Single-face repairing mortar composition for vehicle collecting pipeline and concrete single-face repairing and reinforcing process by using single-face repairing mortar composition

Abstract

The invention provides a single-face repairing mortar composition for a vehicle collecting pipeline and a concrete single-face repairing and reinforcing process using the same. 24-45 parts by weight of calcium hydroxide binder obtained by mixing 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, and 10-20 parts by weight of blast furnace slag, 30-45 parts by weight of silica sand, 0.1-2 parts by weight of mica, 0.05-0.1 part by weight of water reducing agent, 0.1-8.0 parts by weight of silicon carbide (SiC) fiber, 0.1-8.0 parts by weight of silicic acid resin, 1.0 part by weight of KOH, and 5-10 parts by weight of sodium silicate (KOH-0. 1) by filling with parts by weight of silica gel and parts by weight of calcium hydroxide binder obtained by mixing 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, and 10-20 parts by weight of blast furnace slag The cross section repairing mortar composition for the differential collecting pipeline can repair the cross section of a deteriorated part formed by differential collecting pipeline concrete, and can prevent the penetration of harmful components (such as hydrogen sulfide, sulfurous acid gas and corrosive gas), carbon dioxide, water and the like, which are capable of reducing the durability of the differential collecting pipeline concrete. The compression, distortion and adhesion strength of the differential collection pipeline concrete can be improved, and the impact resistance of the differential collection pipeline concrete can also be improved.

Description

Technical Field

[0001] This invention relates to inorganic polymer mortar compositions and methods for repairing and reinforcing concrete sections using the same. It further describes in detail a method for repairing and reinforcing concrete sections of distribution pipelines by filling them with a section-repairing mortar composition, thereby preventing the penetration of harmful components (such as hydrogen sulfide, sulfurous acid gas, and corrosive gases), carbon dioxide, and moisture, which contribute to the degradation of the concrete's durability and corrosion. Background Technology

[0002] Generally, to treat wastewater discharged from households or businesses, sewage pipes or rainwater pipes that discharge rainwater into rivers are buried underground. Sewage pipes and rainwater pipes are collectively referred to as sewer pipes. These sewage pipes are connected to multiple sewage pipes for use to divert sewage or rainwater to sewage treatment plants or rivers.

[0003] These sewage pipelines are equipped with sewage treatment plants that can purify incoming sewage or pollutants contained in the sewage, or secondary manifolds that guide the sewage to the final sewage treatment plant.

[0004] The aforementioned collection pipelines are primarily made of concrete, with cross-sections mostly circular, rectangular, or elliptical. If leaks occur in underground collection pipelines due to deterioration over time, impact-induced cracks, or tensile stress at connections, the leaking sections will be excavated and either newly constructed or directly repaired in the area where the collection pipelines are buried.

[0005] On the other hand, according to the American Concrete Institute, concrete durability is defined as the ability of concrete to resist weathering, chemical erosion, abrasion, and other deteriorating processes, which means that the deterioration of concrete structures is caused by a variety of factors.

[0006] The causes of degradation can be divided into chemical degradation and physical degradation. More specifically, 1) chemical degradation causes include alkali-aggregate reaction degradation, sulfate and acid degradation, and steel corrosion degradation, etc.; 2) physical degradation causes include freeze-thaw degradation, shrinkage and load degradation, and degradation under special circumstances such as fire. The aforementioned causes of degradation have multiple degradation factors, either common or independent.

[0007] Among the deterioration of distribution pipelines, sulfate and acid-induced degradation are the most problematic chemical substances directly affected by cement hydration. Sulfates are the most frequently exposed to sulfates, unlike other chemicals, and exhibit a unique degradation mechanism. Sulfates are present in seawater and are also generated by hydrogen sulfide and sulfuric acid produced in environments rich in organic matter, such as sewers or settling tanks. Furthermore, they are widely generated by industrial waste, soil, and groundwater.

[0008] Here, the secondary manifold concrete refers to the concrete in which cement hydrates (aluminates) react with chemical substances (corrosive substances) such as hydrogen sulfide and sulfates produced by sulfuric acid in environments rich in organic matter, such as sewers or sedimentation tanks, to form new compounds such as gypsum, which then expand into the concrete. Gypsum softens the cementitious structure and reduces its strength; the resulting expansion pressure deteriorates the concrete.

[0009] In other words, due to the chemical and thermal effects of this differential pipeline concrete, the cement hydrates (aluminates) in the concrete react with chemical substances (corrosive substances) such as hydrogen sulfide and sulfates produced by sulfuric acid in environments rich in organic matter, such as sewers or sedimentation tanks. This reaction leads to porous internal structures of the hardened cement and the expansion pressure generated by new compounds such as gypsum, resulting in concrete deterioration.

[0010] Furthermore, in the chemical heat source—the corrosion and deterioration of heavy steel reinforcement, the concrete of the secondary manifold is in a strongly alkaline environment with a pH of 12-13 generated by calcium hydroxide (Ca(OH)2) produced by the cement hydration reaction, forming a floating dynamic film of FeO(OH), Fe2O3, Fe3O4, etc., about 2 nanometers in size. Therefore, the steel reinforcement buried in the concrete of the secondary manifold is stable against corrosion.

[0011] However, if exposed to carbon dioxide in the air for a long period, the calcium hydroxide in concrete will slowly turn into calcium carbonate, causing the concrete to gradually lose its alkaline properties and become neutralized. This neutralization, caused by carbonation and a decrease in pH value, proceeds gradually from the surface of the concrete inwards.

[0012] If carbonation lowers the pH value, these suspended films will be destroyed. If water and air permeate, the absorbed water and air will corrode the steel reinforcement inside the concrete. At this point, if substances such as chloride or sulfate ions penetrate, corrosion will proceed at a faster rate, causing volume expansion, leading to cracks in the concrete, and resulting in a loss of structural strength and durability.

[0013] To prevent this phenomenon, substances mainly composed of polyols and isocyanates were previously used to penetrate and harden the concrete surface, and epoxy resin, including ordinary pigments, was applied to the concrete surface to prevent neutralization and salt damage.

[0014] This coating process relies on the physical strength and chemical stability of the cured epoxy resin to achieve its purpose. However, it is easily damaged by sand or dust blown by the wind, which can cause moisture to penetrate the concrete surface, leading to coating peeling. It cannot be permanently neutralized or prevent salt damage, resulting in repeated repairs and construction in a short period of time, which can lead to economic losses.

[0015] The prior art related to this invention is Korean Patent Registration No. 10-1205546 (publication date: November 30, 2012), which begins the technology of "high-strength inorganic polymer release composition and method for repairing, reinforcing and insulating concrete using the same". Summary of the Invention

[0016] The problem that the invention aims to solve

[0017] To address the aforementioned problems, the present invention aims to repair deteriorated sections of manifold concrete by filling a single-sided repair mortar composition for manifolds. This prevents the penetration of harmful components (such as hydrogen sulfide, sulfite gas, and corrosive gases), carbon dioxide, and moisture that cause durability degradation and corrosion due to the deterioration of the manifold concrete. The resulting single-sided repair mortar for manifolds provides a material with excellent durability, acid resistance, and durability. It prevents concrete deterioration caused by chemical erosion in the environment, thus avoiding repeated repair work. To save on maintenance costs, a single-sided repair mortar composition for manifolds is being provided.

