KR100879779B1 - Cathodic protection repair method of concrete structure using zinc sacrificial anode and mortar for coating zinc sacrificial anode - Google Patents

Abstract

A reinforced concrete structure repairing/reinforcing method is provided to present keeping method about corrosion of long-dated steel reinforcement and to repair concrete structure and to watch the corrosion of long-dated steel reinforcement by naked eye. A reinforced concrete structure repairing/reinforcing method comprises steps of: chipping object reinforced concrete structure(CS); washing the chipped reinforced concrete structure using high pressure water; removing rust of the corrosion steel reinforcement(RS) of the washed part; setting up a sacrifice assembly(SA) in the corrosion steel reinforcement and a junction box(JB) and a corrosion current measuring apparatus; coating alkali granting in the sacrifice assembly; coating a primer on coated alkali granting agent; coating an anti-rust mortar(RM) on the coated primer; coating a neutralization preventing agent on the anti-rust mortar; and receiving and watching content sending from the corrosion current measuring apparatus.

Description

Anti-corrosive mortar with coating of self-sacrificing electrode and cross-sectional recovery and reinforcement of reinforced concrete structure using it {Cathodic protection repair method of concrete structure using zinc sacrificial anode and mortar for coating zinc sacrificial anode}

The present invention relates to anti-corrosive mortar having a self-sacrificial electrode coating and cross-sectional recovery, and a repair and reinforcement method for reinforced concrete structures using the same. The present invention relates to a rust preventive mortar having a coating and cross-sectional recovery of a self-sacrificing electrode capable of suppressing corrosion of iron and a method of repairing and reinforcing reinforced concrete structures using the same (aka TGRS (Total galvanic Repair System)).

Bridges, tunnels, subways, underground roadways, covered structures, and other civil and building reinforced concrete structures deteriorate over time, shortening their lifespan.

Such deterioration of the concrete structure is affected by the quality of the concrete and steel used, environmental factors, physical factors, etc., in particular due to the corrosion of the steel reinforcement embedded in the concrete.

In particular, when concrete structures are located in the marine environment, when salt in seawater penetrates into concrete or calcium chloride used for snow removal in winter penetrates into concrete, the steel reinforcement embedded in concrete is likely to corrode. Expands and causes fine cracks in the concrete.

The microcracks formed as described above extend to the surface of the concrete structure, and outside air or moisture further penetrates into the concrete through cracks extending to the surface of the concrete structure, thereby further facilitating the dropping, peeling, and corrosion of the internal reinforcing concrete.

In addition, the salt penetrates into the concrete to neutralize the concrete by reacting with the lime hydroxide in the concrete having a high alkali content of the initial pH 12 to 13 to produce lime carbonate.

Various methods have been developed to prevent corrosion of the internal steel reinforcing bars and to recover the dropped concrete sections.

One method is to recover the dropped concrete sections with repair mortar.

However, in the case of repairing in this way, the salt penetrated into the concrete is not completely removed, causing corrosion of the reinforcing steel and easily repairing the repaired part, or in the case of partial repairing, the content of chloride Cl-ion in the repaired part and the unrepaired surroundings. There is a problem that corrosion is accelerated where Cl-ion content is low due to the potential difference of the initial cathode effect due to the difference in the Cl- ion content.

Here, the self-sacrificing assembly can stop the initial cathode effect by using a galvanic cathode, thereby eliminating the potential difference of the basic rebar, thereby preventing the ring effect of corrosion occurring in the adjacent part again.

However, the lifetime is determined by the amount of zinc in the interior, and the only way to increase the lifetime is to increase the amount of zinc.

In addition, the existing monitoring method is a disadvantage that must be directly confirmed to the installation structure, it was often difficult to identify directly, such as military areas, coastal bridges and sewage culverts.

As another method, it is known to perform external power protection (Cathodic protection) using a titanium anode network or a conductive surface coating material.

This method can prevent corrosion of reinforcing steel even when salt is present in concrete, but it is not only complicated in construction but also expensive in anode material, and has to be supplied from outside, which is complicated and expensive to maintain. There are disadvantages.

Therefore, the present invention has been devised to solve the problems described above, by installing a self-sacrificing assembly that can act directly on the reinforcing bar, rust prevented directly on the reinforcing bar in the damage site and anticipated corrosion of the rebar corrosion site And the cross-sectional recovery with anti-corrosive mortar that combines self-sacrificing electrode coating and cross-sectional recovery to protect the double anti-rust effect and self-sacrificing assembly from chloride ions. The purpose of the present invention is to provide a self-sacrificing assembly coating and cross-sectional recovery anti-rust mortar and method for repairing and reinforcing reinforced concrete structures using the same.

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention for achieving the above object; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 parts by weight of a natural water-soluble polysaccharude thickener; 0.5 parts by weight of a polycarboxyrate fluidizing agent; 6 parts by weight of ultra-fine pozzolanic powder of 0.5 μm or less of any one of nano-silica, waste lime and diatomite, or a mixture of two or more thereof; 3 parts by weight of a rust preventive agent comprising 2 parts by weight of modified fluoroalkylsilane, 0.5 parts by weight of modified silane polymer acryl and 0.5 parts by weight of modified amino silane; 0.02 parts by weight of hydrozinium surphate and 0.02 parts by weight of polysaccharide.

In addition, the reinforcement concrete structure repair and reinforcement method using the anti-corrosive mortar combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention for achieving the above object comprises the steps of: chipping the target reinforced concrete structure; Washing the chipped reinforced concrete structure with high pressure water; Removing rust of the corroded steel of the cleaned portion; Installing a self-sacrificing assembly, a junction box, and a corrosion current measuring device in the corroded rebar; Applying an alkali grant agent to the self-sacrificing assembly; Applying a primer on the applied alkalizing agent; Applying anti-rust mortar, which serves as both a coating of the self-immolative electrode and cross-sectional recovery on the applied primer; Coating an anti-neutralizing agent on the anti-rust mortar that serves as a coating and cross-sectional recovery of the self-immolative electrode; The self-sacrificing assembly comprises a step of wirelessly receiving and monitoring the contents sent from the corrosion current measuring device.

As described above, the anti-corrosive mortar having both the coating and the cross-sectional recovery of the self-sacrificing electrode according to the present invention, and the reinforcement concrete structure repairing and reinforcing method using the same, install a self-sacrificing assembly which can act directly on the rebar, Anti-corrosion is applied directly to the rebar on the damaged part and anticipated corrosion, and the cross-sectional recovery is performed with anti-corrosive mortar that combines self-sacrificing electrode coating and cross-sectional recovery to protect the double anti-rust effect and self-sacrificing assembly from chloride ions. Self-sacrificing assembly coating and cross-sectional recovery anti-rust mortar for suggesting the maintenance method for the corrosion of reinforcing steel as well as the concrete structure for the long-term reinforcement, and providing the repair and reinforcing method of reinforced concrete structure using the same There is this.

Hereinafter, the present invention will be described in detail.

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 parts by weight of a natural water-soluble polysaccharude thickener; 0.5 parts by weight of a polycarboxyrate fluidizing agent; 6 parts by weight of ultra-fine pozzolanic powder of 0.5 μm or less of any one of nano-silica, waste lime and diatomite, or a mixture of two or more thereof; 3 parts by weight of a rust preventive agent comprising 2 parts by weight of modified fluoroalkylsilane, 0.5 parts by weight of modified silane polymer acryl and 0.5 parts by weight of modified amino silane; It is composed of 0.04 parts by weight of work improving agent consisting of 0.02 parts by weight of hydrozinium surphate and 0.02 parts by weight of polysaccharide.

