloride ion penetration resistance. This leads to very low with 592 (Coulomb). In addition, the rust prevention rate is also the highest at 98.5%, showing almost perfect rust prevention rate. In addition, the neutralization resistance is the lowest at 1.9 (mm), the water permeability is the lowest at 0.8 (g), and the water absorption coefficient is also relatively good at 0.03 (kg/(m2.h0.5)). , Moisture permeation resistance is 0.7(m), which shows a very good value, and the adhesion strength under standard conditions and the adhesion strength after repeated hot/cooling are 1.8 (N/㎟) and 1.6 (N/㎟), respectively.

In addition, when 0.25 parts by weight of DPNB work performance improving agent is included in the repair mortar, the workability (thixotropy) is very good due to reduced runoff during plastering. The rebound rate is the smallest as 5% when spraying with the repair mortar, so the loss is small. Workability is also the best.

As a result, according to the repair mortar according to an embodiment of the present invention, the compressive strength is greatly improved, alkali resistance and chloride ion penetration resistance are excellent, so that the rust prevention rate is excellent. In addition, it is excellent in neutralization resistance, water permeability, water absorption coefficient, moisture permeation resistance, and adhesion strength, and has excellent workability and low loss, which is economical. Therefore, in protecting reinforcing bars and repairing and reinforcing concrete structures, it exhibits excellent performance in terms of flame resistance and seawater resistance compared to the existing repair mortar, and has an improved effect in terms of workability and economy.

Table 4 below is a table comparing the performance of the repair mortar (Sample 4) and the standard mortar according to an embodiment of the present invention.

Performance Invention mortar
(Sample 4) Standard mortar Remark Initial decision 3:35 4:15 closing 5:20 6:20 working time 0:30 0:15 Compressive strength (N/㎟) 65.8 20.4 T²SA polymer effect Whip strength (N/㎟) 9.8 5 T²SA polymer effect Alkali resistance (N/㎟) 49.4 20.8 T²SA polymer effect Neutralization resistance (mm) 1.9 5.6 T²SA polymer effect Water permeability (g) 0.8 2.8 T²SA polymer effect Water absorption coefficient (kg/(m2.h0.5) 0.03 1.4 T²SA polymer effect Moisture permeation resistance (m) 0.7 1.8 T²SA polymer effect Bond strength under standard conditions (N/㎟) 1.8 0.25 T²SA polymer effect Adhesion strength after repeated heating/cooling (N/㎟) 1.6 0.2 T²SA polymer effect Chloride ion penetration resistance (coulomb) 592 4350 Triazine tricarboxylic acid effect Length change rate -0.002 -0.015 Rust prevention rate (%) 98.5 65 T²SA polymer effect Plastering workability Very good Very good (no change from sample 4) DPNB
Work performance improvement agent effect Rebound rate (%) 5% 10% DPNB work performance improvement agent effect

Referring to Table 4 above, it can be seen that the repair mortar according to an embodiment of the present invention has superior rust prevention and economy compared to the standard mortar. Table 5 below is a table comparing the performance of the repair mortar (Sample 4 above) and the standard mortar according to an embodiment of the present invention.

Performance Invention mortar
(Sample 4) Standard mortar Appearance condition After standard curing
After accelerated weathering test
After repeated hot and cold test
After alkali resistance test
After salt water resistance test clear Fine cracking, discoloration, and surface latency Neutralization depth (mm) 1.9 5.8 Chloride ion penetration resistance (coulomb) 592 2,200 Moisture permeability (g/m2.day) 32 380 Water permeability Not pitched Pitched Compression strength ratio
(Acid resistance) Compressive strength ratio (Sulfuric acid immersion test (5% sulfuric acid aqueous solution) 30 days) 105% 81% Compressive strength ratio (seawater immersion test (seawater 100%) 30 days) 98% 72%