[0018] Another objective of this invention is to eliminate deteriorated sections of the concrete in the distribution pipe system, eliminate corrosion of the reinforcing steel bars arranged inside the concrete, treat the reinforcing steel bars with an anti-corrosion material after high-pressure water cleaning, spray new and old adhesives onto the deteriorated sections of the concrete in the distribution pipe system, repair the deteriorated sections of the concrete in the distribution pipe system using the manufactured mortar composition for repairing the sections, and seal the sections with a protective material, thereby giving the concrete sections of the distribution pipe system good salt resistance, thus achieving the purpose of repairing the concrete sections. This invention aims to provide legal support.

[0019] means for solving problems

[0020] The cross-section of the concrete repaired by the differential pipeline has good strength, durability, resistance to neutralization, chemical resistance and acid resistance. In harsh environments where various pollutants flow in, in order to provide a cross-section repair mortar composition for differential pipelines, it can prevent concrete deterioration caused by chemical erosion. The cross-section repair mortar composition for differential pipelines of the present invention is as follows.

[0021] 1) A mortar composition for repairing the thermal cross-section of concrete in differential pipelines used to guide sewage or wastewater to sewage treatment plants, comprising: 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, 10-20 parts by weight of blast furnace slag, 24-45 parts by weight of calcium hydroxide binder, 30-45 parts by weight of silica sand, 30-45 parts by weight of silica sand (silica), 2-3 parts by weight of mica, 4-33 parts by weight of silane (silica fume) (KOH), 0.1-3 parts by weight of silica gel, 0.1-3 parts by weight of encapsulating agent, and 5-10 parts by weight of silica gel. It is characterized by being mixed with water for use.

[0022] 2) The mortar composition of the present invention also has the following characteristics: the polymer resin is a water-soluble resin or a water-dispersible resin, wherein the water-soluble resin is selected from one or more of polyethylene glycol (PVA), polyacrylate, polyacrylamide, polyacrylic acid, and polyethylene glycol, and the water-dispersible resin is selected from one or more of vinyl acrylate (EVA) and SBR (Styrene Butadiene Rubber).

[0023] 3) In other aspects of the present invention, in order to provide a single-sided repair and reinforcement process for secondary manifolds that offers excellent durability against neutralization and salt damage, the process includes the following steps in the concrete section repair and reinforcement process for secondary manifolds that guide sewage or wastewater to a sewage treatment plant: removing the deteriorated portion of the secondary manifold concrete; eliminating corrosion of the internal reinforcing steel in the secondary manifold concrete; cleaning the deteriorated section and the surface of the reinforcing steel with high-pressure water; performing a tackling process on the reinforcing steel using a tackling material; and spraying new and old adhesives onto the heat-affected section of the secondary manifold concrete. The process of using a mortar composition for repairing the cross-section of a sub-manifold to repair deteriorated sections of concrete in a sub-manifold, comprising 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, 10-20 parts by weight of blast furnace slag, 24-45 parts by weight of calcium hydroxide binder, 30-45 parts by weight of silica sand, 0.1-2 parts by weight of mica, 0.05-0.5 parts by weight of water-reducing agent, 0.1-8.0 parts by weight of silicon carbide (SiC) fiber, 0.5-1.0 parts by weight of polymer resin, 0.00-1.0 parts by weight of potassium hydroxide (KOH), 0.00-1.0 parts by weight of calcium silicate, and 0.00-1.0 parts by weight of silica gel, is as follows: The process of using a mortar composition for repairing the cross-section of a sub-manifold to repair deteriorated sections of concrete in a sub-manifold; and the process of applying a protective coating material to the concrete surface of the sub-manifold.

[0024] 4) The concrete section repair and reinforcement process of the present invention also has the following characteristics: the polymer resin is a water-soluble resin or a water-dispersible resin, wherein the water-soluble resin is selected from one or more of polyvinyl alcohol (PVA), polyacrylate, polyacrylamide, polyacrylic acid, and polyethylene glycol, and the water-dispersible resin is selected from one or more of vinyl acrylate (EVA) and SBR (Sbuteneadiene Rubber).

[0025] 5) The feature of the concrete section repair and reinforcement process of the present invention is that, in the process of removing the deteriorated part of the concrete in the collection pipeline, the deteriorated part can be removed using a rock drill, a mill and a crusher.

[0026] 6) The concrete section repair and reinforcement process of the present invention also has the following characteristics: in the process of removing the corrosion of the steel bars arranged inside the concrete of the secondary manifold, the steel bars are cleaned with a brush and a grinding wheel to remove the corrosion of the steel bars; in the process of cleaning the heat-induced section of the concrete of the secondary manifold and the surface of the steel bars with high-pressure water, the heat-induced section of the concrete of the secondary manifold and the surface of the steel bars can be cleaned by high-pressure water sprayed from the high-pressure water, thereby removing these substances.

[0027] 7) The concrete section repair and reinforcement process of the present invention is characterized in that, during the process of using anti-theft materials to treat the steel bars, the anti-theft materials include 20-40% by weight of ceramic powder, 25-40% by weight of acrylic emulsion, 10-30% by weight of epoxy and 15-25% by weight of silicone.

[0028] 8) The characteristic of the concrete section repair and reinforcement process of the present invention is that, during the process of spraying new and old adhesives onto the deteriorated section of the secondary manifold concrete, the new and old adhesives are uniformly sprayed onto the deteriorated section of the secondary manifold concrete using a brush, sprayer, and echo sprayer, and the spraying amount of the new and old adhesives is 0.36 kg / m. 2 .

[0029] 9) The feature of the concrete section repair and reinforcement process of the present invention is that, during the process of repairing the deteriorated section with the secondary manifold section repair mortar composition, the filling thickness of the secondary manifold section repair mortar composition is 10 mm or more.

[0030] 10) The characteristic of the concrete section repair and reinforcement process of the present invention is that the protective coating material includes 25-30% by weight of silicate, 40-60% by weight of mineral powder that radiates far-infrared rays, 10-20% by weight of epoxy adhesive, and 2-5% by weight of curing agent.

[0031] Accordingly, this invention proposes a secondary manifold cross-section repair mortar composition that can prevent concrete deterioration due to chemical erosion in harsh environments with various pollutants, and provides excellent durability against neutralization and salt damage to the secondary manifold concrete, as well as a process for repairing and reinforcing concrete cross-sections using the mortar composition.

[0032] Invention Effects

[0033] According to various embodiments of the present invention, by filling the cross-section repair mortar composition for the differential pipeline of the present invention, the deteriorated cross-section of the concrete of the differential pipeline is repaired, which has the effect of preventing the penetration of harmful components (such as hydrogen sulfide, sulfite gas and corrosive gas), carbon dioxide and moisture, which cause the degradation of the concrete of the differential pipeline to lead to a decrease in durability and corrosion.

