KR102403274B1 - Low carbon-type eco-friendly mortar composition for repairing and reinforcing concrete using geopolymer, and repairing and reinforcing method for concrete structure using the same and mesh-type reinforcing basalt member - Google Patents

Abstract

The present invention relates to a method for producing an environmentally friendly mortar composition by reducing CO_2 emission during cement manufacturing, and for performing repair/reinforcement of a concrete structure using the mortar composition, by forming the mortar composition through replacing conventional Portland cement, which emits a large amount of CO_2 during manufacture, with a geopolymer binder using inorganic materials (blast furnace slag, fly ash, metakaolin), which are industrial by-products with low CO_2 emission intensity, and by performing a repair/reinforcement method for the concrete structure using the mortar composition. According to the present invention, the mortar composition for carbon-reduced eco-friendly geopolymer concrete comprises 36 to 45 wt% of a geopolymer binder, 48 to 58 wt% of silica sand, 2 to 5 wt% of a redispersible powder resin, 0.3 to 0.5 wt% of a thickener, 0.1 to 0.3 wt% of an antifoaming agent, 0.5 to 1.5 wt% of basalt fibers, and 0.3 to 0.5 wt% of nylon fibers.

Description

Low carbon-type eco-friendly mortar composition for repairing and reinforcing concrete using geopolymer, and repairing and reinforcing method for concrete structure using the same and mesh-type reinforcing basalt member}

The present invention relates to a carbon-reduced eco-friendly geopolymer mortar composition for concrete and a method for repairing/reinforcing a concrete structure using the mortar composition and a basalt grid reinforcement material, and more specifically, to a conventional method in which a large amount of CO ₂ is emitted during manufacturing and production. Portland cement is replaced with a geopolymer binder using inorganic materials (blast furnace slag, fly ash, metakaolin), which are industrial by-products with a low CO ₂ emission unit, to compose a mortar composition, and use this to repair/reinforce concrete structures By performing the construction method, it is possible to reduce CO ₂ emissions during cement manufacturing and produce an environmentally friendly mortar composition, while reducing dust during on-site concrete work, resistance to freeze-thaw and chloride ion penetration, water permeability (permeability) , water absorption ratio (water absorption coefficient) and chemical resistance are excellent, so it delays the deterioration of rigidity and durability due to efflorescence and salt damage of repaired/reinforced concrete for inland and coastal structures. It relates to a construction method that allows repair/reinforcement to be performed.

About 8% _of the CO2 emission, which accounts for 55% of the greenhouse gas, is emitted from the cement manufacturing field, so research for reducing _the CO2 emission (carbon reduction) in cement manufacturing is being conducted in various fields. Accordingly, research is underway to reduce the amount of cement used and develop it as an alternative material by substituting industrial waste with a low CO ₂ emission unit for cement (especially Portland cement). Ground granulated blast-furnace slag powder that has undergone a pulverization process and a series of treatment processes by rapidly cooling Fly ash), etc., are used as admixtures for concrete with a low CO ₂ emission unit, thereby reducing CO ₂ emissions in the cement and concrete industries.

As part of this effort, without using Portland cement, inorganic compounds such as Si and Al-rich blast furnace slag, fly ash, metakaolin, and silica fume, such as sodium hydroxide (or calcium hydroxide), sodium silicate ( Or potassium silicate) and sodium sulfate (or calcium sulfate) to replace Portland cement with a geopolymer binder that has the properties of a binder using a reaction (hydration and polymerization) activated by an alkaline activator. are doing Geopolymers form Si-O-Al-O bonds of polymers by chemical reaction with Al-Si minerals in a high alkali state. Geopolymer-generating compounds have properties similar to natural rocks, so they are superior in strength and durability. It is known to exhibit better properties than concrete using Portland cement. Above all, in that various industrial wastes or by-products such as blast furnace slag and fly ash can be used as raw materials, geopolymer binders are gaining interest as a very promising binder for mortar for concrete.

Republic of Korea Patent Publication No. 10-2017-0114611 'Shrink-free cement mortar composition' (published on October 16, 2017)

The problem to be solved by the present invention is a geopolymer using inorganic materials (blast furnace slag, fly ash, metakaolin), which are industrial by-products that emit a small amount of CO ₂ compared to conventional Portland cement, which emits a large amount of CO ₂ during production. By replacing it with a binder, it is intended to provide an environmentally friendly repair/reinforcement method for concrete structures.

Another problem to be solved by the present invention is seismic repair of a concrete structure using an eco-friendly earthquake-resistant mortar composition that is not only excellent in constructability and durability but also low in production cost by utilizing industrial waste (blast furnace slag, fly ash, metakaolin) This is to provide a /reinforcement method.

Another problem to be solved by the present invention is that it has excellent compressive strength and flexural strength (breaking load) compared to the case where construction and curing were performed using the conventional mortar composition containing Portland cement. This is to provide a repair/reinforcement method suitable for reinforcement.

Another problem to be solved by the present invention is resistance to freezing and thawing, water permeability (permeability), absorption ratio (water absorption coefficient) compared to the case of performing construction and curing using a conventional mortar composition containing Portland cement. It is intended to provide a method of repairing/reinforcing concrete structures with excellent waterproofness and workability while preventing deterioration of rigidity and durability due to efflorescence and salt damage due to excellent chemical resistance and chemical resistance.

Another problem to be solved by the present invention is that it has excellent flexural strength and adhesion strength to construct walls, slabs, girders, bridges, piers, etc. of concrete structures, or to repair/reinforce existing structures. An object of the present invention is to provide a seismic repair/reinforcement method for a concrete structure using a seismic-resistance reinforcing material processed with a phosphorus mortar composition and basalt fiber.

In order to solve the above problems, the mortar composition for eco-friendly geopolymer concrete according to the present invention is 36 wt% to 45 wt% of a geopolymer binder, 48 wt% to 58 wt% of silica sand, 2 wt% to 5 wt% of redispersible powder resin %, 0.3 wt% to 0.5 wt% of a thickener, and 0.1 wt% to 0.3 wt% of an antifoaming agent.

At this time, the geopolymer binder may include 57 wt% to 63 wt% of blast furnace slag powder, 14 wt% to 20 wt% fly ash, 1.5 wt% to 2.5 wt% metakaolin, 8 wt% to 12 wt% calcium hydroxide can

In this case, the geopolymer binder may further include 6 wt% to 10 wt% of a calcium sulfoaluminate-based expansion material.

At this time, the geopolymer binder may further include 2 wt% to 4 wt% of calcium stearate.

At this time, the mortar composition for eco-friendly geopolymer concrete according to the present invention may further include 0.5% by weight to 1.5% by weight of basalt fiber, 0.3% by weight to 0.5% by weight of nylon fiber.

In this case, the bazart fiber may be a bazart fiber having a length of 3 mm, and the nylon fiber may be a hydrophilic nylon fiber having a length of 6 mm.

At this time, the mortar composition for eco-friendly geopolymer concrete according to the present invention is the silica sand with a size of 1.2mm to 1.5mm (No. 4) 2 wt% to 4 wt%, 0.7mm to 1.2mm (No. 5) 38 wt% to 42 wt%, 0.1mm to 0.35mm of silica sand (No. 7 yarn) 8 wt% to 12 wt% may be included.

