KR102344366B1 - Section repair material pumping to long-distance and increaing thickness of spray coating and method for emergency repair using threrof - Google Patents

Abstract

The present invention relates to a section repairing material and a repairing method capable of enabling long-distance pumping and spray thickness increase, enabling early practical strength expression, and thus enabling emergency repair of a concrete structure. A section repairing material according to the present invention includes a binder composition including 9.8 to 18.8 wt% of a performance improving agent composed of a fluorinated polyolefin resin, an acrylic resin, magnesium oxide, an expanding agent, a fast curing agent, anhydrite, and slaked lime, and 81.2 to 90.2 wt% of ordinary Portland cement, and filler; and includes 0.1 to 3.0 wt% of an acceleration enhancing agent composed of potassium phosphate and distilled water, and a liquid curing promoting agent including 97.0 to 99.9 wt% of a liquid alkali-free accelerating agent.

Description

SECTION REPAIR MATERIAL PUMPING TO LONG-DISTANCE AND INCREAING THICKNESS OF SPRAY COATING AND METHOD FOR EMERGENCY REPAIR USING THREROF

The present invention relates to a cross-section repair material capable of emergency repair of a concrete structure through long-distance pressurization and an emergency repair method using the same. It relates to a section repair material that can be increased to minimize construction joints, and to enable early expression of practical strength, enabling emergency repair of concrete structures and a repair method using the same.

Concrete structures are widely used as construction materials for semi-permanent structures due to their excellent durability. However, large and small cracks occur in concrete structures due to various causes such as drying shrinkage of concrete, floating settlement, bleeding, or excessive stress. In addition, when a concrete structure is exposed to the marine environment for a long period of time, the concrete erodes by the action of seawater, the reinforcing bars corrode, and the concrete cracks and peels due to volume expansion, resulting in deterioration of the performance of the concrete structure. In winter, concrete breaks down due to freezing and thawing, and when exposed to automobile exhaust gas for a long period of time, the internal rebar corrodes and the concrete cracks or falls off due to the neutralization phenomenon. If the deterioration of these structures continues, there is a risk of eventually leading to the collapse of the structures, so it is necessary to continuously manage and repair them.

In addition, peeling of the structure surface or occurrence of initial defects or cracks facilitates the movement of deterioration factors and accelerates deterioration. It is necessary to suppress and improve durability performance. Therefore, after removing the concrete part that contains deterioration factors such as delamination or drop-off of the cross section of the structure due to deterioration of concrete, corrosion of steel, or other causes, fill or spray with repair reinforcement material to restore the cross section to its original performance and shape. It is common to carry out repairs after construction.

And as the number of domestic social overhead facilities increased, many bridges were built on highways and railroad facilities, and the proportion of bridges was significantly higher than that of other facilities. However, if a vehicle or railroad passes during repair work, vibration is applied to the bridge member, which may lead to cracks and drop-offs in the repair section. Therefore, since many defects of repair mortar occur due to vibration after bridge repair, in order to solve this problem, it is necessary to develop a repair mortar that is strong in vibration after pouring and does not crack or fall off even after a short period of time.

In the conventional cross-sectional repair work, general polymer mortar was used to repair the cross-section of reinforced concrete that was exfoliated, exfoliated, corroded, or expanded due to the deterioration of reinforced concrete. Therefore, the minimum construction thickness of the deteriorated part of the deteriorated concrete structure and the sectional repair and reinforcement member at one time is 30 mm or less, and the economic cost of the sectional repair material is high. There was a problem that it was impossible to repair the front section of a wide range of concrete due to the heavy load. In other words, there were many difficulties when applying the actual concrete structure cross-section repair and reinforcement work because the cost difference between the cross-section repair and reinforcement work of concrete and the new construction cost is not large due to the high cost of application of the existing technology. This was practically impossible.