[0034] Furthermore, by filling the single-sided repair mortar composition for vehicle manifolds with such a manufactured material, the single-sided concrete repair of the vehicle manifold has good strength, durability, resistance to neutralization, chemical resistance, and acid resistance. In harsh environments where various pollutants flow in, it can prevent the concrete from deteriorating due to chemical erosion by the vehicle manifold, thus eliminating the need for repeated repair work and reducing repair costs.

[0035] Furthermore, the single-sided repair and reinforcement process for concrete using a single-sided repair mortar composition for distribution pipelines, as described in this invention, can prevent the penetration of harmful components (such as hydrogen sulfide, sulfurous acid gas, and corrosive gases), carbon dioxide, and moisture that cause degradation of distribution pipeline concrete, leading to decreased durability. It can not only improve the compressive strength, torsional strength, and adhesion strength of distribution pipeline concrete, but also enhance its impact resistance, neutralization properties, acid resistance, and acid tolerance.

[0036] In addition, by improving the adhesion of the concrete to the secondary manifold, damage such as cracks and peeling can be prevented after the repair and reinforcement of the deteriorated section of the secondary manifold concrete, thereby ensuring the durability of the secondary manifold concrete and extending its service life. Attached Figure Description

[0037] Figure 1 According to various embodiments of the present invention, cross-sectional views showing the repair status of concrete sections are generated using a cross-sectional repair mortar composition for differential piping.

[0038] Figure 2 This is a process flow diagram of a single-sided repair and reinforcement process for concrete using a single-sided repair mortar composition for distribution pipelines, according to various embodiments of the present invention.

[0039] Explanation of reference numerals in the attached figures

[0040] 10: Concrete on Tea House Road;

[0041] 11: Reinforcing steel bars;

[0042] 12: Rebar corrosion inhibitor;

[0043] 13: Single-sided repair mortar composition for tea collection pipelines;

[0044] 14: New and old adhesives;

[0045] 15: Protective coating material;

[0046] 16: Cross-section of the heat-treated section;

[0047] 17: The surface of the concrete in the manifold. Detailed Implementation

[0048] This invention can be modified in many ways and has many embodiments, some of which are described in detail with reference to the drawings. However, this is not intended to limit the invention to a specific implementation, but should be understood to include all modifications, equivalents, or substitutions within the scope of the inventive concept and technology.

[0049] Ordinal terms, such as "first," "second," etc., may be used to describe various components, but the components are not limited by the terms. The terms are used only to distinguish one component from another. For example, without departing from the scope of this invention, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and / or" includes a combination of or any one of a plurality of related descriptions.

[0050] Furthermore, relative terms describing information based on what is shown in the graphics, such as "before," "after," "up," and "down," can be replaced by ordinal numbers such as "first" and "second." The order of ordinal numbers such as "first" and "second" can be either the order mentioned or arbitrarily determined and can be changed as needed.

[0051] The terminology used in this invention is for illustrative purposes only and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly distinguishes them. In this invention, terms such as “comprising” or “owning” should be understood to specify the presence of the features, numbers, steps, actions, components, parts, or combinations thereof listed in the list, without excluding the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

[0052] Unless otherwise defined, all terms used herein, including technical or scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms as defined in commonly used dictionaries shall be interpreted as having the same meaning in the context of the relevant art and shall not be construed as having an ideal or overly formal meaning unless explicitly defined herein.

[0053] "Sewage" refers to wastewater that is contaminated by liquid or solid pollutants due to human life or economic activities, as well as rainwater and groundwater that flow into sewers from facilities other than buildings and roads.

[0054] "Sewerage" refers to the pipes and ancillary facilities installed or managed by local self-governing bodies for the purpose of transporting sewage to public sewage treatment facilities, simple public sewage treatment facilities, sewage interception facilities, or to shared water surfaces other than rivers or the sea.

[0055] Water solubility and water dispersibility refer to whether something dissolves or disperses well in water, but they are essentially the same in terms of their ability to mix well with water.

[0056] <Single-sided Repair Mortar Composition for Teahouse Road>

[0057] The deterioration of cement concrete is mainly caused by water or deteriorating agents penetrating into the concrete through capillary pores in the concrete via permeation or diffusion. Therefore, reducing the number of capillary pores and cutting off the capillaries that are formed can prevent water or gas from penetrating into the interior, thereby preventing the chemical and physical deterioration of cement concrete.

[0058] The present invention relates to a single-sided repair mortar composition for vehicle manifolds, used to repair deteriorated sections of concrete in vehicle manifolds of wastewater treatment plants that induce sewage or pollutants contained in sewage into treatable wastewater, and is used in combination with water.

[0059] The single-sided water-retaining mortar composition for manifolds of the present invention is composed of a mixture of Portland cement (30-50 parts by weight), alumina cement (10-20 parts by weight), blast furnace slag (10-20 parts by weight), calcium hydroxide binder (24-45 parts by weight), silica sand (30-45 parts by weight), mica (0.1-2 parts by weight), water-reducing agent (0.05-0.5 parts by weight), silicon carbide (SiC) fiber (0.1-8.0 parts by weight), silica fume (0.05 parts by weight), KOH (0.5 parts by weight), KOH (0.30 parts by weight), and silica gel (5-10 parts by weight), and is used in a reactor for mixing with water.

[0060] The calcium hydroxide binder applicable to this invention is first mixed by a weight ratio of 30-50 parts Portland cement, 10-20 parts alumina cement, and 10-20 parts blast furnace slag.

[0061] Portland cement, as the main binder for mortar strength, constitutes the basic specifications of the product. Especially in applications requiring acid resistance, alumina cement is used to accelerate hardening and shorten curing time. Blast furnace slag is used for product stability and long-term strength. Blast furnace slag can be used in powder form.

[0062] The calcium hydroxide binder prepared in this way combines the materials of the single-sided repair mortar composition for vehicle manifolds with each other and is used for bonding with concrete.

[0063] If the amount of calcium hydroxide binder is lower than the lower limit of 24 parts by weight, the bonding force between materials and the bonding force to concrete will be weak. If the amount is greater than the upper limit of 45 parts by weight, the bonding force will not change much.

[0064] The silica sand applicable to this invention is a type of quartz sand rich in silica (SiO2), used as a building material in concrete, mortar, and other applications. Silicate (SiO2), contained in silica sand, is one of the most abundant elements on Earth, found in various places including sand. The quality of silica sand is evaluated based on its silica content, particle size, and impurity content; higher silica content and smaller particle size indicate better quality. Types include mountain silica sand collected from mountains, natural silica sand collected from rivers or the sea, and coastal silica sand collected from the coast.

[0065] If the silica sand used to enhance the durability of the secondary manifold concrete 10 is added in amounts less than the lower limit of 30 by weight, the durability enhancement effect is weak; if more silica sand is added than the upper limit of 45 by weight, the durability enhancement does not change much.

[0066] The mica used in this invention is a silicate mineral produced in an extremely thin, plate-like form. Its plate-like structure can block capillaries and prevent water penetration, and its silicate composition has excellent durability properties.

[0067] Mica is used in the paint industry as a material to demonstrate water-resistant, weather-resistant, and shrinkage-resistant properties, which are also exhibited in cement mortar.