At this time, the geopolymer binder is 57 wt% to 63 wt% of the blast furnace slag powder, 14 wt% to 20 wt% of fly ash, 1.5 wt% to 2.5 wt% of metakaolin, 8 wt% to 12 wt% of calcium hydroxide %, with respect to the first mixture uniformly mixed by mixing 6% to 10% by weight of the calcium sulfoaluminate-based expansion material at a low speed of 90rpm to 100rpm in a weightless mixer, 2% by weight to 4% by weight of the calcium stearate additionally It can be prepared by input and high-speed mixing at 150 rpm to 800 rpm.

At this time, the mortar composition for eco-friendly geopolymer concrete according to the present invention is a primary mixture of 36% by weight to 45% by weight of the geopolymer binder and 48% by weight to 58% by weight of the silica sand at 60 rpm to 90 rpm in a zero-gravity mixer With respect to the mixture, 2 wt% to 5 wt% of the redispersible powder resin, 0.1 wt% to 0.3 wt% of the antifoaming agent, and 0.3 wt% to 0.5 wt% of the thickener are added and uniformly mixed to produce a secondary mixture, 0.5 wt% to 1.5 wt% of the basalt fiber and 0.3 wt% to 0.4 wt% of the nylon fiber with respect to the secondary mixture may be additionally added and uniformly mixed.

In addition, in order to solve the above problems, a concrete structure repair/reinforcement method using a mortar composition for eco-friendly geopolymer concrete according to the present invention includes: removing the deteriorated surface of the concrete structure; chipping or high pressure water washing and dust removal; Installing a reinforcing material manufactured by processing basalt fibers in the concrete structure; Blast furnace slag powder 57% to 63% by weight, fly ash 14% to 20% by weight, metakaolin 1.5% to 2.5% by weight, calcium hydroxide 8% to 12% by weight, calcium sulfoaluminate-based expansion material 6% by weight to Geopolymer binder composed of 10 wt%, 2 wt% to 4 wt% of calcium stearate, 36 wt% to 45 wt%, silica sand (No. 4 yarn) 2 wt% to 4 wt%, silica sand (No. 5 yarn) 38 wt% to 42 Weight %, silica sand (No. 7 yarn) 8% to 12% by weight, redispersible powder resin 2% to 5% by weight, thickener 0.3% to 0.5% by weight, antifoaming agent 0.1% to 0.3% by weight, 3mm of basalt 0.5 wt% to 1.5 wt% of fibers, 0.3 wt% to 0.5 wt% of hydrophilic nylon fibers of 6mm pouring a mortar prepared by mixing water with a mortar composition for geopolymer concrete on the surface of the concrete structure in which the reinforcement is installed; curing the mortar; And it may include the step of applying a contamination-resistant neutralizing organic-inorganic composite protective agent.

In this case, the reinforcing material may be a reinforcing material of a mesh shape in which members manufactured by processing a basalt fiber bundle are arranged in a grid shape.

In this case, the grid network reinforcement member may have a plurality of columns and rows in the cross section of the members arranged in a plurality of columns and rows is fixed.

At this time, the lattice network reinforcement material is coated with urea liquid resin on the surface of the member manufactured by processing the basalt fiber bundle, and silica sand is dispersed and attached to the surface of the member coated with the urea resin, and then the urea resin is applied By hardening, the surface may have a concave-convex structure made of silica sand.

According to the present invention, by replacing the conventional Portland cement, which emits a large amount of CO ₂ during production, with a geopolymer binder using inorganic materials (blast furnace slag, fly ash, metakaolin), which are industrial by-products that emit a small amount of CO ₂ , , it has the effect of providing an environmentally friendly repair/reinforcement method for concrete structures.

In addition, according to the present invention, an earthquake-resistant repair/reinforcement method for a concrete structure using an eco-friendly earthquake-resistant mortar composition that has excellent constructability and durability and is inexpensive to produce by using industrial waste (blast furnace slag, fly ash, metakaolin) effect that can be provided.

In addition, according to the present invention, the compressive strength and flexural strength (breaking load) are excellent compared to the case of construction and curing using the existing mortar composition containing Portland cement, so repair suitable for reinforcement of concrete structures requiring seismic performance / It has the effect of providing a reinforcement method.

In addition, according to the present invention, compared to the case of performing construction and curing using the conventional mortar composition containing Portland cement, resistance to freeze-thaw, water permeability (permeability), absorption ratio (water absorption coefficient), and chemical resistance It has an effect of providing a method of repairing/reinforcing concrete structures with excellent waterproofness and workability while preventing deterioration of rigidity and durability due to whitening and salt damage due to excellent chemical resistance.

In addition, according to the present invention, an environmentally friendly mortar composition with strong resistance to earthquakes in the construction of walls, slabs, girders, bridges, piers, etc. of concrete structures or repair/reinforcement of existing structures due to excellent flexural strength and adhesion strength, and There is an effect that can provide an earthquake-resistant repair/reinforcement method for a concrete structure using a seismic-resistant reinforcing material processed with basalt fiber.

1 is a flowchart illustrating a method of repairing/reinforcing a concrete structure using a mortar composition for eco-friendly geopolymer concrete according to the present invention.
2 is a view showing a cross-section of a concrete structure repaired/reinforced using the mortar composition for geopolymer concrete according to the present invention.
3 is a view for explaining a reinforcing material installed in a concrete structure in a method of repairing/reinforcing a concrete structure using a mortar composition for eco-friendly geopolymer concrete.
4 is a view for explaining an embodiment of a grid mesh reinforcement installed in a concrete structure in a method of repairing/reinforcing a concrete structure using a mortar composition for eco-friendly geopolymer concrete.
FIG. 5 is a view for explaining an embodiment of a basalt fiber rebar constituting a reinforcing material installed in a concrete structure in a method of repairing/reinforcing a concrete structure using a mortar composition for eco-friendly geopolymer concrete.

The present invention will be described in detail with reference to the accompanying drawings as follows. Here, repeated descriptions, well-known functions that may unnecessarily obscure the gist of the present invention, and detailed descriptions of configurations will be omitted. The embodiments of the present invention are provided in order to more completely explain the present invention to those of ordinary skill in the art.

The mortar composition for geopolymer concrete according to the present invention is a geopolymer binder 36 wt% to 45 wt%, silica sand (SiO ₂ ) 48 wt% to 58 wt%, redispersible powder resin 2 wt% to 5 wt%, thickener 0.3 wt% % to 0.5% by weight, antifoaming agent 0.1% to 0.3% by weight, basalt fiber 0.5% to 1.5% by weight, and nylon fiber 0.3% to 0.5% by weight. The mortar composition for geopolymer concrete according to the present invention is mixed with water (mixed water) in an appropriate amount to form a mortar, and is poured on the deteriorated surface of an aged concrete structure in which reinforcement is installed.

