KR102593197B1 - Method for manufacturing high-strength concrete block resistant to salt and smart road pavement system using the same - Google Patents

Abstract

The present invention relates to a high-strength concrete block that is resistant to salt and a method of manufacturing the same, wherein a primary mixture is prepared by mixing Portland cement, which hardens when mixed with water, fine powder of blast furnace slag, and reinforcing aggregate mixed with fine aggregate and coarse aggregate. process; A second process of preparing a secondary mixture by mixing additional cement and admixture with the primary mixture obtained in the first process; Step 3: forming a concrete block by injecting the secondary mixture into a mold and curing it; Step 4 of immersing the concrete block cured after the above 3 steps in a tank storing the additive solution, then taking it out and putting it into a dryer to dry the surface; It includes step 5 of forming a primary coating film by applying a corrosion inhibitor to the concrete block obtained in step 4, and forming a secondary coating film by applying a waterproofing agent to the upper surface of the primary coating film.

Description

Method for manufacturing high-strength concrete block resistant to salt and smart road pavement system using the same}

The present invention relates to a method of manufacturing high-strength concrete blocks resistant to salt and a smart road paving system using the same.

In general, corrosion factors such as chlorine ions, sulfates, and moisture present in seawater penetrate directly into concrete structures used in the marine environment, which causes salt damage caused by corrosion of the reinforcing bars and cracks in the covering concrete.

In particular, chlorine ions are known to be the most harmful component to corrosion of steel materials. Damage to such concrete structures is directly linked to corrosion of embedded reinforcing bars due to internal and external factors such as chlorine ions and sea sand infiltrating from the outside.

Currently, in order to prevent salt damage to marine concrete structures in Korea, the concrete standard specifications recommend the use of mixed cement such as blast furnace slag cement and fly ash cement, or medium-heat Portland cement specified in KSL 5201.

To date, various methods have been developed to prevent salt damage and corrosion deterioration of marine concrete structures and to restore the performance of deteriorated concrete. The most representative method is the immobilization method of chlorine ions.

This method includes a method using organic substances such as glycol ether and amino alcohol derivatives, and a method using nitrous acid-based inorganic substances. However, this method alone cannot sufficiently block deterioration factors that enter through cracks.

Republic of Korea Patent Registration No. 10-1547661 discloses “non-shrinkage underwater non-separable mortar composition.”

The prior patent is for ordinary Portland cement, which includes fine aggregate, fast-hardening CSA, fluidizing agent, calcium oxide, water-soluble thickener, silica fume, anti-foaming agent, calcium nitrite, polybutadiene, trimethylated silica, and palladium.

However, the concrete composition according to the prior art had the disadvantage of not sufficiently satisfying the physical properties required for the construction of marine structures, such as salt resistance, crack resistance, resistance to material separation, and workability.

In reinforced concrete structures built on the coast, the arsenate content increases over the years, reaching several times the amount of salt mixed in from each material during concrete manufacturing. In general, the amount of arsenate in the atmosphere is high up to 200 m from the coast in the direction of land, and tends to decrease rapidly around 300 to 400 m.

When chloride present in seawater penetrates into the concrete, it accelerates the corrosion of the reinforcing bars of the concrete structure, so there was a problem in which durability deteriorated rapidly compared to inland concrete structures.

Korean Patent Application No. 10-2015-0022071

The present invention was made to solve the problems of the prior art, and provides salt-resistant high-strength concrete blocks and their The purpose is to provide a manufacturing method.

The object of the present invention described above is a first step of producing a primary mixture by mixing Portland cement, which hardens when mixed with water, fine powder of blast furnace slag, and reinforcing aggregate mixed with fine aggregate and coarse aggregate; A second process of preparing a secondary mixture by mixing additional cement and admixture with the primary mixture obtained in the first process; Step 3: forming a concrete block by injecting the secondary mixture into a mold and curing it; Step 4 of immersing the concrete block cured after the above 3 steps in a tank storing the additive solution, then taking it out and putting it into a dryer to dry the surface; A high-strength concrete block resistant to salt comprising a 5th step of applying a corrosion inhibitor to the concrete block obtained in the 4th step to form a primary coating film, and applying a waterproofing agent to the upper surface of the first coating film to form a secondary coating film. It can be achieved by the manufacturing method.

The additive solution in the above 4 processes is a mixture of water and additives, and the additives are any one or a mixture of two or more selected from the group consisting of silicon carbide, clay, mullite, graphite, chamotte, and silicon nitride.