[0068] If mica is mixed in at a weight ratio below the lower limit of 0.1 parts by weight, the water impermeability is weak, and the specific gravity of mica is low. If the mixing amount is greater than the upper limit of 2 parts by weight, the cement-water ratio will increase, leading to a decrease in properties such as strength. Therefore, it is suitable to use within the weight range.

[0069] The water-reducing agent applicable to this invention, also known as a dispersant, flow agent, etc., uses polycarbonate-based, melamine-based, naphthalene-based, etc., and under the same working conditions, reduces the number of capillaries by forming a dense structure through a reduced cement-water ratio. In other words, the water-reducing agent is coated on the surface of the raw material, imparting an electrochemical reaction force, thus uniformly dispersing the particles, activating the water trapped inside the aggregated particles, contributing to flowability, and thereby achieving the effect of water reduction or enhanced flowability.

[0070] If the water-reducing agent is mixed in less than 0.05 parts by weight of the lower limit of the stated weight ratio, the water-reducing or flowability-enhancing effect is weaker; if it is mixed in more than 0.5 parts by weight of the upper limit, the water-reducing or flowability-enhancing effect does not change much.

[0071] The silicon carbide (SiC) fibers applicable to this invention can be either coarse fibers manufactured by chemical vapor deposition or fine, soft fibers manufactured by precursor methods. Depending on the state of the cross-section repair, they can be cut to appropriate lengths for use. They have good heat resistance, chemical resistance, and acid resistance. As a secondary manifold, they can form the cross-section repair mortar composition with properties particularly needed for corrosion resistance, acid resistance, and acid resistance to sewage or sulfates in sewage.

[0072] If silicon carbide (SiC) fibers are mixed at a weight ratio below the lower limit of 0.1 parts by weight, the effect on resistance to corrosive pollutants such as sulfates in sewage is weak. If the mixture exceeds the upper limit of 8 parts by weight, the improvement in resistance to chemicals and acids will not be significant, and maintenance costs will increase.

[0073] The polymer resin suitable for use in this invention, used to enhance adhesion strength and torsional strength, can be a water-soluble resin or a water-dispersible resin. It is worth noting that the water-soluble resin can be one or more selected from polyethylene glycol (PVA), polyacrylonitrile, polyacrylamide, polyacrylic acid, and polyethylene glycol; the water-dispersible resin can be one or more selected from vinyl vinyl acetate and styrene butadiene rubber (SBR); and both the water-soluble and water-dispersible resins can be in powder form.

[0074] If the polymer resin is mixed at a weight ratio lower than the lower limit of 0.5 parts by weight, the enhancement of adhesion strength and torsional strength is weak. If the mixing ratio is at the upper limit of 1.0 parts by weight, the enhancement of adhesion strength and torsional strength does not change much. The coating cement particles hinder hydration and exhibit excessive compressive strength. Therefore, it is suitable for use within the appropriate range.

[0075] The potassium hydroxide (KOH) used in this invention, also known as caustic potassium, was long ago produced in large quantities using a causticization method involving the reaction of caustic potassium with lime oil, but is now obtained by electrolyzing an aqueous solution of potassium chloride. It has a melting point of 360.4°C, a boiling point of 1320°C, and a specific gravity of 2.055.

[0076] It is a typical strong alkali; its salts are so alkaline that they can burn the skin, so caution should be exercised when using it. It reacts with acids to produce salt and water. Because it is hygroscopic and strongly alkaline, it can prevent concrete from gradually losing its alkaline properties and becoming neutral, and it mixes with cement to maintain its solidified state.

[0077] If potassium hydroxide (KOH) is mixed at a weight ratio below the lower limit of 4 parts by weight, its anti-neutralization properties are minimal. If it is mixed at a weight ratio exceeding the upper limit of 33 parts by weight, it can react with corrosive substances such as sulfates, generating heat and steam, which weakens the durability of concrete. It can also absorb water and carbon dioxide from the air to form potassium carbonate, which deteriorates the concrete. Therefore, it is suitable for use within appropriate limits.

[0078] The silica fume cement used in this invention is an important material for addressing the cause of concrete thermalization in the cross-section repair mortar composition of this invention. It is micro-silica fume particles obtained by collecting silica contained in the waste gas generated during the manufacture of silicon (Si), ferrosilicon (FeSi), silicon alloys, etc., in a dust collector. It is considered an essential material for manufacturing high-strength concrete. The cement mixture improves the hydration effect of the cement by continuously filling the voids between calcium hydroxide particles. This is well known.

[0079] It reduces the rate of carbonation, reduces the permeability of chlorides, does not react with most acids and alkalis, has strong corrosion resistance, and can improve the tensile and compressive strength of mortar hardening materials.

[0080] If the amount of silica fume is less than the lower limit of 0.1 parts by weight, the various properties of silica fume in the composition will be minimal in order to prevent concrete deterioration. If the amount exceeds the upper limit of 3 parts by weight, there will be little change in the improvement of concrete strength.

[0081] The silica aerogel applicable to this invention is a very lightweight, highly insulating solid particle (nanoparticle) made of silica (SiO2) gel. It is a flame-retardant and stable inorganic material with a melting point of approximately 1200°C and a specific gravity approximately 1.6 times that of air or 0.002 times that of water (0.002 g / cm³). 3 The thermal conductivity is 0.004~0.03W / m. 2 K has a thermal insulation performance that is about 2 to 3 times better than that of foam.

[0082] Silica aerogel has better thermal insulation properties than air, exhibiting excellent thermal insulation and lightweight properties. Silica aerogel also has hydrophobic properties, making it more resistant to water than ordinary cement.

[0083] Unlike ordinary silicone, which has a hydrophilic surface due to the presence of hydrogen hydride, the surface of the silicone aerogel is coated with a non-polar hydrogenating agent during the product manufacturing process, thus exhibiting hydrophobicity.

[0084] The results showed that if water-based cement release agent comes into direct contact with hydrophobic silica gel, a chemical reaction does not occur immediately. However, because the cement release agent exhibits a strong alkalinity of 10-12, it will corrode the fire extinguishing agent of the silica aerogel coating over a long period, causing it to combine with the internal silica components.

[0085] If silicone is mixed with less than 5 parts by weight of the aforementioned weight ratio, it will not achieve the effects of heat insulation, crack prevention, and anti-condensation. If more than 10 parts by weight of the mixture is mixed, the heat insulation and crack prevention effects will increase, but the adhesion and durability will be insufficient.

[0086] Silicon aerogels are available on the market for direct use without any further processing.

[0087] In this invention, the components contained in the single-sided repair mortar composition for cross-connecting pipes and the composition of each component mixed in the optimal weight ratio all work together to exert an enhancing effect, preventing the decrease in durability of cross-connecting pipe concrete and the occurrence of neutralization and salt damage, which are the causes of corrosion. It can prevent the penetration of harmful components (such as hydrogen sulfide, sulfurous acid gas and corrosive gases), carbon dioxide and moisture, and prevent corrosion, thereby improving the torsional resistance, compressive strength, acid resistance, durability, and stain resistance of cross-connecting pipe concrete.