Here, the geopolymer binder includes an inorganic compound, an industrial by-product, and an alkaline activator that activates the inorganic compound by adding water to have the properties of a geopolymer binder. As a component to replace Portland cement, which is the main component of the existing mortar, In the present invention, 72.5 wt% to 85.5 wt% of an inorganic material rich in Si and Al, 8 wt% to 12 wt% of calcium hydroxide (Ca(OH) ₂ ), 6 wt% to 10 wt% of a calcium sulfa aluminate (CSA, calcium sulfa aluminate)-based expansion material and 2 wt% to 4 wt% of calcium stearate. In particular, the inorganic material includes 57 wt% to 63 wt% of blast furnace slag powder, 14 wt% to 20 wt% fly ash, and 1.5 wt% to 2.5 wt% of metakaolin.

inorganic material

As an inorganic material that is activated by an alkaline activator to have the properties of a geopolymer binder, it is one of blast furnace slag, fly ash, metakaolin, and silica fume, which are generally aluminosilicate-based (or calcium aluminosilicate-based) industrial byproduct inorganic compounds. Alternatively, two types are mixed and used, but in the present invention, three types of inorganic materials such as blast furnace slag, fly ash and metakaolin are mixed and used in order to increase the reactivity between the materials. The inorganic material mixed with blast furnace slag, fly ash and metakaolin is preferably used within the range of 72.5 wt% to 85.5 wt% based on 100 wt% of the total geopolymer binder according to the present invention. If the inorganic material among the geopolymer binders is less than 72.5% by weight, the geopolymer structure generated from the reactant is not dense and the strength decreases, and when it exceeds 85.5% by weight, calcium hydroxide (Ca(OH) ₂ ), which will be described later Since unreacted substances are generated during the reaction and the physical properties are reduced, it is preferable to set the mixing ratio to 72.5% by weight to 85.5% by weight. In particular, the mixing ratio between blast furnace slag, fly ash, and metakaolin as an inorganic material is 57 wt% to 63 wt% of blast furnace slag powder, 14 wt% to 20 wt% of fly ash, 1.5 wt% metakaolin based on 100 wt% of the total geopolymer binder % ~ 2.5% by weight is preferable, because if the content of the blast furnace slag powder in the geopolymer binder exceeds 63%, it is vulnerable to cracking due to self-shrinkage.

alkaline activator

As an alkaline activator (alkaline stimulant) used to induce the reactivity of inorganic compounds that are industrial by-products of aluminosilicate (or calcium aluminosilicate) industries such as blast furnace slag, fly ash, metakaolin, and silica fume, sodium hydroxide ( Alternatively, calcium hydroxide), sodium silicate (or potassium silicate), sodium sulfate (or calcium sulfate), etc. are used, and in the present invention, calcium hydroxide (Ca(OH) ₂ ) is used among these alkaline activators. Calcium hydroxide (Ca(OH) ₂ ) activator is calcium silicate hydrate (CSH gel) by hydration and polymerization to Al-Si mineral in a high alkali state for three types of mixed inorganic materials: blast furnace slag, fly ash, and metakaolin. By forming a dense geopolymer hardening body with amorphous microstructure of the type, there is an advantage in that it is easy to secure watertightness due to high strength resulting from this. Calcium hydroxide (Ca(OH) ₂ ) is preferably used within the range of 8 wt% to 12 wt% based on 100 wt% of the total geopolymer binder according to the present invention. When calcium hydroxide (Ca(OH) ₂ ) in the geopolymer binder is less than 8% by weight, unreacted substances are generated in the inorganic material mixed with blast furnace slag, fly ash and metakaolin, and the physical properties decrease, and the physical properties decrease by 12% by weight. %, there is a problem in that freeze-thaw resistance, chemical resistance, low shrinkage, etc. are reduced by a large amount of calcium hydroxide (Ca(OH) ₂ ) component that is present after the reaction.

inflatable

The expansion material is a component added to reduce cracking due to drying and shrinkage of the mortar. In the present invention, the expansion material uses a calcium sulfa aluminate (CSA, calcium sulfa aluminate) type expansion material. Calcium sulfoaluminate contains components such as calcium oxide (CaO), aluminum oxide (Al ₂ O ₃ ), silicon dioxide (SiO ₂ ), sulfur oxide (SO ₃ ), etc. to have rigidity. Calcium sulfoaluminate is acicular and columnar ethringite (C ₃ A·3CaSO ₄ ·32H ₂ O), monosulfate (C ₃ A·3CaSO ₄ ·12H ₂ O) and calcium hydroxide (Ca) through hydration reaction with water. (OH) ₂ ), such as hydrate crystals, exhibit expandability to prevent cracking of the hardened body due to drying and shrinkage and improve tensile strength. In the present invention, the calcium sulfoaluminate-based expandable material prevents cracking of the geopolymer hardened body due to drying shrinkage, improves tensile strength, and sufficiently secures rapid hardening and coarse rigidity along with expansibility, with respect to 100% by weight of the total geopolymer binder. It is preferably included in an amount of 6% by weight or more, and more preferably in the range of 6% by weight to 10% by weight.

Calcium Stearate

In the present invention, calcium stearate (Calcium Stearate, Ca(C ₁₇ H ₃₅ COO) ₂ ) is added as a component of the geopolymer binder. Calcium stearate is an inorganic salt and has high internal activity in the reaction state with water, so it has excellent gel formation, so it has waterproof performance in the mortar construction site. In particular, in the present invention, calcium stearate is preferably used in the range of 2% by weight to 4% by weight based on 100% by weight of the total geopolymer binder, and calcium stearate should be included in the range of 2% by weight to 4% by weight of the mortar By increasing the compressive strength of the concrete structure by more than 5%, while lowering the water permeability and absorption ratio to 25% or less, respectively, to have sufficient waterproofing performance in the mortar construction site, it is possible to increase the durability of the concrete structure and prevent adhesion contamination at the same time.

aggregate

Aggregate is a material that serves as a framework for mortar or concrete, and must be strong and chemically stable. Specifically, it is an aggregate selected from the group consisting of dry silica sand (SiO ₂ ) No. 4 to No. 7, and selected according to the site environmental conditions. It is preferable to be Silica sand (SiO ₂ ) as an aggregate is preferably used within the range of 48 wt% to 58 wt% with respect to 100 wt% of the total mortar composition according to the present invention. In particular, in the component ratio of the aggregate, in the present invention, the size of the silica sand (SiO ₂ ) No. 4 of the size of 1.2mm ~ 1.5mm 2 wt% ~ 4% by weight, 0.7mm ~ 1.2mm of the silica sand (SiO ₂ ) No. 5 yarn 38 wt% to 42 wt%, 0.1mm to 0.35mm silica sand (SiO ₂ ) It is preferable to select 8 wt% to 12 wt% of No. 7 yarn, and in the case of silica sand (SiO ₂ ) No. 4 to No. 7 yarn Since the particles gradually become finer, the stability of the fine aggregate granulation rate is increased by including 8 wt% to 12 wt% of silica sand (SiO ₂ ) No. 7, which is finer than the silica sand (SiO ₂ ) No. 4 and No. 5, and concrete It can increase the watertightness and improve the adhesion.

redispersible resin

The redispersible resin is a material that becomes a stable liquid resin when dispersed in water. The redispersible resin added to the mortar composition for geopolymer concrete according to the present invention is suitable for polymerization of vinyl acetate and ethylene. a copolymer powder resin (vinyl acetate-ethylene copolymer powder resin) by It is preferable that it is a powder resin selected from the group consisting of vinyl urate-vinyl chloride ternary polymer powder resin). Its properties have the same effect as the original liquid emulsion resin, and the powder resin dissolved in water forms an irreversible polymer film that does not dissolve in water after drying. function to increase The redispersible powder resin is preferably used within the range of 2 to 5% by weight based on 100% by weight of the total mortar composition according to the present invention. In particular, in the present invention, 1.2 to 3% by weight of Vinnapas 5111L, which is a copolymer powder resin by polymerization of vinyl acetate and ethylene, as an embodiment commercialized as the redispersible powder resin, and ethylene and It is preferable to use a mixture of 0.8 to 2% by weight of Vinnapas 8031H, which is a terpolymer powder resin of vinyl laurate and vinyl chloride.

