KR101609697B1 - Cement mortar compositions un-split in water and repairing method of concrete structure therewith - Google Patents
Cement mortar compositions un-split in water and repairing method of concrete structure therewith Download PDFInfo
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- KR101609697B1 KR101609697B1 KR1020150114419A KR20150114419A KR101609697B1 KR 101609697 B1 KR101609697 B1 KR 101609697B1 KR 1020150114419 A KR1020150114419 A KR 1020150114419A KR 20150114419 A KR20150114419 A KR 20150114419A KR 101609697 B1 KR101609697 B1 KR 101609697B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2652—Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2641—Polyacrylates; Polymethacrylates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
- C04B24/383—Cellulose or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
- C04B28/082—Steelmaking slags; Converter slags
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/16—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing anhydrite, e.g. Keene's cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
The present invention relates to a cement mortar composition for underwater immobilization for repairing and reinforcing a concrete structure and a method of repairing a concrete structure using the same. More particularly, the present invention relates to a cement mortar composition for repairing and reinforcing concrete structures, The present invention relates to a cement mortar composition for underwater nonfiltration which can form a uniform cured structure in water by suppressing the separability of materials in which constituent materials are separated by self weight difference by exhibiting high viscosity while exhibiting copper, and to a repair method of a concrete structure using the same will be.
When cracks occur in the concrete due to deterioration in the concrete structure, the compressive strength of the concrete and the tensile strength of the reinforcing bars gradually decrease over time, and the concrete exposed through the cracks is neutralized and corrosion of the reinforcing bars occurs. If these rebar corrosion phenomena become severe, the concrete structure may eventually collapse. Therefore, if the concrete structure deteriorates and cracks are generated, it is necessary to repair the deteriorated part quickly. In this regard, Korean Patent No. 10-0220563 discloses an underwater concrete structure repair reinforcement using epoxy mortar and concrete as main materials. However, since epoxy mortar repair reinforcement is low in strength and can not be integrated with underwater concrete, there is a problem that it is not possible to construct a perfect repair reinforcement part. In order to compensate for this, Korean Patent Registration No. 10-0384942 discloses an underwater concrete structure reinforcement method in which a repair and reinforcement member composed of an angle member and a curved plate member is provided around a damaged portion of an underwater concrete structure, and an epoxy mortar is injected to cure have. However, this method has the additional disadvantage of using a low-durability epoxy mortar as well as a complicated and costly operation because additional reinforcement members are required.
On the other hand, in order to reinforce the concrete structure in water, it is required to have water-insolubility in which the constituent materials of the mortar composition are not separated. For water insolubility, there is a demand for workability that can be compromised by its own fluidity, and viscosity and material separation resistance to prevent material scattering.
In case of general cement mortar, it is necessary to use a thickener for underwater insolubilization, which has higher fluidity, viscosity and material separation resistance than conventional concrete with insolubility in water, and it is required to manufacture stable cement mortar using this thickener.
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SUMMARY OF THE INVENTION The object of the present invention is to provide a cement mortar which is capable of suppressing the separability of a material in which constituent materials are separated by their own weight difference by placing a cement mortar in the water, The present invention provides a cement mortar composition for insolubilization in water, which can form a uniform cured structure even in the presence of water.
Another object of the present invention is to provide a cement mortar which is capable of exhibiting high viscosity while exhibiting high fluidity without being scattered in water even when cement mortar is poured in water and suppressing the material separability in which the constituent materials are separated by their own weight difference The present invention provides a method of repairing a concrete structure using a cement mortar composition for underwater immiscible separation which can form a constant cured structure in water.
The performance improving agent comprises 40 to 98% by weight of a polyacrylamide, 5 to 75% by weight of an inorganic binder, 10 to 85% by weight of a fine aggregate, 0.01 to 15% A cement mortar for underwater fire separation comprising 1 to 30% by weight of methyl methacrylate-vinyl chloride, 0.1 to 20% by weight of sodium acrylate, 0.1 to 20% by weight of hydroxylethylcellulose and 0.01 to 10% by weight of sodium oleate Lt; / RTI >
The performance improving agent may further include 0.01 to 10% by weight of vinyl acetate-butyl maleate.
The performance improving agent may further include 0.01 to 10% by weight of styrene-butadiene-acrylic acid.
In addition, the performance improving agent may further include 0.01 to 5% by weight of a fluidizing agent.
In addition, the performance improving agent may further include 0.01 to 5% by weight of a defoaming agent.
Wherein the inorganic binder comprises from 6000 to 8000 cm 2 / g of micro cement, from 30 to 80% by weight of blast furnace slag, from 5 to 30% by weight of blast furnace slag, from 1 to 30% by weight of calcium aluminate, from 1 to 20% by weight of anhydrous gypsum, 0.1 to 15% by weight of zeolite, 0.1 to 15% by weight of zeolite, 0.1 to 15% by weight of wood ash, and 0.01 to 5% by weight of manganese sulfate.
