KR102084250B1 - Repair and reinforcement method of underwater structure with separable cement mortar composition and sewage culvert using the same - Google Patents

Abstract

The present invention relates to an underwater non-separable cement mortar composition and an underwater structure repair and reinforcement method including a sewage culvert using the same, intended to maintain a repair and reinforcement effect for a long time while improving long-term durability. According to the present invention, the underwater non-separable cement mortar composition comprises cement, an aggregate, a concrete reinforcing agent, a reinforcing fiber, a calcium aluminoferrite-based expanding agent, a powdery thickener, a polycarboxylic acid-based water reducing agent, a silicone-based antifoaming agent, a polyether-based antifoaming agent, and a gas foaming material.

Description

Repair and reinforcement method of underwater structure with separable cement mortar composition and sewage culvert using the same}

The present invention relates to an underwater non-separable cement mortar composition and an underwater structure repair and reinforcement method including a sewage culvert using the same, and in particular, it is used as a mortar material for repairing and reinforcing a sewage culvert and underwater structure submerged in water, and is not quick and hard. The present invention relates to an underwater non-separable cement mortar composition that improves long-term durability by improving physical properties, such as compressive strength, while maintaining the required characteristics of separability and high fluidity, and a repair and reinforcement method for an underwater structure including sewage culvert using the same.

In general, sewage culverts are buried underground to direct wastewater and sewage to a sewage treatment plant. Concrete is mainly used as its material, and its cross-section is round, rectangular or elliptical.

Sewage culverts buried in the basement are leaked due to aging over time, cross section scour by flow velocity, cracks due to impact, and expansion and contraction of the joints. The situation is being repaired and reinforced.

Particularly, in order to reinforce the submerged floor of the sewer culvert, physical properties such as quick-hardening, water inseparability and high fluidity of the reinforcing mortar composition are additionally required, and research to satisfy these properties continues. However, the development of a mortar composition capable of stably repairing and reinforcing a sewer culvert while having high strength and non-shrinking property has been poorly supported.

In addition, the mortar used in the sewage culvert has been used in a manner that minimizes contact with water, but in the case of sewage or underground structures, it is not possible to prevent contact with the initial water pouring in this way, and there is a limit to the method of blocking water. After pouring, there is a problem in that quality deterioration and environmental pollution occur due to material separation.

Registered Patent No. 10-1609697 Registered Patent No. 10-1927403 Registered Patent No. 10-0952458

Accordingly, the present invention was devised to solve the above-mentioned problems, and it is necessary to provide the properties of fast-hardness, material non-separability and high fluidity as mortar materials in repair and reinforcement of sewage culverts and underwater structures submerged in water. While maintaining, it improves the physical properties such as compressive strength, improves long-term durability, and strengthens the adhesion strength in sewage culverts to maintain the maintenance-reinforcing effect for a long time. The purpose of the present invention is to provide an underwater non-separable cement mortar composition, which has advantages such as constructability and eco-friendliness due to its excellent filling properties, and a repair and reinforcement method for an underwater structure including a sewage culvert using the same.

Water non-separable cement mortar composition according to the present invention for achieving the above object is 100 parts by weight of cement; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent consisting of lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; It is characterized by consisting of 0.0005 to 0.003 parts by weight of a gas foaming material made of any one of aluminum powder, nitrogen gas foaming material, and peroxidation material.

In addition, the underwater structure repair and reinforcement method using a sewage culvert using the water-inseparable cement mortar composition according to the present invention for achieving the above object is 100 parts by weight of cement; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent consisting of lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; As a method of repairing and reinforcing sewage culverts using a non-water separable cement mortar composition composed of 0.0005 to 0.003 parts by weight of a gas releasing material composed of any one of aluminum powder, nitrogen gas foaming material, and peroxidation material, chipping the deterioration part of sewage culvert Step (S 1) to; Removing the rust of the rebar at the deterioration site (S 2); Washing the rust removal portion of the rebar with high pressure water at high pressure (S 3); Base material consisting of 10% by weight of zinc oxide (ZnO), 10% by weight of titanium (TiO ₂ ), 10% by weight of aluminum oxide (Al ₂ O ₃ ), and 70% by weight of sulfur resin on the surface of the deteriorated part of the high-pressure washed sewage culvert Step of applying (S 4); It characterized in that it consists of a step (S 6) of forming a finishing layer by mixing a non-separable cement mortar composition in water on the base material and applying it in a predetermined thickness and a predetermined shape.