That is, anti-corrosive mortar, which combines the self-sacrificial electrode coating and cross-sectional recovery according to the present invention, increases hydrophobicity of mortar and forms a passive film directly on rebar through modified fluoroalkylsilanes or modified silane polymer acrylics or amino silanes. It is a mortar that is applied to maintenance reinforcement which improves the mortar's rust prevention performance and improves chloride ion penetration resistance by doubling the density of mortar with powder and polycarboxylic acid-based fluidizing agent.

Here, the cement is usually composed of portland cement.

In addition, the silica sand uses a purity of 98% or more as silicon oxide of SiO or SiO ₂ white quartz as silicon oxide.

The shrinkage compensator is composed of calcium sulfoaluminate (CSA), and the calcium sulfoaluminate compensates for medium and long term shrinkage, and reduces dry shrinkage and cracks.

Shrinkage compensation material is preferably calcium sulfo aluminate (CSA: Calcium Sulfo Aruminate), calcium oxide (CaO) -based expandable inorganic mixture or mixtures thereof.

In particular, the addition of CSA increases the number of chemical bonds by the hydration reaction and produces a needle crystal called Ettringite, which is formed by the hydration reaction (3CaO, Al ₂ O ₃ , 32H ₂ O). Is a very small crystal of several micros. In the process of cement paste hardening, colloidal fine pores between the gels are foamed into the needles, and the voids are reduced as the gel is cured. It works.

In addition, CSA produces ettringite-like needle crystals, which expand the inorganic swelling agent during hydration, expands in volume, tensions the reinforcing bars in the concrete by expansion pressure, and introduces a compressive stress into the concrete. To increase the tensile strength of the structure.

In addition, by filling the micropores in the concrete by the expansion action of the expanding agent to form a stable and dense structure in the long-term, it is effective in improving the water-tightness of concrete and stable strength.

In addition, when the hydration heat inhibiting expansion agent CSA 100R is mixed with ordinary portland cement, it exhibits a hydration rate similar to that of a medium heat portland cement, and suppresses the increase of hydration heat even in a large amount of cast concrete.

In addition, the swelling agent is a pulverized compound (Calcium Sulfo Aruminate) mainly composed of lime, gypsum, and bauxite in a process with a proper particle size (Hauyne, 3CaO, 3Al ₂ O ₃ , CaSO ₄ ), glass lime (CaO). ), Glass gypsum (CaSO ₄ ) is composed of minerals.

On the other hand, hydrozinium sulphate or Cupric carbonate is a non-metallic gas expanding agent that meets each other with water to expand the gas to form micro-pores in the mortar after mixing to improve spray pumping performance.

In addition, the polymer is an EVA polymer-modified acrylic polymer prepared by copolymerizing ethylene vinyl acetate on the basis of vinyl ester, and acting to improve the flowability of mortar by the ball bearing effect and the film formation of the polymer particles. By improving the adhesion performance with the existing concrete by increasing the viscosity of not only to increase the bending strength and the surface hardness of the mortar, but also to prevent the corrosion of the reinforcing bar after repairing because it has an anti-corrosion effect by the film formation.

The reinforcing fiber is Homopolymer Polypropylene, and PP fiber, a fiber reinforcing material, distributes more than 8.5 million fibers in 1m3 of mortar irregularly to increase the bonding strength between concrete structures, thereby preventing mortar cracking and external impact, abrasion, corrosion and Increases resistance to deterioration factors such as the East Sea, suppresses shrinkage (hardening / drying) cracks of concrete / mortar, increases resistance to abrasion and erosion, increases resistance to impact and breakage, increases resistance to freeze-thawing, and permeability It has the effect of increasing the hardness and increasing the resistance due to the decrease, the reduction of reinforcing bar corrosion, fatigue and cyclic load.

In addition, the thickener is a viscosity enhancer for increasing thixotropic properties, which is reduced by using a polycarboxylic acid-based fluidizing agent, which is a high-performance fluidizing agent. It serves to complement.

In addition, the wellan gum, which improves the performance of plaster and spray work according to the thixotropic performance of mortar, is a kind of natural water-soluble polysaccharude. Although the viscosity is slightly high in alkaline solution, the concentration of calcium and pH affect the viscosity of wellan gum solution. Do not give.

Applying an appropriate amount of wellan gum to concrete gives fluidity in less space of self-consolidated concrete. It also provides long-term stability and improves self-consolidation over large areas of slump-flow.

The effect of wellan gum has been proved in the narrow space test such as slump flow test, V type funnel test and U type casting test.It maintains homogeneity in working and setting, does not bubble, smooth flow and smooth It has a flat and flat surface and a constant hardening characteristic.

Wellan gum in particular gives some viscosity without depending on calcium content or pH. This property is unique and is not found in the cellulose of the Derivatives and Polyacrylate viscous bases.

In addition, when wellan gum meets water and becomes a solution in mortar, the viscosity is substantially unchanged in the range of 5-30 ° C.

This property is one of the reasons that the slump flow of self-consolidated concrete containing wellan gum is small at various temperatures.

Wellan gum has a high viscosity at rest and a very low viscosity at high shear stress (Pseudoplastic property).

This property is one of the effects to avoid the separation of self-mortar.

It can be used with naphthalene, melamine and polycarboxyrate plasticizers / sensitizers.

Meanwhile, the fluidizing agent is a polycarboxylic acid-based fluidizing agent, and the polycarboxyrate is a dispersing & water reducing agent that exhibits high sensitivity and a slump-loss preventing agent that prevents the reduction of workability of mortar generated over time. Plays a role.

In addition, the existing mortar uses naphthalene-based, melamine-based, etc., but exhibits a working maintenance performance of 1 hour or more, which is about twice as long as 30 minutes of the existing working time of the mortar, and shows a high working performance with a small amount of input.

In addition, the density of the mortar itself is doubled to enhance the strength and lower the chloride ion penetration resistance, and serves to lower the conductivity of the mortar. It is a raw material for improving the pumping performance of mortar, improving workability and maintaining workability in summer. Reduce the shrinkage by reducing the unit quantity.

On the other hand, the chloride ion penetration improving agent is a pozzolanic ultrafine powder, and the pozzolanic ultrafine powder is a mixture of one or two or more selected from the group consisting of silica fume, high fine powder slag, and metakaolin and mixed with mortar to mortar. It is located in the micro-pores of densities, densifying mortar, increasing primary strength, lowering chloride ion penetration resistance, and lowering mortar conductivity.

The reactive pozzolanic ultrafine powder has a reaction mechanism for causing a pozzolanic reaction, and has a phenomenon in which small particles having a very fine plate shape of 0.5 μm or less having an average particle diameter of 2 times or more smaller than about 1 μm are aggregated. In addition to reduced hydrate and MSH hydrate production, internal tissues are densified and external ions are less likely to penetrate, resulting in more than twice the resistance to chemical erosion and reduced production of calcium chloride (CaCl ₂ ). Therefore, the amount of generated alumina chloride to expand the internal structure of the concrete is reduced, thereby densifying the internal structure of the cement hardener, thereby suppressing erosion of seawater.

