KR100958912B1 - Organic/ceramic hybrid composite and a method of repairing or reinforcing the humid concrete surface - Google Patents

Abstract

PURPOSE: An organic/ceramic hybrid repair and reinforcement material for concrete, and a concrete repairing and reinforcing method using thereof are provided to restore the cross section of the concrete by a waterproof and an anticorrosion function. CONSTITUTION: An organic/ceramic hybrid repair and reinforcement material for concrete contains 40~50wt% of magnesium silicate powder, 10~15wt% of zinc oxide powder, 3~5wt% of alumina, 7~10wt% of zirconia powder, 10~15wt% of aggregate including cement, pebbles, quartz sand and sand, and others. The reinforcing method using the material comprises the following steps: marking a position for construction and operating a water blockage process; spraying a derusting agent to a corroded reinforcing rod; high-pressure cleaning the position for construction; spraying a primer after drying; spreading the repair and reinforcement material; spraying a post-treating agent; and curing.

Description

Organic / ceramic hybrid composite and a method of repairing or reinforcing the humid concrete surface}

The present invention relates to an organic / ceramic hybrid composite underwater and wet surface concrete reinforcement material and a method for repairing and reinforcing underwater and wet surface concrete using the same.

Among the techniques related to the conventional concrete repair and reinforcement, as disclosed in Korean Patent Laid-Open Publication No. 10-2004-0058537, when the concrete structure is repaired, it enhances adhesion to the interface between the old concrete and the repair mortar and improves the durability of the structure for a long time. Organic / inorganic crosslinking type for strengthening interfacial adhesion of old and new concretes with inorganic polymer structure manufactured by metal alkoxide and de-alcoholization as coating agent of permeable alkoxy silane hybrid type interfacial adhesion enhancer using nano synthesis technology Composite polymer coating compositions and production methods are known.

However, the conventional techniques as described above, as the base of sea breeze, seawater, and calcium chloride for snow removal penetrate into the concrete to corrode the concrete, and the base penetrates in the presence of water, causing the concrete to expand and cause cracking. It can shorten the life span, and it can't meet the use of various structures that require high strength, waterproofness, and durability because it can't sufficiently prevent the voids caused by concrete hardening. In addition, the resistance to the drug is also weakened, there is a disadvantage that can not continuously endure acid, alkali, salt, water, daylight and the like.

In particular, in Korea, where there are four distinct seasons, the temperature changes of concrete structures are repeated, the surface of concrete structures are always exposed to wet conditions due to the groundwater level, the conditions of repeated wetting and drying, and the concrete structures are Structures exist under various conditions such as those present in seawater, and defects such as cracking, peeling and dropping are likely to occur in concrete structures regardless of any conditions.

Conventional repair and reinforcement methods for these concrete structures are known to have some effect in the air environment, but when used in concrete in areas exposed to wet conditions, due to hardening and poor adhesion, Peeling occurs. In addition, due to the lower elastic modulus than concrete, the reinforcing effect of the structure is remarkably decreased, and it is pointed out that the adhesion strength is very low in the wet conditions. The adhesion and reinforcement performance with the existing concrete structures is excellent in the air, wet and underwater conditions, There is a need for a method having anticorrosive performance.

Therefore, the present invention is to provide a method having excellent adhesion and reinforcement performance with the existing concrete structure in the air, wet, underwater conditions, waterproof and anticorrosive, and organic / ceramic hybrid composite underwater and wet surface concrete reinforcement used therein. do.

According to an aspect of the present invention, an organic / ceramic hybrid composite for concrete water or reinforcement is disclosed, wherein the composite is 40-50 wt% magnesium silicate powder, 10-15 wt% zinc oxide powder, 3-5 wt% alumina, 7-10% by weight of zirconia powder, 10-15% by weight of aggregate including cement and gravel, silica and sand, 5-10% by weight of expanded polyolefin powder, 3-5% by weight of ceramic powder, 2-4% by weight of acrylic ester emulsion , 1-2 wt% of the nanoemulsion dispersant, 1-2 wt% of the surfactant, and 0.5-1 wt% of the antifoaming agent.