As described above, the underwater structure repair and reinforcement method including the water-inseparable cement mortar composition and sewage culvert using the same has the following effects.

First, the present invention improves long-term durability by improving physical properties such as compressive strength while maintaining required properties of fast-hardness, material non-separability and high fluidity as a mortar material in repairing and reinforcing submerged sewage culverts and underwater structures. At the same time, by strengthening the adhesion strength in the sewage culvert, the maintenance reinforcement effect can be maintained for a long time, and the material has excellent separation property and resistance to filling in water, so it has advantages such as workability and eco-friendliness. .

Second, the present invention, by applying a mortar composition to the surface of the submerged submerged or underwater concrete of the aged sewage culvert, has a high-strength 35MPa has an effect of mitigating against external shock.

Fourth, the present invention is advantageous in preventing salt damage of sewage culvert because there is no alkali aggregate reaction due to no reaction to calcium chloride, and there is no chemical reaction in strong acidity such as sulfuric acid, which is advantageous for sewage treatment plants, wastewater treatment plants, sewage pipeline repairs, etc. It secures perfect water tightness that water cannot penetrate because there are no voids. Due to the elasticity of the elastic resin, shock, vibration absorption, and crack generation are suppressed, which is advantageous for structures such as bridges. It is resistant to UV rays and has strong abrasion resistance due to weathering.

Fifth, the present invention has an effect of not exhibiting excitation or peeling after construction because of excellent adhesion to cross-section repair and reinforcement of sewage culverts as well as other underwater concrete structures.

Sixth, the present invention has an advantage in that it is possible to apply to a concrete structure having a complicated shape by improving the speed of curing of the waterproofing material, and curing at room temperature does not require heating, and can be applied to a wide range by a spray method.

Seventh, the present invention can be applied to the flooring of concrete structures such as buildings exposed to moisture, ultraviolet rays, ozone, etc. according to the natural environment requirements in the atmosphere, public parking lots, hardened at room temperature and does not require heating, and is constructed in a wide range by spraying This has the possible advantage.

1 is a process diagram showing the process of reinforcing and repairing sewage culvert using the water-inseparable cement mortar composition in accordance with the present invention,
Figure 2 is a cross-sectional view showing a construction state to repair and reinforce the sewage culvert using the water-inseparable cement mortar composition in accordance with the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[Water-inseparable cement mortar composition]

Water-inseparable cement mortar composition in water according to the present invention is 100 parts by weight of cement; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent consisting of lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; Made of any one of aluminum powder, nitrogen gas foam material, and peroxide material It is composed of 0.0005 to 0.003 parts by weight of gas foaming material.

That is, the non-water-removable cement mortar composition according to the present invention is a mortar in which cement, aggregate, concrete reinforcing agent, reinforcing fiber, expander, thickener, water reducing agent, antifoaming agent and gas foaming material are mixed at a certain ratio.

Here, the cement is ordinary, crude steel, super-steel, low-temperature and medium-heat various types of Portland cement, such as Portland cement, blast furnace slag, fly ash, or a mixture of silica mixed cement, limestone powder or blast furnace slag slag fine powder And mixed filler cements and eco-friendly cements made from various industrial wastes as main raw materials.

In the present invention, it is preferable to use portland cement or crude steel portland cement in terms of initial strength developability or material separation resistance.

In addition, the aggregate uses fine aggregate, and the fine aggregate plays an important role in terms of reducing heat generation and dimensional change and securing durability. Specifically, in addition to steel sand, mountain sand and sea sand, Cassa-based fine aggregate, Limestone-based fine aggregate, blast furnace crushed slag-based fine aggregate, and recycled aggregate may be mentioned, but is not particularly limited.

The particle size of the fine aggregate is preferably 1.2 to 3.0 in the granulation rate (F.M.), and particularly preferably 1.5 to 2.7.

