KR20150034836A - repairing method of reinforced concrete structure using the mixer shaft - Google Patents

Abstract

The present invention relates to a repairing and a reinforcing method of concrete structures using a mixer shaft of a double auger in a pre-wetting spray manner, which supplies (1) a main material part and (2) a composition to a pre-wetting spraying apparatus having a mixer shaft to enable (1) the main material part and (2) the composition to be mixed and transferred at the same time wherein (1) the main material part comprises 10 parts by weight of Portland cement; 1-8 parts by weight of alumina cement; 10-20 parts by weight of a high strengthened fine powder mixing material; 5-10 parts by weight of red mud; and 1-10 parts by weight of ore, and a composition consists of (2) 5-20 parts by weight of a swelling agent, for 100 parts by weight of the main material par, (3) 5-10 parts by weight of a superplasticizer, (4) 1-5 parts by weight of an antifoaming agent and (5) 1-10 parts by weight of cellulose derivatives, thereby having outstanding strength and durability and being accordingly used in roads in which corrosion and erosion are frequently caused and having less contraction and a good watertight property and being accordingly used in cut-off structures like water-proof roof slab, a swimming pool and a purification plant.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repairing method of reinforcing concrete structure using a double auger mixer shaft,

In the method of repairing and reinforcing the reinforced concrete structure of free pre-wetting spray system using double auger mixer shaft which can be used for pre-wetting injection device and has excellent strength and durability and little shrinkage, .

Concrete has been widely used as a structural material in construction sites until now. Despite its excellent compressive strength, economical efficiency and durability, the concrete has a small tensile strength and bending strength and a small deformation capacity, which causes a drastic decrease in stress and durability after harmful cracking Have.

Particularly, the compressive strength of concrete and the tensile strength due to the corrosion of reinforcing steel are lowered due to various deterioration phenomena such as peeling, dropout and abnormal cracks occurring in concrete, resulting in damage of reinforcing concrete and further collapse, The problems of safety accidents, such as structural damage caused by corrosion of reinforcing bars, have been reported in newspapers and TV, and they have become a big social problem.

The deterioration factor and the deterioration phenomenon of these concrete are not caused by the corrosion of reinforcing steel because the concrete has strong alkalinity (pH = 12.5), but the penetration of carbonic acid gas, acidic substance, chloride, alkali aggregate reaction, / Shrinkage and rainwater infiltration), the concrete is neutralized, the corrosion of the reinforcing steel proceeds, the cracks are generated in the concrete due to the expansion of the rust, and the reinforced concrete structure is broken due to peeling and detachment, resulting in the collapse of the structure .

And concrete structures including various civil works and buildings are neutralized by penetration of carbon dioxide and acid rain, the phenomenon that the load-bearing capacity of the structure is lowered due to the cracking phenomenon of concrete and the corrosion of reinforcing bar is not only the penetration of carbon dioxide but also the pebbles It is known that when the sand is volcanic rock, the neutralization of the concrete accelerates.

Recently, as the safety of multi-use facilities has become a social concern along with the subsequent collapse of structures, the maintenance market has been greatly expanded due to the recognition of the need for maintenance of the structures.

Therefore, it is necessary to provide economical material and construction method which can protect the concrete from outside condition by extending the lifetime and at the same time maintaining the beauty of the concrete structure for a long time, thereby contributing to the beauty of each building or structure as well as the beauty of the city. .

Korean Patent No. 0690410 Korea Patent No. 1065209 Korean Patent No. 0975371

It is an object of the present invention to provide a composition for repairing and reinforcing a reinforced concrete structure that can be used in a pre-wetting spraying apparatus, has excellent strength and durability, and can be applied to various places with less shrinkage.

Another object of the present invention is to provide a repair and reinforcement method using the above-described composition for repair and reinforcement.

In order to accomplish the above object, the present invention provides a composition for repairing and reinforcing concrete structures, which can be supplied to a pre-wetting jetting apparatus having a mixer shaft for mixing and transporting the composition.

The composition for concrete repair and reinforcement comprises (1) a main part comprising Portland cement: alumina cement: high strength fine powder mixture: red mud: ore in a weight ratio of 10: 1-8: 10-20: 5-10: 1-10, (2) 5 to 20 parts by weight of an expanding agent, (3) 5 to 10 parts by weight of a fluidizing agent, (4) 1 to 5 parts by weight of an antifoaming agent, and (5) 1 to 10 parts by weight of a cellulose derivative .