According to another aspect of the present invention, there is disclosed a concrete repair or reinforcement method, the concrete repair or reinforcement method (a) marking the range to be constructed and the water barrier operation, (b) removing the rust of the construction site and exposed Applying a rust conversion agent, if present, (c) applying a high pressure wash to the construction site, (d) applying a pretreatment agent (or primer) after drying, (e) applying a composite for repair or reinforcement of concrete (F) applying a treatment agent (or finish) after the coating, and (g) curing.

The pretreatment agent includes 60-70 wt% of silicone polymer, 10-20 wt% of polyamide resin, 10-20 wt% of ceramic powder, 2-5 wt% of titanium dioxide, and 2-5 wt% of aluminum silicate. It is preferable to achieve this desired effect.

The concrete repair or reinforcement composite includes magnesium silicate powder 40-50% by weight, zinc oxide powder 10-15% by weight, alumina 3-5% by weight, zirconia powder 7-10% by weight, cement and gravel, silica sand and sand Aggregate 10-15 wt%, expanded polyolefin powder 5-10 wt%, ceramic powder 3-5 wt%, acrylic ester emulsion 2-4 wt%, nano emulsion dispersant 1-2 wt%, surfactant 1-2 wt% , And 0.5-1% by weight of an antifoaming agent are preferred for achieving the desired effect of the present invention.

The post-treatment agent is a two-component pretreatment agent consisting of an binder in emulsion form and an inorganic filler in powder form, wherein the binder is composed of 35-65 wt% of acrylic ester emulsion, 1.7-3.5 wt% of water and 0.01-0.5 wt% of antifoaming agent. In addition, the inorganic filler is preferably 20-40% by weight of silica sand, 8-16% by weight of functional cement, 1.5-4% by weight of clay to achieve the desired effect of the present invention.

According to one embodiment of the invention, the polyolefin is preferably selected from polyethylene, polypropylene, polybutylene.

According to another embodiment of the present invention, the nanoemulsion dispersant is preferably selected from condensed naphthalene sulfonic acid sodium salt and calcium naphthalene sulfonic acid salt.

According to another embodiment of the present invention, it is preferable that the acrylic acid ester emulsion has a particle diameter of 0.3-30 in the acrylic acid ester resin.

According to another embodiment of the present invention, the surfactant is sulfoxypolyethylene glycol allyl ether, sulfoxy polypropylene glycol allyl ether, sulfoxy polybutylene glycol allyl ether, sulfoxy polyethylene glycol 2-butenyl ether, sulfoxy Polypropylene glycol 2- butenyl ether, sulfoxy polybutylene glycol 2- butenyl ether, sulfoxy polyethylene glycol 3- butenyl ether, sulfoxy polypropylene glycol 3- butenyl ether, sulfoxy polybutylene glycol 3- Butenyl ether, sulfoxypolyethylene glycol 3-pentenyl ether, sulfoxy polypropylene glycol 3-pentenyl ether, sulfoxy polybutylene glycol 3-pentenyl ether; Sulfoxypolyethylene glycol (3-vinyl-5-methyl) phenyl ether, sulfoxypolypropylene glycol (3-vinyl-5-methyl) phenyl ether, sulfoxypolybutylene glycol (3-vinyl-5-methyl) phenyl ether , Sulfoxypolyethylene glycol (3-vinyl-5-ethyl) phenyl ether, sulfoxypolypropylene glycol (3-vinyl-5-ethyl) phenyl ether, sulfoxypolybutylene glycol (3-vinyl-5-ethyl) phenyl Ether, sulfoxypolypropylene glycol (3-propenyl-5-propyl) phenyl ether, sulfoxypolybutylene glycol (3-propenyl-5-propyl) phenyl ether, sulfoxypolyethylene glycol (3-propenyl-5 -Butyl) phenyl ether, sulfoxy polypropylene glycol (3-propenyl-5-butyl) phenyl ether, sulfoxy polybutylene glycol (3-propenyl-5-butyl) phenyl ether; 2-sulfoxypolyethylene glycol-3- (4-methylphenoxy) propylene allyl ether, 2-sulfoxy polypropylene glycol-3- (4-methylphenoxy) propylene ether, 2-sulfoxypolybutylene glycol-3 -(4-methylphenoxy) propylene allyl ether, 2-sulfoxypolyethylene glycol-3- (4-ethylphenoxy) propylene allyl ether, 2-sulfoxy polypropylene glycol-3- (4-ethylphenoxy) propylene Allyl ether, 2-sulfoxypolybutylene glycol-3- (4-ethylphenoxy) propylene allyl ether.