The additional cement is a main material mixed with limestone and clay, silicon oxide (Si0 ₂ ), aluminum oxide (Al ₂ 0 ₃ ), iron oxide (Fe ₂ O ₃ ), calcium oxide (CaO), magnesium oxide (MgO), oxide It is characterized in that it contains one or more auxiliary materials selected from the group consisting of sulfur (SO ₃ ).

The mixture is one or more selected from the group consisting of alite (C ₃ S), belite (C ₂ S), aluminate (C ₃ A), and ferrite (C ₄ AF). It is characterized by being

The fine aggregate in the above process 1 is steel (metal grains) with an assembly ratio of 2.7 to 3.1 and a specific gravity of 2.62, and the coarse aggregate is characterized by a particle size of 20 to 30 mm with an assembly ratio of 7.06 to 8.02 and an absorption rate of 0.4%.

The corrosion inhibitor in step 5 includes an aqueous orthophosphoric acid (H ₃ PO ₄ ) solution, isopropyl alcohol, sodium nitrate, tannic acid, zinc nitrate, and a surfactant.

The waterproofing agent in step 5 includes polyurethane, sodium fluoride, amino resin, epoxy resin, and low shrinkage agent.

The low shrinkage agent is characterized in that it is selected from the group consisting of polyvinyl acetate, saturated polyester, and vinyl chloride.

The dryer includes an enclosure having an inlet and an outlet, a frame mounted horizontally within the enclosure, a main roller and a driven roller rotatably mounted on both sides of the frame, and a main pulley formed on the axis of rotation of the main roller and the axis of rotation of the driven roller. A transport unit consisting of a driven pulley formed in the main pulley and the driven pulley and a chain belt mounted horizontally, a plurality of air injection nozzles formed on the inner upper and lower surfaces of the enclosure, and a plurality of air injection nozzles It is characterized by comprising an air supply unit that supplies warm air to the enclosure, and a plurality of UV light source units formed on the inner ceiling of the enclosure.

According to the present invention, it is possible to manufacture a high-strength concrete block that is resistant to salt by being able to withstand salt damage even when in contact with seawater or seawater evaporation air and to prevent degradation of durability, and to strengthen the durability and extend the life of the concrete structure to which it is applied. It works.

1 is a process flow diagram showing a method of manufacturing a high-strength concrete block resistant to salt according to the present invention;
Figure 2 is a view of a dryer applied to the production of salt-resistant high-strength concrete blocks of the present invention;
Figure 3 is a diagram showing a smart road pavement quality control system using concrete blocks according to the invention.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. However, various changes can be made to the embodiments, so the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents, or substitutes for the embodiments are included in the scope of rights.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only and may be modified and implemented in various forms. Accordingly, the embodiments are not limited to the specific disclosed form, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical spirit.

Terms such as first or second may be used to describe various components, but these terms should be interpreted only for the purpose of distinguishing one component from another component. For example, a first component may be named a second component, and similarly, the second component may also be named a first component.

When a component is referred to as being “connected” to another component, it should be understood that it may be directly connected or connected to the other component, but that other components may exist in between.

The terms used in the examples are for descriptive purposes only and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the embodiments belong. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in the present application, should not be interpreted in an ideal or excessively formal sense. No.

In addition, when describing with reference to the accompanying drawings, identical components will be assigned the same reference numerals regardless of the reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiments, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the embodiments, the detailed descriptions are omitted.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms. The present embodiments only serve to ensure that the disclosure of the present invention is complete and that common knowledge in the technical field to which the present invention pertains is not limited. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are the same as those commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. It has meaning. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the embodiments of the present invention, have an ideal or excessively formal meaning. It is not interpreted as

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When ‘includes’, ‘has’, ‘consists of’, etc. mentioned in this specification are used, other parts may be added unless ‘only’ is used. When a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

When an element or layer is referred to as “on” another element or layer, it includes instances where the element or layer is directly on top of or intervening with another element. Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

Among the attached drawings, Figure 1 is a process flow diagram showing a method for manufacturing a salt-resistant high-strength concrete block according to the present invention, Figure 2 is a drawing of a dryer applied to the manufacturing of a salt-resistant high-strength concrete block of the present invention, and Figure 3 is a diagram showing a smart road pavement quality control system using concrete blocks according to the invention.