The composition for repair and reinforcement of the concrete structure may further comprise 5 to 20 parts by weight of a polyethylene resin and 1 to 15 parts by weight of an organic acid based on 100 parts by weight of the composition for repair and reinforcement.

The mixer shaft includes a rod-shaped shaft portion 100 rotatably installed in a conveying pipe provided at a silo outlet side of the apparatus, and blades 200 and 210 formed in a spiral shape on an outer circumference of the shaft portion 100, The blades 200 and 210 are formed such that the outer diameters of the blades 200 and 210 are different from each other along the axial direction of the shaft portion 100 and are rotatably installed on the shaft portion 100 at a predetermined interval in parallel to the shaft portion 100, RTI ID = 0.0 > 310 < / RTI >

According to another aspect of the present invention, there is provided a method of repairing and reinforcing a concrete structure, comprising the steps of: (a1) pre-treating a section of a concrete; (a2) drilling a reinforcement anchor; (a3) installing a fixture; (a4) providing a high tenacity glass fiber reinforcement or high tenacity carbon stiffener; (a5) removing the reinforcing steel rust; (a6) reinforcing the reinforcing bars; (a7) performing a high pressure water wash; And

(b1) repair and reinforcement including portland cement, alumina cement, high strength fine powder mix, red mud, ore, expanding agent, fluidizing agent, antifoaming agent and cellulose derivative in a pre-wetting injection device equipped with a mixer shaft for mixing and transporting the composition Applying the composition to the concrete section; (b2) spraying the finish material; (b3) curing step; (b4) applying a primer; (b5) applying a finish coating material.

Wherein the repair and reinforcement composition comprises: (1) a main part including Portland cement: alumina cement: high strength fine powder mixture: red mud: ore in a weight ratio of 10: 1-8: 10-20: 5-10: (2) 5 to 20 parts by weight of an expanding agent, (3) 5 to 10 parts by weight of a fluidizing agent, (4) 1 to 5 parts by weight of an antifoaming agent, and (5) 1 to 10 parts by weight of a cellulose derivative have.

The repair and reinforcing composition may further comprise 5 to 20 parts by weight of a polyethylene resin and 1 to 15 parts by weight of an organic acid based on 100 parts by weight of the composition for repair and reinforcement.

The finishing material comprises 10-25 parts by weight of an organosilane, 5-8 parts by weight of a borate compound, 1-5 parts by weight of a polyphosphate, 1-5 parts by weight of phosphoric acid, 1-5 parts by weight of a phenol resin 1-5 And 1 to 3 parts by weight of a metal powder,

The primer is selected from the group consisting of 20-30 parts by weight of methacrylate or acrylate, silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide and tin oxide based on 100 parts by weight of the terminal reactive polysiloxane compound And 5-10 parts by weight of the hardness enhancing particles comprising at least one particle of the hardening enhancing particles.

The mixer shaft includes a rod-shaped shaft portion 100 rotatably installed in a conveying pipe provided at a silo outlet side of the apparatus, and blades 200 and 210 formed in a spiral shape on an outer circumference of the shaft portion 100, The blades 200 and 210 are formed such that the outer diameters of the blades 200 and 210 are different from each other along the axial direction of the shaft portion 100 and are rotatably installed on the shaft portion 100 at a predetermined interval in parallel to the shaft portion 100, RTI ID = 0.0 > 310 < / RTI >

The composition for repair and reinforcement of the present invention is excellent in strength and durability such as compressive strength, bending strength and bond strength, and can be used for various kinds of civil engineering such as roads, bridges, bridge structures, sewer pipes, It can be used for the deterioration of reinforced concrete structure for construction, surface repair by reinforcing steel corrosion and filling. Also, it is applicable to exponential structures such as roof slab waterproofing, swimming pool, water purification plant, etc. because of less shrinkage and excellent water tightness.

In addition, the repair and reinforcement composition of the present invention is excellent in adhesion strength with the concrete matrix, and is not easily separated or dropped off due to strong external pressure or impact.

