KR102153623B1 - Repair mortar composition with improved vibration resistance & Repair method of concrete structure using the same - Google Patents

Abstract

The present invention relates to a repair mortar composition with increased vibration resistance to be applied to a repair construction of a deteriorated concrete structure, and a concrete structure repairing method using the same. According to the present invention, the repair mortar composition with increased vibration resistance comprises: 30-40 wt% of cement; 2-5 wt% of an expansible material; 3-6 wt% of a performance improvement additive; 2-10 wt% of fine silica-alloy powder; 0.1-1.0 wt% of fiber; and 35-60 wt% of sand. Moreover, the concrete structure repairing method comprises the following steps: (a) coating a primer on a surface to be repaired; (b) mixing the repair mortar composition and water to fill defective parts and finish the primer coating surface using the mixture; and (c) coating a surface protection material on the finished surface of the repair mortar.

Description

Repair mortar composition with improved vibration resistance & Repair method of concrete structure using the same}

The present invention relates to a repair mortar composition with improved vibration resistance that can be applied to the repair work of deteriorated concrete structures, and a concrete structure repair method using the same.

Concrete structures deteriorate due to physicochemical phenomena such as neutralization and carbonation, cracking due to vibration and impact. When deterioration occurs, the passive film of the reinforcing bar inside the concrete is destroyed, causing corrosion, and if left unattended, the structure may be damaged or collapsed. Accordingly, if deterioration progresses on the surface of a concrete structure, the life of the structure is prolonged through section restoration work after removing the deteriorated part.

Repair mortar is a building and civil engineering material used to restore the section of a deteriorated concrete structure.The surface finish and neutralization resistance of deteriorated areas such as the walls and floors of buildings, underground structures and common ducts, water supply facilities, and inside tunnels operated by vehicles and railways, It is used for durability recovery. In order to be used for this purpose, properties such as adhesion, durability, reduction of shrinkage and expansion, and low water permeability are required.

On the other hand, in the case of a structure where vibration occurs due to vehicle and train operation, operation of machine facilities, etc., when a repair mortar is constructed in a state where vibration resistance is not secured, the repair mortar may crack or fall off due to vibration.

Therefore, the repair mortar needs to secure vibration resistance in addition to the characteristics that should be fundamentally provided to prevent dropping of the repair surface immediately after construction and to prevent cracking and dropping after hardening of the repair mortar.

In addition, the daily work amount may be limited according to the work time limit when the vehicle or train is running inside the tunnel and during the repair work of the structure. This is a problem that occurs because the repair material construction is performed by manpower.

Therefore, there is a need for a mechanized repair work facility capable of minimizing manpower work and improving work efficiency when constructing repair materials.

1. Registration Patent 10-1559572 "Section repair method of reinforced concrete structures using functional mortar composition for cross section repair of reinforced concrete structures" 2. Registered Patent 10-1655108 "Seismic Reinforcement Method Using Seismic Mortar" 3. Registered Patent 10-0515948 "A mortar composition for cross-section restoration containing nitrite hydrotalcite or hydrocalumite, and a rebar corrosion inhibition repair method for reinforced concrete structures using the same" 4. Registered Patent 10-1682612 "Concrete cross section repair mortar with excellent durability" 5. Registered Patent 10-1899568 "Concrete structure recovery repair material"

The present invention provides a repair mortar composition that can reduce the amount of rebound that may occur during the construction of a section where vibration is generated by improving the vibration resistance of the repair mortar used in concrete section restoration construction, and minimize cracks and dropping phenomena that may occur after construction. It has its purpose in providing.

Specifically, an object of the present invention is to provide a repair mortar having improved resistance to vibration and impact by applying a silicon alloy while satisfying the characteristics of the existing repair mortar, such as compressive strength, adhesive strength, and length change rate.

In addition, another object of the present invention is to provide a construction method and method with improved work efficiency by using a mechanized repair facility when performing a section restoration work.

The present invention "cement 30-40wt%; 2 to 5 wt% of the expanding material; 3~6wt% of performance improvement additives; 2 to 10 wt% of fine silicon alloy powder; 0.1-1.0 wt% of fiber; And 35-60 wt% sand; It provides a maintenance mortar composition with improved vibration resistance".