Concrete repair or reinforcement composite material and concrete repair or reinforcement method using the same according to the present invention shows a significantly improved results in terms of corrosion resistance and impact resistance, as well as strength, such as tensile strength, compressive strength, tensile shear adhesive strength.

In addition, when repairing or reinforcing concrete according to various embodiments of the present invention, high strength, high corrosion resistance, chemical resistance, abrasion resistance, fluidity and adhesiveness may be obtained.

-Excellent adhesion in wet and water (3 times more adhesive strength than existing repair materials)

-Excellent adhesive performance regardless of the material of target structure (durability is semi-permanent)

-Excellent durability of material (neutralization, salt, freeze-thawing, etc.), acid resistance, flame resistance, abrasion resistance, chemical resistance

-Since the method of the present invention is a high-density curing state, it prevents the microorganisms from sticking, so the corrosion resistance is excellent.

-Strong adhesion and abrasion resistance prevents corrosion of concrete

-It is a new repair / reinforcement method in which molecular bonds with molecules due to self-heating

-Excellent underwater resistance enables adhesive hardening in freshwater and seawater

  -The curing time can be adjusted according to the working environment and conditions, thus shortening the repair / reinforcement construction period.

  -Since the method and waterproof effect are excellent, no additional process is required after repair / reinforcement.

  -Can be used in combination with cement, gravel, sand, silica sand, etc. as a solvent-free state of base and hardener

  -Diluents can be used in one-sided refining agents in high temperature environments or when available and prolongation of curing time is required.

  -Extend the service life by adding 30-100cc of diluent to the diluted section repair agent according to the standard

This method can change the construction and material properties according to the various material and structural properties of the existing concrete structure. The concrete repair or reinforcement composite material of the present invention, in which ceramic, spherical alumina, zirconia, and the like is added, has excellent adhesion to wet structures and can be installed in water, and repairs structures by providing elastic modulus similar to that of concrete. The reinforcing effect can be increased. In addition, it is a new construction method that ensures strength and durability in general environment, salty environment, and highly corrosive (sulphate) environment.

The present invention relates to an organic / ceramic hybrid composite material having a similar elastic behavior according to the properties or properties of the existing concrete and a method for repairing and reinforcing the existing concrete cross section using the same.

According to one embodiment of the present invention below, concrete repair reinforcement can be constructed as described below.

1) Concrete Surface Treatment

① Concrete surface should be free of cement and other foreign matters.

② There should be no materials that worsen the adhesion and permeability to the construction surface, and foreign substances should be thoroughly removed.

③ Remove the damaged part of the existing concrete surface with a hand breaker or water blast.

④ Peel force 10 kg / cm ² Keep it on

⑤ Chipping depth should conform to design book and site situation.

⑥ Carry out rust removal work on corroded rebar.

2) High pressure water washing

Remove foreign substances such as dust using a high pressure cleaner (100-150 bar) on the surface of concrete.

3) Corrosion rebar conversion material and coating material application

① Apply rust conversion material to corroded steel.

② After curing, rust-proof with coating material.

4) pretreatment

① When the pot life is determined according to the site conditions and construction methods (eg, the concrete repair or reinforcement section reinforcement time of the present invention), select the composite for repair or reinforcement of the concrete according to the pot life.

② Perform pretreatment with primer on bottom surface.

③ Use rollers, brushes and pressure guns depending on the site conditions.

④ It should be uniformly installed on the floor after pretreatment work.

5) Section repair material, post treatment

① After the pretreatment is completely hardened, pour the cross-section plunger on the floor and perform the post-treatment.

② For the casting method, choose the most suitable method among the field casting method, the prefect method, the spraying method using the mixing equipment for concrete repair or reinforcement composite of the present invention.

③ If diluent is used, ask the manufacturer to determine the proper amount.