The inorganic binder may further contain 0.1 to 5% by weight of a high-performance water reducing agent.
The inorganic binder may further include 0.01 to 5% by weight of chalcocite.
The inorganic binder may further contain 0.01 to 5% by weight of a retarder.
In addition, the inorganic binder may further include 0.01 to 5% by weight of titanium oxide.
The fine aggregate may include 45 to 99% by weight of silica silica, 0.1 to 35% by weight of dolomite, and 0.1 to 25% by weight of elvan.
The present invention also relates to a method of manufacturing a concrete structure, comprising the steps of crushing and chipping impurities, run-in, and deteriorated portions of a concrete structure with a crusher, a hand water jet, a high-pressure washer, etc. and a step of applying a primer or blooming- A step of repairing the cross section by placing the cement mortar composition for separating underwater fire on the primer or the result of blooming and anti-rust treatment, and a step of finishing the restored result by surface finishing, A method of repairing a concrete structure comprising the steps of:
At this time, when water flows through the concrete structure, there is no need for a treatment process for applying and finishing the primer or blooming treatment, anti-rust treatment, and durability improving surface protective agent.
The primer treatment may use at least one material selected from polyurethane emulsion, epoxy emulsion, styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, and methyl methacrylate.
The endurance performance improving surface protective agent may be at least one selected from the group consisting of polyurethane emulsion, epoxy emulsion, styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methyl methacrylate, silane compound and modified sodium silicate compound .
According to the cement mortar composition for separating underwater fire of the present invention, it is possible to provide an inorganic binder which is excellent in strength, durability, stain resistance, flame retardancy and acid resistance, and a performance improving agent excellent in adhesion, salt resistance, neutralization resistance, durability, water tightness, It has excellent strength and durability, especially antifouling property, acid resistance and watertightness by using fine aggregate which is excellent in material adsorption / decomposition ability and abrasion resistance. Therefore, underground structures such as sewer pipes, sewage culverts, manholes, sewage water treatment plant constructions, hydraulic constructions, exponential structures, It is possible to prevent corrosion of concrete caused by chemical erosion of water tunnel, precast product, and the like, so that the maintenance cost to be used can be remarkably reduced.
Further, according to the present invention, since it has excellent compressive strength, bending strength and adhesion strength, it can be easily applied not only to a sewage facility having a large amount of acidic substances, a concrete index structure in contact with water but also to various existing methods, It is possible to mechanize construction such as construction, and it has many advantages such that it is excellent in separation resistance of material, thereby preventing loss of material and providing economy of construction.
In addition, it is possible to form a stable concrete structure in water by giving superior fluidity, cohesive force and material separation prevention property to existing cement mortar products. In addition, it is possible to form a concrete structure in water and to prevent collision of water by excellent cohesive force, Can be achieved.
Hereinafter, preferred embodiments according to the present invention will be described in detail. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.
The cement mortar composition for underwater immiscible separation according to a preferred embodiment of the present invention comprises 5 to 75% by weight of an inorganic binder, 10 to 85% by weight of a fine aggregate, 0.01 to 15% by weight of a performance improving agent and 0.1 to 15% by weight of water.
The inorganic binder having excellent acid resistance and saltiness is blended in an amount of from 6000 to 8000 cm 2 / g micro cement 30 to 80 wt%, blast furnace slag 5 to 30 wt%, calcium aluminate 1 to 30 wt%, anhydrous gypsum 1 to 20 wt% 0.1 to 15% by weight of cristobalite, 0.1 to 15% by weight of zeolite, 0.1 to 15% by weight of wood ash and 0.01 to 5% by weight of manganese sulfate.
The baine of 6000 to 8000 cm 2 / g micro cement is preferably made of cement which conforms to the KS standard. The ordinary Portland cement is preferably contained in an amount of 30 to 80% by weight based on the inorganic binder.
The blast furnace slag is used for improving latent hydraulic characteristics, long-term strength development and durability. When the weight ratio of the blast furnace slag powder is increased, the early strength is lowered, but the long-term strength development and durability are increased. The blast furnace slag is preferably contained in an amount of 5 to 30% by weight based on the inorganic binder. If the content of the blast furnace slag exceeds 30 wt%, the durability improves but the early strength development deteriorates. If the content of the blast furnace slag is less than 5 wt%, the effect of improving long-term strength and durability is insufficient.
The calcium aluminate is used for improving early strength, chemical resistance, especially acid resistance. The calcium aluminate is preferably contained in an amount of 1 to 30% by weight based on the inorganic binder. If the content of calcium aluminate is less than 1% by weight, the effect of improving early strength, chemical resistance and acid resistance may be insignificant. If the calcium aluminate content is less than 1% by weight, If it exceeds 30% by weight, good physical properties can be obtained due to quick curing characteristics, but the production cost is high and it is not economical.