1 is a schematic view showing a pre-wetting type injection device.
2 is a perspective view schematically showing a mixer shaft.
3 is a view in which a mixer shaft is installed in a pre-wetting jetting apparatus.
Figure 4 is a perspective view schematically illustrating another mixer shaft.

The present invention relates to a composition for repairing and reinforcing a reinforced concrete structure that is excellent in strength and durability and is less shrinkable and can be applied to various roads and exponential structures. In addition, it is preferable to use a pre-wetting injection device having a mixer shaft for mixing and transporting the composition when the composition for repairing and reinforcing concrete structures of the present invention is used.

Hereinafter, the present invention will be described in detail.

The reinforcing concrete reinforcing and reinforcing composition of the present invention comprises (1) a Portland cement: alumina cement: a high strength fine powder mixture: red mud: May be further included.

10 to 10: 1, preferably 10: 1 to 5: 12 to 15: 1, in weight ratio of Portland cement: alumina cement: high strength fine powder mixture: red mud: 8-10: 1-5. When the topical part is mixed in the above-mentioned weight ratio range, the strength and durability of the composition are lowered and the shrinkage occurs more easily, so that it can not be used as a composition for maintenance and reinforcement.

The alumina cement has an Al ₂ O ₃ content of 35 to 60 wt%, an Fe ₂ O ₃ content of 1.0 to 15.0 wt%, and a particle size distribution of 1,000 to 2,000 blaine (cm 2 / g).

The high-strength fine-powder mixed material may be a material containing 90 wt% or more of particles having a residual ratio of 10 wt% or less at a particle size distribution of 44 μm or less, and a material obtained by finely pulverizing blast furnace slag powder as a high- Do.

The red mud is a ceramic-rich by-product alkaline earth metal compound such as alumina (Al ₂ O ₃ ), titanium dioxide (TiO ₂ ) and the like, and is used to supply Na ions necessary for hydration of the high strength fine powder mixture. In addition, red mud can be used with Portland cement, alumina cement and high-strength fine powder mixed material to improve strength and durability but can cause crack due to reduction of whitening phenomenon and shrinkage force. Therefore, red mud can be used in a group of quartz, Mixed with at least one selected ore. When the red mud and the ore are mixed, a dense skeleton structure is formed, so that the strength of the composition is further enhanced, and whitening and cracking are not generated.

Generally, the volume of the cement decreases while reacting with water (i.e., hydration), and thus cracks are generated even when the composition for repair and reinforcement is hardened To prevent this phenomenon, the swelling agent is mixed to reduce the shrinkage or to give the swelling property. For example, when the inflating agent is mixed with cement and water, the inflating agent functions as an admixing material for expanding the cement constituting the composition for repairing and reinforcing. Thus, when the inflating agent expands the cement in the curing process of the repairing and reinforcing composition, And the drying shrinkage of the reinforcing composition is compensated to thereby prevent cracking.

The content of the swelling agent is 5 to 20 parts by weight, preferably 10 to 15 parts by weight based on 100 parts by weight of the main portion. If the content of the expanding agent is less than the lower limit value, cracking may occur. If the content of the expanding agent is higher than the upper limit value, the strength may be lowered.

The fluidizing agent may also be referred to as a reducing agent, and it adopts one of melamine resin and naphthalene series. The fluidizing agent is used for imparting the fluidity and the material separation resistance of the repairing and reinforcing composition and exhibits the cement dispersing action to greatly improve the fluidity and strength of the repairing and reinforcing composition, Since there is no air entraining property, a high-strength repair and reinforcement composition can be obtained.

The content of the fluidizing agent is 5 to 10 parts by weight, preferably 5 to 7 parts by weight, based on 100 parts by weight of the main portion. When the content of the fluidizing agent is less than the lower limit, fluidity and resistance to material separation are low. When the content of the fluidizing agent is higher than the upper limit, the composition may flow down when the composition for repair and reinforcement is placed.

The antifoaming agent functions to remove air bubbles generated in the repair and reinforcement composition. When air bubbles are generated in the repairing and reinforcing composition itself, the air bubbles are removed by using a defoaming agent because the strength and durability are lowered.

The content of the antifoaming agent is 1 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the main portion. If the content of the defoaming agent is less than the lower limit, the bubbles are not removed and the strength and durability may be deteriorated. If the defoaming agent content is higher than the upper limit value, no further effect is produced.