If it is less than 1.2, good fluidity may not be obtained, and if it exceeds 3.0, there is a possibility that the inseparability in water falls and the strength when polluted in water or poured in water may decrease.

 The amount of fine aggregate is preferably 25 to 100 parts by weight of 100 parts by weight of cement.

If less than 25 parts by weight, when a large amount is poured, thermal cracking may occur, and if it exceeds 100 parts by weight, there is a fear that sufficient compressive strength may not be obtained.

And, the concrete strengthening agent is composed of lithium silicate or sodium silicate.

Here, the lithium silicate is used as a surface strengthening agent for structures made of cement materials such as cement, mortar, concrete, and calcium silicate.

In particular, the lithium silicate penetrates into the concrete surface and chemically reacts with the free alkali components of the concrete to strengthen the concrete.

In addition, the sodium silicate has a variety of sodium metasilicate (NaSiO), orthohydrate sodium orthosilicate (NaSiO), sodium disilicate (NaSiO), depending on the composition, but usually means sodium metasilicate.

There are also hydrates, but the anhydride is made by heating and melting a mixture of quartz and sodium carbonate to 1,000 ° C to solidify.

Sodium metasilicate is soluble in water and the aqueous solution is hydrolyzed to become alkaline.

Therefore, it can be quantified using an acid in a lean aqueous solution.

Meanwhile, the reinforcing fiber is composed of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), and PET fiber.

Here, such as the glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), PET fiber is a very high tensile strength, no elasticity, and is a non-corrosive fiber .

In particular, when FRP and CFRP are used, they do not rust as in the case of using cement-based reinforcing bars, and there is no deterioration in strength and durability due to fatigue, so that the target strength or durability can be secured in the long term.

Carbon fiber is a fiber made by heating and carbonizing an organic fiber in an inert gas.

Cellulose, acrylic, vinylon, and pitch are raw materials.

In general, a hexagonal ring of carbon is formed in succession to form a layered lattice, and has a metallic luster and has a black or gray color.

The strength is 10 to 20 g / d, and the specific gravity is 1.5 to 2.1.

It has excellent heat resistance and impact resistance, strong chemical resistance, and high resistance to pests.

It is lighter than metal (aluminum) because the molecules such as oxygen, hydrogen, and nitrogen escape during the heating process, reducing weight. On the other hand, it has superior elasticity and strength compared to metal (iron).

In addition, the barzal fiber is an inorganic fiber made of filament yarn having a diameter of 9 to 20 by spinning by centrifugal force by melting basalt to 1,500.

It is non-toxic due to its health-healing functions such as the release of far infrared rays and negative ions and eco-friendly, non-flammable, heat-resistant, sound-absorbing, dust-proof, corrosion-resistant to acids and alkalis, corrosion resistance to water, abrasion resistance, and lightweight high-strength properties that are used across industries It is a textile material.

The glass fiber is a mineral fiber in the form of a molten glass fiber, there are long fibers and short fibers depending on the application.

Glass fiber withstands high temperature, does not burn, does not absorb, has little hygroscopicity, does not corrode because of its chemical durability, has strong strength, especially tensile strength, has low elongation, has great electrical insulation, and wear resistance This is small, brittle and broken, and its specific gravity is 2.2 times that of nylon and 1.7 times that of cotton.

In addition, the thinner the glass fiber, the greater the tensile strength and the smaller the thermal conductivity.

On the other hand, the aramid fiber is a polyamide (polyamide) -based protein thread, used to make synthetic fibers such as nylon (nylon) is a fiber that is resistant to heat and has increased properties that do not burn well.

Further, if the swelling agent produces ethrinite, calcium hydroxide by hydration, a preferred calcium sulfoaluminate-based swelling agent, a calcium alumino-ferrite-based swelling agent, a quick lime-based swelling agent, and a gypsum-based swelling agent are selected, and one or more of them are selected. This is usable and more preferably a calcium armino ferrite-based expander in fluid retention performance.

 The degree of powder of the expander is preferably 2,000 to 8,000 cm 2 / g at the specific surface area of the brain, and more preferably 2,500 to 6,000 cm 2 / g.

If it is less than 2,000 cm2 / g, bridging may occur, and if it exceeds 8,000 cm2 / g, there is a fear that proper expansion rate may not be obtained and fluidity may deteriorate.