In addition, the mixture of one or two or more is composed of an amorphous silicon oxide (SiO ₂ ) component to play an important role in improving the flowability of mortar, and reacts with calcium hydroxide (Ca (OH) ₂ ), a powder cement hydration product, calcium Pozolan reactions that produce silicate hydrate (CS-H) cause a dense internal structure over time, and the ability to adsorb CO ₂ , NH ₄ , and CH ₃ OH by means of a cavity created between the lattice gaps as a porous material have.

In particular, since NH ₄ has superior adsorption performance than ion exchange resins, it has an air purifying function such as odor removal, suppresses the loss of alkalinity of mortar, and delays neutralization, thereby suppressing corrosion of reinforcing steel in mortar.

On the other hand, the anti-corrosive agent by using a modified fluoroalkyl silane or modified silane polymer acrylic (acryl), modified amino silane in the modified silane compound to increase the high-performance rust protection and chloride ion penetration resistance, R-Si (RO) 3 , Neopentyl glycol diglycidyl ether, triethylolpropane triglycidyl ether, polypropylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6 hexanediol diglycidyl ether By using any two or more selected to increase the hydrophobicity of the mortar due to the modified Aklysiloxane to reduce the external moisture permeation factor to lower the mortar conductivity and lower the chloride ion penetration resistance.

On the other hand, hydrozinium sulphate and Cupric carbonate are nonmetallic chemicals that meet with water and generate gas to generate volume expansion. This early micropores in the mortar improve the mortar transfer / pumping performance from the body of the spray equipment to the nozzle of the spray equipment, ie the construction site. In addition, since the initial micropores are installed at high pressure in the nozzles of the spray equipment, the micropores disappear after spraying and do not interfere with the mortar's density due to the micropores after the construction. .

Hereinafter, the present invention will be described in more detail with reference to various embodiments.

Example 1

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 56 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; It consists of 0.5 weight part of a fluidizing agent.

Example 2

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 49.8 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.5 part by weight of a glidant; It consists of 6 parts by weight of chloride ion permeation improver.

Example 3

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 49.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of.

Example 4

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 48.6 parts of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 1 weight part of rust inhibitors.

Example 5

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

Example 6

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 46.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 3 parts by weight of rust preventive agent.

Example 7

39 parts by weight of anti-corrosive mortar cement combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

Test items for Example 1 to Example 7 having the configuration as described above are as follows.

Example 1 is a general polymer cement formulation, and commonly used naphthalene or melamine-based fluidizing agents.

It can be seen that the rate of change of length is very stable due to the use of an appropriate amount of the expanding agent CSA.

When comparing Example 1 and Example 2, due to the addition of chloride ion permeation improver (pozzolanic ultra fine powder), the workability was poor, and a polycarboxylic acid-based fluidizing agent was added, and the pumping performance was greatly improved due to its strong dispersing force. Although the value was higher than the standard, the mortality of mortar was insufficient, but the compressive strength, the rust prevention rate, and chloride ion penetration resistance were partially improved.

When comparing Example 2 and Example 3, the flow value was measured within the standard by the addition of thixotropic thickener and work performance improving agent, and it was predicted that the pumping performance was very excellent in appearance.

Comparing Example 3 and Example 4, when the antirust / chloride ion penetration resistance improving agent was added, it did not affect the flow value within the reference value, and it can be seen that most of the physical properties were adjusted up. In particular, it can be seen that the chloride ion permeation resistance was reduced to about 59% compared to the initial Example 1.

When comparing Example 4 and Example 5, the antirust / chloride ion permeation resistance improving agent was doubled, and the overall physical properties increased accordingly, especially the chloride ion permeation resistance was reduced to 79%, which is very excellent. One result is shown.

When comparing Example 5 and Example 6, the antirust and chloride ion permeation resistance improving agent was added three times as compared with Example 3, and overall physical properties were not changed, but in particular, the result of the decrease in strength was observed. .

Example 7 was added to improve the pumping performance in Example 5, did not have a significant effect on the experimental results, when the actual pumping puzmaster equipment is about 7bar lowered to about 20% improved the pumping performance can be seen that have.

Puzmaster Equipment

Name Quantity Specification Mortar mixer 1 set ① Maker: Putzmeister ② Type: S5EVTM ③ Mixer: Volume: 200ℓ Power: 10 KW, 200-380 V (3-phase) Mortar pump 1 set Puzemeister (screw type), volume 150ℓ Pump pressure: 25-40 ㎏f / ㎠ Power: 24-36kw, 3 phase, 200-380V Inverter 1 set 3-phase, 220-380 V, 38 mm Pressure hose 2 38mm X 10-50m Compressor 1 set Air volume: More than 3.5 ㎥ / min Pressure: 7- 9.5㎏f / ㎠ Capacity: 15 horsepower generator 1 set 30 KVA or more (use site power)

Hereinafter, the repair and reinforcement of the reinforced concrete structure using the anti-corrosive mortar which serves as the coating and the cross-sectional recovery of the self-sacrificing electrode according to the present invention having the above-described configuration will be described.

[Process Example 1]

1 is a cross-sectional view 1 showing a state of repairing and reinforcing reinforced concrete structures using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of a self-sacrificing electrode according to the present invention, and FIG. 1 is a perspective view showing a self-sacrificing assembly for repairing and reinforcing reinforced concrete structures using an anti-corrosive mortar which also serves as a cross-sectional recovery, and FIG. 4 is a perspective view showing a junction box for structure repair and reinforcement, and FIG. 4 is an exemplary view showing monitoring of repair and reinforcement of reinforced concrete structures using anti-corrosive mortar having both a coating and cross-sectional recovery of a self-sacrificing electrode according to the present invention.

As shown in these drawings, the reinforcement concrete structure repair and reinforcement method using the anti-rust mortar combined with the coating and the cross-sectional recovery of the self-sacrificing electrode according to the present invention comprises the steps of: chipping the target concrete structure (CS); Washing the chipped reinforced concrete structure (CS) with high pressure water; Removing rust of the corroded steel (RS) of the cleaned portion; Installing a self-sacrificing assembly (SA), a junction box (JB), and a corrosion current measuring device (EM) on the corrosion reinforcing bar (RS); Applying an alkali donating agent (AM) to the self-sacrificing assembly (SA); Applying a primer (PM) on the applied alkalizing agent (AM); Applying an anti-rust mortar (RM) which serves as a coating and a cross-sectional recovery of a self-sacrificing electrode on the applied primer (PM); Coating an anti-neutralizing agent (NM) on the anti-rust mortar (RM) that serves as a coating and cross-sectional recovery of the self-immolative electrode; The self-sacrificing assembly SA is wirelessly received and monitored by the corrosion current measuring device EM.

Here, the alkali scavenger (AM) is a yellow transparent liquid whose main component is permeable lithium nitrite, when mixed with the repair mortar or concrete to restore the alkalinity of the neutralized concrete, and prevents reinforcing corrosion by forming an inert film on the surface of the reinforcing bar. It is admixture.