The method for manufacturing a high-strength concrete block resistant to salt according to the present invention,

Process 1 (S1) of producing a primary mixture by mixing Portland cement, which hardens when mixed with water, fine blast furnace slag powder, and reinforcing aggregate mixed with fine and coarse aggregate;

A second process (S2) in which a secondary mixture is prepared by mixing additional cement and high-strength mixture with the primary mixture obtained in the first process (S1);

Step 3 (S3), where the secondary mixture is injected into the mold and hardened to form a concrete block;

Step 4 (S4), in which the cured concrete block after step 3 (S3) is immersed in a tank storing the additive solution, then taken out and placed in a dryer to dry the surface;

A corrosion inhibitor is applied to the concrete block obtained in step 4 (S4) to form a primary coating film, and a waterproofing agent is applied to the upper surface of the primary coating film to form a secondary coating film (step 5) (S5). .

Hereinafter, each of the above processes will be described in more detail.

[Process 1 (S1)]

A primary mixture is produced by mixing 70-80% by weight of Portland cement, 5-8% by weight of blast furnace slag fine powder, and 10-15% by weight of reinforcing aggregate.

Portland cement is made by mixing raw materials containing the main ingredients of lime, silica, alumina, and iron oxide in an appropriate ratio, melting a portion of the mixture, and adding gypsum to the sintered clinker to form a powder.

If Portland cement is less than 70% by weight, durability is reduced, and if it is more than 80% by weight, it is excessive and there is a risk that performance may not be met.

Blast furnace slag fine powder is a by-product generated during smelting of pig iron and is used as an admixture for Portland cement. Hardening is promoted by the action of calcium hydroxide and sulfate, which are cement hydration products, and can improve compressive strength.

If the blast furnace slag fine powder is less than 5% by weight, there is a risk of insufficient compressive strength, and if it is more than 8% by weight, it is excessive and there is a risk of quality deterioration.

Reinforcing aggregate is fine aggregate and coarse aggregate. The fine aggregate is steel (metal grains) with a coarse aggregate of 2.7 to 3.1 and a specific gravity of 2.62, and the coarse aggregate is crushed stone with a particle size of 20 to 30 mm with a coarse aggregate of 7.06 to 8.02 and an absorption rate of 0.4%.

If the reinforcing aggregate is less than 10% by weight, durability may be insufficient, and if it exceeds 15% by weight, it may be excessive and there is a risk of decreased hardness.

[2nd process (S2)]

A secondary mixture is prepared by mixing additional cement and admixture with the primary mixture obtained in step 1 (S1).

Preferably, based on 100 parts by weight of the primary mixture, 30 to 40 parts by weight of additional cement and 20 to 30 parts by weight of the admixture are mixed to prepare the secondary mixture.

Additional cement is a mixture of limestone and clay as the main material, silicon oxide (Si0 ₂ ), aluminum oxide (Al ₂ 0 ₃ ), iron oxide (Fe ₂ O ₃ ), calcium oxide (CaO), magnesium oxide (MgO), and sulfur oxide. It consists of one or more auxiliary materials selected from the group consisting of (SO3).

The main material is clinker obtained by calcining limestone and clay at 1400~1500℃.

If the amount of additional cement is less than 30 parts by weight, there is a risk that compressive strength, seawater resistance, and chemical resistance may be reduced, and if the amount of additional cement is more than 40 parts by weight, it is excessive and there is a risk that durability may be reduced.

The mixture may be one or more selected from the group consisting of alite (C ₃ S), belite (C ₂ S), aluminate (C ₃ A), and ferrite (C ₄ AF). You can.

By including the admixture, the additional cement has a slower hydration reaction rate than Portland cement, which has the effect of reducing the heat of hydration.

In addition, the additional cement mixed with the admixture has a high content of silicon oxide (SiO2) and the amount of aluminate phase (C3A), which reduces the performance of concrete by reacting with sulfate to produce ettringite, is reduced to the level of 5 types of sulfate-resistant cement. Sulfate resistance may be improved.

If the mixture is less than 20 parts by weight, there is a risk that the durability of the concrete may be insufficient, and if it is more than 30 parts by weight, it is excessive and there is a risk of deterioration in the performance of the concrete.

[Process 3 (S3)]

The secondary mixture is injected into a mold and hardened to form a concrete block.

The mold is manufactured into various shapes as needed, and concrete blocks suitable for the purpose of use are formed.

