KR20220150064A - Crackdown strip having crack healing pill for preventing diagonal tension crack and healing crack at the opening corner of concrete structure - Google Patents

Abstract

The present invention discloses a crackdown strip including a crack healing pill, capable of providing a diagonal tension crack generated at an opening corner of a reinforced concrete structure and improving maintenance efficiency and durability of a concrete structure by a crack healing effect of a self-healing pill based on an inorganic material or a calcium carbonate extraction bacteria. According to the present invention, the crackdown strip installed at the opening corner of the reinforced concrete structure includes: a bottom plate having an L-shaped bent unit mounted at the opening corner; a protrusion plate protruding from one end of a lower end of the bottom plate to the other end in a vertical direction; and a radial band positioned between the protrusion plate and an upper end of the bottom plate and connected to the upper surface of the bottom plate. A space between the radial band and the bottom plate is filled with mortar containing a pill-shaped material including a crack healing function.

Description

Crackdown strip having crack healing pill for preventing diagonal tension crack and healing crack at the opening corner of concrete structure

The present invention relates to a crack-down strip, and more particularly, to a crack-down strip for preventing sinusoidal cracking and crack healing installed at the corner of an opening of a reinforced concrete structure.

A sinusoidal crack that occurs in an opening in a reinforced concrete structure occurs when a volume change due to concrete drying shrinkage occurs, and the restrained stress is concentrated at the corner of the opening, and this stress exceeds the tensile strength of the concrete. To prevent this, conventionally, reinforcing bars have been reinforced at the corners of openings to prevent sine-shaped cracks, but this leads to an increase in material costs and labor costs due to the use of excessive rebar and difficulties in reinforcement. If not implemented, there is a problem in that the crack width and crack occurrence range continuously increase. It can lead to expansion of cracks and deterioration of concrete durability.

In particular, sign-shaped cracks in openings that are clearly visible to the outside can harm the aesthetics of the building. Procedures and costs may arise.

Registered Patent No. 1022708 relates to a stress dissipation curved plate for preventing cracks around an opening, which is provided with a rectangular stress scattering plate, but is configured to have an inlet hole and a support foot to protrude, so that it can be fixed to the reinforcing bar in the opening. However, there is no mention of a stress-dispersion curved plate capable of self-healing using microorganisms.

Registered Patent No. 1613702 relates to a stress distribution curved plate for preventing initial sinusoidal cracking around an opening, by forming a protruding elastic flow part on the top of the curved plate, and forming binding protrusions on both ends to protrude and fix it. Although a stress-dissipating curved plate that prevents initial sinusoidal cracking around the opening has been disclosed, there is no mention of a stress-dispersing curved plate capable of self-healing using microorganisms.

The present invention has been devised to solve the problems of the prior art described above, with the prevention of sinusoidal cracks occurring at the corners of the openings of the reinforced concrete structure, and the crack healing effect of the inorganic material or calcium carbonate precipitating bacteria-based self-healing ring An object of the present invention is to provide a crack down strip including a crack healing ring that improves maintenance efficiency and improves durability of concrete structures.

In addition, in reinforced concrete structures, cracks are prevented by dispersing the stress concentrated at the corners of openings, and crack healing rings made of non-reactive inorganic ring aggregates based on inorganic materials with the same properties as cement composite materials of concrete structures. (丸), by using a superabsorbent fiber-based crack healing ring (丸) that has a crack width control function and a microorganism-based crack healing ring (丸) that heals cracks by calcium carbonate precipitation, when cracks occur in the opening, We want to provide you with repair skills.

In order to solve the above problem, the present invention provides a crack-down strip installed at the corner of an opening in a reinforced concrete structure, comprising: a bottom plate having a bent part in a 'L' shape to be seated at the corner of the opening; a protrusion plate formed to protrude in a vertical direction from one end of the lower end of the bottom plate to the other end; and a radial band located between the protrusion plate and the upper end of the bottom plate, both ends of which are connected to the upper surface of the bottom plate; a ring-shaped ring having a crack healing function between the radial band and the bottom plate Provided is a crackdown strip filled with material-laden mortar.

In addition, the protrusion plate has a 'L' shape, the outside of the bent portion is curved, and provides a crack down strip, characterized in that a plurality of first concrete inlet holes are formed.

In addition, the radial band provides a crack-down strip, characterized in that a plurality of second concrete inlet holes are formed in a rectangular curved shape.

In addition, the crack-down strip provides a crack-down strip, characterized in that the polypropylene-based lightweight synthetic resin and recycled synthetic resin material.