Here, the amount of the expanding agent is preferably 0.75 to 7.5 parts by weight based on 100 parts by weight of cement.

If it is less than 0.75 parts by weight, it is difficult to obtain an appropriate expansion property in the cured body obtained by mixing with water, and when it exceeds 75 parts by weight, the amount of expansion becomes large and there is a fear that the cured body is destroyed.

And, the powdery thickener uses a thickener to impart non-separability in water, but contains an alkylarylsulfonate and an alkylammonium salt.

The thickener used in the present invention is a powdery thickener containing an alkylarylsulfonic acid salt and an alkylammonium salt, and when both of them come into contact with water, they form a string-shaped micelle by association by intermolecular interaction, and the rheology is achieved by the structure. It is to express the modifying effect.

The mixing ratio of the alkylarylsulfonate salt and the alkylammonium salt is not particularly limited as long as it can form a string-shaped micelle.

Usually, the range of 1/10 to 10/1 is good in the weight ratio of alkylaryl sulfonate / alkyl ammonium salt as an active ingredient.

The powdered thickener is preferably used in an amount of 0.075 to 0.25 parts by weight based on 100 parts by weight of cement.

If it is less than 0.07515 parts by weight, it may be difficult to obtain proper water non-separability, and if it exceeds 0.25 parts by weight, sufficient fluidity cannot be obtained due to high viscosity, and there is a concern that the hose may be clogged or the filling property may be damaged when pumping.

In addition, in the present invention, a polycarboxylic acid-based water reducing agent is used to impart fluidity.

Although the form of the polycarboxylic acid-based water reducing agent is both liquid and powder, the powder is used because the cement composition is blended as a dry blend.

 The use of the polycarboxylic acid-based water reducing agent is preferably 0.025 to 0.15 parts by weight based on 100 parts by weight of the cement.

If it is less than 0.025 parts by weight, proper fluidity may be difficult to obtain, and if it exceeds 0.15 parts by weight, there is a fear that a large number of bubbles or a setting time may be delayed when mixing cement mortar with water.

In addition, in the present invention, a silicone antifoaming agent using dimethyl cyclohexane as an active ingredient is used for the purpose of defoaming entrained air and preventing a decrease in strength from entrainment.

Although the form is both liquid and powdery as in the case of water reducing agents, the powdery one is used because the cement composition is blended as a dry blend.

Here, the amount of the silicone antifoaming agent used is preferably 0.005 to 0.05 parts by weight relative to 100 parts by weight of cement.

If the amount is less than 0.005 parts by weight, entrained air may not be removed, compressive strength may not be improved, and even if it is used in excess of 0.05 parts by weight, there is no increase in the effect of reducing the amount of air, as well as inferiority in water and contamination of water quality or pouring in water When doing so, there is a concern that the strength may decrease.

Further, in the present invention, a polyether-based antifoaming agent is used for the purpose of improving fluidity retention performance.

Although the form is both liquid and powdery as in the case of water reducing agents, the powdery one is used because the cement composition is blended as a dry blend.

Here, the amount of the polyether-based antifoaming agent is preferably 0.001 to 0.05 parts by weight relative to 100 parts by weight of cement.

If it is less than 0.001 parts by weight, the effect of improving the fluidity retention performance may be lost, and if it exceeds 0.05 parts by weight, the viscosity becomes small, the water inseparability decreases, and there is a concern that the strength when polluted or poured in water decreases.

On the other hand, in the case of using the water-inseparable cement mortar composition in the present invention, a gas foam material is used to integrate with the mortar composition or to suppress the uncured mortar from sinking or contracting.

Here, the gaseous foaming material is a scaled aluminum powder surface-treated with stearic acid or an aluminum powder produced by an atomizing method, or a material that foams nitrogen gas in an aluminum atmosphere, such as azo compounds, nitroso compounds and hydrazine derivatives, Percarbonates such as sodium percarbonate, potassium percarbonate, and ammonium percarbonate, percarbonates, sodium perborate or sodium perborate or sodium percarbonate, sodium percarbonate, sodium percarbonate, percarbonate, percarbonate, sodium percarbonate, sodium percarbonate and the like The amount of sodium carbonate gas foaming material used is preferably 0.0005 to 0.003 parts by weight of any one of aluminum powder, nitrogen gas foaming material, and peroxide, relative to 100 parts by weight of cement.