The anhydrous gypsum (CaSO 4 ) reacts with the components in the cement, in particular C 3 A ( 3 CaO.Al 2 O 3 ), to initially produce ettringite (AFt phase, C 3 A · 3 CaSO 4 · 32 H 2 O) The produced etrinzate decreases in its amount as the hydration proceeds, or a part thereof is transferred to monosulfate (AFm phase, C 3 A · CaSO 4 · 12H 2 O). When a large amount of anhydrous gypsum is added as in the present invention, etrinzite is sufficiently generated from the beginning to densify the structure of the cement, thereby increasing penetration resistance to chloride ions in the early age. In addition, in the case of general cement, etrinite is produced only at the initial stage, but since the amount of gypsum is sufficiently added in the case of the inorganic binder of the present invention, there is a certain amount of etrinite in the long- Zites are also generated continuously. The nitrite produced in this way increases the penetration resistance to chlorides even in the long term by densely filling the pores in the concrete structure. The anhydrous gypsum is preferably contained in an amount of 1 to 20% by weight based on the inorganic binder. If the content of the gypsum anhydrite is less than 1 wt%, the durability improvement effect may be insufficient. When the content of the gypsum anhydrite is more than 20 wt%, the reactivity decreases and the early strength development and water resistance deteriorate.
Cristobalite has a tetragonal structure with a high SiO2 content and high pozzolanic reactivity and is used to improve strength, water resistance, salt resistance and freeze-thaw resistance. The cristobalite is preferably contained in an amount of 0.1 to 15% by weight based on the inorganic binder. If the content of the cristobalite is less than 0.1% by weight, the effect of improving water resistance, flame resistance and freeze-thaw resistance may be insignificant. If the content of cristobalite is more than 15% by weight,
The zeolite acts as a sorbent material as a porous inorganic material. The zeolite is preferably contained in an amount of 0.1 to 15% by weight based on the inorganic binder. When the zeolite weight ratio is increased, the viscosity improving performance is exhibited. If the zeolite content is less than 0.1 wt%, the viscosity improving effect may be weak. When the zeolite content is more than 15 wt% It is not economical due to high manufacturing cost.
The wood ash promotes potential hydraulic properties, long-term strength development and durability, and is used to obtain adsorptive decomposition effects of pollutants with porosity. When the weight ratio of the wood ash is increased, the early strength is lowered, but the long-term strength development and durability are improved and the pollutant adsorption decomposition effect is increased. The wood ash is preferably contained in an amount of 0.1 to 15% by weight based on the inorganic binder. When the content of the wood ash is less than 0.1% by weight, the strength, durability, and pollutant adsorption decomposition improving effect may be insufficient. When the content of the wood ash exceeds 15% by weight, workability and strength are lowered.
The manganese sulfate is used for improving the antifouling and antirust effect. The manganese sulfate is preferably contained in an amount of 0.01 to 5% by weight based on the inorganic binder. If the content of manganese sulfate is less than 0.01% by weight, the effect of improving antifouling and antirust is insufficient. If the content of manganese sulfate exceeds 5% by weight, the performance improvement effect is not significant and the economical efficiency is low.
The inorganic binder may further include a high-performance water reducing agent. The high performance water reducing agent is used to reduce the water-cement ratio of the inorganic binder to improve strength and durability. The high-performance water reducing agent may be a polycarbonate-based, melamine-based or naphthalene-based fluidizing agent. The melamine- or naphthalene-based water reducing agent is less effective for improving strength and durability than the polycarboxylic acid-based water reducing agent, has a small effect of reducing the water-cement ratio, and has a disadvantage . Therefore, it is preferable to use a high-performance water-repellent agent based on a polycarboxylic acid, and the water-reducing agent is preferably contained in an amount of 0.1 to 5% by weight based on the inorganic binder.
In addition, the inorganic binder may further include nitrate nitrate. The acetic acid nitrate is used to prevent corrosion of reinforcing bars in concrete. The acetic acid chalite is preferably contained in an amount of 0.01 to 5% by weight based on the inorganic binder.
In addition, the inorganic binder may further include a retarder. The retarder can be used to ensure workability for a certain period of time and to delay rapid curing. The retarder is preferably contained in an amount of 0.01 to 5% by weight based on the inorganic binder. As the delaying agent, generally well known substances can be used. Examples thereof include saccharides such as glucose, glucose, texturin and dextran, acids or salts thereof such as gluconic acid, malic acid, citric acid and citric acid, Or a salt thereof, a phosphonic acid or a derivative thereof, and a polyhydric alcohol such as glycerin.
The inorganic binder may further include titanium oxide. The titanium oxide can be used for antiseptic and antimicrobial functions. The titanium oxide is preferably contained in an amount of 0.01 to 5% by weight based on the inorganic binder. When the weight ratio of the titanium oxide is increased, the antifouling performance is exhibited. When the content of the titanium oxide is less than 0.01 wt%, the effect of preservation, antibacterial and antifouling performance may be weak. When the content of the titanium oxide is more than 5 wt% Is not economical because the intensity is lowered and the manufacturing cost is increased.