In addition, the ring-shaped material provided with the crack healing function is a crack-down strip, characterized in that it includes a fine powder of blast furnace slag or fly ash, a CSA-based expander, a fine powder of calcium hydroxide (Ca(OH) ₂ ), alcohol, and a quick-setting agent. do.

In addition, the ring-shaped material with the crack healing function is a material in which bacteria having the ability to form biominerals are fixed to a porous body, fine powder of blast furnace slag or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol and grade It provides a crackdown strip, characterized in that it includes payment.

In addition, the ring-shaped material with the crack healing function is a material in which bacteria having the ability to form biominerals is fixed to a porous body, fine powder of blast furnace slag or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol, grade It provides a crack-down strip comprising a settlement and nylon (Nylon) fiber.

In addition, the ring-shaped material provided with the crack healing function provides a crack-down strip, characterized in that the double capsule is filled.

The present invention relates to a crack down strip, which includes a radial band and the crack down strip is formed in a specific shape to easily seat at the corner of the opening, prevents cracks in reinforced concrete structures, controls crack propagation in the oblique direction, and provides a sign It is possible to provide a crack-down strip capable of improving the aesthetics of a building by preventing cracks, preventing corrosion of reinforcing bars, and preventing deterioration of durability of concrete structures.

In addition, by filling the radial band with a mortar containing a ring-shaped material equipped with a crack healing function, the durability by healing cracks in the reinforced concrete structure is improved, and the safety of the crack healing material injected into the concrete is improved. It is possible to provide a crackdown strip with improved maintenance efficiency of the reinforced concrete structure.

1 is a photograph showing a conventional curved plate installed at the corner of an opening.
2 to 6 are a perspective view, a front view, a rear view, a left view, and a right view, respectively, of a crack-down strip according to an embodiment of the present invention.
7 is a photograph for explaining the dissolution of the shell capsule in the cured mortar in one embodiment of the present invention.
8 is a photograph showing the appearance of a double capsule containing an inorganic crack healing ring actually manufactured in the present invention.
9 to 12 are views for explaining the filling process of the mortar containing a ring-shaped material equipped with a crack healing function in the present invention. Fig. 11 shows the mortar to which the crack healing ring was put, and Fig. 12 shows the mortar to which the double capsule was put.
13 and 14 are photographs showing a state in which a crack-down strip product including a crack healing ring is installed in the present invention.
15 is a view showing an opening in which a crack-down strip is installed according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are given to similar parts throughout the specification, and the detailed configuration direction of the present invention will be described with reference to the drawings. In addition, throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

1 is a photograph showing a conventional curved plate installed at the corner of an opening. Referring to FIG. 1, in the prior art, when installing on the core of a wall, the installation process is difficult due to the interference of vertical and horizontal reinforcing bars, and it may cause aesthetic problems due to the cause of the occurrence of gombo when pouring concrete.

As a result of repeated research to solve the problems of the prior art and prevent sinusoidal cracks occurring in the openings of reinforced concrete structures, the present inventors have included a radial band and formed a crackdown strip in a specific shape, so that it is easily located at the corner of the opening. It is seated, prevents cracks in reinforced concrete structures, controls crack propagation in the inclined direction, improves the aesthetics of buildings by preventing sine-field cracks, prevents corrosion of reinforcing bars, and prevents deterioration of durability of concrete structures. Furthermore, by filling the mortar containing the crack healing ring inside the radial band, the durability by healing cracks in the reinforced concrete structure is improved, the safety of the crack healing material injected into the concrete is secured, and the maintenance of the reinforced concrete structure It has been found that management efficiency can be improved and led to the present invention.

2 to 6 are a perspective view, a front view, a rear view, a left view, and a right view, respectively, of a crack-down strip according to an embodiment of the present invention.

6, the crack down strip 100 installed at the opening corner 10 of the reinforced concrete structure according to the present invention has a 'L' shape, and the bent part 111 is at the opening corner 10. The bottom plate 110 to be seated; a protrusion plate 120 formed to protrude in a vertical direction from one end of the lower end of the bottom plate 110 to the other end; and a radial band 130 positioned between the protrusion plate 120 and the upper end of the bottom plate 110 , both ends of which are connected to the upper surface of the bottom plate 110 .