If it is less than this range, settlement may not be prevented, and if it exceeds this range, the amount of gas foaming increases, and the expansion rate of the cured body becomes too large, leading to a decrease in strength of the cured body.

Meanwhile, 10 parts by weight of the base material is added and mixed with respect to 100 parts by weight of the mortar composition.

Here, the base material is composed of 10% by weight of zinc oxide (ZnO), 10% by weight of titanium (TiO ₂ ), 10% by weight of aluminum oxide (Al ₂ O ₃ ), and 70% by weight of sulfur resin.

In particular, the sulfur resin is composed of sulfur and urethane acrylate resin in a weight ratio of 1: 1.

That is, the base material is composed of zinc oxide (ZnO), titanium (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and sulfur resin.

Here, the zinc oxide (ZnO) is a compound of oxygen and zinc (ZnO), also referred to as zinc or zinc bag.

Naturally, it is calculated as red zinc ore, and the pure one is obtained by thermal decomposition of acetate, basic carbonate, etc., is a light white powder, crystal is hexagonal, and when heated to 300 ℃, it turns yellow, but when cooled, it returns to white.

It is hardly soluble in water, soluble in dilute acid or concentrated alkali, and is also used as a catalyst.

In addition, the titanium (TiO ₂ ) is atomic number 22, specific gravity 45, melting point 1800 ° C., paramagnetic, and has very high hardness and softness. Its strength is almost the same as that of carbon steel, and its specific strength is less than that of iron, so it is about twice that of iron, and its thermal conductivity and thermal expansion coefficient are also small.

In addition, the aluminum oxide (Al ₂ O ₃ ) is a compound of oxygen and aluminum, and is also referred to as alumina. Chemical formula Al ₂ O ₃ , molecular weight 10194, melting point 2090 ℃. It is a solid, colorless crystal powder with high melting point and is a raw material for making aluminum. Corundum is pure alumina from nature, and ruby and sapphire are red and blue alumina due to impurities.

It is also calculated as the main component of bauxite. It is not soluble in water and is a positive oxide, but it is not soluble in acid when heated hard. In addition to aluminum electrolytic, catalyst, catalyst carrier and abrasive, it is widely used in IC packages and ceramic wiring boards.

On the other hand, the sulfur resin is composed of sulfur and urethane acrylate resin in a weight ratio of 1: 1.

Here, the urethane acrylate resin is a hybrid (hybride) resin having both the properties of the urethane and the acrylate.

The urethane acrylate resin is generally prepared by a polymerization reaction between a urethane prepolymer and a hydroxy alkyl acrylate.

The urethane prepolymer is formed by a polymerization reaction of polyol and isocyanate, and its types are various.

Further, examples of the hydroxy alkyl acrylate include methyl methacrylate (MMA), 2-hydroxy ethylmethacrylate, and n-butyl acrylate. Oil-based resin; Water-soluble resins such as 22% butyl acrylate monomer, 22% methyl methacrylate monomer, 1% Ethorylated Monylphenol, 54% water, 1% naphthalene (formalin naphthalene sulfonate) or 1% polycarboxylic acid (polyethylene glycol sulfonic acid ether) have.

Urethane acrylate resin has no heavy metal components such as cadmium (Cd), lead (Pb), mercury (Hg), and hexavalent chromium (Cr6 +) generated in cement concrete, and it irritates the human body such as skin, eyes, and respiratory organs. There are no halogen components such as bromine (Br) and chlorine (Cl), which is highly toxic and corrosive.

The urethane acrylate resin is an organic coating material and corresponds to a flame-retardant resin. The cured urethane acrylate resin can be burned when a high external heat source is continuously applied, but when the heat source disappears, the light goes out within 16 seconds and no longer burns out by itself. Does not.

In addition, the conventional synthetic resin generates an toxic gas when burned in a fire, but the urethane acrylate coating and waterproofing material has an advantage that no toxic gas is generated.