Referring to Table 5, it can be seen that the repair mortar to which the construction method according to an embodiment of the present invention is applied maintains its initial appearance well after curing and after various performance tests. In the standard mortar to which the method of the present invention was not applied, fine cracking, discoloration, and surface latency phenomena occurred. The repair mortar to which the construction method according to an embodiment of the present invention is applied shows very superior characteristics than the standard mortar in terms of neutralization depth, chloride ion penetration resistance, moisture permeability, and water permeability. In the sulfuric acid immersion test and seawater immersion test results, the repair mortar to which the method according to an embodiment of the present invention is applied maintains a compressive strength ratio of 98 to 105%, so it is only 72 to 81% compared to the standard mortar with reduced compressive strength. It shows excellent results.

After pouring the repair mortar, it prevents salt damage and neutralization and coats a heavy-duty coating (Acrylic, Utrthane, Epoxy, MMA, Ceramic, Poly-Urea) on the repair mortar to repair reinforced concrete structures This can be done.

The anti-salt neutralization and heavy anticorrosive coating agent may be an aqueous protective coating having elasticity mainly composed of a fatty acrylic polymer without impurities. Salt damage neutralization prevention and heavy anticorrosive coating agent is LOW VOC (Volatile　Organic　Compounds, volatile organic compounds).

According to an embodiment of the present invention, the anti-salt neutralization and anticorrosive coating agents include acrylic polymer, methyl methacrylate (MMA), epoxy, urethane, ceramics, and At least one of poly-urea may be used as a main component and 0.1 to 20 parts by weight of the T²SA polymer may be included.

For example, the anti-salt neutralization and anticorrosive coating agent may include an acrylic polymer as a main component and 0.1 to 20 parts by weight of the T²SA polymer. Alternatively, the coating agent may contain methyl methacrylate as a main component and 0.1 to 20 parts by weight of the T²SA polymer. Alternatively, the coating agent may contain an epoxy as a main component and 0.1 to 20 parts by weight of the T²SA polymer. Alternatively, the coating agent may contain urethane as a main component and 0.1 to 20 parts by weight of the T²SA polymer. Alternatively, the coating agent may include ceramic as a main component and 0.1 to 20 parts by weight of the T²SA polymer. Alternatively, the coating agent may contain polyurea as a main component and 0.1 to 20 parts by weight of the T²SA polymer.

Reinforced concrete structures exposed to the atmosphere may be contaminated from acid gas, chlorine ions, oxygen, and water, and cracks may occur. By applying the above-described coating agent to the reinforced concrete surface, contamination can be prevented and cracks can be prevented.

At this time, the acrylic polymer minimizes dust deposition to prevent contamination, and does not interfere with the curing of concrete by enabling water vapor evaporation from the reinforced concrete structure. . Similar effects can be expected by using methyl methacrylate, epoxy, urethane, ceramic or polyurea instead of acrylic polymer.

As described above, the reinforcing bar protection and concrete structure repair reinforcement coating method according to an embodiment of the present invention is completed by coating the salt damage neutralization prevention and heavy corrosion protection coating agent on the repair mortar.

2 is a cross-sectional view of a reinforced concrete structure repaired and reinforced according to the construction method according to an embodiment of the present invention.

Referring to Figure 2, there is a reinforced concrete composed of reinforced reinforcement 10 and concrete 20. A reinforcement material 40 for reinforcement is installed in the reinforced concrete structure, an alkali imparting rust inhibitor 50 and a primer 60 are applied on the concrete, and the repair mortar 30 fills the remaining space. In addition, on the surface of the repair mortar, a neutralization prevention and heavy anticorrosive coating agent 70 is applied. These materials are manufactured directly by the applicant.

As described above, in the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , If a person of ordinary skill in the field to which the present invention belongs, various modifications and variations are possible from this description. Therefore, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things that are equivalent or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. .