In the present invention, the bottom plate 110 is in close contact with the opening corner 10 to prevent the crackdown strip 100 from being separated from the opening corner 10 when concrete is introduced, and is formed in a 'L' shape and bent. The inner side of the part 111 is seated in close contact with the corner 10 of the opening. In addition, since the bottom plate 110 is easily seated in the corner 10 of the opening, it is possible to improve the workability, and to control the sine-shaped crack by not being separated from the corner of the opening 10 .

In addition, the width and thickness of the bottom plate 110 may be adjusted according to the horizontal and vertical lengths of the corners 10 of the openings to be installed.

In the present invention, the protruding plate 120 is formed to protrude vertically from one end to the other end of the lower end of the bottom plate 110 in order to block micro-cracks and the flow of moisture and air between the strip strip and the concrete surface.

The protrusion plate 120 has a 'L' shape, the outside of the bent part may be curved, and a plurality of first concrete inlet holes 121 may be formed in the protrusion plate 120 , and the formed first concrete inflow. When concrete flows into the ball 121, the crackdown strip 100 does not separate from the opening corner 10, and the protrusion plate 120 has a plurality of inlet holes formed in a mesh shape to disperse the surrounding stress. Adhesion to concrete can also be improved.

In the present invention, the radial band 130 is located between the top of the protrusion plate 120 and the bottom plate 110 in order to block cracks in the opening corner 10 and control crack propagation in the inclined direction, Both ends are connected to the upper surface of the bottom plate (110).

The radial band 130 may be a rectangular curved body, and a plurality of second concrete inlet holes 131 may be formed therein. A plurality of the second concrete inlet holes 131 may be formed so that the concrete can be completely filled in the crack down strip 100 , and the second concrete inlet hole 131 allows concrete to pass through the crack down strip 100 . ), it is possible to prevent sine-shaped cracks by dispersing stress at cracks and improving adhesion to concrete.

In the present invention, the material of the crack-down strip 100 is not particularly limited, but may preferably be a polypropylene-based or resin-based lightweight synthetic resin, or a recycled synthetic resin.

The crack-down strip according to the present invention is introduced with a technique of self-repairing the part when a crack occurs in the corner of the opening of the reinforced concrete structure. That is, in the present invention, a mortar containing a ring-shaped material having a crack healing function is filled between the radial band and the bottom plate.

The ring-shaped material provided with the crack healing function may be an inorganic material of a specific composition, a bacterial material, or a highly absorbent fiber-based material.

The inorganic material includes fine blast furnace slag powder or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol, and quick-setting admixture.

In the present invention, when cracks occur in the concrete after pouring the ring with crack healing function using mortar mixing, the cement-based inorganic material constituting the ring heals the cracked area through hydration reaction when moisture flows into the cracked area.

These crack-healing rings or self-healing rings are sequentially sprayed with alcohol and a quick-setting agent on the aggregate of inorganic materials including fine powder of blast furnace slag or fly ash and calcium hydroxide and CSA-based expandable material during the manufacturing process of the ring and hardened in the form of a ring, so that the cement composite material After filling in the form of mortar based on inorganic materials with the same properties as those of As the cohesive force is weakened by the abrupt agent, the surface of the annular aggregate is easily peeled off or collapsed when moisture enters the cracks in the concrete, thereby effectively inducing the hydration reaction of the cement-based inorganic material.

As such, the self-healing ring component combination that maintains the non-reactivity of inorganic materials when mixing concrete after filling with mortar and controls the reactivity to realize effective hydration of inorganic materials when concrete is cracked afterwards is fine powder of blast furnace slag or fly ash, CSA It was confirmed that it was ideal to include a type expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol, and a quick-setting admixture. In this case, the composition to maximize the reactivity control ability is as follows. The composition of the crack healing ring using fine blast furnace slag powder as a parent material is 43 to 55% by weight of fine blast furnace slag powder, 20 to 29% by weight of CSA-based expansion material, 3 to 12% by weight of fine calcium hydroxide powder, 17 to 23% by weight of alcohol, and 3 to rapid setting agent The composition of the crack healing ring using fine fly ash powder as a parent material is preferably 7 wt%, 43 to 55 wt% of fine fly ash powder, 20 to 29 wt% of CSA-based expansion material, 3 to 12 wt% of fine calcium hydroxide powder, 17 to alcohol 23% by weight, preferably 3 to 7% by weight of silicate quick-setting agent, and the composition of the crack healing ring using fine blast furnace slag powder and fly ash as a parent material is 21.5 to 27.5% by weight of fine blast furnace slag powder, 21.5 to 27.5% by weight of fly ash, It is preferable that 20 to 29% by weight of the CSA-based expansion material, 3 to 12% by weight of fine calcium hydroxide powder, 17 to 23% by weight of alcohol, and 3 to 7% by weight of a quick-setting agent.