[0088] An example of the manufacture of the mortar composition of the present invention is as follows:

[0089] First, Portland cement, alumina cement, and blast furnace slag powder are mixed in appropriate weight ratios to prepare calcium hydroxide binder powder.

[0090] After mixing the mica, water-reducing agent, defoamer, silicon carbide (SiC) fiber and polymer resin, calcium hydroxide binder powder and silica fume cement powder are mixed into the mixture, and then potassium hydroxide (KOH) powder, silica sand and silica fume aerogel are mixed in.

[0091] This type of mortar composition is used when mixed with water.

[0092] Ideally, water should be mixed in a ratio of 15 to 20 parts by weight for every 100 parts by weight of the mortar composition. If the water ratio exceeds 15 to 20 parts by weight for every 100 parts by weight of the mortar composition, it may become too thin, resulting in poor workability and difficulty in achieving the desired mortar properties.

[0093] On the other hand, if hydrophobic silica gel comes into direct contact with water-based cement mortar, a chemical reaction will not occur immediately. However, the pH value of cement mortar exhibits strong alkalinity (10-12), which will corrode the fire extinguishing agent of the silica gel coating over a long period of time and combine with the internal silica gel components.

[0094] Ultimately, cement mortar and silicone are not easily mixed physically in a short time, but rather require a longer mixing period of about 20-40 minutes to achieve uniform mixing through rainfall. Chemically, cement and silicone do not react in a short time, but a chemical reaction will occur if the mixture is kept in contact with the soil for a considerable period of time.

[0095] Currently, silicone can be prepared in three forms worldwide: powder, granules, and fibrous sheet impregnation. This invention involves mixing these three forms of silicone with cement mortar to prepare a single-sided repair mortar composition for manifolds that maximizes the inherent properties of silicone.

[0096] <Concrete Single-Sided Repair and Reinforcement Process Using Single-Sided Repair Mortar Composition for Differential Piping>

[0097] Figure 1 This is a cross-sectional view of a single-sided repair mortar composition 13 for a differential pipe, representing a single-sided repair of a concrete 10 in a differential pipe according to different embodiments of the present invention. Figure 2 This is an engineering flow diagram of the process of single-sided repair and reinforcement of concrete 10 in a differential pipeline using a single-sided repair mortar composition 13 for differential pipelines, according to different embodiments of the present invention.

[0098] A vehicle-collecting pipeline is a system where multiple sewer lines converge to transport water to a wastewater treatment plant. These sewers are frequently full, with high flow rates and velocities. To accommodate the concrete 10-section section repair and reinforcement process for vehicle-collecting pipelines specified in this invention, the water in the pipeline will first be emptied and returned to its original state.

[0099] like Figure 1As shown, to facilitate maintenance work on the vehicle collection pipeline in one embodiment of the present invention, a differential pressure device is installed on a portion of the vehicle collection pipeline using the water diversion facilities of the aforementioned terrain to block the flow of sewers. Other differential pressure devices are also installed in the vehicle collection pipeline to maintain a distance from the aforementioned differential pressure devices, providing a non-flowing section within the vehicle collection pipeline. A detour pipe is inserted into a manhole upstream of the vehicle collection pipeline, and a detour device is installed on the above-ground detour-driven sewer, allowing the bypassed sewer pipeline to bypass the differential pressure device and supply sewage to the passing differential pressure pipeline from the maintenance work area where the differential pressure device is installed.

[0100] In the differential pipeline, sewage and foreign objects can be removed from the area where the differential pipeline is installed, and the cross-sectional repair work of the concrete 10 of the differential pipeline in the area can be carried out under this condition.

[0101] First, the deteriorated concrete portions generated by the concrete in the manifold 10 can be removed. For example, these deteriorated portions can be removed using rock drills, grinding wheels, and crushers. In other words, the heat-damaged portions can be removed by using rock drills, grinding machines, and crushers during concrete pouring operations.

[0102] At this point, if the deteriorated part of the concrete is removed, the deteriorated section 16 will appear. Figure 1 For the purpose of understanding the cross-section of the concave connection, four locations are marked as deteriorated sections 16. However, the shape or form of the deteriorated section 16 may vary depending on the concrete deterioration caused by the secondary manifold concrete 10.

[0103] Secondly, this can eliminate corrosion of the reinforcing bars 11 arranged inside the secondary manifold concrete 10 where the heat-induced parts are removed. For example, the corrosion of the reinforcing bars 11 can be removed using a brush and a grinding wheel.

[0104] Moreover, this allows for the removal of corroded steel bars 11 using high-pressure water cleaning.

[0105] For example, foreign matter can be removed from the heat-affected section 16 and the surface of the reinforcing steel 11 formed on the concrete 10 of the differential pipeline using high-pressure water jets (not shown).

[0106] In this state, listening materials 12 can be used on the steel bar 11 for listening in.

[0107] For example, the dustproof material 12 can be a surface dustproof material comprising 20-40% by weight of ceramic powder, 25-40% by weight of acrylic emulsion, 10-30% by weight of epoxy, and 15-25% by weight of silicone. The anti-theft material 12 manufactured in this way can be evenly applied to the reinforcing bar 11 using a brush (not shown).

[0108] The ceramic exhibits excellent corrosion resistance and is used to enhance the anti-corrosion effect on reinforcing bars through a surface coating of the anti-corrosion material. If less than 20% by weight is mixed in, the anti-corrosion effect is weak; if more than 40% by weight is mixed in, the amount of other materials will decrease, and the bonding strength will decline. The ceramic is made of powder, and considering factors such as the mixing ratio with the materials and workability, a particle size of 50–300 mesh can be used.

[0109] The epoxy resin has good adhesion and thick film forming properties, and can be used as a coating for steel. When the epoxy resin content is less than 10%, the coating and soundproofing function decrease. When the content exceeds 30%, the adhesion between the soundproofing material and the surface of the steel reinforcement decreases.

[0110] In addition, when the acrylic emulsion content is less than 25% by weight and the silicone content is less than 15% by weight, the adhesion to the steel reinforcement surface decreases and the alkaline recovery treatment function decreases. When the acrylic emulsion content exceeds 40% by weight and the silicone content exceeds 25% by weight, it will lead to a decrease in the listening function and an increase in maintenance costs.

[0111] Alternatively, 5 to 15 parts by weight of water can be mixed into 100 parts by weight of the listening material.

[0112] Secondly, after the steel reinforcement 11 has finished listening, new and old adhesives 14 can be sprayed onto the heat-melting section 16 formed by the concrete 10 of the secondary manifold.

[0113] The new and old adhesive 14 is sprayed for bonding existing and new concrete. It should be selected and used for concrete structures with strong adhesion, such as for repairing / reinforcing concrete structures and for mortar bonding enhancers, but not limited to those with specific adhesion.

[0114] The new and old adhesive 14 can be evenly sprayed twice along the heat-induced section 16 formed by the concrete 10 of the secondary manifold, using a brush, sprayer and echo gun.

[0115] The coating amount of the new and old adhesives 14 is 0.36 kg / m². 2 In other words, the average coating weight of the new and old adhesives 14 in a single application can reach 0.18 kg / m³. 2 .