bazart fiber

Basalt fiber is a non-toxic, non-toxic mineral rock fiber made from natural basalt fiber. It is cheaper than other inorganic fibers (glass fiber, metal fiber, aramid fiber, etc.), but also has electrical insulation, dust resistance, heat dissipation, heat resistance, and low heat. It has excellent advantages in expansion, sound insulation, sound absorption, erosion resistance, corrosion resistance, abrasion resistance, chemical stability, self-lubrication, light weight and high strength. In addition, the basalt fiber has superior properties compared to the existing glass fiber and is environmentally friendly. At this time, the basalt fiber added to the mortar composition for geopolymer concrete according to the present invention is SiO ₂ 47.5 to 55.0% by weight, TiO ₂ 0.2 to 2% by weight, Al ₂ O ₃ 14 to 20% by weight based on 100% by weight of the total. , 7 to 13.5% by weight of a mixture of Fe ₂ O ₃ and FeO, 7 to 11% by weight of CaO, 3 to 8.5% by weight of MgO, 0.25% by weight of MnO, 2.5 to 7.5% by weight of a mixture of Na ₂ O and K ₂ O, and SO ₃ It is preferable that the basalt fiber containing 0.2 to 0.8% by weight. The bazalt fiber has a length of 3 mm for dispersibility, and is preferably used in an amount of 0.5 wt% to 1.5 wt% based on 100 wt% of the total mortar composition according to the present invention, and the content of the bazalt fiber is 0.5 wt% When mixed with less than this, there is a problem in that heat resistance, cracking, and elastic strength are lowered, and when it exceeds 1.5% by weight, it is not uniformly mixed in the mortar composition due to excessive agglomeration. In addition, when the basalt fiber is added together with the redispersible resin, whitening does not occur on the surface of the cured mortar, and it does not react with CO ₂ in the air and produces calcium ions (Ca ⁻ ) even if it reacts with humidity. Pollution resistance can be prevented because CaCO ₃ is not generated. In particular, in order to solve the problem that the basalt fibers added to the mortar composition according to the present invention may not be uniformly mixed during production in a mortar factory due to agglomeration and poor workability even when mixed in an amount of 0.5% by weight or more, basalt fibers In order to increase the dispersibility of the fiber, it can be used by spraying the basalt yarn with mineral oil to form a coating film so that the mutual material forms an air layer. The mineral oil is also called liquid paraffin, and the mineral oil used in the present invention is preferably an alkane mineral oil having 20 to 40 carbon atoms. These coated basalt fibers melt basalt (volcanic rock) at 1,500°C and use centrifugal force to spin them into 9 to 20㎛ diameter filaments, spray low-viscosity mineral oil to coat, and then to have a length of 3 mm. It is preferably cut and used.

nylon fiber

Fiber reinforcement is a component added to minimize voids when mixing the materials constituting the mortar composition and to strengthen the connection and adhesion between materials, mainly coconut fiber, nylon fiber, glass fiber , Sisal fiber, PVA fiber (Polyvinyl alcohol), and polypropylene fiber may be used. In particular, since nylon fibers can prevent damage to the concrete part repaired and reinforced by the mortar composition by using excellent tensile strength, and suppress the occurrence of cracks due to external force by securing elasticity, in the present invention, such a fiber reinforcing material A hydrophilic nylon fiber having a length of 6 mm is used. In the present invention, the nylon fiber is preferably used within the range of 0.3 wt% to 0.5 wt% with respect to 100 wt% of the total mortar composition. There is no problem, and when it exceeds 0.5% by weight, the strength and adhesion of the concrete part to be repaired and reinforced by imbalance with other materials are lowered.

thickener

A thickener (thickening stabilizer) is a component added to improve the fluidity of the mortar. In the present invention, various types such as urethane, acrylic, cellulose, inorganic, etc. can be used. Hydroxypropyl, a water-soluble polymer having a viscosity of 20,000 CPS It is preferable to use a methyl cellulose (hydroxypropyl methylcellulose, HPMC)-based thickening stabilizer. In the present invention, the thickener is preferably used within the range of 0.3% by weight to 0.5% by weight based on 100% by weight of the total mortar composition. There is a problem of deterioration, and when it exceeds 0.5% by weight, the viscosity increases due to excessive mixing with other materials, and the curing time is delayed, so workability and equipment loss are large.

antifoam

Antifoaming agent is a material for improving durability such as scale resistance and maximizing insulation effect while preventing a decrease in concrete strength by refining air bubbles that may occur during the stirring process when each material of the mortar composition according to the present invention is mixed with water. , It is preferably used within the range of 0.1% by weight to 0.3% by weight based on 100% by weight of the total mortar composition according to the present invention. In this case, the antifoaming agent is neodecanoic acid glycidyl ester that can refine the generated bubbles into relatively large bubbles, and dodecyl trimethyl ammonium chloride that can refine the generated bubbles into relatively small bubbles. , DTAC) is preferably selected from the group consisting of, and in some cases, these may be mixed.

Hereinafter, a process for preparing the mortar composition for geopolymer concrete according to the present invention, including the above materials, will be described.

The zero-gravity mixer is a mixer that disperses the input materials in different directions according to a constant tip speed in the mixing chamber to form a fluidized bed in a zero-gravity state and mixes them in a short period of time. The mortar composition is manufactured by sequentially introducing and mixing the materials in a weightless mixer at the manufacturing plant, thereby achieving uniform dispersion mixing and minimizing scattering dust generated during manufacturing and pouring.

In preparing the mortar composition for geopolymer concrete according to the present invention, first, a geopolymer binder is prepared. For the preparation of the geopolymer binder according to the present invention, blast furnace slag powder 57 wt% to 63 wt%, fly ash 14 wt% to 20 wt%, metakaolin 1.5 wt% to 2.5 wt%, calcium hydroxide (Ca(OH) ₂ ) 8 wt% to 12 wt%, and 6 wt% to 10 wt% of a calcium sulfoaluminate-based expansion material are added to a weightless mixer and uniformly mixed to form a primary mixture. At this time, the mixing of the materials is preferably mixed within a time range of 45 seconds to 90 seconds at a low speed of 90 rpm to 100 rpm in a weightless mixer. Next, 2 wt% to 4 wt% of calcium stearate with respect to the primary mixture prepared as described above is additionally added to a weightless mixer and uniformly mixed to prepare a geopolymer binder. At this time, after the input of calcium stearate, the mixing speed of the zero-gravity mixer is mixed at a high speed higher than the mixing speed when preparing the primary mixture. In this, the inorganic material, the alkaline activator, and the expansion material are mixed at high speed with respect to the primary mixture in which the expansion material is uniformly mixed with each other, and the particles of the primary mixture are completely dispersed in the air without gravity in the mixing chamber, and the stearic acid added together This is so that calcium can be sufficiently and uniformly coated on each surface of the particles. At this time, the mixing speed of the weightless mixer after the input of calcium stearate is preferably 150 rpm ~ 800 rpm, which is higher than the mixing speed when preparing the primary mixture, and mixing is performed within a time range of 45 seconds to 90 seconds.