Here, the specific properties of the material for maximizing the reactivity control ability are as follows. That is, the fine powder of the blast furnace slag has a density of 2.5 to 3 g/cm 3 and a fineness of 4,000 to 10,000 cm 2 / g, and the fly ash has a density of 1.8 to 2.1 g/cm 3 and a fineness of 3,000 to 8,000 cm 2 /g , The CSA-based expansion material has a density of 2.7 to 3 g/cm 3 , a fineness of 2,500 to 7,000 cm / g and a content of CaO of 48 to 53 wt%, the fine calcium hydroxide powder has a purity of 98% or more, and the alcohol has a concentration of 80 To 99% (v/v) of methyl alcohol is the most preferable, and the quick-setting admixture is a silicate-based liquid quick-setting admixture having a density of 1.1 to 1.4 g/cm3, and sodium silicate (Na ₂ SiO ₂ ·nH ₂ O) is most preferred. Confirmed.

In the present invention, the production of the crack healing ring is performed by sequentially spraying alcohol and a quick-setting agent on the aggregate of the inorganic material including the fine powder of blast furnace slag or fly ash and the CSA-based expanding material and calcium hydroxide, and hardening in the form of a ring.

That is, in the present invention, the preparation of the crack healing ring comprises the steps of (a) rotating and mixing blast furnace slag fine powder or fly ash, CSA-based expansion material and calcium hydroxide (Ca(OH) ₂ ) into a ventilation fan; (b) preparing an agglomerated material in the form of a ring by spraying alcohol; And (c) spraying and hardening the quick-setting agent on the surface of the ring-shaped material; including, the hydration reaction is suppressed within a short time during the concrete mixing process of the mortar containing the crack-healing ring, and after solidification, in the concrete structure for a long time After this has elapsed, it is possible to easily manufacture a crack healing ring that has a property of effectively inducing the hydration reaction of cement-based inorganic materials when moisture flows into the cracks in the concrete.

In this case, the size of the crack healing ring produced may have an average diameter of 0.5 to 5 mm, preferably 1 to 2 mm.

The bacterial material includes a material in which bacteria having the ability to form biominerals is fixed to a porous body, fine powder of blast furnace slag or fly ash, a CSA-based expansion material, fine calcium hydroxide (Ca(OH) ₂ ) powder, alcohol, and a quick-setting admixture.

When cracks occur in concrete after mixing and pouring when concrete is mixed, the crack healing ring containing bacterial material causes the biomineral formation reaction when the material having the ability to form biominerals constituting the ring is fixed to the porous body and moisture flows into the cracked area. Heal the cracks through

Here, the crack healing ring contains a fine powder of blast furnace slag or fly ash, a CSA-based expansion material, and a fine powder of calcium hydroxide (Ca(OH) ₂ ). Crack healing is also possible.

This crack healing ring is a material in which bacteria having the ability to form biominerals are fixed to a porous body during the manufacturing process of the ring, fine powder of blast furnace slag or fly ash, and an agglomerate of inorganic material including CSA-based expansion material and calcium hydroxide. By being cured in a ring shape, the non-reactivity during concrete mixing after filling in the form of mortar based on the inorganic material of the same properties as the cement composite material of the concrete structure, that is, the hydration reaction is suppressed within a short time during the concrete mixing process, After a long period of time has elapsed in the concrete structure after solidification, the cohesive force caused by alcohol and abrupt agents is weakened, so that the surface of the annular aggregate is easily peeled off or collapsed when moisture enters the cracks in the concrete, resulting in the reaction of bacterial biomineral formation and cement-based inorganics. It becomes possible to effectively induce the hydration reaction of the material.

In this way, when concrete is mixed, the non-reactivity of bacteria and inorganic materials is maintained, and when concrete is cracked, the effective biomineral formation reaction of bacteria and effective hydration reaction of inorganic materials is achieved. It was confirmed that it is preferable to include a material in which bacteria having biomineral-forming ability are fixed to a porous body, fine powder of blast furnace slag or fly ash, CSA-based expansion material, fine calcium hydroxide (Ca(OH) ₂ ) powder, alcohol, and a quick-setting admixture, at this time controlling the reactivity. In order to maximize the ability, 16.5 to 23.5 wt% of fine powder of blast furnace slag, 16.5 to 23.5 wt% of fly ash, 5 to 10 wt% of CSA-based expansion material, 3 to 12 wt% of fine calcium hydroxide powder, 17 to 23 wt% of alcohol, 3 to quick setter It can be made to have a composition of 7% by weight and 5 to 10% by weight of the material immobilized with bacteria.