The expanding material, calcium sulfoaluminate 50 ~ 70wt%; And 30 to 50 wt% of a gypsum-based material of any one or more of anhydrous gypsum, dihydrate gypsum and slaked lime; It is possible to apply the composition including, and satisfy the conditions of 7wt% or more of the total amount of the Al ₂ O ₃ component, 24wt% or more of the total amount of SO ₃ components, and the powderiness of 2,500 ㎠/g or more.

The performance-improving additive is 80 to 90 wt% of a re-emulsified powder resin made of vinyl acetate/ethylene copolymer; 5 to 10 wt% of a water repellent composed of at least one of silicon-based or metal salt-based powders; And 0.5-1 wt% of a thickener; It is possible to apply the composition including.

The silicon alloy fine powder has a particle diameter of 0.075 mm or less, and a Si content of 40 to 75 wt% is applied, and one containing at least one component of Fe or Fe-Al may be applied.

In addition, the present invention "(a) applying a primer to the surface to be repaired; (b) mixing the above-described repair mortar composition with water, filling and plastering the defects on the primer-coated surface; And (c) a concrete structure repair method comprising the step of applying a surface protection material to the repair mortar plastering surface.

(Pre a) step of installing a repair work facility around the surface to be repaired before performing the step (a); In this case, steps (a) to (c) are performed by the maintenance work equipment, wherein the maintenance work equipment includes: upper and lower horizontal rails installed on the upper and lower portions of the surface to be repaired; A vertical rail installed to move horizontally between the upper and lower horizontal rails; And a head portion capable of vertically movable along the vertical rail, and provided with a liquid spray nozzle (primer and surface protection material spray) and a repair mortar spray nozzle respectively connected to a raw material supply pipe at a central portion, and a plaster plate coupled to both sides thereof; It can be configured to include.

The effects according to the present invention described above are as follows.

The repair mortar applied with silicon alloy can absorb and offset the vibration and shock as the metal atoms present in the silicon alloy move when external influences such as vibration and impact occur, thereby maintaining the bonding form of cement hydrates and minimizing cracking and falling off. I can make it.

In addition, the silicon component present in the silicon alloy has the characteristics of a reducing agent, so it can suppress the corrosion of the reinforcing bar existing in the concrete, and the silicon alloy present as fine particles of 0.075mm or less is filled by filling the voids inside the repair mortar. It is effective in improving compressive strength and durability due to its effect.

In addition, the maintenance work facility according to the present invention can minimize the influence on vehicle control and work time limitation during the construction of the inside of the tunnel and the side wall of the structure in which the vehicle or train is running, and the construction of repair materials such as repair mortar and plastic, and surface protection materials As this is possible, it is effective in improving construction efficiency and quality.

[Fig. 1] schematically shows a mechanism for improving vibration resistance of the repair mortar composition of the present invention.
[Fig. 2] is a photograph taken of a vibration resistance comparison test result of applying the repair mortar composition of the present invention and the existing repair mortar product.
[Fig. 3] is a graph showing the results of a water penetration resistance test by applying the repair mortar composition of the present invention and the existing repair mortar product.
[Fig. 4] shows the detailed process of the pretreatment step, and the materials and construction equipment used.
[Fig. 5] shows an embodiment of a maintenance facility applied to the present invention.
[Fig. 6] shows the head of the maintenance work equipment of the present invention.
[Fig. 7a] shows a specific embodiment of the upper and lower horizontal rails among the maintenance work equipment.
[Fig. 7b] shows a specific embodiment of the vertical rail and the head of the maintenance work equipment.
[Fig. 8] shows a process of performing step (a) (primer application step) of the cross-sectional repair method of a concrete structure provided by the present invention using a repair work facility.
[Fig. 9] shows a process of performing (b) step (repair mortar coating and plastering step) of the cross-sectional repair method of a concrete structure provided by the present invention using a repair work facility.

Ι. Repair mortar composition with improved vibration resistance

As the repair mortar is used to restore the cross section of deteriorated concrete, its development was focused on adhesion, blocking external deterioration factors (water repellency, acid resistance, salt resistance), light weight, fast hardening, and durability. However, there is a concern that cracking and falling off of the repair mortar construction part may occur during the repair work of a place where vibration and shock occur.