The cellulose derivative improves the viscosity and flocculation action of the repair and reinforcement composition. In the case of using fluidizing agent alone, the use of cellulosic derivatives improves the cohesion between materials because ore and other materials tend to separate even when free-jet injectors are used. In the case of using only the cellulose derivative without the fluidizing agent, it is preferable to use the fluidizing agent and the cellulose derivative together because the portland cement, the alumina cement and the red mud tend to separate even when the pre-wetting injection device is used.

The content of the cellulose derivative is 1 to 10 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of the main portion. When the content of the cellulose derivative is less than the lower limit, the ore and other materials may be separated to deteriorate the strength and durability. If the content exceeds the upper limit, the viscosity may become too high and it may be difficult to pour.

Since the polyethylene resin is composed only of carbon and hydrogen, it reacts with an organic acid to form a network structure. Organic acid attacks and deodorizes hydrogen of polyethylene resin to form a network of polyethylene resins. Then the polyethylene resin mesh has excellent adhesion with existing concrete structure, excellent abrasion resistance and durability after repair.

The content of the polyethylene resin is 5 to 20 parts by weight, preferably 10 to 15 parts by weight based on 100 parts by weight of the composition for repair and reinforcement. If the content of the polyethylene resin is less than the lower limit value, adhesion with the concrete structure, abrasion resistance, and durability may be deteriorated. If the content is above the upper limit, the strength may be lowered.

Organic acids are used for improving the bonding strength between Portland cement, alumina cement, high strength fine powder, red mud and polyethylene resins and ores and for uniform dispersion of the mixture. Specific examples thereof include adipic acid, fumaric acid, , Palmitic acid, lauric acid, (anhydrous) maleic acid, and (anhydrous) terephthalic acid. Of these, one or two or more of them are used.

The content of the organic acid is 1 to 15 parts by weight, preferably 5 to 10 parts by weight. If the content of the organic acid is less than the lower limit, the strength may not be improved. If the content exceeds the upper limit, the strength and durability may be lowered.

Such a repair and reinforcement composition can be applied to a reinforced concrete structure using a pre-wetting injection device equipped with a mixer shaft for mixing and transporting the composition.

1 is a schematic view showing a pre-wetting type injection device. The pre-wetting injection device is a device that pre-wets with a small amount (several%) of water injected from the water tank 51 when the repair and reinforcement composition of the present invention is supplied to the high- The point is characterized. The small amount of water supplied at this time prevents the layer separation phenomenon due to the difference in weight between the mixtures constituting the repairing and reinforcing composition and improves the reactivity to facilitate smooth flow of the composition for maintenance and reinforcement. In this way, primarily the composition for maintenance and reinforcement mixed with water is delivered to the spray nozzle 11 in the state of spray mixed with the compressed air in the high pressure transfer hose through the spray nozzle 11.

Since the pre-wetting injection device as described above has a sufficiently long travel distance to the injection nozzles 10 and 11, it is easy to access the work even if the concrete structure that the vehicle or the vehicle is difficult to access is being repaired. In addition, because the water is mixed with water in the repair and reinforcement composition and flows in the state of a river, the flow smoothly and the attraction force against the construction surface after discharging is high.

Such a pre-wetting jetting apparatus requires a mixer shaft that can mix and deliver the supplied repair and reinforcement composition more effectively.

Fig. 2 is a perspective view schematically showing a mixer shaft, and Fig. 3 is a view in which a mixer shaft is installed in a pre-wetting jetting apparatus.

As shown in Figures 2 and 3, the mixer shaft comprises a shaft portion 100 and a blade 200, and is made of a material that is supplied to the pre-wetting jetting device for maintenance or reinforcement of the concrete structure, The composition is mixed with a small amount of water and simultaneously transported to a high pressure feed pump (not shown).

The shaft portion 100 is rotatably installed in a stirring pipe 80 provided at a discharge side of a silo 70 of the apparatus. The shaft portion 100 is installed at a lower portion of the silo 70 and is coupled to the conveying shaft 74 rotated by the driving portion 72 and is interlocked or rotated by a separate driving portion 76. The shaft portion 100 has a circular or polygonal rod shape in cross section, and preferably has a circular cross section.