The fine aggregate preferably comprises 45 to 99% by weight of silica silica, 0.1 to 35% by weight of dolomite and 0.1 to 25% by weight of elvan. In general, aggregate is classified into fine aggregate and coarse aggregate. Coarse aggregate means aggregate exceeding 5 mm in diameter. Hereinafter, fine aggregate refers to aggregate having a particle size of 5 mm or less in comparison with coarse aggregate. It is advantageous in that it is excellent in heat insulation and strength and excellent in durability against acidity and antifouling property by using a fine aggregate containing dolvite having excellent effect of far infrared ray effect and excellent decomposition effect of adsorption of pollutants.
It is preferable that the silica silica has a particle size of from 4 to 8 (0.05 to 2.0 mm). If the particle size of the silica silica is larger than the above range, the fluidity of the cement mortar composition for separating the water from the water may be lowered. If the particle size is smaller than the above range, the workability of the cement mortar composition for separating water from the water may be decreased. Silica silicate silica is preferably contained in an amount of 45 to 99% by weight based on the fine aggregate.
The dolomite has a specific gravity of 2.9 and a hardness of about 4. The dolomite is excellent in strength, abrasion resistance and fire resistance and is used to improve strength, abrasion resistance and fire resistance in a cement mortar composition. The dolomite is preferably contained in an amount of 0.1 to 35% by weight based on the fine aggregate.
The elvan is characterized by a fine porous structure, which absorbs, decomposes and removes water vapor, contaminants, organic substances and germs. When immersed in water, the main components such as trace elements, iron, magnesium, calcium and germanium are eluted, (COD) and biological oxygen demand (BOD) are lowered to prevent the decay of water and to give vitality to living organisms. It is changed into active water to control the year and hardness, It acts to neutralize the soil. Especially because it is composed of multi-elements and porous materials, it acts to remove water impurities and odors and to prevent water from decaying by ionizing and radiating action. The elvan stone is preferably contained in an amount of 0.1 to 25% by weight based on the fine aggregate.
The performance improving agent is used to improve the pot life, workability, elasticity, flowability, strength, adhesive strength, acid resistance, heat resistance and durability, and is composed of 40 to 98 wt% of polyacrylamide, 1 to 30 of methyl methacrylate- 0.1 to 20% by weight of sodium acrylate, 0.1 to 20% by weight of hydroxylethylcellulose, and 0.01 to 10% by weight of sodium oleate.
The performance improving agent is preferably contained in an amount of 0.01 to 15% by weight based on the cement mortar composition for separating underwater fire. If the content of the performance improver exceeds 15% by weight, the viscosity is lowered and the material separation is likely to occur, and the hydration reaction may be delayed to lower the early compression strength development and reduce the price competitiveness. If the content of the performance improving agent is less than 0.01% by weight, the effect of improving the working time, workability, elasticity, fluidity, strength, adhesive strength, acid resistance, heat resistance and durability may be small.
The polyacrylamide is used for improving moisture retention, water retention and adhesion. When the content of the polyacrylamide is less than 40% by weight, the effect of improving the moisture retention, water retention, adhesion, and durability of the polyacrylamide is insufficient. On the other hand, When the content of the polyacrylamide is more than 98% by weight, it is difficult to expect further improvements in water retention, moisture retention, adhesion and durability.
The methyl methacrylate-vinyl chloride is used for improving the adhesion and the heat resistance. It is preferable that the methyl methacrylate-vinyl chloride is contained in an amount of 1 to 30% by weight based on the performance improving agent. If the methyl methacrylate-vinyl chloride content exceeds 30% by weight, the cement mortar composition If the content of methyl methacrylate-vinyl chloride is less than 1% by weight, the workability of the cement mortar composition for separating underwater fire is improved but the effect of improving the adhesive strength and heat resistance may be weak.
The sodium acrylate is used to improve the workability and ductility by lowering the viscosity of the cement mortar composition for separating underwater fire. In addition, the above-mentioned sodium acrylate is excellent in acid resistance and alkali resistance and has an effect of improving the strength. If the content of the sodium acrylate exceeds 20% by weight, the performance of the cement mortar composition for separating underwater fire may be improved but the price competitiveness may be deteriorated. If the content of the sodium acrylate is less than 0.1 wt%, the effect of improving the acid resistance and strength may be weak.
The hydroxylethylcellulose is used to improve water retention and adhesion of the cement mortar composition for underwater fire separation. It is preferable that the hydroxyl ethylcellulose is incorporated in an amount of 0.1 to 20 wt% based on the performance improving agent. If the content of the hydroxylethylcellulose exceeds 20 wt%, the performance of the cement mortar composition But the price competitiveness may be deteriorated. If the content of hydroxylethylcellulose is less than 0.1% by weight, the effect of improving water retention and adhesion may be weak.