In order to solve the above-described problem, the present invention is "cement 30 ~ 40wt%; 2 to 5 wt% of the expanding material; 3~6wt% of performance improvement additives; 2 to 10 wt% of fine silicon alloy powder; 0.1-1.0 wt% of fiber; And 35-60 wt% sand; It provides a maintenance mortar composition with improved vibration resistance".

As the cement, any one or more of class 1 ordinary Portland cement, class 3 coarse steel cement, and mixed cement may be applied. As the sand, any one or more of silica sand, dolomite, and limestone having a particle diameter of 0.1 to 2.0 mm may be applied.

The expandable material prevents shrinkage of the repair mortar and prevents shrinkage cracking that may occur after curing. The expanding material is calcium sulfoaluminate 50 to 70wt%; And 30 to 50 wt% of a gypsum-based material consisting of at least one of anhydrous gypsum, dihydrate and slaked lime; It can be created with Accordingly, the calcium sulfoaluminate and the gypsum-based material may be mixed in a ratio of 1:1 to 2.5:1, and the total amount of the Al ₂ O ₃ component in the mixed expansion material is 7 wt% or more in consideration of the aspect of curing shrinkage compensation. , SO ₃ It is preferable that the conditions of a total amount of 24wt% or more are satisfied, and the powderiness is 2,500cm2/g or more.

The performance-improving additive is added in 3 to 6% by weight of the repair mortar composition to improve vibration resistance and durability of the repair mortar, and specifically, a re-emulsified powder resin made of vinyl acetate/ethylene copolymer; A water repellent composed of at least one of silicon-based or metal salt-based powders; And thickeners; It can be composed, including.

The re-emulsified powder resin improves the adhesion performance, thereby reducing the amount of rebound during spraying of the repair mortar, and improving the adhesive strength of the repair mortar, thereby preventing the repair mortar from falling off due to vibration and impact. When the re-emulsified powder resin is applied less than 80 wt% of the performance improvement additive, the above-described adhesion performance is not sufficiently exhibited, and when applied exceeding 90 wt%, the strength development of the repair mortar cured body is negatively affected. Therefore, it is preferable to apply the re-emulsified powder resin in the range of 80 to 90 wt% of the performance improvement additive.

The water repellent blocks moisture penetrating into the repair mortar to reduce whitening, prevents corrosion of reinforcing bars, and improves freeze-thaw resistance, thereby contributing to maintaining the durability of the repair mortar hardened body. When the water repellent is applied less than 5wt% of the performance improvement additive, the above-described moisture penetration prevention effect is not sufficiently exhibited, and when it is applied exceeding 10wt%, the cement hydration is negatively affected. Therefore, it is preferable to apply the water repellent in the range of 5 to 10 wt% of the performance improvement additive.

The thickener may be applied in the range of 0.5 to 1 wt% of the performance improvement additive to improve workability of the repair mortar and reduce sagging after spraying.

In the present invention, the silicon alloy fine powder is applied in 2 to 10 wt% of the total weight of the repair mortar in order to improve the vibration resistance of the repair mortar. The silicon alloy fine powder has a particle diameter of 0.075 mm or less, a Si content of 40 to 75 wt%, and may be composed of one or more components of Fe or Fe-Al. When vibration occurs due to the operation of vehicles, trains, machines, etc. As shown in [Fig. 1], the metal atoms of the silicon alloy present in the repair mortar move (maintain the form of free electromagnetic coupling) to offset vibration and shock. Will be ordered. Accordingly, it is possible to maintain the cement hydrate bonded form by improving the vibration and impact resistance of the repair mortar.

In addition, since the silicon component present in the silicon alloy has a reducing agent property, corrosion of reinforcing bars present in concrete can be suppressed. Accordingly, in the long term, cracks due to rebar expansion are prevented, and chloride penetration through cracks is also reduced. In addition, the silicon alloy, which is present as fine particles having a particle diameter of 0.075 mm or less, contributes to improvement of compressive strength and durability due to the void filling effect inside the repair mortar hardened body.

When the silicon alloy fine powder is applied in less than 2 wt% of the total composition, it is difficult to clearly obtain the above-described vibration resistance improvement effect, and when applied in excess of 10 wt%, the vibration resistance and durability of the hardened repair mortar cannot be improved any more, and the cost increases. Since it is only a cause of, it is preferable to apply it in the range of 2 to 10 wt% of the repair mortar composition.