Here, the specific properties of the material for maximizing the reactivity control ability are as follows. That is, the fine powder of the blast furnace slag has a density of 2.5 to 3 g/cm 3 and a fineness of 4,000 to 10,000 cm 2 / g, and the fly ash has a density of 1.8 to 2.1 g/cm 3 and a fineness of 3,000 to 8,000 cm 2 /g , The CSA-based expansion material has a density of 2.7 to 3 g/cm 3 , a fineness of 2,500 to 7,000 cm / g and a content of CaO of 48 to 53 wt%, the fine calcium hydroxide powder has a purity of 98% or more, and the alcohol has a concentration of 80 To 99% (v/v) of methyl alcohol is the most preferable, and the quick-setting admixture is a silicate-based liquid quick-setting admixture having a density of 1.1 to 1.4 g/cm3, and sodium silicate (Na ₂ SiO ₂ ·nH ₂ O) is most preferred. Confirmed.

In addition, as a porous material for bacteria immobilization in the present invention, a porous material having excellent cation exchange ability may be used, for example, at least one selected from the group consisting of expanded vermiculite, urethane, perlite and hydrogel may be used, Preferably expanded vermiculite may be used. In the case of the expanded vermiculite, it is preferable to use a density of 0.2 to 0.3 g/cm 3 in order to maximize the immobilization efficiency.

The materials for fixing bacteria presented in the present invention have the property of adsorbing organic matter by exchangeable cations (Mg ²⁺ , Ca ²⁺ , etc.) present on the surface of the material. absorb In addition, as the pH is 6 to 9, it is the most ideal material for the optimal environment composition for the growth of microorganisms.

An immersion process may be used in a container for adsorption of bacteria using the porous material, and for optimal absorption efficiency of bacteria in the immersion process, 1 to 30 parts by weight, preferably 5 to 20 parts by weight, based on 100 parts by weight of the bacterial culture medium. It can be carried out so that the porous material is completely immersed in the content.

In addition, the immersion process may be performed under negative pressure conditions. As the immersion process is performed under a negative pressure condition, the air present inside the porous material escapes and the bacterial culture solution easily penetrates into the immobilization material, that is, the immobilization material can contain a large amount of moisture and medium nutrients as well as bacteria.

The negative pressure condition may be applied in a manner of applying a negative pressure of 1 to 50 torr, preferably 10 to 30 torr, for 10 to 100 minutes, preferably 20 to 50 minutes. At this time, the humidity is preferably 50 to 70 %RH and the temperature is maintained at 10 to 30 ℃.

Here, the bacteria culture solution is put into the container, the porous material is immersed, and the bacteria culture solution is immobilized under a negative pressure condition, but by driving a rotating fan provided at the bottom of the container, the bacteria through the agitation of the immobilization material that can be introduced into the culture solution and suspended It is possible to evenly mix and immobilize nutrients in the culture medium.

The bacteria used in the negative pressure stirring type immobilization method described above are not particularly limited as long as bacteria suitable for the immersion process using the porous material under negative pressure stirring conditions, but preferably Sphingobacterium multivorum under negative pressure stirring conditions When used in the immersion process using a porous material, it was confirmed that a crack healing ring was prepared using this, and the biomineral formation reaction of bacteria was effectively realized when moisture was introduced at the crack occurrence site of concrete after concrete mixing and hardening.

Here, in the present invention, as a result of a study on a special medium composition to create an optimal culture environment for the bacteria, the Sphingobacterium multivorum is a yeast extract 0.05 to 1 based on 1 liter of purified water. g, in a medium containing 1 to 10 g of peptone and 10 to 30 g of urea, pH 5 to 9, 5 to 50 ° C. Incubated at a concentration of 10 ⁸ to 10 ¹⁰ cells / ml in an incubator was found to be ideal.

In the present invention, the production of the crack healing ring is a material in which bacteria having biomineral forming ability are fixed to a porous body, fine powder of blast furnace slag or fly ash, and an aggregate containing a CSA-based expansion material and calcium hydroxide. It is carried out through a process of hardening to form.