Looking more specifically, even if the products of the existing method can be transported over long distances by equipment, their physical properties are altered by frictional heat and their quality is affected, leading to defects. In addition, the existing general concrete cross-section repair materials are ultra-lightweight, and when repairing the cross-section of an existing concrete structure, the thickness of one application is 30 mm or less, so hardening time is required for initial construction and chaebol construction. Therefore, when pouring 100mm thick, for example, it requires at least three or more work processes, which requires excessive cost in construction cost. In addition, the existing single-sided repair materials are composed of 50% or more of the total weight of fine aggregate (sand) and close to 50% of cement in the product. Due to the product's own weight during section repair, there is a limit that the thickness of one-time installation, which is less than 30mm, cannot be increased. In addition, if a vehicle passes during the repair work, vibration is applied to the bridge member, and the repair section may lead to cracks and dropouts. Therefore, there was a problem that many defects of repair mortar occurred due to vibration after bridge repair.

On the other hand, the importance of concrete quick-setting is increasing in various construction technologies. Conventionally, an aluminate accelerator has been mainly used. However, aluminate quick-setting admixture has a strong alkali property, so its long-term strength is considerably lowered, and when handling it, it causes problems related to harmfulness to the human body, such as skin burns and etching of eyes and corneas. An alkali-free accelerator has been developed in order to compensate for the problems of the aluminate quick-setter. Alkali-free quick-setting admixtures have less than 1% alkali content and slightly acidic pH, so there is little irritation to the human body, improving the working environment and reducing the risk of environmental pollution. In addition, the alkali-free quick-setting admixture does not forcibly promote the dissolution of calcium silicate phases (C3S, C2S) by discharging strong alkali components from the initial stage of hydration, unlike the conventional aluminate quick-setting admixture. As a result, alkali-free quick-setting adjuvant induces the formation of calcium silicate hydrate (CSH) gel with sufficient long-term age, so there is little decrease in long-term strength, and fine ettringite (C3A·3CaSO ₄ ·32H _{2 )} O) by generating a large amount of aggregate-mortar (paste) interface characteristics are excellent, and has the advantage of better durability than the aluminate quick-setting admixture. However, commercially available alkali-free quick-setting agents have some problems in developing early strength. Therefore, alkali-free quick-setting has a disadvantage in that it is difficult to use in the field of construction technology where the early strength expression of concrete is important, such as tunnel construction, underground construction, or repair construction. Accordingly, there is a demand for the development of a quick-setting admixture excellent in early strength expression that compensates for the above problems.

Republic of Korea Patent Registration No. 10-0582840 (2006.05.17.)

The present invention was devised in consideration of the above problems, and the object of the present invention is to enable long-distance pressure feeding of 100 m horizontally or 40 m or more vertically, so that it is possible to work at a height and increase the spraying thickness, so that the construction joint can be minimized and early practical use. The purpose of this is to provide a section repair material and repair method that enables emergency repair of concrete structures due to the ability to express strength.

According to the characteristics for achieving the above object, the present invention relates to a cross-section repair material capable of emergency repair of a concrete structure through long-distance pressure feeding and a repair method using the same, and relates to a fluorinated polyolefin resin, an acrylic resin, magnesium oxide, and an expanding agent. A mortar composition prepared by mixing 34.7 to 47.2 wt% of a binder composition and 52.8 to 65.3 wt% of a filler at 9.8 to 18.8 wt% of a performance improving agent composed of , fast hardwood, anhydrite and slaked lime and 81.2 to 90.2 wt% of ordinary Portland cement include

The performance improving agent is 0.2 to 5.5% by weight of fluorinated polyolefin resin, 15.7 to 20.3% by weight of acrylic resin, 5.0 to 12.0% by weight of magnesium oxide, 10.8 to 20.4% by weight of expanding agent, 17.5 to 22.2% by weight of fast hardwood, 18.8 to 25.3% by weight of anhydrite %, 9.5 to 14.8% by weight of slaked lime is mixed.

At this time, the performance improving agent is, 1.0 to 2.5% by weight of a fluidizing agent, 0.05 to 0.15% by weight of a thickener, 0.5 to 1.8% by weight of a shrinkage reducing agent, 0.5 to 2.2% by weight of a fiber reinforcement, 0.01 to 0.13% by weight of an air entraining agent, 0.1% by weight of a retarder -5.0 wt% may be further included.

In addition, a liquid curing accelerator is added within the range of 2.4 to 7.2 parts by weight based on 100 parts by weight of the mortar composition to improve the initial fastening power and to express a practical strength of 5.0 MPa or more within 6 hours after spraying, and the liquid curing accelerator is It may be composed of 0.1 to 3.0% by weight of a quick-setting enhancer composed of 1.5 to 12.5% by weight of potassium phosphate and 87.5 to 98.5% by weight of distilled water and 97.0 to 99.9% by weight of a liquid alkali-free quick-setting agent.