The frame has internal plates attached to the inner side and bottom.

The inner plate is made by mixing PVC powder with a first additive and a second additive to form a mixture, placing the mixture in a mold, and molding it into a film with a thickness of 2 to 3 mm, and the first additive is silica. It is a mixture of sol, isocyanate silane, and organic powder, and the second additive is a mixture of benzethonium chloride and benzalkonium chloride.

The inner plate assists in easy separation when the concrete block is separated from the mold after hardening, and the second additive has bactericidal properties and removes bacteria.

[4th process (S4)]

After step 3 (S3), the cured concrete block is immersed in a tank storing the additive solution, then taken out and placed in the dryer 100 to dry the surface.

The additive liquid is a mixture of water and additives, and the additives may be any one or a mixture of two or more selected from the group consisting of silicon carbide, clay, mullite, graphite, chamotte, and silicon nitride.

Mullite may be selected from kaolin-based, bauxite-based, or alumina-based or a mixture thereof.

Mullite has excellent stability at high temperatures, low thermal expansion, high creep resistance, stability against corrosion, strength, and fracture toughness.

Chamotte is a refractory material and is a fine particle produced by calcining ore kaolin at high temperature, and has high whiteness and light transmittance.

Silicon nitride is a heat-resistant ceramic.

Meanwhile, the dryer 100 includes an enclosure 120 having an inlet 121 and an outlet 122, a frame 142 mounted horizontally within the enclosure 120, and rotatably mounted on both sides of the frame 142. The main roller 143 and the driven roller 144, the main pulley 145 formed on the rotation axis of the main roller 143, the driven pulley 146 formed on the rotation axis of the driven roller 144, and the main pulley 145 ) and a driven pulley 146 connected to a horizontally mounted chain belt 147, a transport unit 140, and a plurality of air injection nozzles 150 formed on the inner upper and lower surfaces of the enclosure 120. It includes an air supply unit (not shown) that supplies warm air to a plurality of air injection nozzles 150, and a plurality of UV light source units 160 formed on the inner ceiling of the enclosure 120.

Since the chain belt 147 is made of a chain with multiple holes, it has excellent breathability, so the air sprayed from the upper and lower air injection nozzles 150 can dry the upper and lower parts of the concrete block (W) evenly. .

Harmful bacteria living on the concrete block (W) can be removed by ultraviolet rays irradiated from the UV light source unit 160.

[5th process (S5)]

A corrosion inhibitor is applied to the concrete block (W) obtained in step 4 (S4) to form a first coating film.

The first coating film can be coated on the surface by applying the corrosion inhibitor directly to the surface of the concrete block or by immersing the concrete block in the corrosion inhibitor and removing it.

According to one example, the corrosion inhibitor is 30 to 40 parts by weight of isopropyl alcohol, 0.3 to 3 parts by weight of sodium nitrate, 10 to 30 parts by weight of tannic acid, 0.03 to 0.4 parts by weight of zinc nitrate, based on 100 parts by weight of orthophosphoric acid aqueous solution. It consists of 0.3 to 2 parts by weight of activator.

Afterwards, a waterproofing agent is applied to the upper surface of the first coating film to form a secondary coating film.

According to one example, the waterproofing agent includes 70 to 80% by weight of polyurethane, 5 to 8% by weight of sodium fluoride, 5 to 10% by weight of amino resin, 5 to 8% by weight of epoxy resin, and 3 to 6% by weight of low shrinkage agent. .

Polyurethane has excellent weather resistance, chemical resistance, and electrical insulation.

If polyurethane is less than 70% by weight, there is a risk that waterproofing performance may be insufficient, and if it is more than 80% by weight, it is excessive and there is a risk of increased costs.

Sodium fluoride is primarily used as a filler and secondarily improves the durability of the waterproofing composition.

If sodium fluoride is less than 5% by weight, durability may be insufficient, and if it is more than 8% by weight, the strength of the waterproofing agent may be reduced.

Amino resin is oil resistant. It has excellent solvent resistance, is very hard, has high mechanical strength, and has excellent surface gloss.

If the amino resin is less than 5% by weight, mechanical strength such as tensile strength, bending strength, and compressive strength may be insufficient, and if it is more than 10% by weight, it may be excessive and the curing speed may be reduced.

Epoxy resin has excellent heat resistance, flame retardancy, adhesion, and bonding power.