The blade 200 is a hollow auger blade, and a hole is formed through the shaft in the axial direction of the shaft portion 100. The hollow type auger type blade 200 is formed in a spiral shape on the outer periphery of the shaft portion 100. The outer diameter of the blade 200 is formed differently along the axial direction of the shaft portion 100, The outer diameter of the blade 200 is formed to be large at the front end portion of the shaft portion 100.

The mixer shaft constructed as described above is rotatably installed in a stirring pipe (80) provided on a discharge side of a silo (70) of a pre-wetting spray device. The repair and reinforcement composition supplied to the apparatus for repairing or reinforcing the concrete structure is mixed with a small amount of water and primary squeeze mixed with a mixer shaft and is transferred to a high pressure transfer pump (not shown). At this time, since the mixer shaft for the injection device has the spiral blade at the outer periphery of the rotating shaft portion, the maintenance and repair composition can be more effectively transferred to the high pressure feed pump. In addition, since the outer diameter of the blades is formed differently along the axial direction of the shaft portion 100 and is formed in a hollow shape, a sufficient internal space is formed so that the repair and reinforcing composition can be mixed and smoothly transported. Although not shown in the figure, the composition for maintenance and reinforcement mixed with a small amount of water and primary syrup mixed by a mixer shaft and conveyed to a high pressure feed pump is supplied to a high pressure feed hose by a high pressure feed pump, And is conveyed toward the injection nozzle in a spraying mixed state by the compressed air in the transfer hose. The reaction takes place and is sprayed on the repair surface of the concrete structure through the spray nozzle. According to the prewetting method, the repair and reinforcement composition supplied to the apparatus for repairing or reinforcing concrete structures is mixed more effectively by the mixer shaft in the state where the primary mixes are mixed, and is further transported to the high-pressure conveying pump, The rebound amount and the dust amount (scattered dust amount) can be reduced when repairing or reinforcing the concrete structure. The amount of rebound means the amount falling on the floor without being adsorbed when the composition is sprayed onto the surface to be applied.

Figure 4 is a perspective view schematically illustrating another mixer shaft.

4, the mixer shaft for another prewetting injector includes a shaft portion 100, a blade 200, and an auxiliary shaft 300. As shown in FIG. Here, the shaft portion 100 and the blade 200 are the same as those of the mixer shaft described above, and a description thereof will be omitted.

The auxiliary shaft 300 is rotatably installed on the shaft portion 100 at a predetermined interval, preferably at a predetermined distance from the shaft portion 100 by a height of a support portion 320 to be described later, and has a helical blade 310 . It is preferable that the auxiliary shaft 300 is installed on both sides of the shaft portion 100 at the rear end portion of the shaft portion 100. [ The auxiliary shaft 300 is rotatably coupled to the support portion 320 fixed to the shaft portion 100 and is not driven by a separate power source (not shown). When the shaft rotates, So that they can be mixed more smoothly.

4, unillustrated reference numeral 210 denotes an auger-type blade in which a hole is not formed unlike the hollow-type auger-type blade 200.

The operation of the mixer shaft of FIG. 4 is the same as that of the mixer shaft of FIG. 2, so that description thereof is omitted. However, since the auxiliary shaft 300 having the helical blade 310 is rotatably installed on the shaft portion 100 at a predetermined interval in parallel to the shaft portion 100, It is possible to more effectively mix and deliver the supplied repair and reinforcement composition.

Also, the present invention provides a method of repairing or reinforcing a reinforced concrete structure using a repair and reinforcement composition.

The method for repairing or reinforcing concrete structures comprises the steps of: (a1) pre-treating a section of concrete; (a2) drilling a reinforcement anchor; (a3) installing a fixture; (a4) providing a high tenacity glass fiber reinforcement or high tenacity carbon stiffener; (a5) removing the reinforcing steel rust; (a6) reinforcing the reinforcing bars; (a7) performing a high pressure water wash; And

(b1) repair and reinforcement including portland cement, alumina cement, high strength fine powder mix, red mud, ore, expanding agent, fluidizing agent, antifoaming agent and cellulose derivative in a pre-wetting injection device equipped with a mixer shaft for mixing and transporting the composition Applying the composition to the concrete section; (b2) spraying the finish material; (b3) curing step; (b4) applying a primer; (b5) applying a finish coating material.