And, with respect to the geopolymer binder prepared in this way, silica sand (SiO ₂ ), a redispersible powder resin, an antifoaming agent, a thickener, a basalt fiber, and a nylon fiber are sequentially added to a gravityless mixer to prepare a mortar composition. More specifically, with respect to the first mixture in which 36 wt% to 45 wt% of the geopolymer binder and 48 wt% to 58 wt% of the silica sand (SiO ₂ ) are uniformly mixed in a weightless mixer, redispersible powder resin 2 wt% to 5 wt% % by weight, 0.1 wt% to 0.3 wt% of an antifoaming agent, and 0.3 wt% to 0.5 wt% of a thickener are added and uniformly mixed to form a secondary mixture, and 0.5 wt% to 1.5 wt% of basalt fiber with respect to this secondary mixture and 0.3 wt% to 0.4 wt% of nylon fiber are additionally added and uniformly mixed to prepare a mortar composition for geopolymer concrete according to the present invention. Mixing of the materials in a zero-gravity mixer is made for a total of about 3 minutes at a low speed of 60 rpm to 90 rpm. At this time, the order of input of the materials ensures uniform mixing between the materials, while it is preferable to put the materials in the order of increasing specific gravity and surface area to minimize scattering dust generated during the pouring process. Binder (about 2.65 ~ 2.95), silica sand (about 2.65 ~ 2.66), redispersible powder resin (about 1.64 ~ 1.85), defoamer (about 1.72 ~ 1.77), thickener (about 1.37 ~ 1.40), bazart fiber (about 1.20 ~ 1.24), and nylon fibers (about 1.14 ~ 1.17) in the order of mixing while input to the zero-gravity mixer. In particular, as a material group considering the similarity of the shape (specific surface area) and specific gravity range of the material, geopolymer binder and silica sand are firstly added, secondly redispersible powder resin, antifoaming agent and thickener are added, and finally A mortar composition is prepared by mixing basalt fibers and nylon fibers while inputting them in a zero-gravity mixer.

On the other hand, the effect of the mortar composition for geopolymer concrete according to the present invention will be described in detail below with the test results for Examples and Comparative Examples.

Example 1

Geopolymer binder 38% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 60% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 3% by weight of calcium stearate}, silica sand (SiO ₂ ) 56% by weight {silica sand (No. 4 yarn) 4 weight%, silica sand (No. 5 yarn) 41 weight%, silica sand (No. 7 yarn) 11 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

Example 2

Geopolymer binder 36% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 60% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 3% by weight of calcium stearate}, silica sand (SiO ₂ ) 58% by weight {silica sand (No. 4 yarn) 4 weight%, silica sand (No. 5 yarn) 42 weight%, silica sand (No. 7 yarn) 12 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

Example 3

Geopolymer binder 45% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 60% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 3% by weight of calcium stearate}, silica sand (SiO ₂ ) 49% by weight {silica sand (No. 4 yarn) 3 weight%, silica sand (No. 5 yarn) 38 weight%, silica sand (No. 7 yarn) 8 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

Comparative Example 1

Portland cement 38% by weight {normal Portland cement (1 type) 38% by weight}, silica sand (SiO ₂ ) 58% by weight {silica sand (No. 4 sand) 5 wt%, silica sand (No. 5 sand) 42 wt%, silica sand (No. 7 sand) 11% by weight}, 3.4% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent with respect to 100 parts by weight of mortar composition, 15% by weight of mixing water is mixed and then poured and cured.

Comparative Example 2

Portland cement 38% by weight {normal Portland cement (1 type) 38% by weight}, silica sand (SiO ₂ ) 56% by weight {silica sand (No. 4 sand) 4 wt%, silica sand (No. 5 sand) 41 wt%, silica sand (No. 7 sand) 11% by weight}, redispersible powder resin 3.5% by weight, thickener 0.4% by weight, antifoaming agent 0.2% by weight, basalt fiber 1.5% by weight, nylon fiber 0.4% by weight relative to 100 parts by weight of the mortar composition, 15 weight of the compounding water After mixing %, pour and cure.

Comparative Example 3

Geopolymer binder 33% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 60% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 3% by weight of calcium stearate}, silica sand (SiO ₂ ) 61% by weight {silica sand (No. 4 yarn) 4.5 weight%, silica sand (No. 5 yarn) 44 weight%, silica sand (No. 7 yarn) 12.5 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

Comparative Example 4

Geopolymer binder 48% by weight {Based on 100% by weight of the total geopolymer binder, blast furnace slag powder 46% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 3% by weight of calcium stearate}, silica sand (SiO ₂ ) 46% by weight {silica sand (No. 4 yarn) 2.5 weight%, silica sand (No. 5 yarn) 35.5 weight%, silica sand (No. 7 yarn) 8 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

The test results for the compressive strength, flexural strength, freeze-thaw resistance, water permeability, water absorption coefficient, surface state (crack), and chemical resistance of Examples 1 to 3 according to the present invention are shown in Table 1 below.

division unit Example 1 Example 2 Example 3 Compressive strength/
flexural strength
(N/mm ² ) 1 day 46.3 / 6.7 45.7 / 6.5 45.8 / 6.5 3 days 51.2 / 7.3 50.8 / 7.1 50.9 / 7.1 7 days 58.3 / 8.3 58.1 / 8.2 58.1 / 8.3 28 days 62.8 / 9.3 62.6 / 9.2 62.7 / 9.2 resistance to freeze-thaw
(Relative dynamic modulus ratio) 98% or more 98% or more 98% or more pitch (g) 8.1 8.0 8.1 Water absorption coefficient (Kg/m ² h ^0.5 ) 0.2 0.2 0.2 Surface condition (crack) radish radish radish chemical resistance Alkali resistance [saturated Ca(OH) ₂ ] (N/mm ² ) 43.2 43.1 43.2 Neutralization resistance (mm) 0.9 0.9 0.9 Chloride ion penetration resistance (Coulombs) 63 52 60

Meanwhile, the test results for the compressive strength, flexural strength, freeze-thaw resistance, water permeability, water absorption coefficient, surface state (crack), and chemical resistance of Comparative Examples 1 to 4 are shown in Table 2 below.

division unit Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Compressive strength/
flexural strength
(N/mm ² ) 1 day 40.5 / 5.0 45.3 / 6.6 40.6 / 5.1 40.9 / 5.1 3 days 43.3 / 5.7 50.8 / 7.1 44.7 / 5.8 44.9 / 6.1 7 days 52.1 / 6.4 57.8 / 8.2 51.2 / 6.8 52.3 / 6.9 28 days 56.3 / 7.4 62.6 / 9.1 56.2 / 7.6 56.7 / 7.9 resistance to freeze-thaw
(Relative dynamic modulus ratio) 89% 97% 96% 96% pitch (g) 11.4 11.1 7.7 7.8 Water absorption coefficient (Kg/m ² h ^0.5 ) 0.3 0.3 0.2 0.2 Surface condition (crack) you radish radish radish chemical resistance Alkali resistance [saturated Ca(OH) ₂ ] (N/mm ² ) 40.1 41.0 43.1 43.0 Neutralization resistance (mm) 0.6 0.8 0.9 0.8 Chloride ion penetration resistance (Coulombs) 52 51 54 54

First, as can be seen in Table 2, in the mortar composition using normal Portland cement (1 type), the reinforcing fibers (basalt fibers, In the case of the mortar composition of Comparative Example 2 containing nylon fiber), it can be seen that the performance is improved in compressive strength/flexural strength, freeze-thaw resistance, and chemical resistance.

And, as confirmed in Tables 1 and 2, in the case of the mortar composition of Example 1 using the geopolymer binder according to the present invention compared to the mortar composition of Comparative Example 2 using normal Portland cement (1 type), CO ₂ Compressive strength/flexural strength is guaranteed and chemical resistance is improved even when a geopolymer binder with a small emission unit is used. It can be seen that there is a significant effect on resistance.