Concrete repair reinforcement work performed in accordance with various embodiments of the present invention is subjected to the following quality control.

① All materials to be used for construction must be of the type of quality that meets all specifications, regulations and Korean industrial standards, and must be approved by the KDHC.

② The management test shall be carried out in the presence of the supervisor, in accordance with the implementation regulations of the Construction Quality Test Regulations.

③ When repairing the cross section, make sure that the gap between the sphere and the existing sphere does not occur more than 2mm and that the surface of the used material is not left behind.

④ Strength test shall be made on every 1,500 m2 of reinforcement section for imported materials or when the supervision is deemed necessary.

⑤ Test standards shall be conducted according to the values indicated in the specification for each manufacturer, and the test score report shall be submitted to the supervisor.

⑥ In order to improve the quality of repair and reinforcement, prepare a check list for each work type according to the application specification during construction.

Example

First of all, marking the scope to be constructed and water-blocking work, remove the rust of the construction site, and if there is exposed rebar was applied a rust conversion agent, and then the high pressure washing to the construction site. Then, after the pretreatment was applied after drying, the composite for repair or reinforcement of concrete was applied, and the curing treatment was applied after the posttreatment was applied.

In the examples, a pretreatment agent comprised of 65% by weight of silicone polymer, 15% by weight of polyamide resin, 15% by weight of ceramic powder, 3% by weight of titanium dioxide, and 2% by weight of aluminum silicate was used.

In addition, in the embodiment, 45% by weight of magnesium silicate powder, 12% by weight of zinc oxide powder, 4% by weight of alumina, 9% by weight of zirconia powder, 12% by weight of aggregate including cement and gravel, silica sand and sand, foamed polypropylene powder 8 A concrete repair or reinforcement composite was used consisting of 4% by weight, 4% by weight of ceramic powder, 3% by weight of acrylic ester emulsion, 1.5% by weight of nanoemulsion dispersant, 1% by weight of surfactant, and 0.5% by weight of antifoaming agent.

In addition, in the embodiment, a two-component post-treatment agent consisting of an emulsion-type binder and a powder-type inorganic filler was used, and the binder was composed of 50% by weight of an acrylic ester emulsion, 2.5% by weight of water and 0.03% by weight of an antifoaming agent, and the inorganic filler For example, 35 wt% of silica sand, 10 wt% of functional cement, and 2.47 wt% of clay were used.

Comparative example  One

The experiment was conducted in the same manner as in Example, except that the pretreatment agent of the above example used an ammine liquid polymer instead of the silicone polymer.

Comparative example  2

The experiment was conducted in the same manner as in the above example except that the expanded polyurethane powder was used instead of the expanded polypropylene powder in the concrete repair or reinforcement composite of the above embodiment.

Comparative example  3

The experiment was conducted in the same manner as in the above example, except that the amine liquid polymer was used instead of the acrylic ester emulsion in the concrete post-treatment agent.

Comparative example  4

The experiment was conducted in the same manner as in the above example, except that the pretreatment step was not performed.

Comparative example  5

The experiment was conducted in the same manner as in the above example except that the post-treatment step was not performed.

Experimental Example  One

After performing the experiment in the above embodiment, the quality of the following items was tested, and the results as shown in the following table were obtained.

Strength test results

Test Items Test result importance 1.5 The tensile strength 176 kg / ㎠ or more Compressive strength 412 kg / ㎠ or more Tensile Shear Adhesion Strength More than 112 kg / ㎠ Hardness 80 kg / ㎠ or more

Corrosion Resistance Test Results

Test Items Test Methods Test result Brine deposition test 10% NaCl, maintained at 80 ± 5 ℃,
6,000 hours (250 days) deposition clear Gasoline test Room temperature,
6,000 hours (250 days) deposition clear Hot water test Maintaining at 100 ℃,
6,000 hours (250 days) deposition clear

Impact resistance test

Test Methods Test result A 63.5 mm, 1,040 g steel ball was fixed at a speed of free fall at a height of 25 mm by applying a thick cloth to the surface-treated opposite side of a 1m x 1m sample and repeatedly impacting the steel ball. Up to 50,000 collisions
clear

compare Experimental Example  1-5

After performing the experiment in Comparative Example 1-5, and tested the same quality as in Experimental Example 1, the tensile strength, compressive strength, tensile shear bond strength was mostly reduced by 10-20% compared to the Example .