The sodium oleate is used to improve the water resistance of the cement mortar composition for underwater fire separation. The sodium oleate is preferably contained in an amount of 0.01 to 10% by weight based on the performance improving agent. If the content of sodium oleate exceeds 10% by weight, further improvement in waterproof performance can not be expected and cost competitiveness is lowered. If the content of sodium oleate is less than 0.01% by weight, the effect of improving the waterproof performance is insufficient.
The performance improving agent may further comprise vinyl acetate-butyl maleate. The vinyl acetate-butyl maleate is used to improve the adhesion, durability and heat resistance of the cement mortar composition for underwater fire separation. The vinyl acetate-butyl maleate content is preferably 0.01 to 10 wt% based on the performance improving agent. If the content of the vinyl acetate-butyl maleate exceeds 10 wt%, the performance of the cement mortar composition for underwater separation However, when the content of the vinyl acetate-butyl malate is less than 0.01% by weight, the workability of the cement mortar composition for separating underwater fire is improved but the effect of improving the adhesive strength, durability and heat resistance may be weak.
In addition, the styrene-butadiene-acrylic acid is used to improve the water retention as well as the workability by lowering the viscosity of the cement mortar composition for separating underwater fire. In addition, the styrene-butadiene-acrylic acid is excellent in alkali resistance and has an effect of improving the strength. If the styrene-butadiene-acrylic acid content is more than 10% by weight, the performance of the cement mortar composition for underwater separation is improved. If the content of styrene-butadiene-acrylic acid is less than 0.01% by weight, the workability of the cement mortar composition for separating underwater fire is improved but the effect of improving the alkali resistance and water retention can be weak.
In addition, the performance improving agent may further include a fluidizing agent for reducing the water-cement ratio to improve fluidity, strength and durability. The fluidizing agent is used to improve the strength and durability by reducing the water-cement ratio and to secure the fluidity of the performance improving agent. When the fluidizing agent is added to the performance improving agent, the water-cement ratio is reduced. The fluidizing agent is preferably contained in an amount of 0.01 to 5% by weight based on the performance improving agent. The fluidizing agent may be a polycarbonate-based, melamine-based or naphthalene-based fluidizing agent. However, naphthalene-based and melamine-based compounds may have lower strength and lower workability and potlife time than polycarbonate- It is preferable to use a polycarboxylic acid-based fluidizing agent which does not lower the workability and the pot life.
In addition, the performance improving agent may further include a defoaming agent for removing bubbles in the performance improving agent to increase strength and durability. The antifoaming agent is used to remove bubbles in the performance improving agent to increase strength and durability. In addition, when the antifoaming agent is added to the performance improving agent, the air entraining effect is imparted to improve the workability and the pot life. The antifoaming agent is preferably contained in an amount of 0.01 to 5% by weight based on the performance improving agent. Examples of the defoaming agent include alcohol defoaming agents, silicone defoaming agents, fatty acid defoaming agents, oil defoaming agents, ester defoaming agents and oxyalkylene defoaming agents. Examples of the silicone defoaming agent include dimethyl silicone oil, polyorganosiloxane, and fluorosilicone oil. Examples of the fatty acid defoaming agent include stearic acid and oleic acid. Examples of the oil-based antifoaming agents include kerosene, animal and plant oil, and castor oil. Examples of the ester type antifoaming agents include solitol trioleate, glycerol monoricinolate, and the like. Examples of the oxyalkylene antifoaming agents include polyoxyalkylene, acetylene ethers, polyoxyalkylene diisocyanate esters, and polyoxyalkylene alkylamines. Examples of the alcohol-based defoaming agent include glycol.
Hereinafter, a method for manufacturing a cement mortar composition for separating underwater fire according to a preferred embodiment of the present invention will be described.
The cement mortar composition for separating underwater fire according to a preferred embodiment of the present invention comprises 5 to 75 wt% of the inorganic binder, 10 to 85 wt% of the fine aggregate, and 0.01 to 15 wt% of the performance improver in a vacuum type forced mixer Mixing the mixture with water, adding 0.1 to 15% by weight of water, and mixing the mixture with a forced mixer or a continuous mixer for a predetermined time (for example, 1 to 10 minutes).
Hereinafter, a method of repairing a concrete structure using the above-described cement mortar composition for separating underwater fire is presented. Hereinafter, the concrete structure refers to concrete structures such as sewage pipes, sewage culverts and related sewer manholes, related structures such as chemical plants, food factories, housing floors and the like, marine concrete structures, underwater concrete structures, road surfaces, bridge bridges, Concrete slabs of bridges, bridges, and other structures, which are used as a means of including structures made of concrete.