In addition, in the case of the mortar composition of Comparative Example 3 containing less than 36% by weight of the geopolymer binder and the mortar composition of Comparative Example 4 containing more than 45% by weight of the geopolymer binder, the geopolymer binder is contained in an amount of 36% by weight to 45% by weight. Compared to the mortar compositions of Examples 1 to 3 according to the present invention included within the weight% range, there is no significant difference in the effect of improving chemical resistance and reducing water permeability (permeability) and absorption ratio (water absorption coefficient), but compression It can be confirmed that the strength/flexural strength is significantly lowered.

Comparative Example 5

38 wt% of geopolymer binder {based on 100 wt% of the total geopolymer binder, 66 wt% of blast furnace slag powder, 19 wt% of fly ash, 3 wt% of metakaolin, 12 wt% of calcium hydroxide (Ca(OH) ₂ ) }, silica sand (SiO ₂ ) 56 wt% {silica sand (No. 4 yarn) 4 wt%, silica sand (No. 5 yarn) 41 wt%, silica sand (No. 7 yarn) 11 wt%}, redispersible powder resin 3.5 wt%, thickener 0.4 wt% %, antifoaming agent 0.2% by weight, basalt fiber 1.5% by weight, nylon fiber with respect to 100 parts by weight of the mortar composition consisting of 0.4% by weight, after mixing 15% by weight of mixing water, pouring and curing.

Comparative Example 6

Geopolymer binder 38% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 62% by weight, fly ash 18% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Including 8 wt% of expansion material}, silica sand (SiO ₂ ) 56 wt% {silica sand (No. 4 yarn) 4 wt%, silica sand (No. 5 yarn) 41 wt%, silica sand (No. 7 yarn) 11 wt%}, redispersible powder resin With respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, after mixing 15% by weight of mixing water, pouring and curing .

Comparative Example 7

Geopolymer binder 38% by weight {based on 100% by weight of the total geopolymer binder, blast furnace slag powder 58% by weight, fly ash 17% by weight, metakaolin 2% by weight, calcium hydroxide (Ca(OH) ₂ ) 10% by weight, CSA-based Inflatable material 8% by weight, including 5% by weight of calcium stearate}, silica sand (SiO ₂ ) 56% by weight {silica sand (No. 4 yarn) 4 weight%, silica sand (No. 5 yarn) 41 weight%, silica sand (No. 7 yarn) 11 weight% }, with respect to 100 parts by weight of the mortar composition consisting of 3.5% by weight of redispersible powder resin, 0.4% by weight of thickener, 0.2% by weight of antifoaming agent, 1.5% by weight of basalt fiber, and 0.4% by weight of nylon fiber, 15% by weight of mixing water is mixed. After pouring and curing.

The test results for the compressive strength, flexural strength, freeze-thaw resistance, water permeability, water absorption coefficient, surface condition (crack), and chemical resistance of Comparative Examples 5 to 7 are shown in Table 3 below.

division unit Comparative Example 5 Comparative Example 6 Comparative Example 7 Compressive strength/
flexural strength
(N/mm ² ) 1 day 40.2 / 4.9 43.4 / 6.2 44.3 / 6.3 3 days 44.4 / 5.9 48.5 / 6.7 50.1 / 7.1 7 days 52.3 / 7.4 55.3 / 7.8 56.9 / 8.0 28 days 59.8 / 8.8 59.7 / 8.8 60.4 / 8.9 resistance to freeze-thaw
(Relative dynamic modulus ratio) 98% or more 98% or more 98% or more pitch (g) 11.0 11.1 8.0 Water absorption coefficient (Kg/m ² h ^0.5 ) 0.3 0.3 0.2 Surface condition (crack) you radish radish chemical resistance Alkali resistance [saturated Ca(OH) ₂ ] (N/mm ² ) 41.8 42.0 43.3 Neutralization resistance (mm) 0.8 0.9 0.9 Chloride ion penetration resistance (Coulombs) 52 53 53

As can be seen in Tables 1 and 3, in the case of the mortar composition of Comparative Example 6 including the CSA-based expansion material in the geopolymer binder, compared to the mortar composition of Comparative Example 5 not including the CSA-based expansion material, the geopolymer due to drying shrinkage Although there is an effect of preventing cracking of the polymer hardened body and increasing the rapid hardness, the compressive strength/flexural strength is lower than that of the mortar composition of Example 1 according to the present invention using a geopolymer binder further containing calcium stearate together with a CSA-based expansion material. It can be confirmed that it is not only low, but also does not bring the effect of reducing the permeability (permeability) and absorption ratio (water absorption coefficient).

On the other hand, in the case of the mortar composition of Comparative Example 7 comprising calcium stearate in excess of 4 wt% in the geopolymer binder, Examples 1 to Examples according to the present invention containing calcium stearate in the range of 2 wt% to 4 wt% Compared to the mortar composition of No. 3, there is no significant difference in the effects of improvement of chemical resistance and reduction of water permeability (permeability) and absorption ratio (water absorption coefficient), but the reactivity (hydration and polymerization reaction) of inorganic materials by alkaline activator is lowered As a result, it can be confirmed that the problem of lowering the compressive strength and flexural strength as a binder occurs.

1 is a flowchart illustrating a method of repairing/reinforcing a concrete structure using a mortar composition for geopolymer concrete according to the present invention, and FIG. A drawing showing a cross-section of a concrete structure.

1 and 2, the concrete structure repair/reinforcement method using the mortar composition for geopolymer concrete according to the present invention removes the deteriorated surface from the surface (construction surface) of the concrete structure 100 to be repaired/reinforced. a step (S110); Chipping or high-pressure washing the surface of the concrete structure 100 from which the deteriorated surface is removed and removing dust (S120); Installing the reinforcing material 20 manufactured by processing the basalt fiber on the surface of the cleaned and dust-removed concrete structure 100 (S130); Pouring the mortar 40 prepared by mixing the mortar composition for geopolymer concrete according to the present invention in water (mixed water) on the surface of the concrete structure 100 in which the reinforcement 20 is installed (S140); Curing the mortar 40 poured on the surface of the concrete structure 100 (S150); Including the step (S160) of applying a pollution-resistant neutralizing organic-inorganic composite protective agent.

First, the step (S110) of face-treating the surface (construction surface) of the concrete structure 100 in step S110 is arranged by removing the aged or deteriorated surface of the concrete structure 100 using a grinder, a breaker, or the like.

In step S120 of chipping or high-pressure water washing and dust removal, foreign substances, dust, dust, etc. on the surface of the concrete structure 100 faceted in step S110 are removed by water sprayed from the high-pressure washer or air sprayed from the air compressor. go through the cleaning process. When foreign substances or residues on the surface of the concrete structure 100 are removed with a high-pressure washer, it is preferable to remove the remaining moisture. At this time, when damage such as drop-off occurs on the surface of the concrete structure 100, the surface treatment can be performed by filling the mortar 10 in which the earthquake-resistant mortar composition according to the present invention is mixed with water. In some cases, in order to reinforce the aged concrete structure 100 before installing the reinforcement 20 and pouring the mortar 40 in which the mortar composition for geopolymer concrete according to the present invention is mixed with water, for example, permeable sphere protection The reinforcing agent 30 such as a primer may be applied with a brush, roller, spray, etc. depending on the field situation.