The repair method of the present invention for achieving the above object is 9.8 to 18.8 wt% of a performance improving agent composed of fluorinated polyolefin resin, acrylic resin, magnesium oxide, expanding agent, fast hardwood, anhydrite and slaked lime, and 81.2 to 90.2% by weight of ordinary Portland cement. Mixing 34.7 to 47.2% by weight of the binder composition and 52.8 to 65.3% by weight of the filler, and mixing 12 to 16 parts by weight of a compounding water with respect to 100 parts by weight of the mortar composition prepared by mixing the binder composition and the filler; transporting the mortar-mixed water mixture to a spray nozzle gun at an emergency repair point of a bridge or column structure through a mortar hose using a mortar pump; A liquid curing accelerator consisting of 0.1 to 3.0% by weight of a quick-setting enhancer composed of 1.5 to 12.5% by weight of potassium phosphate and 87.5 to 98.5% by weight of distilled water and 97.0 to 99.9% by weight of a liquid alkali-free quick-setting agent is passed through a liquid hose using a pressure pump. pressure-feeding with the injection nozzle gun; compressing the compressed air generated by the air compressor to the injection nozzle gun through an air hose; and mixing the mortar-mixed water mixture, liquid hardening accelerator, and compressed air in the spray nozzle gun and spraying the mixture onto a bridge or column structure.

At this time, the liquid curing accelerator is mixed within the range of 2.4 to 7.2 parts by weight with respect to 100 parts by weight of the mortar composition in which the binder composition and the filler are mixed, and the weight range is controlled by the valve mounted on the spray nozzle gun. desirable.

According to the sectional repair material and repair method that enables emergency repair of a concrete structure through long-distance pressure feeding according to the present invention, fluidity is secured by minimizing the frictional heat between the sectional repair material and the hose in repairing the deteriorated part of the concrete structure, so that 100m horizontally or 40m vertically Long-distance pressurization is possible, and work at height is easy, and it has the advantage of securing stable quality.

And, according to the present invention, there is an effect that can minimize the construction joint by spraying without sagging more than 150mm in thickness at one time by improving the initial fastening force after spraying.

In addition, according to the present invention, there is an advantage that an emergency repair is possible by satisfying the practical strength (compressive strength of 5.0 MPa or more) within 6 hours because early strength is expressed in a short time due to a rapid curing reaction after spraying.

The features and advantages of the present invention will be more clearly understood by the embodiments described by the accompanying drawings.

The application of the present invention is not limited by the configuration and arrangement of components described in the embodiments of the present invention or shown in the drawings. The present invention may be embodied in other embodiments and may be practiced in various ways. Also, the expressions and predicates used in the embodiments with respect to terms such as the orientation of devices or elements are used only to simplify the description of the present invention, and do not indicate or imply that the related devices or elements simply have to have a specific orientation. . For example, although terms such as "first" and "second" are used in the embodiments and claims describing the present invention, such terms are not intended to indicate or imply relative importance or spirit.

In addition, the terms or words used in the present specification and claims are not to be construed as being limited to conventional or dictionary meanings, and the inventors are in the technical spirit of the present invention in order to explain the terms and concepts of the invention in the best way. It should be interpreted as written based on the corresponding meaning and concept.

Therefore, the present invention is not limited to the presented embodiment, and within the technical spirit of the present invention and the technical equivalents described in the claims to be described below by those of ordinary skill in the art to which the present invention pertains. Various modifications and changes are possible.

In the following, preferred embodiments of the present invention will be described in detail.

<Sectional repair material>

The present invention is a cross-section repair material comprising ordinary Portland cement and a performance improving agent, and may further include a liquid hardening accelerator comprising a liquid alkali-free quick-setting agent and a quick-setting agent.