The fiber is for imparting toughness to the repair mortar cured body, and suppresses cracking and falling off of the repair portion. In the present invention, any one or more of nylon and cellulose can be applied, and in consideration of mixing, mixing and spraying workability of raw materials, it is recommended to apply a fiber with a length of 2 to 8 mm in the range of 0.1 to 1.0 wt% of the total repair mortar. desirable.

Hereinafter, the effects of the invention will be described in detail through embodiments of the invention. However, the present invention is not limited to the following examples.

division Composition material (wt%) cement sand Expanding material Silicon alloy fiber additive Comparative Example 1 37.0 57.0 2.0 - - 4.0 Comparative Example 2 34.0 57.0 5.0 - - 4.0 Comparative Example 3 34.0 55.0 5.0 1.0 - 5.0 Comparative Example 4 34.0 54.9 5.0 1.0 0.1 5.0 Example 1 34.0 53.9 5.0 2.0 0.1 5.0 Example 2 34.0 50.9 5.0 5.0 0.1 5.0 Example 3 34.0 45.9 5.0 10.0 0.1 5.0 Comparative Example 5 34.0 43.9 5.0 12.0 0.1 5.0 Comparative Example 6 34.0 50.5 5.0 5.0 0.5 5.0 Example 4 34.0 50.0 5.0 5.0 1.0 5.0 Comparative Example 7 34.0 49.8 5.0 5.0 1.2 5.0

The composition ratios for the Examples and Comparative Examples in [Table 1] are presented for 100wt% of the total weight of the mortar. Class 1 ordinary Portland cement was applied as cement, and 0.1~2mm silica sand was applied as sand. As for the expanding material, calcium sulfoaluminate and gypsum-based materials (mixed with anhydrous gypsum, dihydrate and slaked lime) were mixed in a ratio of 2:1, and nylon fibers of 6 mm length were applied. As the performance improvement additive, a mixture of re-emulsifying powder resin, water repellent, and thickener was applied. In addition, the performance of the silicon alloy was confirmed at the ratio as shown in [Table 1] in the range of 1 to 12%.

[Table 2] below summarizes the results of testing according to the KS F 4042 polymer cement mortar test method for repairing concrete structures for the Examples and Comparative Examples shown in [Table 1].

division Flo
(mm) Flexural strength (MPa) Compressive strength (MPa) Adhesion strength
(MPa) Water permeability
(g) Length
Rate of change
(%) 1 day 7 days 28 days 1 day 7 days 28 days Comparative Example 1 215 2.6 5.6 7.4 9.7 36.8 52.2 0.91 2.8 -0.120 Comparative Example 2 205 2.5 5.8 6.9 10.5 28.7 48.3 0.96 2.5 -0.094 Comparative Example 3 200 2.4 6.1 7.4 12.6 30.4 49.5 1.42 2.3 -0.092 Comparative Example 4 200 3.1 6.5 8.7 13.4 31.6 51.4 1.53 2.1 -0.089 Example 1 195 4.2 7.2 9.2 15.9 35.9 53.7 1.49 1.9 -0.087 Example 2 190 4.5 7.2 10.6 18.6 39.1 58.4 1.5 1.7 -0.090 Example 3 185 4.9 7.4 11.6 19.4 40.2 60.6 1.47 1.5 -0.087 Comparative Example 5 180 4.9 8.6 11.2 19.3 39.6 61.2 1.42 1.6 -0.091 Comparative Example 6 175 4.5 9.0 11.7 18.6 39.1 62.4 1.61 1.5 -0.089 Example 4 170 5.2 11.3 11.7 18.9 40.8 64.2 1.59 1.6 -0.087 Comparative Example 7 150 6.5 11 12.2 19.2 41.7 66.5 1.84 1.8 -0.084

As can be seen in [Table 2] above, in all Examples and Comparative Examples, the bending strength and compressive strength as of 28 days of age were found to satisfy the KS standard (bending strength of 6.0 MPa or more, compressive strength of 20.0 MPa or more).