The finishing material comprises 10-25 parts by weight of an organosilane, 5-8 parts by weight of a borate compound, 1-5 parts by weight of a polyphosphate, 1-5 parts by weight of phosphoric acid, 1-5 parts by weight of a phenol resin 1-5 And 1-3 parts by weight of the metal powder.

Also, the primer may be composed of 20-30 parts by weight of methacrylate or acrylate, a group of silica, alumina, zirconia, titanium oxide, zinc oxide, germanium oxide, indium oxide and tin oxide, based on 100 parts by weight of the terminal reactive polysiloxane compound And 5-10 parts by weight of hardness-enhancing particles comprising at least one particle selected from the group consisting of:

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention. Such variations and modifications are intended to be within the scope of the appended claims.

Example  One.

100 parts by weight of a topical part, 10 parts by weight of an expanding agent, 5 parts by weight of a melamine resin as a fluidizing agent, 10 parts by weight of a defoamer And 2 parts by weight of a cellulose derivative were mixed to prepare a composition for repair and reinforcement.

Example  2.

10 parts by weight of a polyethylene resin and 5 parts by weight of an organic acid were added in the same manner as in Example 1 to prepare a composition for repair and reinforcement.

Comparative Example  One.

The same procedure as in Example 1 was conducted except that the composition for repair and reinforcement was prepared without using the red mud.

Comparative Example  2.

The same procedure as in Example 1 was conducted except that the composition for repair and reinforcement was prepared without using the above-mentioned synidine.

Comparative Example  3.

The same procedure as in Example 1 was carried out except that the composition for repair and reinforcement was prepared without using the cellulose derivative.

Comparative Example  4.

The same procedure as in Example 2 was conducted except that the polyethylene resin was not used to prepare a composition for repair and reinforcement.

Test Example  One.

1-1. Compressive strength (kgf / ㎠): tested in accordance with KS L 5105.

1-2. Flexural strength (kgf / ㎠): tested in accordance with KS F 2477.

1-3. Bond strength (kgf / cm 2): tested in accordance with KS F 4715.

1-4. Change in length (%): tested according to KS F 2424.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Compressive strength 3 days 370 375 150 110 100 180 7 days 530 540 260 220 200 310 28th 670 690 390 350 320 450 Flexural strength 3 days 81 83 31 32 20 33 7 days 103 110 63 62 49 69 28th 170 180 101 105 84 111 Bond strength 7 days 21 36 11 12 9 8 28th 37 54 25 27 18 14 Length change rate +0.012 +0.009 +0.049 +0.084 +0.080 +0.064

As shown in Table 1, it was confirmed that the repair and reinforcement compositions prepared according to one embodiment of the present invention were superior in compressive strength, bending strength, adhesion strength, and length change ratio to the repair and reinforcement composition prepared in Comparative Example.

Test Example  2.

The pre-wetting injection device equipped with the mixer and the mixer shaft for simultaneous feeding with the mixer and the repair and reinforcement composition prepared in Examples and Comparative Examples was used to test the thickness at one time.

○: One-time maintenance is possible.

×: Repair and reinforcement is not possible only once

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 50 mm ○ ○ ○ ○ ○ ○ 80 mm ○ ○ ○ ○ × × 100 mm ○ ○ × × × × 120 mm ○ ○ × × × × 150 mm × ○ × × × × 180 mm × × × × × ×

As shown in Table 2 above, the repair and reinforcement compositions prepared according to Examples 1 and 2 of the present invention had a construction of 100 mm or more in comparison with the repair and reinforcement composition prepared in Comparative Example 1, It is possible to solve the instability factor with the interface due to the division by car.

In the case of supplying the repair and reinforcement compositions of Examples 1 and 2 to other conventional spraying apparatuses other than the pre-wetting spraying apparatus, When the composition was supplied and used, it was confirmed that the thickness that can be repaired at once was about 50 mm. Therefore, when the repair and reinforcement composition prepared in the embodiment of the present invention is used together with the pre-wetting spraying device, it is poured 40 mm thicker than in the case of using the conventional spraying device, When the pre-wetting spraying apparatus is used together, the spraying apparatus is thicker than 30 mm in comparison with the conventional spraying apparatus. Therefore, when the repair and reinforcement composition prepared in the embodiment of the present invention is used together with the pre-wetting injection device, it is possible to install the repair and reinforcement composition thicker than when the repair and reinforcement composition of the comparative example and the pre- Therefore, it is preferable to use the repair and reinforcement composition of the present invention for the pre-wetting spraying apparatus.