In step S130 of installing the reinforcing material 20 to the concrete structure 100, the earthquake-resistant reinforcing material 20 manufactured by processing the basalt fiber (basalt fiber) is attached to the surface of the concrete structure 100 and fixed by driving a fixing pin. Install the reinforcing material (20). At this time, as shown in FIG. 3 , the reinforcing material 20 installed on the surface of the faceted concrete structure 100 is a mesh ( Mesh)-shaped grid mesh reinforcement 20 . The member manufactured by processing basalt fiber has very large tensile and compressive strength than general rebar, does not corrode, and has excellent workability due to low weight, is eco-friendly and inexpensive, so it is used as a reinforcement or substitute for rebar. It is used as a material for the repair/reinforcement method. More specifically, the grid reinforcing material 20 is a member 20a processed by twisting a yarn bundle made of basalt fiber (basalt fiber) crossed in a plurality of columns and rows, and arranged in a plurality of columns and rows The intersecting portions are fixed so that the rectangular opening has a plurality of columns and rows. The grid reinforcing material 20 is configured by fixing portions that intersect each other with respect to the rebars arranged in a plurality of columns and rows, and thus has a rectangular shape no matter where a force is applied in any direction up, down, left, or right of the grid reinforcing material 20 . Since the members fixed to each other act as a buffer to distribute the force, the fixed installation is easy and durability can be improved. Such a grid mesh reinforcement 20 may have a grid shape (30 mm X 30 mm) as shown in FIG. 4 . In the present invention, the grid mesh reinforcement 20 installed on the surface of the concrete structure 100 is coated with urea liquid resin on the surface of the member 20a processed by twisting the basalt fiber bundle as shown in FIG. 3 , and urea After dispersing and attaching dried silica sand particles to the surface of the resin-coated member 20a, the urea resin is cured to have the uneven structure 20b made of silica sand on the surface. Since the dry silica sand particles are dispersedly attached to form the outer peripheral surface of the concave-convex structure, the surface area in contact with the mortar in which the mortar composition for geopolymer concrete according to the present invention is mixed with water is enlarged compared to a general basalt fiber member having a smooth outer peripheral surface. In addition, since the silica sand particles dispersedly attached to the surface of the grid mesh reinforcement 20 are also used as a material of the mortar composition for geopolymer concrete according to the present invention, the heterogeneity between the outer skin layer of the basalt fiber member 20a and the mortar decreases Therefore, when the mortar 40 is poured on the grid reinforcing material 20, the adhesive force between the mortar 40 and the grid reinforcing material 20 is greatly improved, and even after a long period of time after curing the mortar 40, the grid reinforcing material 20 is not separated from the mortar 40, the adhesion to the concrete structure 100, and the flexural strength and durability are improved. On the other hand, in some cases, as a member made of basalt fiber constituting the grid reinforcing material 20, as shown in FIG. The core 22 is wetted and hardened, and the outer peripheral surface of the core material that has passed through the drawing die is wound along a spiral path with a filament 23 made by soaking a strand made of basalt fiber in resin and hardening. , It is also possible to use a rebar (Reinforcing bar, 21) surrounding the spiral filament 23 and forming the coated outer layer 24.

In the step S140 of pouring the mortar 40 on the surface of the concrete structure 100 in which the reinforcement 20 is installed, the mortar composition for geopolymer concrete according to the present invention is poured with water (for example, when working at 0 ° C. or less, 28 ° C. ~ Mixing water heated to 32°C) and pouring it on the surface of the concrete structure by plastering, shotcrete, or injection method to construct the mortar (40) layer. The coating of the mortar 40 layer is such that the grid mesh reinforcement 20 is completely submerged according to the thickness of the grid mesh reinforcement 20 installed on the surface of the concrete structure 100 . In order to prepare the mortar for pouring into the conventional concrete structure 100, the powder type Portland cement, which is the main cause of dust generation during the process of mixing the mortar composition and water (mixing water) in an electric drum mixer at a site such as a downtown area, is Since the mortar composition contained in the mortar composition is removed from the work bag and added, there are frequent complaints due to the deterioration of the air quality of the downtown air used by multiple people due to the generation of dust at the site, and the loss of fine powder in the mortar composition reduces the quality and the health of workers. Although there was a problem of lowering efficiency, in the present invention, by replacing the existing Portland cement with a geopolymer binder coated with calcium stearate, oil, etc. during the manufacturing process, workability and environment-friendliness by reducing dust can be brought about. have.

Curing the mortar 40 constructed in the step S150 for at least 3 days (S150).

Finally, after the step S150 of curing the mortar 40, the antifouling neutralizing organic-inorganic composite protective agent 50 is applied (S160). The anti-pollution neutralizing organic-inorganic composite protective agent 50 has a thickness of 2 mm or less and is applied 1 or 2 times thinly with a brush, roller, spray, etc. It is preferable to use a neutralizing protective agent 50 suitable for repair/reinforcement even for structures installed in the More specifically, as the antifouling neutralizing protective agent 50 used in the present invention, 32 wt% to 48 wt% of a silane-based resin, 8 wt% to 12 wt% of a color pigment, 3 wt% to 7 wt% of a phosphorescent pigment, and an extender pigment 8% to 12% by weight, antibacterial agent 0.5% to 1% by weight, dispersant 0.1% to 0.2% by weight, antifoaming agent 0.2% to 0.3% by weight, anti-cracking agent 0.5% to 1.5% by weight, and the balance is water Penetrating nano-silane based coatings may be used. The silane-based resin is an emulsion resin in which a silane and an acrylic resin are mixed, and the silane is preferably an alkylalkoxysilane. Alkylalkoxysilane has a siloxane bond (Si-O-Si) as a main chain, and at least one alkyl group having 6 to 20 carbon atoms and at least one alkoxy group selected from methoxy, ethoxy and prooxy is attached to a silicon atom. directly bound compounds. The hydrolyzable alkoxy group of alkylalkoxysilane is hydrolyzed by moisture in water, air, and moisture adsorbed on the surface of the concrete structure to produce silanol (Si-OH). Silanol penetrates into the concrete structure and forms an oxane bond (Si-O-M) between the inorganic material (M-OH) and the inorganic material to form a metal oxide. This prevents the penetration of water and air. At this time, when the alkyl group directly bonded to the silicon atom has less than 6 carbon atoms, the alkylalkoxysilane may exhibit extremely high hydrolysis and volatility, and the alkylalkoxysilane molecular moiety is too close to the substrate surface immediately after application to the substrate surface. It reacts quickly, which may delay permeability. Accordingly, the water-repellent component is imparted only to the surface of the concrete structure. In addition, when the alkyl group directly bonded to the silicon atom has more than 20 carbon atoms, the molecular weight is too large, so that it is not easily penetrated into the concrete structure. Therefore, in the present invention, it is most preferable to use trialkoxy-monoalkyl silane as a nano-sized alkylalkoxysilane that does not have a large molecular weight and can easily penetrate into the concrete structure, for example, amino Propyltrimethoxysilane, aminopropyltriethoxysilane, glycidoxypropyltrimethoxysilane, glycidoxypropyltriethoxysilane, isocyanatopropyltrime One or two or more alkylalkoxysilanes selected from isocyanatopropyltrimethoxysilane, isocyanatopropyltriethoxysilane, mercaptopropyltrimethoxysilane, and mercaptopropyltriethoxysilane can be mixed and used. Here, the silane-based copolymer using alkylalkoxysilane as a monomer is formed by mixing an alkylalkoxysilane monomer with an organic solvent (one or a mixture of two or more selected from toluene, xylene, ethanol, methanol, and tetrahydrofuran). It can be obtained by dispersing a metal catalyst (one type or an alloy of two or more types selected from silver, zinc, and cesium) in one dispersion system, polymerization, and filtering through a nylon filter of #110 mesh to remove impurities. The silane-based resin is preferably used within the range of 32 to 48% by weight based on the total weight of the antifouling neutralizing protective agent 50 . When used in less than 32% by weight, there may be problems with the breakdown and fluidity of the coating film, and when used in excess of 48% by weight, problems with excessive gloss and flow may occur.