In particular, the alkali impregnating agent (AM) is superior to other inorganic or organic rust inhibitors, and the antirust effect of the reinforced concrete structure (CS), and strengthens the concrete surface of the reinforced concrete structure (CS), so that the concrete volume expansion by the alkali aggregate reaction It contains ionic materials to prevent the improvement of concrete properties that are easily affected by external influences, and it has excellent anti-neutralization effect, suppresses the ingress of carbon dioxide and chloride, controls the progress of neutralization and salt damage, and improves performance at low temperature construction. The mortar to which the alkali-imparting agent (AM) is added can be constructed even at minus 10 ° C., acts as a high-performance adhesive mortar, and is excellent in protection against concrete because it is excellent in rust prevention, adhesion, waterproofing, impact resistance, and the like.

How to use

The alkaline impregnant (AM) must be determined by field test before use to determine the optimum blending design and the amount of use.In the case of using mixed water, the mixed water is pre-weighed and placed in the mixer. After mixing well to ensure a uniform mixture, the equipment should be cleaned and stored immediately after use.

In addition, the primer (PM) is an epoxy resin concrete adhesive for integrating and integrating new concrete onto the existing reinforced concrete structure (CS) surface, and has a long usable time to enable reinforcement and formwork after application, highway bridges, and pavement. Ideal for connecting to roads, harbors, and factory retaining walls. Suitable for both horizontal, vertical and internal and external surfaces. Used on dry ground, high strength, better adhesive strength than old concrete, pot life. This long, confined work is possible.

In particular, the epoxy resin concrete adhesive is a solvent-free epoxy resin containing a pigment and a fine filler, and two types of materials are metered and supplied so that they can be used directly in the field. The base is white and the hardener is green.

How to use

Ready

All debris on the substrate should be removed and rebar and formwork should be completed before mixing the epoxy resin concrete adhesive.

mix

After stirring thoroughly before mixing, the curing agent is poured into the base and mixed for 2 minutes with a low speed drill and mixing furnace until the two materials are completely mixed and the same color is obtained. Scrape the container surface and mix for another 2 minutes.

daub

Completely mix the epoxy resin concrete adhesive with a brush and apply it directly to the prepared surface. When the epoxy resin concrete adhesive is used for repair and reinforcement, the coating film must be applied twice so as not to damage the coating film.

In addition, the primer (PM) is used as a primer of old and new concrete adhesive and high strength repair mortar as a modified acrylic resin concrete adhesive.

The modified acrylic resin concrete adhesive is a one-component type does not require a separate mixing, easy to use, excellent adhesion between the repair mortar and concrete, can be installed on both vertical and ceiling surfaces, both inside and outside It is economical and can be used as a new and old adhesive.

Therefore, the primer (PM) is a modified acrylic resin concrete adhesive, which is a white one-component product, has a resistance to hydrolysis, and can be used both inside and outside.

In addition, the self-sacrificing assembly SA is an assembly used to protect the cathode of the steel reinforcement of the reinforced concrete structure CS, and has a metal anode 1 having a lower potential than steel, and is in electrical contact with the metal anode 1. And it is composed of an electrical connector 6 made of a soft metal, the metal anode (1) is formed in the form of a block around a portion of the electrical connector (6).

The connector 6 consists of one or more wires.

The connector 6 consists of a plurality of wires, some of which are twisted together, and the metal anode 1 is formed around the twisted portion.

The wires are twisted together at midpoints between the ends of the wires, the wires extending outward from one or more sides of the metal anode 1.

The metal anode (1) is surrounded by a porous material cast around the metal anode (1), the porous material is corrosion of the metal anode (1) and the metal when the metal anode (1) is electrically connected to the reinforcing body It contains an electrolytic solution having a sufficiently high pH index to prevent the formation of a floating film at the anode 1.

The metal anode (1) is made of zinc, the porous material is a cement-based mortar containing an electrolytic solution with a pH index of 14 or more.

It is connected to the reinforcement by winding the connector 6 around the reinforcement.

That is, the self-sacrificing assembly SA as described above is provided with an assembly used for cathodic protection of the steel reinforcement of the reinforced concrete structure CS, and the assembly has a lower potential than the steel and is in electrical contact with the steel ( 1) and a long connector made of a soft metal that can be wound around the stiffener to be protected.

The anode is preferably made of zinc, but aluminum, cadmium or magnesium may also be used, and alloys of these metals are also used.

The electrical contact between the connector 6 and the anode is preferably cast in block form around a portion of the connector 6 with a long anode.

Alternatively, electrical contact is made by the long connector 6 being wound around the anode or by the connector 6 being coupled to or attached to the anode.

The long connector 6 may be used in another long form, but is formed in the form of a wire for convenience.

Such wire is made of steel for convenience, but is preferably made of mild steel.

Preferably such wires have as much corrosion resistance as steel reinforcements or stronger corrosion resistance than steel reinforcements.

The connector 6 is formed of a plurality of wires twisted to a constant length, and the anode is cast around the twisted portion. The twisted portion serves to increase the surface area of the wire in forming a contact with the casting anode, thereby improving electrical contact performance. The wires are twisted together at midpoints between the wire ends, so that the wires extend to both sides of the cast anode.

International Patent Publication No. 94/29496 (European Patent Publication No. 0707667) discloses a cathode protection method in which a cathode is surrounded by a material having a high pH index electrolyte and continuously protects the cathode. It is recommended that the pH index be at least 14 for zinc anodes to avoid surface stabilization of the anodes.

Suitable materials disclosed in the above literature are cement-based mortars that are cast around the anode to form units. Such cement-based mortar may be easily utilized, but mortar is not necessarily cement-based. These mortars are essentially produced from cements with a high alkali content, so it is necessary to add, for example, sodium or lithium hydroxide to the mortar. Preferably lithium hydroxide is suitable.

The self-sacrificing assembly SA described above comprises a porous material, such as cement-based mortar, for example cast around the anode. Casting here means forming a solid block from a mortar of liquid or quasi-liquid. Porous material refers to a material comprising a high pH index electrolyte disclosed in European Patent Publication No. 0707667. That is, it is a material containing an electrolytic solution having a sufficiently high pH index to avoid corrosion of the anode and formation of a floating film at the anode when the anode is electrically connected to the reinforcing body. In the case of cement-based mortars, the electrolytic solution is a pore solution.

Mortar has an alkali component equivalent to at least 1% lithium hydroxide on the basis of the dry weight used when making mortar. The equivalent amount of lithium hydroxide is 2% by weight. Sometimes the amount of lithium hydroxide exceeds 2% or the equivalent amount of sodium hydroxide is 4%.

Lithium hydroxide is preferred because lithium ions provide protection against alkali silica (or alkali aggregate) reactions in concrete. However, mixtures of alkalis can be used, for example mixtures of lithium hydroxide and sodium hydroxide.

Porous materials such as anode mortar and castings are the same as described in EP0707667.

The self-sacrificing assembly (SA) installation method as described above is a method of installing an electrical anode for protecting the steel reinforcement of the reinforced concrete structure (CS), the long connector (6) made of the electrical anode and the flexible metal (6) And (b) forming an electrical connection between the long connector 6 and the reinforcing body by winding the long connector 6 around the reinforcing body.

The step (a) here comprises the step of twisting the ends of the elongated connector 6 together using a braiding tool to securely wind the electrical connector 6 around the reinforcement.

Another step (c) may be carried out before or after step (b), which step (c) contains an electrolytic solution that has a sufficiently high pH index to prevent corrosion and formation of the floating film at the anode. Casting the perimeter of the anode with a porous material.