70: silo 72:
74: shaft 76:
80: stir pipe 100: shaft
200: blade 210: blade
300: auxiliary shaft 310: spiral blade
320: Support

Claims (9)

1. A composition for repairing and reinforcing a reinforced concrete structure supplied to a pre-wetting spray device provided with a mixer shaft for mixing and transporting the composition,
The composition for concrete repair and reinforcement comprises (1) a main part comprising Portland cement: alumina cement: high strength fine powder mixture: red mud: ore in a weight ratio of 10: 1-8: 10-20: 5-10: 1-10, (2) from 5 to 20 parts by weight of an expanding agent, (3) from 5 to 10 parts by weight of a fluidizing agent, (4) from 1 to 5 parts by weight of an antifoaming agent and (5) from 1 to 10 parts by weight of a cellulose derivative Wherein the reinforcing layer is formed of a material having a high thermal conductivity. The reinforced concrete structure according to claim 1, wherein the composition for repair and reinforcement of the concrete structure further comprises 5 to 20 parts by weight of a polyethylene resin and 1 to 15 parts by weight of an organic acid based on 100 parts by weight of the composition for repair and reinforcement. Composition for maintenance and reinforcement. The mixer according to claim 1, wherein the mixer shaft comprises: a rod-shaped shaft portion (100) rotatably installed in a conveying pipe provided at a silo outlet side of the apparatus; a blade (200, 210) formed in a spiral shape on an outer circumference of the shaft portion (100) Wherein the blades (200, 210) have different diameters of the blades (200, 210) along the axial direction of the shaft portion (100). 4. The apparatus of claim 3, wherein the mixer shaft further comprises an auxiliary shaft (300) rotatably mounted on the shaft (100) at a predetermined interval in parallel to the shaft (100) and having a helical blade (310) Wherein the reinforcing concrete structure is formed of a steel sheet. (a1) pre-treating a section of concrete; (a2) drilling a reinforcement anchor; (a3) installing a fixture; (a4) providing a high tenacity glass fiber reinforcement or high tenacity carbon stiffener; (a5) removing the reinforcing steel rust; (a6) reinforcing the reinforcing bars; (a7) performing a high pressure water wash; And
(b1) repair and reinforcement including portland cement, alumina cement, high strength fine powder mix, red mud, ore, expanding agent, fluidizing agent, antifoaming agent and cellulose derivative in a pre-wetting injection device equipped with a mixer shaft for mixing and transporting the composition Applying the composition to the concrete section; (b2) spraying the finish material; (b3) curing step; (b4) applying a primer; (b5) applying a finish coating material to the reinforced concrete structure. 6. The method of claim 5, wherein the repair and reinforcement composition comprises (1) Portland cement: alumina cement: high strength fine powder mixture: red mud: ore in a weight ratio of 10: 1-8: 10-20: 5-10: 1-10 (2) 5 to 20 parts by weight of an expanding agent, (3) 5 to 10 parts by weight of a fluidizing agent, (4) 1 to 5 parts by weight of a defoaming agent, and (5) 10 parts by weight of a reinforcing concrete reinforced concrete structure. The reinforced concrete structure according to claim 6, wherein the repair and reinforcement composition further comprises 5 to 20 parts by weight of a polyethylene resin and 1 to 15 parts by weight of an organic acid based on 100 parts by weight of the composition for repair and reinforcement. . The mixer shaft according to claim 5, wherein the mixer shaft comprises: a rod-shaped shaft portion (100) rotatably installed in a conveying pipe provided on a silo outlet side of the apparatus; a blade (200, 210) formed in a spiral shape on an outer circumference of the shaft portion (100) Wherein the blades (200, 210) have different diameters of the blades (200, 210) along the axial direction of the shaft portion (100). The mixer according to claim 8, wherein the mixer shaft comprises an auxiliary shaft (300) rotatably mounted on the shaft (100) at regular intervals in parallel to the shaft (100) and having a helical blade (310) Rehabilitation of Reinforced Concrete Structures.

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