The cross-section repair material according to the present invention contains 12 to 16 parts by weight of the compounding water and 2.4 to 7.2 parts by weight of the liquid curing accelerator based on 100 parts by weight of the mortar prepared by mixing the binder composition and the filler in order to satisfy the required performance as shown in [Table 1]. Use parts by weight. 210±10mm for flow and 20±5℃ for temperature before pumping.

division required performance Long-distance compression possible More than 100m horizontally or 40m vertically Post-transport flow Within ±10mm compared to before transport Fever temperature after transportation Within ±5℃ compared to before transportation One-time construction thickness (plywood formwork) 150mm or more Whether to sag X Compression strength (㎫) 6 hours 5.0 MPa or more

More specifically, the binder composition consists of 9.8 to 18.8% by weight of the performance improving agent and 81.2 to 90.2% by weight of ordinary Portland cement.

Polymer cement mortar including ordinary Portland cement used for cross-section repair of existing concrete structures has very small fluidity of less than 160mm when mixed with mixing water. If the mixing number is increased, the fluidity is increased, but material separation occurs and only the paste is transferred first in transporting the mortar, which causes a quality problem. On the other hand, the mixing water can be fixed and the fluidity can be increased with a high fluidity agent, but the friction between the mortar and the high-pressure hose occurs during long-distance transportation and heat is generated, so the hydration reaction is accelerated and the fluidity is reduced. Therefore, the fluidity is reduced in the same way, which not only affects the quality, but also overloads the equipment such as the mortar pump. Due to the above problems, there are many difficulties in carrying out long-distance transportation and emergency repair of piers and column structures.

Therefore, in the present invention, in order to solve the problems of the prior art, a performance improving agent is added to ordinary Portland cement, and the performance improving agent is 0.2 to 5.5 wt% of a fluorinated polyolefin resin, 15.7 to 20.3 wt% of an acrylic resin, and 5.0 to 12.0 wt% of magnesium oxide. % by weight, 10.8 to 20.4% by weight of an expanding agent, 17.5 to 22.2% by weight of fast hardwood, 18.8 to 25.3% by weight of anhydrite, and 9.5 to 14.8% by weight of slaked lime.

Fluorinated polyolefin resin (PTFE; Polytetrafluoroethylene) used in the present invention is a fluorinated polyolefin resin (polytetrafluoroethylene, polyvinylidene fluoride, tetrafluoroethylene or a copolymer of vinylidene fluoride and tetrafluoro a copolymer of roethylene and hexafluoropropylene). In general, fluorinated polyolefin resins have very low surface energy, so they are sometimes used for lubrication, low friction, or wear resistance. Fluorinated polyolefin resin is a representative fluororesin, which is a polymer material in which hydrogen atoms are substituted with fluorine atoms in the molecular structure of polyethylene. and is known to be non-toxic. In particular, it maintains stability in a wide range of operating temperatures of -250 to 300°C, so its properties do not change. is being used

Due to the addition of 0.2 to 5.5 wt% of the fluorinated polyolefin resin, it is possible to secure fluidity by minimizing the frictional heat between the mortar and the high-pressure hose during long-distance transportation. When the fluorinated polyolefin resin is added in an amount of less than 0.2% by weight, frictional heat is generated and it is difficult to secure fluidity, and when it exceeds 5.5% by weight, the manufacturing cost is greatly increased. Therefore, it is preferably used within the range of 0.2 to 5.5% by weight.

The acrylic resin used in the present invention exhibits excellent adhesion to the base surface of various materials because of its excellent adhesion, and there is no lifting or cracking. In particular, it exerts strong adhesion to the base surface of concrete, mortar, stone, tile, metal, wood, asphalt, synthetic resin-based finishing surfaces, etc. It is a high-tech functional paint type finishing material that can be shortened. In addition, it has excellent abrasion resistance, excellent friction resistance, excellent non-slip function, and excellent impact resistance.

The acrylic resin of the present invention can secure excellent adhesion performance due to the addition of 15.7 to 20.3% by weight, and prevents lifting or cracking after spraying. When the acrylic resin is added in an amount of less than 15.7% by weight, the adhesion performance is reduced to cause lifting or cracking, and when it exceeds 20.0% by weight, the manufacturing cost is significantly increased, so it is preferably used within the range of 15.7 to 20.3% by weight.

Magnesium oxide used in the present invention is magnesium tetrahydrogen calcined at 1300 ℃. If the firing temperature is less than 1300℃, it reacts rapidly when mixed with water, making it difficult to secure the amount of bibim and working time.