In addition, the corrosion resistance was also confirmed on the surface treated with corrosion that can be clearly distinguished in appearance by more than 2,500 hours in most of Comparative Examples 1-5, unlike the examples in which the test time was not abnormal even at 6,000 hours or more.

In addition, the impact resistance was also confirmed that in the comparative example 1-5, the repaired or reinforced part is detached and detached from the treated surface more than 10,000 times, unlike the embodiment that was no abnormality up to 50,000 collisions.

1 is a view schematically showing a step of repairing or reinforcing concrete according to an embodiment of the present invention.

Claims (10)

Organic / ceramic hybrid composite for concrete water or reinforcement, The composite material is 40-50% by weight of magnesium silicate powder, 10-15% by weight of zinc oxide powder, 3-5% by weight of alumina, 7-10% by weight of zirconia powder, aggregate 10-15 including cement and gravel, silica and sand. Wt%, expanded polyolefin powder 5-10 wt%, ceramic powder 3-5 wt%, acrylic ester emulsion 2-4 wt%, nano emulsion dispersant 1-2 wt%, surfactant 1-2 wt%, and antifoam 0.5- Concrete repair or reinforcement composite material comprising 1% by weight. The composite material for repair or reinforcement of claim 1, wherein the polyolefin is selected from polyethylene, polypropylene, and polybutylene. The composite for repairing or reinforcing concrete according to claim 1, wherein the nanoemulsion dispersant is selected from condensed naphthalene sulfonic acid sodium salt and calcium naphthalene sulfonic acid salt. delete The method of claim 1, wherein the surfactant is sulfoxypolyethylene glycol allyl ether, sulfoxy polypropylene glycol allyl ether, sulfoxy polybutylene glycol allyl ether, sulfoxy polyethylene glycol 2-butenyl ether, sulfoxy polypropylene glycol 2 -Butenyl ether, sulfoxy polybutylene glycol 2-butenyl ether, sulfoxy polyethylene glycol 3-butenyl ether, sulfoxy polypropylene glycol 3-butenyl ether, sulfoxy polybutylene glycol 3-butenyl ether, Sulfoxypolyethylene glycol 3-pentenyl ether, sulfoxy polypropylene glycol 3-pentenyl ether, sulfoxy polybutylene glycol 3-pentenyl ether; Sulfoxypolyethylene glycol (3-vinyl-5-methyl) phenyl ether, sulfoxypolypropylene glycol (3-vinyl-5-methyl) phenyl ether, sulfoxypolybutylene glycol (3-vinyl-5-methyl) phenyl ether , Sulfoxypolyethylene glycol (3-vinyl-5-ethyl) phenyl ether, sulfoxypolypropylene glycol (3-vinyl-5-ethyl) phenyl ether, sulfoxypolybutylene glycol (3-vinyl-5-ethyl) phenyl Ether, sulfoxypolypropylene glycol (3-propenyl-5-propyl) phenyl ether, sulfoxypolybutylene glycol (3-propenyl-5-propyl) phenyl ether, sulfoxypolyethylene glycol (3-propenyl-5 -Butyl) phenyl ether, sulfoxy polypropylene glycol (3-propenyl-5-butyl) phenyl ether, sulfoxy polybutylene glycol (3-propenyl-5-butyl) phenyl ether; 2-sulfoxypolyethylene glycol-3- (4-methylphenoxy) propylene allyl ether, 2-sulfoxy polypropylene glycol-3- (4-methylphenoxy) propylene ether, 2-sulfoxypolybutylene glycol-3 -(4-methylphenoxy) propylene allyl ether, 2-sulfoxypolyethylene glycol-3- (4-ethylphenoxy) propylene allyl ether, 2-sulfoxy polypropylene glycol-3- (4-ethylphenoxy) propylene A composite for repair or reinforcement of concrete, characterized in that selected from allyl ether and 2-sulfoxypolybutylene glycol-3- (4-ethylphenoxy) propylene allyl ether. delete delete delete delete delete

Images