[0116] Then, in order to repair the heat-affected section 16 of the sprayed new and old adhesives 14, a single-sided repair mortar composition 13 for vehicle manifolds, consisting of a mixture of 24-45 parts by weight of calcium hydroxide binder (mixed in the weight ratio of 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, and 10-20 parts by weight of blast furnace slag), 30-20 parts by weight of silica sand, 30-0.1 parts by weight of silica sand, mica, silicified parts ...

[0117] This single-sided repair mortar composition 13 for secondary manifolds can be mixed with water for use.

[0118] In other words, the mortar composition 13 for repairing the secondary manifold section can be filled into the heat-affected section 16 formed by the secondary manifold concrete 10. At this time, the heat-affected section 16 formed by the secondary manifold concrete 10 can be repaired by the composition 13.

[0119] The composition 13 can achieve a thickness of more than 10 mm during a single charge.

[0120] Secondly, the protective coating material 15 applicable to the surface of the secondary manifold concrete 10 may include a tower sleeve. For example, the protective coating material 15 may be uniformly sprayed twice onto the surface of the secondary manifold concrete 10 using a brush, sprayer, and echo gun.

[0121] After the protective coating material 15 is sprayed once, it can be sprayed twice after the staff touches it to confirm that the fingertips are dry.

[0122] The protective coating material 15 may be composed of 25-35% by weight of silicate, 40-60% by weight of mineral powder that radiates far-infrared rays, 10-20% by weight of epoxy binder, and 2-5% by weight of curing agent.

[0123] When silicates are used as moisture-proofing agents, the moisture-proofing effect is weak when mixed with less than 25% by weight, and the moisture-proofing effect is not much different when mixed with more than 35% by weight. When the amount of other materials is reduced, the far-infrared radiation is small and the bonding strength is weakened.

[0124] In mineral powders, germanium, maifanite, jade, loess, etc., can be used alone or in mixtures of two or more. Different particle sizes from 50 to 250 mesh can be used. When the mixture is less than 40% by weight, the far-infrared emissivity is low. When the mixture exceeds 60% by weight, the bonding strength will be weakened.

[0125] Cyclohexane is a liquid adhesive used to bond materials. If the mixing amount is less than 10%, the bond strength will be weak, and if the mixing amount is more than 20%, the workability will decrease.

[0126] Hardeners are used to shorten the coating time of materials. If commercially available products are used, the curing time cannot be shortened if the mixing amount is less than 2% by weight, and the workability will be reduced due to the rapid curing time if the mixing amount exceeds 5% by weight.

[0127] If necessary, 5 to 20 parts by weight of water can also be mixed into 100 parts by weight of the protective coating material 15.

[0128] Similarly, on the heat-induced section 16 formed by the differential pipeline concrete 10, a mixture of 24-45 parts by weight of calcium hydroxide binder (made from Portland cement, alumina cement, and blast furnace slag), 30-45 parts by weight of silica sand, 0.1-2 parts by weight of mica, 0.05-0.5 parts by weight of water-reducing agent, 0.80-0.5 parts by weight of silicon carbide fiber, and 0.5 parts by weight of silica fume (KOH) is filled into the pipeline section repair mortar composition 13, which consists of a kettle, a defoamer, and silica gel (5-10 parts by weight). This repairs the heat-induced section 16 and prevents the penetration of harmful components, carbon dioxide, and moisture, which would otherwise reduce the durability of the pipeline concrete 10. This not only improves the torsional and adhesion strength but also enhances the impact resistance, neutralization resistance, chemical resistance, acid resistance, and pollution resistance of the differential pipeline concrete 10. Meanwhile, by improving the adhesion of the differential pipeline concrete 10, damage such as cracks and peeling can be prevented from occurring after maintenance and reinforcement work. Therefore, the durability of the vehicle-to-vehicle pipeline concrete 10 is ensured, and its service life can be extended.

[0129] According to various embodiments of the present invention, a process for single-sided repair and reinforcement of concrete using a single-sided repair mortar composition 13 for differential pipework is described as follows:

[0130] First, refer to Figure 2 It can remove the deteriorated part (not shown) S1 formed in the concrete 10 of the collection pipeline.

[0131] The heated portion can be removed using rock drills, grinding machines, and crushers.

[0132] Therefore, a heat-generating section 16 is formed on the concrete 10 of the distribution pipe.

[0133] Figure 1The four deteriorated sections 16 shown are referred to as deteriorated sections in turn to facilitate understanding of the recessed connection morphology in the example. However, the shape or form of the deteriorated section 16 may vary due to the concrete deterioration caused by the concrete 10 of the secondary manifold.

[0134] Secondly, corrosion S2 of the reinforcing steel bars 11 arranged inside the concrete 10 of the difference pipeline can be eliminated.

[0135] The corroded parts of the reinforcing bar 11 can be cleaned using a brush and a grinding wheel.

[0136] Furthermore, the deteriorated section 16 and the reinforcing steel surface S3 formed on the concrete 10 of the collection pipeline can be cleaned with high-pressure water.

[0137] At this time, the heat-induced section 16 formed on the concrete 10 of the differential pipeline and the surface of the reinforcing steel can be cleaned by high-pressure water sprayed by a high-pressure water cleaner (not shown) to remove foreign objects.

[0138] Secondly, the anti-theft material 12 can be used on the steel bar 11 for anti-theft treatment S4.

[0139] The dustproof material 12 may be composed of 20-40% by weight of ceramic powder, 25-40% by weight of acrylic emulsion, 10-30% by weight of epoxy and 15-25% by weight of silicone.

[0140] In this state, new and old adhesives 14S5 can be sprayed onto the heat-generating section 16 formed by the secondary manifold concrete 10 filled with the composition 13.

[0141] The new and old adhesives 14 can be uniformly sprayed using a brush, sprayer, and echo gun on the heat-transfer section 16 formed by the concrete of the distribution pipe 10. That is, the spraying amount of the new and old adhesives 14 can reach 0.36 kg / m³. 2 .

[0142] Secondly, a mortar composition 13 for repairing the cross-section of a tea collection pipeline is formed by mixing Portland cement (30-50 parts by weight), alumina cement (10-20 parts by weight), blast furnace slag (10-20 parts by weight) in a certain weight ratio, calcium hydroxide binder (24-45 parts by weight), silica sand (30-45 parts by weight), mica (0.1-2 parts by weight), water-reducing agent (0.05-0.5 parts by weight), silicon carbide (SiC) fiber (0.1-8.0 parts by weight), polymer resin (0.5-0.1 parts by weight), potassium hydroxide (KOH) (part by weight), silica gel (part by weight), silica fume (part by weight), and silica fume bag (10-30-0.1 parts by weight). When mixed with water, it can repair the heat-induced cross-section 16S6 formed by the concrete 10 of the tea collection pipeline.

[0143] For example, the composition 13 can be filled into the heat-affected section 16 formed by the concrete 10 of the secondary manifold for repair.

[0144] The filling thickness of the single-sided repair mortar composition 13 for the vehicle manifold pipeline can reach more than 10 mm.