A method of repairing a concrete structure according to a preferred embodiment of the present invention includes the steps of crushing and chipping a concrete structure with impurities, runtans, and deteriorated parts with a crusher, a hand water jet, a high pressure washer, Treating the exposed reinforcing bar with an anti-rust treatment, and restoring a cross-section by placing the cement mortar composition for separating underwater fire on the primer or blooming treated or anti-rust treated product, and finishing the recovered product, And a step of finishing the surface of the concrete structure by applying an improved surface protective agent.
At this time, when water flows through the concrete structure, there is no need for a treatment process for applying and finishing the primer or blooming treatment, anti-rust treatment, and durability improving surface protective agent.
As the primer treatment, one or more materials selected from a polyurethane emulsion, an epoxy emulsion, a styrene-butadiene latex, a polyacrylic ester, ethylvinylacetate, and methyl methacrylate may be used, but the present invention is not limited thereto.
The endurance performance-improving surface protecting agent may be at least one selected from the group consisting of polyurethane emulsion, epoxy emulsion, styrene-butadiene latex, polyacrylic ester, ethylvinyl acetate, methyl methacrylate, silane compound and modified sodium silicate compound , But is not limited thereto.
Hereinafter, embodiments of the cement mortar composition for separating underwater fire according to the present invention will be more specifically shown and the present invention is not limited by the following embodiments.
≪ Example 1 >
40 wt% of inorganic binder, 50 wt% of fine aggregate and 6 wt% of performance improver were premixed in a vacuum type forced mixer, 4 wt% of water was added, and the mixture was stirred with a forced mixer for 2 minutes to prepare a cement mortar composition .
At this time, the inorganic binder is composed of 41% by weight of Blaine 6000 ~ 8000 cm 2 / g microcement, 15% by weight of blast furnace slag, 15% by weight of calcium aluminate, 10% by weight of anhydrous gypsum, 5% by weight of Cristobalite, 5% by weight of woody ash, 1% by weight of manganese sulfate, 1% by weight of acetic acid chalmate, 0.5% by weight of a high-performance water reducing agent, 0.5% by weight of retarder and 1% by weight of titanium oxide. The high performance water reducing agent used was a polycarboxylic acid based high performance water reducing agent. As the retarder, citric acid was used.
The fine aggregate used was a mixture of 80% by weight of silica silica, 10% by weight of dolomite and 10% by weight of elvanite.
The performance enhancer was prepared by mixing 93% by weight of polyacrylamide, 2% by weight of methyl methacrylate-vinyl chloride, 1% by weight of sodium acrylate, 1% by weight of hydroxylethylcellulose, 1% by weight of sodium oleate, 0.5% by weight of water, 0.5% by weight of a styrene-butadiene-acrylic acid, 0.5% by weight of a fluidizing agent and 0.5% by weight of an antifoaming agent. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent. The defoamer was a silicone defoamer.
≪ Example 2 >
40 wt% of inorganic binder, 50 wt% of fine aggregate and 6 wt% of performance improver were premixed in a vacuum type forced mixer, 4 wt% of water was added, and the mixture was stirred with a forced mixer for 2 minutes to prepare a cement mortar composition .
At this time, the inorganic binder is composed of 41% by weight of Blaine 6000 ~ 8000 cm 2 / g microcement, 15% by weight of blast furnace slag, 15% by weight of calcium aluminate, 10% by weight of anhydrous gypsum, 5% by weight of Cristobalite, 5% by weight of woody ash, 1% by weight of manganese sulfate, 1% by weight of acetic acid chalmate, 0.5% by weight of a high-performance water reducing agent, 0.5% by weight of retarder and 1% by weight of titanium oxide. The high performance water reducing agent used was a polycarboxylic acid based high performance water reducing agent. As the retarder, citric acid was used.
The fine aggregate used was a mixture of 80% by weight of silica silica, 10% by weight of dolomite and 10% by weight of elvanite.
The performance enhancer was composed of 88% by weight of polyacrylamide, 3% by weight of methyl methacrylate-vinyl chloride, 2% by weight of sodium acrylate, 2% by weight of hydroxylethylcellulose, 2% by weight of sodium oleate, 1% by weight of styrene, 1% by weight of styrene-butadiene-acrylic acid, 0.5% by weight of a fluidizing agent and 0.5% by weight of an antifoaming agent. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent. The defoamer was a silicone defoamer.
≪ Example 3 >
40 wt% of inorganic binder, 50 wt% of fine aggregate and 6 wt% of performance improver were premixed in a vacuum type forced mixer, 4 wt% of water was added, and the mixture was stirred with a forced mixer for 2 minutes to prepare a cement mortar composition .
At this time, the inorganic binder is composed of 41% by weight of Blaine 6000 ~ 8000 cm 2 / g microcement, 15% by weight of blast furnace slag, 15% by weight of calcium aluminate, 10% by weight of anhydrous gypsum, 5% by weight of Cristobalite, 5% by weight of woody ash, 1% by weight of manganese sulfate, 1% by weight of acetic acid chalmate, 0.5% by weight of a high-performance water reducing agent, 0.5% by weight of retarder and 1% by weight of titanium oxide. The high performance water reducing agent used was a polycarboxylic acid based high performance water reducing agent. As the retarder, citric acid was used.