Concrete after repair/reinforcement construction and curing using the mortar composition for geopolymer concrete according to the present invention is KS F 4042 for repair of concrete structures in compressive strength, flexural strength, adhesion strength (standard condition), and water absorption coefficient As it satisfies all the quality standards of polymer cement mortar, the conventional Portland cement, which emits a large amount of CO ₂ during production, uses inorganic materials (blast furnace slag, fly ash, metakaolin), which are industrial by-products with low CO ₂ emission units. By replacing it with a geopolymer binder, an environmentally friendly repair/reinforcement method for concrete structures can be performed.

In addition, in terms of flexural strength (breaking load), the flexural strength (9.2 to 9.3 N/mm ² based on 28-day curing) when repair/reinforcement construction and curing were performed using the mortar composition for geopolymer concrete according to the present invention is compared Since it is significantly superior to the flexural strength (7.4 N/mm ² ) when construction and curing are performed using the conventional mortar composition containing Portland cement according to Example 1, Suitable.

In addition, in the case of performing repair/reinforcement construction and curing using the mortar composition for geopolymer concrete according to the present invention in terms of resistance to freezing and thawing, water permeability (permeability), absorption ratio (water absorption coefficient), and chemical resistance, Since it is significantly superior to the case of carrying out construction and curing using the conventional mortar composition containing Portland cement according to Comparative Example 1, it prevents deterioration of rigidity and durability due to whitening and salt damage, and has waterproofness and workability It can provide an excellent repair/reinforcement method for concrete structures.

In addition, according to the present invention, an environmentally friendly mortar composition with strong resistance to earthquakes when constructing walls, slabs, girders, bridges, piers, etc. of concrete structures or repairing/reinforcing existing structures due to excellent flexural strength and adhesion strength, and It is possible to provide an earthquake-resistant repair/reinforcement method for a concrete structure using an earthquake-resistant reinforcement material processed with basalt fiber.

In addition, according to the present invention, an earthquake-resistant repair/reinforcement method for a concrete structure using an eco-friendly earthquake-resistant mortar composition that has excellent constructability and durability and is inexpensive to produce by using industrial waste (blast furnace slag, fly ash, metakaolin) can provide

As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms are used herein, they are used only for the purpose of describing the present invention, and are not used to limit the meaning or scope of the present invention described in the claims. Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be defined by the technical spirit of the appended claims.

100: concrete structure 20: grid mesh reinforcement
20a: basalt fiber rebar 20b: silica sand uneven structure

Claims (13)

As a concrete structure repair/reinforcement method using a mortar composition for geopolymer concrete,
removing the deteriorated surface of the concrete structure;
chipping or high pressure water washing and dust removal;
Installing a reinforcing material manufactured by processing basalt fibers in the concrete structure;
Geopolymer binder 36wt% to 45wt%, silica sand 48wt% to 58wt%, redispersible powder resin 2wt% to 5wt%, thickener 0.3wt% to 0.5wt%, and defoaming agent 0.1wt% to 0.3wt% pouring a mortar prepared by mixing a mortar composition for geopolymer concrete containing water with water on the surface of the concrete structure in which the reinforcing material is installed;
curing the mortar; and
Including the step of applying a pollution-resistant neutralizing organic-inorganic composite protective agent,
The reinforcing material is a reinforcing material of a mesh shape having a plurality of columns and rows in which a member manufactured by processing a basalt fiber bundle is arranged in a lattice form in a plurality of columns and rows, and an intersecting portion is fixed, and a square-shaped opening has a plurality of columns and rows, The surface of the member manufactured by processing the basalt fiber bundle is coated with a liquid urea resin, and silica sand is dispersed and attached to the surface of the member coated with the urea resin, and then the urea resin is cured to form irregularities with silica sand on the surface A concrete structure repair/reinforcement method using a mortar composition for geopolymer concrete, characterized in that it is a reinforcing material having a structure. The method according to claim 1,
The geopolymer binder comprises 57 wt% to 63 wt% of blast furnace slag powder, 14 wt% to 20 wt% fly ash, 1.5 wt% to 2.5 wt% metakaolin, 8 wt% to 12 wt% calcium hydroxide A method of repairing/reinforcing concrete structures using a mortar composition for geopolymer concrete. 3. The method according to claim 2,
The geopolymer binder is a concrete structure repair / reinforcement method using a mortar composition for geopolymer concrete, characterized in that it further comprises 6% to 10% by weight of a calcium sulfoaluminate-based expansion material. 4. The method according to claim 3,
The geopolymer binder is a concrete structure repair / reinforcement method using a mortar composition for geopolymer concrete, characterized in that it further comprises 2 wt% to 4 wt% of calcium stearate. 5. The method according to claim 4,
The mortar composition for geopolymer concrete is characterized in that it further comprises 0.5% to 1.5% by weight of basalt fiber and 0.3% to 0.5% by weight of nylon fiber. Method. 6. The method of claim 5,
The basalt fiber is a basalt fiber having a length of 3 mm, and the nylon fiber is a hydrophilic nylon fiber having a length of 6 mm, a concrete structure repair/reinforcement method using a mortar composition for geopolymer concrete. 7. The method of claim 6,
As the silica sand, 2 wt% to 4 wt% of silica sand (No. 4 sand) having a size of 1.2mm to 1.5mm, 38 wt% to 42 wt% of silica sand (No. 5 sand) having a size of 0.7mm to 1.2mm, 0.1mm to 0.35mm silica sand (No. 7) A concrete structure repair/reinforcement method using a mortar composition for geopolymer concrete, characterized in that it contains 8% to 12% by weight. 6. The method of claim 5,
The geopolymer binder is 57 wt% to 63 wt% of the blast furnace slag powder, 14 wt% to 20 wt% of fly ash, 1.5 wt% to 2.5 wt% of metakaolin, 8 wt% to 12 wt% of calcium hydroxide, and With respect to the first mixture in which 6 wt% to 10 wt% of a calcium sulfoaluminate-based expansion material is mixed uniformly at a low speed of 90 rpm to 100 rpm in a zero-gravity mixer, 2 wt% to 4 wt% of the calcium stearate is additionally added and 150 rpm Concrete structure repair/reinforcement method using a mortar composition for geopolymer concrete, characterized in that it is manufactured by high-speed mixing at ~ 800rpm. 9. The method of claim 8,
The mortar composition for geopolymer concrete is a primary mixture in which 36% by weight to 45% by weight of the geopolymer binder and 48% by weight to 58% by weight of the silica sand are uniformly mixed in a weightless mixer at 60rpm to 90rpm, the redispersibility 2% by weight to 5% by weight of the powder resin, 0.1% by weight to 0.3% by weight of the antifoaming agent, and 0.3% by weight to 0.5% by weight of the thickener are added and uniformly mixed to form a secondary mixture, Concrete structure repair/reinforcement using a mortar composition for geopolymer concrete, characterized in that 0.5 wt% to 1.5 wt% of basalt fiber and 0.3 wt% to 0.4 wt% of the nylon fiber are additionally added and uniformly mixed Method. delete delete delete delete

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