[0145] Furthermore, the concrete surface of the collection pipeline 10 can be finished with a protective coating material 15 for the finishing treatment S7.

[0146] For example, the protective coating material 15 may include a tower jacket, and the protective coating material 15 may be uniformly sprayed twice on the surface of the secondary manifold concrete 10 using a brush, sprayer, and echo gun. That is, after the protective coating material 15 is sprayed once, if the worker's fingertips are confirmed to be dry by touch, it can be sprayed twice.

[0147] The protective coating material may include 25-30% by weight of silicate, 40-60% by weight of mineral powder that radiates far-infrared rays, 10-20% by weight of epoxy binder, and 2-5% by weight of curing agent.

[0148] Similarly, by removing the deteriorated parts of the collector pipe concrete, eliminating the corrosion of the reinforcing steel 11, cleaning with high-pressure water, applying anti-theft material 12 to the reinforcing steel 11, spraying new and old adhesives 14, repairing the deteriorated section 16 formed by the collector pipe concrete 10 using a single-sided repair mortar composition 13, and applying a protective coating material 15, these processes can be carried out on the collector pipe concrete 10, allowing for reinforcement under harsh environmental conditions. This ensures stable adhesion of the concrete on the collector pipe 10, while the composition 13 may also exhibit excellent physical and chemical properties such as increased strength, resistance to neutralization, shrinkage crack inhibition, impact / damage resistance, wear / erosion resistance, freeze-thaw resistance, and heat recovery. Therefore, the collector pipe concrete 10 can improve the quality of section repair and reinforcement work.

[0149] Furthermore, there is no need for repeated maintenance and construction of the secondary manifold concrete 10, which can save on the maintenance and reinforcement costs of the secondary manifold concrete 10.

[0150] The following description provides more specific examples of the single-sided repair mortar composition for manifolds according to the present invention, but does not limit the invention based on the examples given below.

[0151] <Implementation Example 1>

[0152] A single-sided repair mortar composition for vehicle manifolds is prepared by: 1) mixing Portland cement (40 parts by weight), alumina cement (10 parts by weight), and blast furnace slag powder (10 parts by weight) in a specific weight ratio to prepare a calcium hydroxide binder; 2) mixing calcium hydroxide binder (35 parts by weight), silica sand (35 parts by weight), mica (1.5 parts by weight), water-reducing agent (0.3 parts by weight), silicon carbide (SiC) fiber (SiC), polyvinyl alcohol, calcium hydroxide (KOH) (4.0 parts by weight), silica gel (KOH) (4.0 parts by weight), and silica gel (4.0 parts by weight); 3) mixing 15 parts by weight of water into 100 parts by weight of the single-sided repair mortar composition for vehicle manifolds; 4) uniformly stirring hydrophobic silica gel for 20 minutes to ensure uniform mixing within the water-containing mortar composition, forming a repairable section 16 on the concrete 10 of the vehicle manifold, thus preparing a single-sided repair mortar composition for vehicle manifolds containing filling water.

[0153] To make it easier to understand the characteristics of Embodiment 1, comparative examples that can be compared with Embodiment 1 of the present invention are given. The following comparative examples 1 and 2 are commonly used ordinary cement mortar compositions and polymer cement mortar compositions.

[0154] <Comparison Example 1>

[0155] The ordinary cement mortar composition can be mixed to produce 40 parts by weight of ordinary cement, 50 parts by weight of residual aggregate and 10 parts by weight of water.

[0156] <Comparison Example 2>

[0157] Polymer cement mortar compositions are generally prepared by premixing 40 parts by weight of cement, 50 parts by weight of residual aggregate and 4 parts by weight of polyacrylate using a vacuum forced mixer, then adding 6 parts by weight of water and mixing for 2 minutes using a forced mixer.

[0158] The test examples below show the experimental results of comparing the characteristics of the embodiment of the present invention with those of Comparative Example 1 and Comparative Example 2, so as to more easily grasp the characteristics of the embodiment of the present invention.

[0159] <Exam Example 1>

[0160] To compare the physical properties of the single-sided repair mortar composition for manifolds manufactured according to Example 1 and the cement mortar composition manufactured according to Comparative Example 1, the compressive strength, torsional strength, tensile strength and adhesive strength of the single-sided repair mortar composition for manifolds manufactured according to Example 1 and the cement mortar compositions manufactured according to Comparative Examples 1 and 2 were tested according to KSF2476 (Test Method for Polymer Cement Mortar), and the results are shown in Table 1.

[0161] Table 1

[0162]

[0163] As shown in Table 1 above, the compressive strength, torsional strength, tensile strength and bond strength of the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 are significantly higher than those of the cement mortar compositions manufactured according to Comparative Example 1 and Comparative Example 2.

[0164] The single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 is significantly superior in strength compared to the cement mortar composition manufactured in the comparative example.

[0165] <Exam Example 2>

[0166] The length change rate of the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 and the cement mortar composition manufactured according to Comparative Examples 1 and 2 was measured using a KS F2476, and the results are shown in Table 2 below.

[0167] Table 2

[0168] Experimental Project Test methods Example 1 Comparative Example 1 Comparative Example 2 Length change rate (%) KS F 2476 0.01 0.13 0.11

[0169] As shown in Table 2 above, the single-sided repair mortar composition for secondary manifolds manufactured according to Example 1 shows a reduction in drying shrinkage compared to the cement mortar compositions manufactured according to Comparative Examples 1 and 2, thus exhibiting a shrinkage reduction effect.

[0170] <Exam Example 3>

[0171] The absorption rate of the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 and the cement mortar compositions manufactured according to Comparative Examples 1 and 2, measured according to the method specified in KS F2476, is shown in Table 3 below. High water absorption was observed, allowing impurities or water to penetrate into the concrete, leading to increased porosity and structural damage.

[0172] Table 3

[0173] distinguish Test methods Example 1 Comparative Example 1 Comparative Example 2 Water absorption rate (%) KS F 2476 0.2 2.7 1.8

[0174] As shown in Table 3 above, the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 has a lower water absorption rate compared to the cement mortar compositions manufactured according to Comparative Example 1 and Comparative Example 2.

[0175] <Exam Example 4>

[0176] The chloride ion penetration depth test of KS F2476 was conducted on the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 and the cement mortar compositions manufactured according to Comparative Examples 1 and 2. The results are shown in Table 4 below.

[0177] Table 4

[0178] Experimental Project Test methods Example 1 Comparative Example 1 Comparative Example 2 Chloride ion penetration depth (mm) KS F 2476 0.6 2.5 1.5

[0179] As shown in Table 4 above, the single-sided repair mortar composition for secondary manifolds manufactured according to Example 1 has a smaller chloride ion penetration depth compared to the cement mortar compositions manufactured according to Comparative Examples 1 and 2, which confirms its higher resistance to salt damage.

[0180] <Exam Example 5>

[0181] The KS F2476 neutralization depth test was conducted on the mortar composition for maintenance of differential pipe sections manufactured according to Example 1 and the cement mortar composition manufactured according to Comparative Example 1 and Comparative Example 2. The results are shown in Table 5 below.