Claims (12)

Chipping and cleaning reinforced concrete structures to be repaired;
Removing rust from reinforcing bars in the reinforced concrete structure;
Installing a reinforcing material on the reinforced concrete structure;
Applying an alkali imparting agent to the reinforced concrete structure;
Applying a primer on the reinforced concrete structure to which the alkali imparting agent is applied; And
Pouring a repair mortar on the primer so that the reinforcing material and the reinforced concrete structure are buried; Including,
The step of installing the reinforcing material and the step of applying the alkali-imparting agent may be changed in order with each other,
In the repair mortar, 15 to 45 parts by weight of tolyltriazole, 20 to 35 parts by weight of triazinetricarboxylic acid, and 25 to 45 parts by weight of an acrylic polymer are synthesized as an anticorrosive additive. Modified T²SA polymer (Tolyltriazole, Triazinetricarboxylic acid- Synthetic Acrylic polymer) is included,
The T²SA polymer is emulsified by synthesizing 15 to 45 parts by weight of the tolytriazole, 20 to 35 parts by weight of triazine tricarboxylic acid, and 25 to 45 parts by weight of an acrylic polymer at 50 to 80°C for 2 hours or more,
The repair mortar is usually 30 to 50 parts by weight of Portland cement, 40 to 60 parts by weight of dolomite, 1 to 10 parts by weight of an expanding agent, 0.01 to 0.5 parts by weight of DPNB (dipropylene glycol n-butyl ether) as a work performance improving agent, T²SA polymer 1 ~10 parts by weight, 0.1 to 0.5 parts by weight of reinforcing fibers, 0.1 to 10 parts by weight of a fluidizing agent, and 1 to 5 parts by weight of silica fume are mixed,
The alkalinating agent is prepared in a liquid form by mixing 10 to 30 parts by weight of lithium carbonate, 1 to 10 parts by weight of T²SA polymer, 0.01 to 0.5 parts by weight of DPNB and 50 to 80 parts by weight of water as a work performance improving agent. ,
The reinforcing material comprises a grid reinforcement material wrapped with glass fibers and aramid fibers in a grid-shaped grid made of carbon fibers,
The primer is prepared in a liquid form by mixing 10 to 30 parts by weight of T²SA polymer, 1 to 5 parts by weight of DPNB and 50 to 80 parts by weight of water as a work performance improving agent,
TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar, characterized in that applying a neutralization and neutralization coating agent on the repair mortar. The method of claim 1,
The anti-salt neutralization and anti-corrosive coating agents include acrylic polymer, methyl methacrylate (MMA), epoxy and ceramics, and 1.0 to 10.0 parts by weight of T²SA polymer and work performance improving agent TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar, characterized in that it contains 5.0 to 10.0 parts by weight of DPNB. The method of claim 1,
The work performance improving agent DPNB is characterized in that it does not contain volatile organic compounds (Volatile Organic Compounds, VOCs), TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, characterized in that it contains a fatty acrylic polymer without impurities, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent does not contain volatile organic compounds and contains 1.0 to 10.0 parts by weight of T²SA polymer, TGRS repair reinforcement coating method using acid-resistant T²SA polymer mortar. The method of claim 1,
The anti-salt neutralization and anticorrosive coating agents are among acrylic polymer, methylmethacrylate (MMA), epoxy, urethane, ceramics, and poly-urea. TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar, characterized in that it contains at least one and contains 0.1 to 20 parts by weight of the T²SA polymer. The method of claim 1,
The anti-salt neutralization and anticorrosive coating agent, comprising an acrylic polymer and 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, comprising methyl methacrylate and 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, comprising an epoxy and 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, comprising urethane and 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, comprising a ceramic and comprising 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar. The method of claim 1,
The salt damage neutralization prevention and heavy anticorrosive coating agent, comprising a polyurea and 0.1 to 20 parts by weight of the T²SA polymer, TGRS repair reinforcement coating method using an acid-resistant T²SA polymer mortar.

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