As a result of analysis of Comparative Examples 4 to 5 and Examples 1 to 3 in which the silicon alloy was applied, it was confirmed that the compressive strength tended to increase as the amount of silicon alloy used increased, and the water permeability was also slightly decreased. However, as shown in Comparative Example 5, when the amount of the silicon alloy used exceeds 10%, it can be seen that the strength enhancing effect is not large.

In addition, in Comparative Examples 1 to 2, it was found that the rate of change in length decreased when the use of the expanding material increased from 2 wt% to 5 wt%. It is believed that as the amount of expansion material increased, calcium sulfoaluminate reacted with gypsum to increase the amount of ethrinzite with expansion performance, thereby reducing shrinkage. In addition, as the amount of additives used for performance improvement increased (Comparative Examples 2 to 3), the adhesion strength increased. It is judged that as the amount of re-emulsified powder resin contained in the additive increases, the bonding strength with the parent body is strengthened and the adhesion strength is increased.

In addition, as shown in Comparative Examples 6 to 7 and Example 4, it was confirmed that the flexural strength increased as the amount of fiber used increased. However, when the amount of fiber exceeded 1.0%, the flow was rapidly reduced. When the flow is reduced, not only the repair mortar plastering workability is deteriorated, but also the problem of not being discharged from the inside of the quality equipment during spraying may occur.

The physical property comparison test results of the repair mortar composition (hereinafter referred to as “the present invention”) and the existing repair mortar composition (hereinafter referred to as “conventional technology”) specified in Example 4 are shown below. The vibration resistance test was performed on a Lab-scale, and the adhesion, adhesion, compressive strength, and moisture penetration resistance were tested on a field-scale.

[Test Example 1]-Vibration resistance

The existing technology and the present invention were plastered on a concrete matrix to the same thickness (10 cm), and a vibration resistance test was performed on a specimen cured for 1 hour (see [Fig. 2]).

Each specimen was subjected to a three-stage test in which the magnitude of vibration was different, and it was checked whether the repair mortar hardened body was changed or dropped out according to the vibration.

[Table 3] below shows the vibration resistance test conditions and test results.

division Exam conditions Test result acceleration
(g) Vibration amount
(dB) Excitation force form Vibration time Level 1 0.05 91 Sine vibration 3 minutes nothing strange Step 2 2.00 123 Sine + shock vibration 5 minutes nothing strange Step 3 3.12 127 Sine + shock vibration 5 minutes -Invention: No abnormality
-Existing technology: Eliminated (3 minutes)

As shown in [Table 3] above, in the case of the present invention, it was confirmed that the present invention has resistance to vibration and shock because deformation and dropping do not occur even with 127 dB vibration.

[Test Example 2]-Adhesion and adhesion

As shown in [Table 4] below, the rebound rate when spraying the repair mortar inside the tunnel was reduced by 0.3% to 1.1% for the existing technology and 0.8% for the present invention, and 0.7% for the existing technology and the present invention during conquest. It was also reduced by 0.3% to 0.4%.

Comparing the above rebound rate relative to each other, it is about 27% reduction at the time of initial punishment and about 43% at the time of conquest.

division Rebound (%) Compressive strength
(28 days old) Priming Conquest The present invention 0.8 0.4 48.9 Existing technology 1.1 0.7 30.0

As shown in [Table 5] below, the adhesion strength expressed at 28 days of age was 1.93 MPa for the existing technology and 2.30 MPa for the present invention, and when forming the repair mortar layer according to the present invention after the primer layer was formed, the adhesion strength was 3.15 MPa. .

division The present invention
(Repair mortar + primer) The present invention
(Repair mortar) Existing technology
(Repair mortar) Adhesive strength
(MPa) 3.15 2.30 1.93

[Test Example 3]-Compressive strength

The compressive strength of 28 days of age was improved by 63% with the conventional technology of about 30 MPa and the present invention of 48.9 MPa (see [Table 4]).

[Test Example 4]-Moisture penetration resistance

As a result of the water absorption test result of the existing technology and the cured water-retaining mortar of the present invention, as shown in [Fig. 3], the conventional technology absorbs 0.71 ml, and the present invention absorbs 0.2 ml. It was reduced by 72%.

By reducing the amount of water absorption, electrolyte penetration is reduced to prevent corrosion of reinforcing bars, and resistance to freezing and thawing is improved, thereby maintaining durability.