Hereinafter, the repair and reinforcement of sewage culverts using the non-water separable cement mortar composition according to the present invention having the above-described configuration will be described.

1 is a process diagram showing the process of repairing and strengthening the sewage culvert using the water-inseparable cement mortar composition in accordance with the present invention, Figure 2 is a sewage culvert using the water-inseparable cement mortar composition in accordance with the present invention It is a cross-sectional view showing the construction condition of maintenance and reinforcement.

As shown in these drawings, the underwater structure repair and reinforcement method including sewage culvert using the water-inseparable cement mortar composition according to the present invention includes 100 parts by weight of cement; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent consisting of lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; As a method of repairing and reinforcing sewage culverts using a non-water separable cement mortar composition composed of 0.0005 to 0.003 parts by weight of a gas foaming material composed of any one of aluminum powder, nitrogen gas foaming material, and peroxide, deterioration of sewage culvert (C) Chipping the site (S 1); Removing rust of the rebar (S) at the deterioration site (S 2); Washing the rust removing portion of the reinforcing bar (S) with high pressure water (S 3); Zinc oxide (ZnO) 10 wt%, titanium (TiO ₂ ) 10 wt%, aluminum oxide (Al ₂ O ₃ ) 10 wt%, sulfur resin 70 wt% on the surface of the deteriorated part of the high pressure washed sewage culvert (C) Applying the constructed base material 100 (S 4); It consists of a step (S 6) of forming a finishing layer 300 by mixing a non-separable cement mortar composition in water on the base material 100 and applying it in a predetermined thickness and a predetermined shape.

That is, the underwater structure repair reinforcement method using a sewage culvert using the water-inseparable cement mortar composition according to the present invention according to the present invention removes the sewage culvert (C) deterioration site chipping step (S 1), rebar (S) rust Step (S 2); High pressure washing step (S 3), the base material 100 coating step (S 4); The cross-section of the sewage culvert is repaired and reinforced by sequentially applying the finishing layer 300 coating step (S 6).

Here, the sewer culvert (C) chipping step (S 1) chipping the deterioration of the sewer culvert (C).

That is, chipping of the deterioration part of the sewer culvert (C) should minimize the impact on the existing sewer culvert (C) by a pneumatic hammer rather than a hydraulic hammer, and the formation of uniform roughness improves joint strength, constructability, and economy at the same time. In one state, concrete breaking (destruction) and surface grinding of the grinder are mixed with chipping, so that new and old sewage culverts can be joined.

Subsequently, in the step of removing rust of the reinforcing bar (S) (S 2), the rust of the reinforcing bar (S) exposed to the outside of the deterioration part of the sewer culvert (C) is removed, and a rust inhibitor is applied.

Subsequently, in the high-pressure washing step (S 3), the chipping portion and the reinforcing bar rusting portion of the sewer culvert (C) are cleaned with a hot / cold hot water washing machine.

Subsequently, in the step of applying the base material 100 (S 4), 10% by weight of zinc oxide (ZnO), 10% by weight of titanium (TiO ₂ ), aluminum oxide (Al ₂ ) on the deteriorated part of the sewage culvert (C) washed with high pressure O ₃ ) The base material 100 composed of 10% by weight and 70% by weight of sulfur resin is coated with a constant thickness and number of times.

Subsequently, a grid 200 installation step (S 5) is added on the base material 100.

Here, the grid 200 is a glass fiber, carbon fiber, aramid fiber, barzal fiber, fiber-reinforced plastic, PET (Polyethylene Terephthalate), such as fiber tensile strength is large or not stretchable or inclined, the fiber is not corrosive It is a mesh fabric woven in a lattice shape with and weft yarns.

It is revealed that such a grid 200 is installed from the side of reinforcing the bottom of the sewer culvert (C).

Subsequently, the finishing layer forming step (S 6) includes 100 parts by weight of cement on the base material 100; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent consisting of lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; A finishing layer 300 by mixing a water-insoluble non-separable cement mortar composition composed of 0.0005 to 0.003 parts by weight of a gas-foaming material composed of any one of aluminum powder, nitrogen gas foaming material, and peroxidizing material with water or resin to have a constant thickness and width To form.