Preferably, when the positive electrode is zinc, the pH index of the electrolytic solution is 14. If the anode is a metal such as aluminum, the pH index is 13.3 or 13.5, which is lower than zinc. The pH index is determined by the measurement of hydroxyl ion concentration, the formula of which is pH = 14 + log (OH−) according to Sorsen.

The self-sacrificing assembly as described above is applied to construct a new concrete structure (CS), the self-sacrificing assembly (SA) in this reinforced concrete structure (CS) is connected to the reinforcement by the connector (6), and the mortar and Likewise a porous material with a high pH index is cast around the anode.

In addition, the self-sacrificing assembly (SA) is applied to the protection of the reinforced concrete structure (CS), the method of forming a hole in the reinforced concrete structure (CS), inserting a positive electrode in the hole, the positive electrode The connector 6 and the reinforcement are connected, and a material of high pH index is cast on the anode.

On the other hand, the junction box (JB) is connected to the self-sacrificing assembly (SA) by the wire (EW) can be connected to the corrosion current measuring device (EM) receives the current of the self-sacrificing assembly (SA) and the corrosion reinforcing bar (RS) As the junction box JB, a plurality of switches are built in.

In addition, the corrosion current measuring device (EM) receives the current of the junction box (JB) in a military area or coastal reinforced concrete structure (CS) that is impossible to measure the corrosion current directly by using the corrosion current measurement function and the transmission device through the modem. It is a device that can measure corrosion current in remote receiving devices (Internet, mobile phones, etc.) by directly connecting to junction box (JB).

And the meter (MA) is connected to the wire (EW) between the junction box (JB) and the corrosion current measuring device (EM), the meter (MA) is a red sensor and a black sensor to measure the corrosion current in a conduit can do.

On the other hand, the anti-corrosive mortar (RM) that serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 54.24 parts of silica sand; 2.96 parts by weight of shrinkage compensation agent; 1.4 parts by weight of polymer; 0.1 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; It consists of 1.6 parts by weight of chloride ion permeation improver.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 56 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; It consists of 0.3 weight part of glidants.

And, the anti-corrosive mortar (RM), which serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 49.8 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.5 part by weight of a glidant; It consists of 6 parts by weight of chloride ion permeation improver.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 49.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; It consists of 6 parts by weight of chloride ion permeation improver.

And, the anti-corrosive mortar (RM), which serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 48.6 parts of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 1 weight part of rust inhibitors.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

And, the anti-corrosive mortar (RM), which serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 46.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 3 parts by weight of rust preventive agent.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

Meanwhile, the anti-neutralization agent (NM) is an elastic water-based protective coating agent composed mainly of an aliphatic acrylic polymer having no impurities, and protects the reinforced concrete structure (CS) exposed to the atmosphere from acid gas, chlorine ion, oxygen, and water, and especially cracks. It is suitable for the possibility of occurrence and can be used for all reinforced concrete structures (CS) inland and offshore.

Specifically, the neutralization agent (NM) is the resistance to cracking in the motion of the crack and 2㎜ ^{0.3㎜, CO 2, Cl -,} O 2 has excellent toughness in water, and acrylic polymers and minimize dust deposition Water vapor can be evaporated from the reinforced concrete structure (CS), has excellent resistance to ultraviolet rays, is aqueous, and has various colors.

Properties

 Test Methods  Test result  Solid content  50%   CO2 resistant air layer  More than 50 mita after 2000 hours of initial 50m shing  Water vapor diffusion resistance  SD 0.14 meters, 200 dft  Chloride resistance  No chlorine ion penetration after 100 days.  Static crack resistance  2 mm  Dynamic crack resistance  0.3mm

How to use

Ready

Remove all foreign matter from the construction surface, clean it and dry it. If there are voids, fill them.

Apply

After applying and drying the primer (PM) it is uniformly applied with a brush, roller, spray, and the like.

 Number of application: 1 time  Coating rate: 0.4 liter / ㎡  1 coat thickness (immediately after application): 400 microns  Recoating time (20 ℃): After drying completely

Packing and usage

 Packing: 20㎏ / pail  Usage: 0.4-0.5ℓ / ㎡

In addition, the step of monitoring the self-sacrificing assembly SA with the corrosion current measuring device EM is directly confirmed through a graph appearing on the corrosion current measuring device EM.

[Process Example 2]

5 is a cross-sectional view illustrating a state in which a reinforced concrete structure is repaired and reinforced using anti-corrosive mortar having a coating and cross-sectional recovery of a self-sacrificing electrode according to the present invention.

As shown in these drawings, the reinforcement concrete structure repairing and reinforcing method using the anti-corrosive mortar combined with the coating and the cross-sectional recovery of the self-sacrificing electrode according to the present invention comprises the steps of: coring and cutting the target reinforcement concrete structure (CS); Installing a self-sacrificing assembly (SB), a junction box (JB) and a corrosion current measuring device (EM) on the corroded steel (RS) of the coring and cut reinforced concrete structure (CS); Applying a primer (PM) to the self-sacrificing assembly (SB); Applying anti-rust mortar (RM) which serves as a coating and cross-sectional recovery of the self-sacrificing electrode on the primer (PM); Coating an anti-neutralizing agent (NM) on the anti-rust mortar (RM) that serves as a coating and cross-sectional recovery of the self-immolative electrode; The self-sacrificing assembly (SB) consists of a step of wirelessly receiving and monitoring the contents transmitted from the corrosion current measuring device (EM).

Here, the self-sacrificing assembly (SB) is a sacrificial anode assembly that is a method and / or passivating the cathode to the metal portion, the cathode and the anode is arranged to make an ionic contact without electronic contact with each other so that the current flows to the cathode and the anode. battery; A connector attached to the positive electrode of the battery so as to electrically connect the positive electrode to the metal part of the negative electrode type; And a sacrificial anode connected in series and electrically connected to the negative electrode of the battery, wherein the battery is a separate one from the surroundings, and the current is configured to flow into or out of the battery only through the sacrificial anode and the connector. .