Ⅱ. Concrete structure repair method

The present invention "(a) applying a primer to the surface to be repaired; (b) mixing the repair mortar composition of any one of claims 1 to 6 with water, filling the defects on the primer-coated surface, and plastering; And (c) a concrete structure repair method comprising the step of applying a surface protection material to the repair mortar plastering surface.

Step (a) is a step of applying a primer to the surface to be repaired where concrete defects have occurred, the process of removing the entire deteriorated section of concrete, the process of installing water leakage (order) and drainage, and the process of cleaning the surface of the work object And a pretreatment step such as rust removal/rust prevention treatment/alkali recovery treatment process of the exposed reinforcing bar.

The construction sequence, materials used, construction equipment, etc. of the pretreatment step are as shown in [Fig. 4].

The primer applied to the surface to be repaired in this step is to enhance the adhesion strength of the repair mortar, and according to the application of the primer, the adhesion strength of the repair mortar is improved by 37% compared to the case where the fry is not applied (2.30 MPa → 3.15 MPa). The primer can be applied by spraying by spray equipment.

The step (b) is a step of filling and plastering a fresh mortar in which water is mixed with the above-described repair mortar composition in the defect portion on the primer application surface. The repair mortar composition may be applied in a spraying manner using shotcrete equipment.

The step (c) is a step of applying a surface protection material to the repair mortar plastering surface. The surface protection material can be applied when curing the repair mortar construction part. With the application of the surface protective material, the neutralization resistance is 10 mm or less.

The surface protection material may also be applied by spraying by spray equipment.

On the other hand, before the step (a) is carried out, it may further include a step (Pre a) of installing a repair work facility around the surface to be repaired. Specifically, the (Pre a) step is performed between the above-described pretreatment step and (a), and accordingly, the (a) to (c) steps are performed by the maintenance work facility installed in the (Pre a) step. It can be done.

The maintenance work equipment installed in the (Pre a) step includes upper and lower horizontal rails 10a and 10b installed on the upper and lower surfaces of the maintenance target surface 1 as shown in [Fig. 5] and [Fig. 6]; A vertical rail 20 installed to move horizontally between the upper and lower horizontal rails 10a and 10b; And vertically movable along the vertical rail 20, and a liquid spray nozzle 31 and a repair mortar spray nozzle 32 connected to the raw material supply pipes 40a and 40b, respectively, are provided in the central part, and a plaster plate ( 33) the combined head portion 30; It can be configured to include. The head unit 30 may have a liquid injection nozzle 31 and a repair mortar injection nozzle 32 arranged vertically in a central portion. (B) and (d) of [Fig. 6] show a cutaway state to show the arrangement of the liquid injection nozzle 31 and the repair mortar injection nozzle 32. Since the liquid spray nozzle 31 can spray the primer and the surface protection material, it can be used for the primer coating operation of step (a) and the surface protection material coating operation of step (c).

[Fig. 7a] shows a specific embodiment of the upper and lower horizontal rails 10a and 10b, wherein the upper and lower horizontal rails 10a and 10b are respectively attached to the upper and lower end plates 11a and 11b. The side plates 12 are combined in a spaced state to form an interior space 13, and a transverse line groove 14 is formed on the plate surface of the side plate 12.

The upper and lower moving wheels 21a and 21b of the vertical rail 20, which will be described later, are inserted into the interior space 13, and the upper and lower moving wheels 21a and 21b are each of the upper and lower end plates 11a, Roll and move in the grounded state to 11b).

The rotation shaft 24 of the upper and lower moving wheels 21a and 21b is fitted in the transverse line groove 14.

[Fig. 7b] shows a specific embodiment of the vertical rail 20 and the head unit 30. Wheel frames 22 are respectively provided at the upper and lower portions of the vertical rail 20, and the upper and lower moving wheels 21a and 21b are mounted on the wheel frame 22 through the rotation shaft 24 , As described above, it is configured to be rolled along the upper and lower horizontal rails 10a and 10b to move in the transverse direction.

In addition, a longitudinal line groove 23 is formed in the vertical rail 20, and the head part 30 has a connection protrusion 34 fitted into the longitudinal line groove 23, and the longitudinal line It is configured to move up and down along the groove 23.