Underwater non-separable cement mortar composition according to the present invention composed of the composition and construction method as described above and the underwater structure repair and reinforcement method including a sewage culvert using the same are used as a mortar material in repairing and reinforcing the sewage immersion submerged in water. While maintaining the required properties of stiffness, material non-separability, and high fluidity, it improves physical properties such as compressive strength, improves long-term durability, and enhances the strength of adhesion in sewage culverts, so that the maintenance and reinforcement effect can be maintained for a long time. It is excellent in non-separation property of material, so it has excellent material separation resistance and filling property in water, so it has work effects such as workability and eco-friendliness.

The preferred embodiments described in the detailed description of the present invention are exemplary and not limiting, and the scope of the present invention is indicated by the appended claims, and all modifications that fall within the meaning of the claims are provided in the present invention. It is included.

100: base material 200: grid
300: finishing layer C: sewer culvert
S: Rebar

Claims (6)

100 parts by weight of cement;
25 to 100 parts by weight of aggregate consisting of fine aggregate;
25 parts by weight of a concrete strengthening agent comprising lithium silicate and sodium silicate;
0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber;
0.75 to 7.5 parts by weight of a calcium armino ferrite expander;
0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt;
0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent;
Silicone antifoaming agent 0.005 to 0.05 parts by weight;
0.001 to 0.05 parts by weight of a polyether antifoaming agent;
With respect to 100 parts by weight of a mortar composition composed of 0.0005 to 0.003 parts by weight of a gas-foaming material composed of any one of aluminum powder, nitrogen gas foaming material, and peroxide,
10% by weight of zinc oxide (ZnO), 10% by weight of titanium (TiO ₂ ), 10% by weight of aluminum oxide (Al ₂ O ₃ ), 10 parts by weight of base material consisting of 70% by weight of sulfur resin Separable cement mortar composition. delete delete 100 parts by weight of cement; 25 to 100 parts by weight of aggregate consisting of fine aggregate; 25 parts by weight of a concrete strengthening agent comprising lithium silicate and sodium silicate; 0.5 to 10 parts by weight of reinforcing fibers made of glass fiber, carbon fiber, carbon fiber reinforced plastic (CFRP), aramid fiber, barzal fiber, fiber reinforced plastic (FRP), or PET fiber; 0.75 to 7.5 parts by weight of a calcium armino ferrite expander; 0.075 to 0.25 parts by weight of a powdery thickener containing an alkylarylsulfonate and an alkylammonium salt; 0.025 to 0.15 parts by weight of a polycarboxylic acid-based water reducing agent; Silicone antifoaming agent 0.005 to 0.05 parts by weight; 0.001 to 0.05 parts by weight of a polyether antifoaming agent; As a method for repairing and reinforcing sewage culverts using a non-water separable cement mortar composition composed of 0.0005 to 0.003 parts by weight of a gas foaming material composed of any one of aluminum powder, nitrogen gas foaming material, and peroxide material,
Chipping the deterioration of the sewer culvert (S 1);
Removing the rust of the rebar at the deterioration site (S 2);
Washing the rust removal portion of the rebar with high pressure water at high pressure (S 3);
Base material consisting of 10% by weight of zinc oxide (ZnO), 10% by weight of titanium (TiO ₂ ), 10% by weight of aluminum oxide (Al ₂ O ₃ ), and 70% by weight of sulfur resin on the surface of the deteriorated part of the high-pressure washed sewage culvert Step of applying (S 4);
Sewage using a non-water-removable cement mortar composition characterized in that it consists of a step (S 6) of forming a finishing layer by mixing in water with a predetermined thickness and a predetermined shape by mixing the water-inseparable cement mortar composition on the base material. Underwater structure repair and reinforcement method including culvert. According to claim 4,
Repairing and strengthening a submerged structure including a sewage culvert using a non-water separable cement mortar composition, characterized by adding a step (S 5) of installing a grid on the base material. The method of claim 5,
The grid is an underwater structure comprising a sewage culvert using a non-water-removable cement mortar composition, characterized in that it is composed of any one of glass fiber, carbon fiber, aramid fiber, bazal fiber, fiber reinforced plastic, and PET (Polyethylene Terephthalate) fiber. Conservative reinforcement method.

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