Magnesium oxide of the present invention helps to develop early strength after completion of spraying with the liquid curing accelerator due to the addition of 5.0 to 12.0% by weight. When magnesium oxide is added in an amount of less than 5.0% by weight, the practical strength (compressive strength of 5.0 MPa or more) is not satisfied within 6 hours because early strength is not expressed. Since sagging occurs after spraying, it is preferably used within the range of 5.0 to 12.0 wt%.

The expanding agent used in the present invention expands enough to compensate for the shrinkage of the binder, and is used for the purpose of increasing watertightness by reducing drying shrinkage cracks of the mortar.

The expansion agent of the present invention reduces the occurrence of drying shrinkage cracks in the mortar due to the addition of 10.8 to 20.4 wt%. When added in an amount of less than 10.8% by weight of the expanding agent, drying shrinkage cracks occur, and when it exceeds 20.4% by weight, expansion cracks occur, so it is preferably used within the range of 10.8 to 20.4% by weight.

Due to the addition of 17.5 to 22.2% by weight of the fast hardwood of the present invention, it is possible to accelerate the hydration reaction of the mortar to secure early strength. When added at less than 17.5 wt% of fast hardwood, the hydration reaction cannot be accelerated, so practical strength (compressive strength 5.0 MPa or more) cannot be secured within 6 hours. It is preferable to use within the range of 17.5 to 22.2% by weight because premature shrinkage is largely generated after spraying.

The anhydrite of the present invention compensates for premature shrinkage due to the use of fast hardwood due to the addition of 18.8 to 25.3% by weight. Because fast hardwood has a high alumina content and a large amount of shrinkage, early shrinkage can be reduced by adding anhydrite. When anhydrite is added in an amount of less than 18.8% by weight, it is difficult to compensate for shrinkage for the amount of fast hardwood used, and when it exceeds 25.3% by weight, a decrease in compressive strength occurs, so it is preferably used within the range of 18.8 to 25.3% by weight.

The slaked lime of the present invention improves the initial quick-setting power after completion of spraying with the liquid curing accelerator due to the addition of 9.5 to 14.8% by weight. When slaked lime is added in an amount of less than 9.5% by weight, after completion of spraying with the liquid curing accelerator, the initial quick-setting force is weak and sagging occurs, so that one-time construction thickness cannot be secured. It is preferably used within the range of 14.8% by weight.

The blending water of the present invention is 25 to 35 parts by weight based on 100 parts by weight prepared by mixing the binder composition and the filler. If it is less than 25 parts by weight, it is difficult to mix, and if it exceeds 35 parts by weight, the quality is deteriorated due to material separation, so it is preferably used within the range of 25 to 35 parts by weight.

It is preferable that the performance improving agent further adds 1.0 to 2.5% by weight of a glidant. If it is less than 1.0% by weight, it is difficult to cook, and if it exceeds 2.5% by weight, it is a factor of an increase in unit price. Therefore, it is preferably used within the range of 1.0 to 2.5% by weight.

It is preferable to further add 0.05-0.15 weight% of a thickener as a performance improving agent. When it is less than 0.05% by weight, material separation occurs, and when it exceeds 0.15% by weight, the viscosity becomes excessive, so it is preferably used within the range of 0.05 to 0.15% by weight.

The performance improving agent preferably further comprises 0.5 to 1.8 wt% of a shrinkage reducing agent. If it is less than 0.5% by weight, the length change performance is deteriorated, and if it exceeds 1.8% by weight, it is a factor of an increase in unit price, so it is preferably used within the range of 0.5 to 1.8% by weight.

It is preferable that the performance improving agent further comprises 0.5 to 2.2% by weight of the fiber reinforcing material. For fiber reinforcement, use at least one of PVA 3mm, 6mm, and 12mm. If it is less than 0.5% by weight, the flexural strength performance is deteriorated, and if it exceeds 2.2% by weight, it is preferable to use it within the range of 0.5 to 2.2% by weight, because it is difficult to bibim and causes an increase in unit cost.

The performance improving agent preferably further comprises 0.01 to 0.13 wt% of an air entraining agent. If it is less than 0.01% by weight, sagging occurs after spraying due to an increase in unit weight, and 0.13% by weight is preferably used within the range of 0.01 to 0.13% by weight because long-term compressive strength is reduced.