[Fig. 8] shows the process of performing the step (a) using the above-described maintenance work equipment. In a state in which the primer is sprayed from the liquid jet nozzle 31, the vertical rail 20 By horizontally moving between the upper and lower horizontal rails (10a, 10b), the coating operation in the transverse direction proceeds, and the head part 30 moves vertically along the vertical rails 20 to vertically move the surface to be applied. Can be moved to.

[Figure 9] using the above-described maintenance work equipment. As showing the process of performing the step (b), in a state in which the repair mortar is sprayed from the repair mortar spray nozzle 32, the vertical rail 20 is between the upper and lower horizontal rails 10a and 10b. By horizontal movement, the coating operation in the transverse direction proceeds, and the head part 30 moves vertically along the vertical rail 20 to move the surface to be applied in the longitudinal direction. In this step, as the vertical rail 20 moves horizontally, the plastering plate 33 of the head part 30 moves horizontally together, so that the plastering work on the surface to which the repair mortar is applied can be performed, and the plastering plate ( Since 33) is provided on both sides of the head part 30, the repair mortar plastering work is performed regardless of the moving direction of the vertical rail 20.

In the above, the present invention has been described in detail together with specific examples. However, the present invention is not limited by the above embodiments, and may be modified or modified without departing from the gist of the present invention. Accordingly, the claims of the present invention include such modifications or variations.

1: surface to be repaired 2: primer
3: Repair mortar
10a, 10b: upper and lower horizontal rails
11a, 11b: upper and lower end plate 12: side plate
13: interior space 14: transverse line groove
20: vertical rail
21a, 21b: upper and lower moving wheel 22: wheel frame
23: longitudinal line groove 24: rotating shaft
30: head
31: liquid injection nozzle 32: repair mortar injection nozzle
33: plastering plate 34: connecting projection
40a, 40b: raw material supply pipe

Claims (8)

30-40 wt% cement; 2 to 5 wt% of the expanding material; 3~6wt% of performance improvement additives; 2 to 10 wt% of fine silicon alloy powder; 0.1-1.0 wt% of fiber; And 35-60 wt% sand; Including,
The performance-improving additive is 80 to 90 wt% of a re-emulsified powder resin made of vinyl acetate/ethylene copolymer; 5 to 10 wt% of a water repellent composed of at least one of silicon-based or metal salt-based powders; And 0.5-1 wt% of a thickener; It is formed including,
The silicon alloy fine powder has a particle diameter of 0.075 mm or less, a Si content of 40 to 75 wt%, and contains any one or more components of Fe or Fe-Al,
Plastering a concrete matrix to a thickness of 10 cm, curing for 1 hour, and applying sine vibration and shock vibration for 5 minutes under conditions of vibration acceleration of 3.12 g and vibration amount of 127 dB, but no abnormality occurs in the plastering state.
Repair mortar composition with improved vibration resistance.
In claim 1, wherein the inflatable material,
50-70 wt% of calcium sulfoaluminate; And
30-50 wt% of a gypsum-based material at least one of anhydrite, dihydrate and slaked lime; Repair mortar composition with improved vibration resistance, characterized in that the composition comprising a.
In claim 2, wherein the inflatable material,
The expansion material satisfies the conditions of 7wt% or more of the total amount of Al ₂ O ₃ components, 24wt% or more of the total amount of SO ₃ components, and the degree of powdery is 2,500 ㎠/g or more.
delete delete delete (a) applying a primer to the surface to be repaired;
(b) mixing the repair mortar composition of any one of claims 1 to 3 with water, filling the defects on the primer-coated surface, and plastering; And
(c) A concrete structure repair method comprising the step of applying a surface protection material to the repair mortar plastering surface.
In clause 7,
(Pre a) step of installing a repair work facility around the surface to be repaired before performing the step (a); Including more,
The (a) to (c) steps are carried out by the maintenance work facility,
The maintenance work equipment,
Upper and lower horizontal rails installed on the upper and lower parts of the surface to be repaired;
A vertical rail installed to move horizontally between the upper and lower horizontal rails; And
A head portion capable of vertical movement along the vertical rail, a liquid spray nozzle and a repair mortar spray nozzle respectively connected to a raw material supply pipe at a central portion, and a plaster plate coupled to both sides thereof; Concrete structure repair method, characterized in that configured to include.

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