The sacrificial anode and the battery are connected together to form a single unit. The sacrificial anode assembly consists of a single unit. The sacrificial anode is located near the cell. The sacrificial anode is configured to be aligned with at least a portion of the battery in a shape or size corresponding to at least a portion of the battery. The sacrificial anode is configured in the form of a container so that the battery can be located therein. The sacrificial anode is directly connected to the negative electrode of the cell through an electrically conductive separator. The metal layer is positioned between the sacrificial anode and the cathode of the battery to allow electronic conduction between the sacrificial anode and the cathode of the battery and prevent direct contact between the sacrificial anode and the cathode of the battery. The sacrificial anode is made of one of zinc, aluminum, cadmium, magnesium or an alloy of one or more of these metals. The battery has a pore separator located between the negative electrode and the positive electrode, and the pore separator prevents direct contact between the negative electrode and the positive electrode. The battery of the self-sacrificing assembly SB is separated from the outside by one or more separating means located around the battery in addition to the connection with the connector and the need for the sacrificial anode. The self-sacrificing assembly (SB) is in the shape of a container, the battery is located in the container, and the battery region is not covered by the sacrificial anode and is in contact with the connector separated from the outside by one or more separating means. It is not covered by. The sacrificial anode is shaped like a can and the cell is located in the can. The self-immolative assembly is surrounded by a capsule material. The capsule material is a porous base material. The porous base material has the properties of cement. The porous base material includes any one of lithium hydroxide and potassium hydroxide and has a pH of 12-14. The porous base consists of calcium sulphoaluminate. The metal part is sufficiently etched and / or passivated with a cathode. That is, the self-sacrificing assembly (SB), which is a method and / or passivation as a cathode in the metal part, includes a battery in which current flows through the cathode and the anode by arranging the cathode and the anode to each other to make ionic contact without electronic contact with each other. Attach the battery's positive electrode to a connector that electrically connects the positive electrode to the metal part, which is the negative electrode, and the battery's negative electrode is connected in series and electrically to the sacrificial anode, but the battery is a separate and separate current from the surroundings. The battery can only flow in or out through the connector. When the self-sacrificing assembly is connected to the metal part to be a cathode, for example in the case of iron reinforcement in reinforced concrete structure CS, the potential difference between the metal part and the sacrificial anode is greater than the natural potential difference between the metal part and the sacrificial anode. Large, high-resistance circuits allow useful levels of current flow. Therefore, the self-sacrificing assembly (SB) cannot supply the sacrificial cathode method to the metal part where the sacrificial cathode method cannot be applied to a useful level because of the circuit between the metal part and the sacrificial anode constituted by a high resistance such as an electrolyte. .

Furthermore, when the potential difference between the metal portion and the sacrificial anode is greater than the natural potential difference between the metal portion and the sacrificial anode, it is possible to increase the spacing between the anodes in the assembly in which the plurality of self-immolative assemblies SB are arranged. Of course, by doing so, it is possible to reduce the total number of self-sacrificing assemblies SB required in a given reinforced concrete structure CS.

In addition, the self-sacrificing assembly (SB) according to the invention produces a high initial current, which is particularly the metal in which the self-sacrificing assembly (SB) is in an active corrosion state or in a new reinforced concrete structure (CS), ie a metal such as iron. Useful when

Furthermore, the self-sacrificing assembly (SB) according to the present invention may be properly located in a structure or other structure including a metal part requiring a cathode method, or may be included in the same or similar material as that of the structure. Wherein the included assembly is stable to the exterior environment of the structure. Thus, the appearance of the structure can be maintained because the exterior of the structure itself and other components are not placed outside of the structure.

When the self-sacrificing assembly battery of the present invention is finally discharged, the sacrificial part is still active, thus providing a negative electrode method.

The sacrificial anode and the battery are connected to each other to form a single unit, and in particular, the self-sacrificing assembly SB may be a single unit. This is because the product is not complicated, there is an advantage that the self-sacrificing assembly (SB) can be easily included in a structure similar to or similar to the structure or the structure comprising a metal part.

In particular, the sacrificial anode can be positioned adjacent to a cell in the assembly. The sacrificial anode may be shaped or sized to correspond to at least part of the shape of the battery and may be aligned with at least part of the battery. Preferably, the sacrificial anode forms a container so that the cell can be located therein.

The sacrificial anode may be directly connected to the negative electrode of the battery by directly contacting the negative electrode of the battery, or may be indirectly connected to the negative electrode of the battery. Preferably, the sacrificial anode is indirectly connected to the negative electrode of the cell through an electrically conductive separator. This has the advantage of helping to prevent direct corrosion of the sacrificial anode when in contact with the negative electrode of the battery. For example, a metal layer, such as a copper or nickel plating layer, is positioned between the sacrificial anode and the cathode of the battery to enable electron conduction therebetween without direct contact.

The sacrificial anode must have a positive standard electrode potential with respect to the metal that is catalyzed by the self-sacrificing assembly (SB). Thus, when the self-sacrificing assembly SB is used for the reinforced concrete structure CS, the sacrificial anode must have a negative standard electrode potential with respect to iron. Suitable examples are metals such as zinc, aluminum, cadmium and magnesium, and alloys include zinc alloys, aluminum alloys, cadmium alloys and magnesium alloys. The sacrificial anode is suitably provided in the form of cast metal / alloy, compressed powder, fibrous or foil.

As a connector for electrically connecting the positive electrode to the metal part of the negative electrode type, a connector used with a sacrificial anode may be used. In particular, the connector may be used iron, galvanized steel or brass, it may be made of a suitable wire (EW) shape. Galvanized iron wire is preferred.

The battery may be an electrochemical battery. In particular, the cell comprises a positive electrode of a suitable material and a negative electrode of a suitable material, which of course provides a negative standard electrode potential for the negative electrode. Suitable materials for use as the anode include metals such as zinc, aluminum, cadmium, lithium and magnesium and alloys such as zinc alloys, aluminum alloys, cadmium alloys and magnesium alloys. As the metal used as the cathode, a metal mixture including carbon oxides and metal oxides such as manganese, iron, copper, silver and lead oxides, for example, a mixture of manganese dioxide and carbon is suitable. The positive and negative electrodes may each be supplied in any suitable form and may be supplied in the same or different forms. For example, it may be provided in solid form such as cast metal / alloy, compressed powder, fiber or foil, or in the form of loose powder.

The anode is preferably in contact with the electrolyte. When the anode is in the form of loose powder, this powder may be included in the electrolyte. The electrolyte may be a known electrolyte such as potassium hydroxide, lithium hydroxide, or ammonium chloride. The electrolyte may include additional agents. In particular, the electrolyte may include a compound that prevents the hydroxide from being discharged from the anode. For example, when the anode is zinc, the electrolyte may include zinc oxide.

The positive electrode and the negative electrode are arranged to be in ionic contact only without electronic contact with each other so that current flows from the positive electrode to the negative electrode. In this regard, the positive electrode and the negative electrode are preferably connected through the electrolyte as in the conventional battery. Thus, the electrolyte is properly supplied between the anode and the cathode so that the ion current flows properly between the anode and the cathode.

The battery may include a pore separator positioned between the negative electrode and the positive electrode, and serves to prevent direct contact between the positive electrode and the negative electrode. This is particularly useful in the self-sacrificing assembly (SB) of the present invention, whereby the anode is supplied in loose powder form and more useful when the powder is included in the electrolyte.

In the self-sacrificing assembly (SB), the battery is separated from the outside in addition to the connection with the connector and the need for a sacrificial anode. This is possible by using suitable separation means around the cell. This separation is particularly useful to prevent external electrolytes from contacting the cell. The cell can be separated in this way by one or more separating means. This separation means must be electrically insulating material which does not carry current, such as a silicon based material.

Since electrical insulation of the sacrificial anode is one of the electrical connections with the battery, the amount of separation means required can be reduced by increasing the external area of the battery neighboring the sacrificial anode. Thus preferably the sacrificial anode is in the shape of a container and the cell is located in the container. For example, the sacrificial anode is a cavity, ie a cavity with a circular bottom and a wall extending upward from the circumference and the cell is located within this cylinder. Of course, the remaining area of the battery not covered by the sacrificial anode and the contact portion of the connector is separated from the outside by the separating means.

The amount of the positive and negative electrode materials used in the self-sacrificing assembly SB is preferably equal to the amount of load required for the life of the self-sacrificing assembly SB, which maximizes the efficiency of the self-sacrificing assembly SB.