That is, in the present invention, the production of a bacterial material-based crack healing ring is performed by (a) a material in which bacteria having the ability to form biominerals are fixed to a porous body, fine powder of blast furnace slag or fly ash, a CSA-based expansion material, and calcium hydroxide (Ca(OH) ₂ ). Rotation-mixing by input to the ventilation fan; (b) preparing an agglomerated material in the form of a ring by spraying alcohol; And (c) spraying and curing the quick-setting agent on the surface of the ring-shaped material; Including, in the crack-healing ring concrete mixing process, the biomineral formation reaction of bacteria and the hydration reaction of the inorganic material are suppressed within a short time, and solidification After a long period of time has elapsed in the concrete structure, it is possible to easily manufacture a crack healing ring with properties that effectively induce the biomineral formation reaction of bacteria and the hydration reaction of cement-based inorganic materials when moisture enters the cracks in the concrete. do.

In this case, the size of the crack healing ring produced may have an average diameter of 0.5 to 5 mm, preferably 1 to 2 mm.

The highly absorbent fiber-based material is a material in which bacteria having biomineral-forming ability are fixed in a porous body, fine powder of blast furnace slag or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol, quick-setting admixture and nylon (Nylon) contains fibers.

Crack healing ring containing nylon fiber together with bacterial material is a biological material when cracks occur in concrete after mixing and pouring when concrete is mixed. In addition to healing the cracks through the mineral formation reaction, nylon fibers are attached to the surface of the ring, and the nylon fibers provide adhesion between the crack-healing ring and the concrete interface where cracks occur, minimizing the development of cracks. And it functions as a bridge, that is, controls the crack width so that the crack healing hydrate can be evenly distributed at the concrete interface.

Here, the crack healing ring also contains a fine powder of blast furnace slag or fly ash, a CSA-based expansion material, and a fine powder of calcium hydroxide (Ca(OH) ₂ ). Complex crack healing is also possible.

This crack healing ring is a material in which bacteria having the ability to form biominerals are fixed to a porous body during the manufacturing process of the ring, fine powder of blast furnace slag or fly ash, and an agglomerate of inorganic material including CSA-based expansion material and calcium hydroxide. At this time, by injecting and mixing nylon fibers and hardening them in a ring shape with nylon fibers attached to the surface, they are filled in the form of mortar based on inorganic materials with the same properties as the cement composite material of the concrete structure and are non-reactive when mixing concrete. In other words, during the concrete mixing process, hydration reaction is suppressed within a short time, and after a long period of time has elapsed in the concrete structure after solidification, the cohesive force due to alcohol and abrupt agents is weakened. As the surface is easily peeled off or collapsed, it is possible to effectively induce the biomineral formation reaction of bacteria and the hydration reaction of the cement-based inorganic material, minimize crack growth, and allow the crack healing hydrate to be evenly dispersed at the concrete interface.

In this way, when concrete is mixed, the non-reactivity of bacteria and inorganic materials is maintained, and when concrete is cracked later, the reactivity is controlled and effective crack width control, which implements an effective biomineral formation reaction of bacteria and an effective hydration reaction of inorganic materials. The combination of components of _the crack healing ring that allows the function of And it was confirmed that it is preferable to include nylon fibers. In this case, in order to maximize the reactivity control ability and crack width control ability, 16.5 to 23.5 wt% of fine powder of blast furnace slag, 16.5 to 23.5 wt% of fly ash, 5 to 10 CSA-based expansion materials Weight %, fine calcium hydroxide powder 3 to 12% by weight, alcohol 17 to 23% by weight, quick setting agent 3 to 7% by weight, bacteria fixed material 3 to 8% by weight, and nylon fiber 1 to 3% by weight. .

Here, the specific properties of the material for maximizing the reactivity control ability and crack width control ability are as follows. That is, the fine powder of the blast furnace slag has a density of 2.5 to 3 g/cm 3 and a fineness of 4,000 to 10,000 cm 2 / g, and the fly ash has a density of 1.8 to 2.1 g/cm 3 and a fineness of 3,000 to 8,000 cm 2 /g , The CSA-based expansion material has a density of 2.7 to 3 g/cm 3 , a fineness of 2,500 to 7,000 cm / g and a content of CaO of 48 to 53 wt%, the fine calcium hydroxide powder has a purity of 98% or more, and the alcohol has a concentration of 80 to 99% (v/v) of methyl alcohol is most preferable, and the quick-setting admixture is a silicate-based liquid quick-setting admixture having a density of 1.1 to 1.4 g/cm3, and sodium silicate (Na ₂ SiO ₂ ·nH ₂ O) is most preferred, and , The nylon fiber has a diameter of 0.001 to 0.02 mm, a length of 0.01 to 1 mm, an elastic modulus of 5,000 to 30,000 MPa, a density of 1.05 to 1.3 g/cm 3 , and a water absorption rate of 2.5 to 10% by weight.