If the epoxy resin is less than 5% by weight, there is a risk that the waterproofing function may be reduced due to insufficient bonding strength, and if it is more than 8% by weight, there is a risk of oxidation by oxygen in the air.

The low shrinkage agent is used to prevent the waterproofing agent from shrinking when cured, and may be selected from the group consisting of polyvinyl acetate, saturated polyester, and vinyl chloride.

If the low-shrinkage agent is less than 3% by weight, the shrinkage effect may be minimal, and if it is more than 6% by weight, it may be excessive and reduce performance.

Meanwhile, a smart road pavement quality control system using concrete blocks according to the disclosed invention can be implemented.

Referring to Figure 3, the smart road pavement quality control system using concrete blocks according to the present invention is,

An intelligent construction equipment unit (300) that provides the optimal movement path for construction equipment, enables compatibility and integration between equipment, and optimizes road construction through construction equipment control,

A collection and analysis unit 400 that collects and analyzes information on the site where the concrete block of the present invention is constructed to generate a high-precision digital 3D map through autonomous drone measurement and perform CPS-based on-site visualization;

A SOC road construction equipment automation unit (500) that controls autonomous construction equipment capable of high-precision work such as minimizing errors in the construction position and flatness of concrete blocks, and performs road quality management such as road flatness, compaction, and water content, and,

Smart road pavement quality management that receives various data from the intelligent construction equipment unit 300, construction site information collection and analysis unit 400, and SOC road construction equipment automation unit 500 and transmits them to the smart construction digital platform. It includes a unit 600.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

Therefore, other implementations, other embodiments, and equivalents of the claims also fall within the scope of the following claims.

S1: Process 1 S2: Process 2
S3: Process 3 S4: Process 4
S5: 5 processes 100: dryer
120: enclosure 140: transport unit
150: Air injection nozzle 160: UV light source unit

Claims (3)

Step 1 of producing a primary mixture by mixing Portland cement, which hardens when mixed with water, fine powder of blast furnace slag, and reinforcing aggregate mixed with fine aggregate and coarse aggregate;
A second process of preparing a secondary mixture by mixing additional cement and admixture with the primary mixture obtained in the first process;
Step 3: forming a concrete block by injecting the secondary mixture into a mold and curing it;
Step 4 of immersing the concrete block cured after the above 3 steps in a tank storing the additive solution, then taking it out and putting it into a dryer to dry the surface;
Step 5 of forming a primary coating film by applying a corrosion inhibitor to the concrete block obtained in Step 4, and forming a secondary coating film by applying a waterproofing agent to the upper surface of the primary coating film.
The mixture is
At least one selected from the group consisting of alite (C ₃ S), belite (C ₂ S), aluminate (C ₃ A), and ferrite (C ₄ AF),
The corrosion inhibitor in step 5 includes orthophosphoric acid (H ₃ PO ₄ ) aqueous solution, isopropyl alcohol, sodium nitrate, tannic acid, zinc nitrate, and surfactant,
The waterproofing agent in step 5 includes polyurethane, sodium fluoride, amino resin, epoxy resin, and low shrinkage agent,
The low shrinkage agent is selected from the group consisting of polyvinyl acetate, saturated polyester, and vinyl chloride,
The dryer
A housing having an inlet and an outlet,
A frame mounted horizontally within the enclosure, a main roller and a driven roller rotatably mounted on both sides of the frame, a main pulley formed on the rotation axis of the main roller and a driven pulley formed on the rotation axis of the driven roller, and the main pulley and the driven roller. A carrying unit consisting of a chain belt mounted horizontally by connecting a pulley,
A plurality of air injection nozzles formed on the inner upper and lower surfaces of the enclosure, an air supply unit that supplies warm air to the plurality of air injection nozzles,
Multiple UV light source units formed on the inner ceiling of the enclosure
A method of manufacturing a high-strength concrete block resistant to salt, comprising: According to clause 1,
The additive solution in the above 4 steps is a mixture of water and additives,
The additive is any one or a mixture of two or more selected from the group consisting of silicon carbide, clay, mullite, graphite, chamotte, and silicon nitride,
The additional cement in the above 2 process is
The main material is a mixture of limestone and clay,
A method of manufacturing a high-strength concrete block resistant to salt, comprising one or more auxiliary materials selected from the group consisting of silicon oxide, aluminum oxide, iron oxide, calcium oxide, magnesium oxide, and sulfur oxide.

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