The anode assembly is surrounded by a capsule material such as a porous base material. In particular, the assembly may be a suitable capsule material precast surrounding the assembly prior to use. Alternatively, the encapsulating material may be provided after the assembly is located, for example, the assembly may be located in a recessed portion of the reinforced concrete structure CS, and may be buried with the appropriate encapsulating material.

The encapsulant material can maintain the activity of the sacrificial anode container and / or absorb the expansion forces generated by the expansion plant and / or minimize direct contact between the sacrificial anode and the conductor discharging the internal cell in the positive electrode assembly. For example, mortar, which has properties of cement, may be used as the capsule material.

The positive electrode assembly is preferably surrounded by a material for encapsulation comprising an active agent which causes the sacrificial anode to continuously corrode. For example, when the anode assembly is connected to the cathode by the anode assembly to the cathode, the electrolyte in the solvent has a sufficient pH to prevent corrosion of the sacrificial anode and formation of a passivation film on the sacrificial anode. In particular the encapsulating material comprises an alkaline reservoir such as lithium hydroxide or potassium hydroxide or other suitable active agent known in the art such as wetting agents. The capsule material preferably uses a high alkali mortar covering the sacrificial anode as known in the art, for example a mortar having a pH of 12 to 14 comprising lithium hydroxide or potassium hydroxide. Suitable high speed hardening cements can be used as mortar. In particular it is used in embodiments in which the capsule material is columnar. For example, Portland cement mortar may be used in which calcium sulfur aluminate is used as the mortar or a water / cement ratio of at least 0.6 including additional lithium hydroxide or potassium hydroxide such as mortar discussed in US Pat.

On the other hand, the self-sacrificing assembly (SB) according to the present invention provides a method of etching the metal as the negative electrode, which is attached to the metal as the negative electrode through the connector of the assembly. In particular, a method is provided in which the iron reinforcement in the reinforced concrete structure (CS) is catalyzed.

In addition, the present invention is directed to a structure in which a partial or total reinforcement is catalyzed by a cathode.

On the other hand, the primer (PM) is an epoxy resin concrete adhesive for integrating and integrating new concrete on the existing reinforced concrete structure (CS) surface, the available time is long to enable reinforcement and formwork after application, highway bridges, pavement Ideal for connecting roads, harbors, and plant retaining walls. Suitable for both horizontal and vertical surfaces, as well as inside and outside. Used on dry ground, high strength, superior to tensile strength of concrete, long pot life, and sealed. You can work in the same place.

In particular, the epoxy resin concrete adhesive is a solvent-free epoxy resin containing a pigment and a fine filler, and two types of materials are metered and supplied so that they can be used directly in the field. The base is white and the hardener is green.

How to use

Ready

All debris on the substrate should be removed and rebar and formwork should be completed before mixing the epoxy resin concrete adhesive.

mix

After stirring thoroughly before mixing, the curing agent is poured into the base and mixed for 2 minutes with a low speed drill and mixing furnace until the two materials are completely mixed and the same color is obtained. Scrape the container surface and mix for another 2 minutes.

daub

Completely mix the epoxy resin concrete adhesive with a brush and apply it directly to the prepared surface. When the epoxy resin concrete adhesive is used for repair and reinforcement, the coating film must be applied twice so as not to damage the coating film.

In addition, the primer (PM) is used as a primer (PM) of old and new concrete adhesive and high strength repair mortar as a modified acrylic resin concrete adhesive.

The modified acrylic resin concrete adhesive is a one-component type does not require a separate mixing, easy to use, excellent adhesion between the repair mortar and concrete, can be installed on both vertical and ceiling surfaces, both inside and outside It is economical and can be used as a new and old adhesive.

Therefore, the primer (PM) is a modified acrylic resin concrete adhesive, which is a white one-component product, has a resistance to hydrolysis, and can be used both inside and outside.

On the other hand, the anti-corrosive mortar (RM) that serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 54.24 parts of silica sand; 2.96 parts by weight of shrinkage compensation agent; 1.4 parts by weight of polymer; 0.1 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; It consists of 1.6 parts by weight of chloride ion permeation improver.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 56 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; It consists of 0.3 weight part of glidants.

And anti-corrosive mortar (RM) that serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 49.8 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.5 part by weight of a glidant; It consists of 6 parts by weight of chloride ion permeation improver.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 49.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; It consists of 6 parts by weight of chloride ion permeation improver.

And, the anti-corrosive mortar (RM), which serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 48.6 parts of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 1 weight part of rust inhibitors.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

And, the anti-corrosive mortar (RM), which serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 46.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 3 parts by weight of rust preventive agent.

In addition, the anti-corrosive mortar (RM) serving as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 part by weight of a thickener; 0.5 part by weight of a glidant; 6 parts by weight of chloride ion permeation improver; It consists of 2 parts by weight of rust preventive agent.

Meanwhile, the anti-neutralization agent (NM) is an elastic water-based protective coating agent composed mainly of an aliphatic acrylic polymer having no impurities, and protects the reinforced concrete structure (CS) exposed to the atmosphere from acid gas, chlorine ion, oxygen, and water, and especially cracks. It is suitable for the possibility of occurrence and can be used for all reinforced concrete structures (CS) inland and offshore.

Specifically, the neutralization agent (NM) is the resistance to cracking in the motion of the crack and 2㎜ ^{0.3㎜, CO 2, Cl -,} O 2 has excellent toughness in water, and acrylic polymers and minimize dust deposition Water vapor can be evaporated from the structure, has excellent UV resistance, is aqueous, and has various colors.

How to use

Ready

Remove all foreign matter from the construction surface, clean it and dry it. If there are voids, fill them.

Apply

After applying and drying the primer (PM) it is uniformly applied with a brush, roller, spray, and the like.

 Number of application: 1 time  Coating rate: 0.4 liter / ㎡  1 coat thickness (immediately after application): 400 microns  Recoating time (20 ℃): After drying completely

Packing and usage

 Packing: 20㎏ / pail  Usage: 0.4-0.5ℓ / ㎡

On the other hand, the step of monitoring the self-sacrificing assembly (SB) with a corrosion current measuring device (EM) is configured to check directly through a graph appearing on the corrosion current measuring device (EM).

1 is a cross-sectional view showing a state of repairing and reinforcing reinforced concrete structures using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of a self-sacrificing electrode according to the present invention.

Figure 2 is a perspective view showing a self-sacrificing assembly of reinforcement concrete structure repair and reinforcement using anti-corrosive mortar combined with coating and cross-sectional recovery of the self-sacrificial electrode according to the present invention 1,

3 is a perspective view showing a junction box for repairing and reinforcing reinforced concrete structures using anti-corrosive mortar that serves as a coating and cross-sectional recovery of a self-sacrificing electrode according to the present invention;

4 is an exemplary view showing monitoring of reinforcement and reinforcement of reinforced concrete structures using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention;

Figure 5 is a cross-sectional view showing a state of repairing and reinforcing the reinforced concrete structure using the anti-corrosive mortar combined with the coating and cross-sectional recovery of the self-sacrificing electrode according to the present invention.