In the present invention, the production of a high-absorbent fiber-based crack-healing ring is a material in which bacteria having biomineral forming ability are fixed to a porous body, fine powder of blast furnace slag or fly ash, and alcohol and a quick-setting agent are sequentially added to an aggregate comprising a CSA-based expansion material and calcium hydroxide. After spraying, nylon fibers are added and mixed, and it is carried out through a process of hardening into a ring shape.

That is, in the present invention, the production of the crack healing ring is (a) a material in which bacteria having biomineral forming ability are fixed to a porous body, fine powder of blast furnace slag or fly ash, a CSA-based expansion material, and calcium hydroxide (Ca(OH) ₂ ) to a ventilation fan. input and rotation-mixing; (b) preparing an agglomerated material in the form of a ring by spraying alcohol; (c) mixing by scattering nylon fibers on the surface of the material aggregated in a ring shape; and (d) spraying and curing the quick-setting agent on the surface of the material; Including the crack healing ring, in the concrete mixing process, the biomineral formation reaction of bacteria and the hydration reaction of inorganic materials are suppressed within a short time. To effectively induce the biomineral formation reaction of biominerals and the hydration reaction of cement-based inorganic materials, and to facilitate the manufacture of crack healing rings with the properties of minimizing crack propagation and uniformly dispersing crack healing hydrates at the concrete interface.

In the present invention, the ring-shaped material provided with the crack healing function may be used in the form of filling a double capsule, but the prepared ring-shaped material may be directly used for mortar mixing.

The outer capsule material for the double capsule production is not particularly limited, but preferably a material prepared by mixing 50 to 60 parts by weight of hypromellose (HPMC) and 1 to 2.5 parts by weight of purified water may be used. The internal volume of the capsule may be between 0.5 and 1 ml. As shown in Table 1 below, the outer capsule used for manufacturing double capsules has a characteristic of being completely dissolved within 30 minutes in various temperature environments (20° C. to 40° C.) depending on the contact time when in contact with moisture.

Immersion time (min) water temperature 20℃ 30℃ 40℃ 0

10

20

30

- -

Accordingly, when the shell capsule is put into a mortar formulation with a unit quantity of 160 kg/㎥ and a flow of 150 mm as shown in FIG. 7 (see FIG. 7 (a)), the shell capsule is dissolved at 1 day of age after curing (FIG. 7) In (b), the outer capsule is not visible) The inner input material is distributed in the pores inside the concrete without damage to the surface.

In the case of a double capsule containing an inorganic material, 0.30 g of an inorganic crack healing ring made with a particle diameter of 1 mm or less can be put inside the outer capsule, and in the case of a double capsule containing a bacterial material, 1 mm inside the outer capsule 0.25 to 0.40 g of a biomineral-forming bacterial material-based crack healing ring produced with a particle diameter of the following can be added, and in the case of a double capsule containing a hybrid material, an inorganic ring and a bacteria-based ring are mixed into the outer capsule, and the input The weight may be 0.15 to 0.22 g and 0.13 to 0.20 g, respectively. In the case of the hybrid double capsule, the crack healing effect by the hydration reaction of the inorganic material and the crack healing effect through the biomineral formation action of bacteria can be expected at the same time as the cracks in the concrete. 8 shows the appearance of a double capsule in which the actually manufactured inorganic crack healing ring is inserted.

The filling of the mortar containing the ring-shaped material with the crack healing function can be performed using a mold having a shape corresponding to the radial band, and in FIGS. 9 to 12, the crack healing function is provided in the present invention. The filling process of the mortar containing the ring-shaped material is shown.

The mixed composition of the mortar for applying the crack healing ring or double capsule is 10 to 20% by weight of water, 30 to 40% by weight of cement, 30 to 40% by weight of crushed sand having a particle size of 5 mm or less, crack healing ring Or it is preferable that the double capsule is 5 to 10% by weight.