[0182] Table 5

[0183] Experimental Project Test methods Example 1 Comparative Example 1 Comparative Example 2 Neutralization depth (mm) KS F 2476 0.2 1.5 1.2

[0184] As shown in Table 5 above, the single-sided repair mortar composition for secondary manifolds manufactured according to Example 1 has a smaller neutralization penetration depth compared to the cement mortar compositions manufactured according to Comparative Examples 1 and 2, which confirms its high resistance to neutralization.

[0185] <Exam Example 6>

[0186] The single-sided water-retaining mortar composition for vehicle manifolds manufactured according to Example 1 and the cement mortar composition manufactured according to Comparative Examples 1 and 2 were deposited on the engineering body for 28 days according to the original Japanese Industrial Standard [Method for Solution Deposition Resistance Test of Concrete], using an aqueous solution of 2% hydrochloric acid, 5% sulfuric acid and 45% sodium hydroxide. The results of the resistance test are shown in Table 6 below.

[0187] Table 6

[0188]

[0189] As shown in Table 6 above, the single-sided repair mortar composition for secondary manifolds manufactured according to Example 1 showed a smaller rate of weight change in resistance to chemical resistance compared to the cement mortar compositions manufactured according to Comparative Examples 1 and 2, confirming its higher resistance to chemical resistance.

[0190] <Exam Example 7>

[0191] The results of the freeze-thaw resistance test, conducted according to the method specified in KS F2456, for the single-sided repair mortar composition for vehicle manifolds manufactured in Example 1 and the cement mortar compositions manufactured in Comparative Examples 1 and 2, are shown in Table 7 below. Freeze-thaw refers to the freezing and thawing of water absorbed by concrete through capillaries. Repeated freeze-thaw cycles can lead to microcracks in the concrete structure, resulting in decreased durability. Table 7 shows the durability indices of the examples and comparative examples in the freeze-thaw resistance test.

[0192] Table 7

[0193]

[0194]

[0195] As shown in Table 7 above, the durability index of the single-sided repair mortar composition for vehicle manifolds manufactured according to Example 1 is significantly improved compared with the cement mortar compositions manufactured according to Comparative Example 1 and Comparative Example 2, indicating that the durability has been improved.

[0196] The single-sided repair mortar compositions for secondary manifolds and the single-sided concrete repair and reinforcement processes using the same as described above in various embodiments of the present invention are not limited to the foregoing embodiments and drawings. Various substitutions, modifications and alterations can be made within the technical scope of the present invention, which will be obvious to those skilled in the art to which the present invention pertains.

Claims

1. A single-sided repair mortar composition for vehicle collection pipelines, used for repairing deteriorated concrete sections of collection pipelines that guide sewage or wastewater to a sewage treatment plant, characterized in that, The single-sided repair mortar composition for vehicle and pipeline systems consists of a mixture of Portland cement (30-50 parts by weight), aluminum powder cement (10-20 parts by weight), blast furnace slag (10-20 parts by weight), calcium hydroxide binder (24-45 parts by weight), silica sand (30-45 parts by weight), mica (20 parts by weight), silica sand (silica fume) (30-45 parts by weight), calcium hydroxide (Ca(OH)2) (4-33 parts by weight), potassium hydroxide (KOH) (4-33 parts by weight), silica fume cement (0.1-3 parts by weight), encapsulating agent (0.1-3 parts by weight), and silica fume aerogel (5-10 parts by weight), and is used in combination with water.

2. The single-sided repair mortar composition for vehicle manifolds according to claim 1, characterized in that, The polymer resin is a water-soluble resin or a water-dispersible resin. The water-soluble resin is one or more selected from polyvinyl alcohol (PVA), polyacrylonitrile ester, polyacrylamide, polyacrylic acid, and polyethylene glycol. The water-dispersible resin is one or more selected from vinyl phenyl acetate (EVA) and styrene-butadiene rubber (SBR).

3. A concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle collection pipelines, characterized in that, in the process of repairing and reinforcing the deteriorated concrete section of a collection pipeline that guides sewage or wastewater to a sewage treatment plant, the process is as follows: The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds includes: The process includes: removing deteriorated sections of the concrete in the pipe network; eliminating corrosion of the reinforcing steel inside the concrete in the pipe network; cleaning the heat-affected sections and the surface of the reinforcing steel in the concrete of the pipe network with high-pressure water; applying anti-theft materials to the reinforcing steel for anti-theft treatment; spraying new and old adhesives onto the surface of the concrete in the pipe network; using a pipe cross-section repair mortar composition mixed with water and 30-50 parts by weight of Portland cement, 10-20 parts by weight of alumina cement, 10-20 parts by weight of blast furnace slag, 24-45 parts by weight of calcium hydroxide binder, 30-45 parts by weight of silica sand, 0.1-2 parts by weight of mica, 0.05-0.1 parts by weight of water-reducing agent, 0.1-8.0 parts by weight of silicon carbide (SiC) fiber, 0.5-1.0 parts by weight of polymer resin, 4-0.1 parts by weight of potassium hydroxide (KOH), and silica fume to repair the deteriorated sections of the concrete in the pipe network; and applying a protective coating material to the surface of the concrete in the pipe network.

4. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3, characterized in that, The polymer resin is a water-soluble resin or a water-dispersible resin. The water-soluble resin is one or more selected from polyethylene glycol (PVA), polyacrylonitrile ester, polyacrylamide, polyacrylic acid, and polyethylene glycol. The water-dispersible resin is one or more selected from vinyl acetate (EVA) and styrene-butadiene rubber (SBR).

5. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, During the removal of the deteriorated concrete sections of the collection pipeline, rock drills, grinding wheels, and crushers are used to remove the deteriorated sections.

6. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, During the process of removing corrosion from the steel reinforcement inside the concrete of the distribution pipe, the steel reinforcement is cleaned with a brush and a funnel to remove the corrosion. During the process of cleaning the heat-affected section of the concrete of the distribution pipe and the surface of the steel reinforcement with high-pressure water, the heat-affected section of the concrete of the distribution pipe and the surface of the steel reinforcement are cleaned with high-pressure water sprayed by a high-pressure water cleaner to remove foreign matter.

7. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, In the process of using anti-theft materials to treat the steel bars, the anti-theft materials consist of 20-40% by weight of ceramic powder, 25-40% by weight of acrylic emulsion, 10-30% by weight of epoxy and 15-25% by weight of silicone.

8. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, During the process of spraying new and old adhesives onto the heat-affected section of the concrete in the distribution pipe, the new and old adhesives are uniformly sprayed onto the heat-affected section of the concrete in the distribution pipe using a brush, sprayer, and echo gun. The spraying amount of the new and old adhesives is 0.36 kg / m. 2 .

9. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, During the process of repairing the deteriorated section of the cross-section using the single-sided repair mortar composition for the differential pipeline, the filling thickness of the single-sided repair mortar composition for the differential pipeline is 10 mm or more.

10. The concrete section repair and reinforcement process using a single-sided repair mortar composition for vehicle manifolds according to claim 3 or 4, characterized in that, The protective coating material consists of 25-30% silicate, 40-60% mineral powder that radiates far-infrared rays, 10-20% epoxy binder, and 2-5% curing agent.

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