Explanation of symbols on the main parts of the drawing

1: metal anode 2: anode

3: cathode 4: electrolyte

5: separator 6: connector

7: sacrificial anode 8: insulation layer

AM: alkali donor (Galvashield NL)
CS: reinforced concrete structure

EM: Corrosion current measuring device EW: Wire

JB: Junction Box MA: Meter

NM: Galvanshield Elastic
PM: Galalvashield Primer

RS: Corroded Rebar
RM: Antirust Mortar (Galvashield Plaster)

SA: Self-Sacrifice Assembly (Galvashield XP, CC)
SB: Self-Sacrifice Assembly (Galvashield XP, CC)

Claims (15)

delete Chipping the target reinforced concrete structure (CS); Washing the chipped reinforced concrete structure (CS) with high pressure water; Removing rust of the corroded steel (RS) of the cleaned portion; Installing a self-sacrificing assembly (SA), a junction box (JB), and a corrosion current measuring device (EM) on the corrosion reinforcing bar (RS); Applying an alkali donating agent (AM) to the self-sacrificing assembly (SA); Applying a primer (PM) on the applied alkalizing agent (AM); Applying an anti-rust mortar (RM) which serves as a coating and a cross-sectional recovery of a self-sacrificing electrode on the applied primer (PM); Coating an anti-neutralizing agent (NM) on the anti-rust mortar (RM) that serves as a coating and cross-sectional recovery of the self-immolative electrode; Reinforced concrete structure using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of the self-sacrificial electrode, characterized in that the self-sacrificing assembly (SA) is wirelessly receiving and monitoring the contents transmitted from the corrosion current measuring device (EM) Repair and reinforcement method. The method of claim 2, The alkali impregnating agent (AM) is a repair and reinforcement method for reinforced concrete structures using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of a self-immolative electrode, characterized in that it consists of a permeable lithium nitrite solution. The method of claim 2, The primer (PM) repair and reinforce the reinforced concrete structure using the anti-rust mortar that serves as a coating and cross-sectional recovery of the self-sacrificial electrode characterized in that the epoxy resin concrete adhesive. The method of claim 2, The primer (PM) repair and reinforce the reinforced concrete structure using anti-corrosive mortar that serves as a coating and cross-sectional recovery of the self-sacrificing electrode, characterized in that composed of a modified acrylic resin concrete adhesive. The method of claim 2, The self-sacrificing assembly (SA) is an assembly used to protect the negative electrode of the steel reinforcement of the reinforced concrete structure (CS), the metal anode (1) having a lower potential than the steel, and is in electrical contact with the metal anode (1) It consists of an electrical connector 6 made of a soft metal, the metal anode (1) is formed in the form of a block around the part of the electrical connector (6), the connector (6) is composed of one or more wires, The connector 6 consists of a plurality of wires, some of which are twisted together, wherein the metal anode 1 is formed around the twisted portion, the wires being twisted together at an intermediate point between the ends of the wire. The wire is formed extending outward from at least one side of the metal anode (1), the metal anode (1) is surrounded by a porous material cast around the metal anode (1), the porous material has a pH index 14 this Reinforced concrete structure using anti-corrosive mortar, which has a coating and cross-sectional recovery of self-sacrificial electrode, characterized in that it is connected to the reinforcement by winding the connector 6 around the reinforcement. Reinforcement method. The method of claim 2, Anti-corrosive mortar (RM) that serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 parts by weight of a natural water-soluble polysaccharude thickener; 0.5 parts by weight of a polycarboxyrate fluidizing agent; 6 parts by weight of ultra-fine pozzolanic powder of 0.5 μm or less of any one of nano-silica, waste lime and diatomite, or a mixture of two or more thereof; 3 parts by weight of a rust preventive agent comprising 2 parts by weight of modified fluoroalkylsilane, 0.5 parts by weight of modified silane polymer acryl and 0.5 parts by weight of modified amino silane; Reinforced concrete structure repair and reinforcement method using anti-corrosive mortar with anticorrosive mortar, which is composed of 0.04 parts by weight of hydrozinium surphate and 0.04 parts by weight of polysaccharide. The method of claim 2, The anti-neutralization agent (NM) repair and reinforce the reinforced concrete structure using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of the self-sacrificing electrode, characterized in that composed of a fatty acrylic polymer. The method of claim 2, Monitoring the self-sacrificing assembly (SA) with a corrosion current measuring device (EM) is characterized in that the coating and cross-sectional recovery of the self-sacrificing electrode characterized in that it is directly confirmed through a graph appearing on the corrosion current measuring device (EM) Reinforced concrete structure repair and reinforcement method using anti-rust mortar. Coring and cutting the target reinforced concrete structure (CS); Installing a self-sacrificing assembly (SB), a junction box (JB) and a corrosion current measuring device (EM) on the corroded steel (RS) of the coring and cut reinforced concrete structure (CS); Applying a primer (PM) to the self-sacrificing assembly (SB); Applying anti-rust mortar (RM) which serves as a coating and cross-sectional recovery of the self-sacrificing electrode on the primer (PM); Coating an anti-neutralizing agent (NM) on the anti-rust mortar (RM) that serves as a coating and cross-sectional recovery of the self-immolative electrode; Reinforced concrete structure using the anti-corrosive mortar, which serves as a coating and cross-sectional recovery of the self-sacrificial electrode, characterized in that the self-sacrificing assembly (SB) wirelessly receives and monitors the contents transmitted from the corrosion current measuring device (EM) Repair and reinforcement method. The method of claim 10, The primer (PM) repair and reinforce the reinforced concrete structure using the anti-rust mortar that serves as a coating and cross-sectional recovery of the self-sacrificial electrode characterized in that the epoxy resin concrete adhesive. The method of claim 10, The primer (PM) repair and reinforce the reinforced concrete structure using anti-corrosive mortar that serves as a coating and cross-sectional recovery of the self-sacrificing electrode, characterized in that composed of a modified acrylic resin concrete adhesive. The method of claim 10, Anti-corrosive mortar (RM) that serves as a coating and cross-sectional recovery of the self-sacrificial electrode is 39 parts by weight of cement; 47.6 parts by weight of silica sand; 3 parts by weight of shrinkage compensators; 1.5 parts by weight of polymer; 0.2 part by weight of reinforcing fibers; 0.2 parts by weight of a natural water-soluble polysaccharude thickener; 0.5 parts by weight of a polycarboxyrate fluidizing agent; 6 parts by weight of ultra-fine pozzolanic powder of 0.5 μm or less of any one of nano-silica, waste lime and diatomite, or a mixture of two or more thereof; 3 parts by weight of a rust preventive agent comprising 2 parts by weight of modified fluoroalkylsilane, 0.5 parts by weight of modified silane polymer acryl and 0.5 parts by weight of modified amino silane; Reinforced concrete structure repair and reinforcement method using anti-corrosive mortar with anticorrosive mortar, which is composed of 0.04 parts by weight of hydrozinium surphate and 0.04 parts by weight of polysaccharide. The method of claim 10, The anti-neutralization agent (NM) repair and reinforce the reinforced concrete structure using anti-corrosive mortar, which serves as a coating and cross-sectional recovery of the self-sacrificing electrode, characterized in that composed of a fatty acrylic polymer. The method of claim 10, The step of monitoring the self-sacrificing assembly (SB) with a corrosion current measuring device (EM) is to check the coating and the cross-sectional recovery of the self-sacrificing electrode characterized in that it is directly confirmed through a graph appearing on the corrosion current measuring device (EM). Reinforced concrete structure repair and reinforcement method using anti-rust mortar.

Images