9 to 12, the formulation is completed crack healing ring (P) or double capsule (DC) mortar (M) is filled inside the radial strip, that is, between the radial band 130 and the bottom plate 110 After installing the mold 200 for (see FIGS. 9 and 10), the mortar is poured (see FIGS. 11 and 12), and curing can be carried out in an environment of constant temperature and humidity for about 2 days. Crack healing ring crack down strip 100 that has been cured can be installed in the opening corner 10 immediately after removing the outer mold (200). 13 and 14 show a state in which a crack-down strip product including a crack healing ring is installed. The crack-healing ring mortar poured on the radial bottom plate of the strip corner is a material with the same properties as the concrete poured after being installed in the opening. It induces the activity of crack healing performance by the exposure of the ring and the inflow of moisture.

15 is a view showing an opening in which a crack-down strip is installed according to an embodiment of the present invention.

Referring to FIG. 15 , the crack-down strip 100 according to the present invention is installed at a corner around an opening where cracks intensively occur, thereby effectively controlling sinusoidal cracks occurring from the concrete surface due to concrete drying shrinkage.

In addition, the crackdown strip 100 can be fixed vertically to the opening and wall, or can be easily fixed to horizontal reinforcing bars, and is installed at the four corners around the opening to control signage cracks, etc., and to improve workability through simple construction. can

In addition, the crack-down strip 100 is, for example, installed around the 4 corners of the underground parking lot pillars to prevent crack propagation due to stress concentration at the pillar corners.

As described above, the crack-down strip 100 according to the present invention includes a radial band and is formed in a specific shape, so that it is easily seated on the corner of the opening 10, prevents cracking of the reinforced concrete structure, and prevents crack propagation in the oblique direction. It can control, improve the aesthetics of buildings by preventing cracks in the signage, prevent corrosion of rebar and prevent deterioration of durability of concrete structures. In addition, by filling the radial band with a mortar containing a ring-shaped material equipped with a crack healing function, the durability by healing cracks in the reinforced concrete structure is improved, and the safety of the crack healing material injected into the concrete is improved. It is possible to provide a crack down strip with improved maintenance efficiency of the reinforced concrete structure.

As above, preferred embodiments of the present invention have been described in detail with reference to the drawings. The description of the present invention is for illustrative purposes, and those of ordinary skill in the art to which the present invention pertains will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention.

Accordingly, the scope of the present invention is indicated by the following claims rather than the description of the invention, and all changes or modifications derived from the meaning, scope, and equivalent concept of the claims are interpreted as being included in the scope of the present invention. should be

100: crack down strip 110: bottom plate
111: bent part 120: protruding plate
121: first concrete inlet 130: radial band
131: second concrete inlet 10: opening corner
P: Crack healing ring DC: Double capsule
M: mortar

Claims (8)

A crack-down strip installed at the corner of an opening in a reinforced concrete structure, comprising:
a bottom plate in which a bent part in a 'L' shape is seated at the corner of the opening;
a protrusion plate formed to protrude in a vertical direction from one end of the lower end of the bottom plate to the other end; and
a radial band positioned between the protrusion plate and the top of the bottom plate, both ends of which are connected to the upper surface of the bottom plate;
including,
A crack-down strip filled with mortar containing a ring-shaped material having a crack healing function between the radial band and the bottom plate. According to claim 1,
The protrusion plate has a 'L' shape, the outer side of the bent portion is curved, and a plurality of first concrete inlet holes are formed. According to claim 1,
The radial band is a rectangular curved surface, crack-down strip, characterized in that a plurality of second concrete inlet holes are formed. According to claim 1,
The crack down strip is a crack down strip, characterized in that the polypropylene-based lightweight synthetic resin and recycled synthetic resin material. According to claim 1,
The ring-shaped material provided with the crack healing function is a crack-down strip, characterized in that it comprises a fine powder of blast furnace slag or fly ash, a CSA-based expansion material, a fine calcium hydroxide (Ca(OH) ₂ ) powder, alcohol, and a quick-setting admixture. According to claim 1,
The ring-shaped material with the crack healing function is a material in which bacteria having the ability to form biominerals is fixed to a porous body, fine blast furnace slag powder or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol and quick-setting agent Crackdown strip comprising a. According to claim 1,
The ring-shaped material with the crack healing function is a material in which bacteria having the ability to form biominerals are fixed to a porous body, blast furnace slag fine powder or fly ash, CSA-based expansion material, calcium hydroxide (Ca(OH) ₂ ) fine powder, alcohol, quick-setting agent And a crack-down strip comprising a nylon (Nylon) fiber. 8. The method according to any one of claims 1 to 7,
The crack-down strip, characterized in that the ring-shaped material provided with the crack healing function is filled in a double capsule.

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