The fine aggregate used was a mixture of 80% by weight of silica silica, 10% by weight of dolomite and 10% by weight of elvanite.
The performance enhancer was composed of 82 wt% of polyacrylamide, 4 wt% of methyl methacrylate-vinyl chloride, 3 wt% of sodium acrylate, 3 wt% of hydroxylethylcellulose, 3 wt% of sodium oleate, 2% by weight of a styrene-butadiene-acrylic acid, 0.5% by weight of a fluidizing agent and 0.5% by weight of a defoaming agent were mixed and used. The fluidizing agent used was a polycarboxylic acid-based fluidizing agent. The defoamer was a silicone defoamer.
Comparative Examples which can be compared with the embodiments of the present invention are shown in order to more easily grasp the characteristics of Examples 1 to 3. Comparative Examples 1 and 2 to be described later are examples of the common cement A mortar composition and a polymer-cement mortar composition.
≪ Comparative Example 1 &
40% by weight of ordinary Portland cement, 50% by weight of fine aggregate and 10% by weight of water were stirred with a forced mixer to prepare a usual cement mortar composition.
≪ Comparative Example 2 &
40% by weight of Portland cement, 50% by weight of fine aggregate and 6% by weight of polyacrylamide were premixed with a vacuum type forced mixer, 4% by weight of water was added and stirred with a forced mixer for 2 minutes to prepare a polymer cement mortar composition Respectively.
The following test examples show experimental results in which the characteristics according to the present invention are compared with the characteristics of Comparative Example 1 and Comparative Example 2 in order to more easily grasp the characteristics of Examples 1 to 3 according to the present invention .
≪ Test Example 1 >
Flow tests (flowability at non-hitting) were measured according to the method defined in KS L 5220 for the cement mortar composition for underwater fire separation prepared in Examples 1 to 3 and Comparative Examples 1 to 3.
The mortar slurry was hand - kneaded by hand, and the underwater preparation specimen was prepared by free - falling after installing a 10cm mold under the water surface. The results are shown in Table 1.
As shown in Table 1, the flowability of the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 at non-strike was higher than that of Comparative Example 1 and Comparative Example 2, showing excellent flowability And it was found. In addition, in Comparative Example 1, material separation occurred, but in Examples 1 to 3, material separation did not occur, and it was found that the water separation performance was excellent.
≪ Test Example 2 &
In order to compare the physical properties of the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 and the cement mortar composition prepared in Comparative Examples, it was confirmed that the cement mortar composition prepared according to Examples 1 to 3 The cement mortar composition for separating underwater fire and the cement mortar composition prepared in Comparative Example 1 and Comparative Example 2 were subjected to a compressive strength test by KS F 2476 (Test Method of Polymer Cement Mortar) Respectively. Also, the bending strength test was performed by KS F 2476, and the results are shown in Table 3 below. The adhesive strength was measured by KS F 2476, and the results are shown in Table 4 below.
(㎏f / cm 2)
(㎏f / cm 2)
(㎏f / cm 2)
As shown in Tables 2 to 4, the compression, flexure and adhesive strength of the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 were the same as those of the cement mortar prepared in Comparative Example 1 and Comparative Example 2 Was significantly higher than that of the composition.
It was confirmed that the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 was much superior in strength to the cement mortar composition prepared in Comparative Examples.
≪ Test Example 3 >
The cement mortar composition for the separation of waterborne fire produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were measured for KS F 2476 by using KS F 2476, Respectively.
As shown in the above Table 5, the cement mortar composition for underwater fire separation prepared according to Examples 1 to 3 had a reduced shrinkage and shrinkage as compared with the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, It was confirmed that there was an effect.
<Test Example 4>
The measurement results of the water absorption ratio according to the method described in KS F 2476 according to the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 are shown in the following Table 6 shows the results. If the water absorption rate is high, if the impurities or water penetrate into the concrete, the porosity increases in the interior of the concrete, thereby causing a problem of causing damage to the structure.
As shown in Table 6, the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 had a lower water absorption rate than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2.
≪ Test Example 5 >
The cement mortar composition for separating underwater fire produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were tested by KS F 2476, Respectively.
As shown in Table 7 above, the cement mortar composition for the separation of waterborne fumes produced according to Examples 1 to 3 had a lower chloride ion penetration depth than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 It was confirmed that the resistance to salting was high.
≪ Test Example 6 >
The cement mortar composition for separation of underwater fire and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 prepared according to Examples 1 to 3 were tested by KS F 2476, Respectively.
As shown in Table 8, the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 had less neutralization penetration depth than the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, And that the resistance to
≪ Test Example 7 >
The cement mortar composition for separation of underwater fire produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Examples 1 and 2 were tested according to the Japanese Industrial Standards (Test Method for Chemical Resistance by Immersion of Concrete in Solution) , The aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide was immersed in the test solution for 28 days, and the measurement results of the chemical resistance test are shown in Table 9 below.
(%)
As shown in Table 9 above, the cement mortar composition for underwater fire separation prepared according to Examples 1 to 3 had a weight change rate with respect to chemical resistance as compared with the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 And the resistance to chemical resistance was high.
<Test Example 8>
The cement mortar composition for separating underwater fire produced according to Examples 1 to 3 and the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2 were measured according to the method specified in KS F 2456 Are shown in Table 10 below. Freezing and thawing means that the water absorbed in the capillary is frozen and melted in the concrete. If the freezing and thawing is repeated, fine cracks are generated in the concrete structure and the durability is lowered. Table 10 shows the durability indexes of the respective examples and comparative examples according to the freeze-thaw resistance test.
As shown in Table 10, since the durability index of the cement mortar composition for separating underwater fire produced according to Examples 1 to 3 is higher than that of the cement mortar composition prepared according to Comparative Example 1 and Comparative Example 2, The durability is improved.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.
Claims (15)
5 to 75% by weight of an inorganic binder, 10 to 85% by weight of a fine aggregate, 0.01 to 15% by weight of a performance improving agent, and 0.1 to 15%
The performance improving agent may be selected from the group consisting of 40 to 98% by weight of polyacrylamide, 1 to 30% by weight of methyl methacrylate-vinyl chloride, 0.1 to 20% by weight of sodium acrylate, 0.1 to 20% by weight of hydroxylethylcellulose, To 10% by weight,
The inorganic binder
Blaine 6000 to 8000 cm 2 / g Micro-cement 30 to 80 wt.% Blast furnace slag 5 to 30 wt.% Calcium aluminate 1 to 30 wt.% Anhydrous gypsum 1 to 20 wt.% Cristobalite 0.1 to 15 wt. By weight of zeolite, 0.1 to 15% by weight of zeolite, 0.1 to 15% by weight of wood ash and 0.01 to 5% by weight of manganese sulfate.
The performance-
And 0.01 to 10% by weight of vinyl acetate-butyl maleate.
The performance-
Styrene-butadiene-acrylic acid in an amount of 0.01 to 10% by weight based on the total weight of the cement mortar composition.
The performance-
Wherein the cement mortar composition further comprises 0.01 to 5% by weight of a fluidizing agent.
The performance-
And 0.01 to 5% by weight of an antifoaming agent.
The inorganic binder
And 0.1 to 5% by weight of a high-performance water reducing agent.
The inorganic binder
And 0.01 to 5% by weight of acetic acid chalmate.
The inorganic binder
Retardant cement mortar composition according to claim 1, further comprising 0.01 to 5% by weight of a retarder.
The inorganic binder
And 0.01 to 5% by weight of titanium oxide, based on the total weight of the cement mortar composition.
The fine aggregate
A cement mortar composition for separating underwater fire, comprising 45 to 99% by weight of silica silica, 0.1 to 35% by weight of dolomite and 0.1 to 25% by weight of elvan.
Crushing and chipping an impurity, run-in, or deteriorated portion of a concrete structure with a crusher, hand water jet, or high pressure washer;
Rinsing the removed portion with primer or blooming and exposed reinforcing bar;
Placing a cement mortar composition for separating underwater fire on the primer or blooming treated and anti-rusted product, and recovering a section; And
And a step of finishing the surface of the recovered product by applying a surface protecting agent to improve the durability of the surface of the recovered product.
When water flows into the concrete structure,
A step of crushing and chipping the impurity, run-in, or deteriorated portion of the concrete structure with a crusher, a hand water jet, or a high-pressure washer, A method of repairing a concrete structure, comprising performing a step of repairing a section by installing a cement mortar composition for separating underwater fire and performing a step of finishing the surface of the restored resultant product by applying a durable performance improving surface- .
In the primer or blooming treatment and the anti-rust treatment process,
Wherein the primer treatment uses at least one material selected from the group consisting of polyurethane emulsion, epoxy emulsion, styrene-butadiene latex, polyacrylic ester, ethylvinylacetate and methyl methacrylate.
In the step of applying and finishing the durable performance improving surface protective agent,
The endurance performance-improving surface protective agent may be at least one selected from the group consisting of polyurethane emulsion, epoxy emulsion, styrene-butadiene latex, polyacrylic ester, ethylvinylacetate, methylmethacrylate, silane compound and modified sodium silicate compound. Repair method of concrete structure.
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| CN116655293A (en) * | 2023-05-09 | 2023-08-29 | 重庆建筑科技职业学院 | Novel self-healing cement mortar and preparation method thereof |
| CN116655293B (en) * | 2023-05-09 | 2024-01-02 | 重庆建筑科技职业学院 | Self-healing cement mortar and preparation method thereof |
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