It is preferable that the performance improving agent further comprises 0.1 to 5.0% by weight of a retarder. If it is less than 0.1% by weight, the delay effect is insignificant and the fluidity is rapidly reduced, and if it exceeds 5.0% by weight, the early compressive strength is reduced, so it is preferably used within the range of 0.1 to 5.0% by weight.

The main component of the currently commercialized liquid alkali-free quick-setting admixture is _{aluminum sulphate (Al 2} (SO ₄ ) _{3 ·12-18H 2} O. Because this component has very high solubility in water, a large amount of sulfate is supplied to cement. It promotes the production of etringite from the early stage of hydration, which accelerates the hydration reaction to express quick-setting power and early strength.

More specifically, in the hydration process of general concrete (cement), since ettringite is produced by the dissolution of _{dihydrate gypsum (gypsum, CaSO 4} ·2H _{2 O) mixed with cement, sufficient sulfate is supplied.} do not support However, when a liquid alkali-free quick-setting admixture is used, a large amount of sulfate produced by dissolving aluminum sulfate in the quick-setting admixture is supplied, so that the cement produces a large amount of ettringite. Ettringite produced when liquid alkali-free quick-setting admixture is used is somewhat different from ettringite produced from general concrete. Sulphate supplied by dissolution of dihydrate gypsum in cement has a slow dissolution rate and is localized, whereas sulphate generated from liquid alkali free quick-setting admixture is uniformly distributed in concrete and has a high concentration. Accordingly, the produced etringite is not only in a large amount, but also in fine crystals, forming a very dense structure as a whole. In the case of liquid alkali-free quick-setting admixture, since it does not forcibly enhance the dissolution of the calcium silicate phase by discharging strong alkali components from the initial stage of hydration, it has the advantage of producing sufficient CSH phase at long-term age and reducing long-term strength. However, since it is possible to achieve the intended spraying thickness of 150 mm and a compressive strength of 5.0 MPa or more within 6 hours by using only the liquid alkali-free quick-setting admixture, 0.1 to 97.0 to 99.9% by weight of the quick-setting enhancer 3.0% by weight is mixed and used.

This quick setting enhancer is made by mixing 1.5 to 12.5% by weight of potassium phosphate and 87.5 to 98.5% by weight of distilled water.

Potassium phosphate is preferably used within the range of 1.5 to 12.5% by weight using monobasic potassium phosphate. If it is less than 1.5% by weight, it is difficult to secure initial quick-setting strength and early strength, and if it exceeds 12.5% by weight, it is a factor of an increase in unit price, so it is preferably used within the range of 1.5 to 12.5% by weight.

In addition, the filler used to secure long-term compressive strength and economic feasibility, etc., is used by mixing one or more types from the group consisting of natural sand, artificial silica sand, fly ash, silica fume, and calcium carbonate.

Fly ash, silica fume, and calcium carbonate play a role of filling micropores and forming a matrix by pozzolan reaction, so it is better to use a high powder as much as possible.

Natural sand and artificial silica sand play a role in improving strength, so it is better to use natural sand or artificial silica sand No. 1 to No. 8.

The filler is mixed at 52.8 to 65.3% by weight based on 34.7 to 47.2% by weight of the binder composition, and when it is less than 52.8% by weight, it causes a decrease in long-term compressive strength and an increase in unit price. It is preferable to use within the range of 52.8 to 65.3 wt% because the performance is reduced.

<Repair method>

A repair method for emergency repair of a pier or concrete structure through long-distance pressure feeding using the above-described section repair material will be described as follows.

First, the binder composition and the filler according to the present invention are mixed through a mortar batch mixer to produce a mortar composition, and this is mixed with mixing water. The mixing ratio is as described above, the filler is mixed at 52.8 to 65.3% by weight based on 34.7 to 47.2% by weight of the binder composition, and the blending water is 12 to 16 with respect to 100 parts by weight of the mortar composition prepared by mixing the binder composition and the filler. by weight.

The mixed mortar is pumped over a long distance from the concrete structure to the point where emergency repair is needed through a mortar hose using a mortar pump, approximately 100m horizontally or 40m vertically. The mortar pump used here is preferably either a squeeze pump or a snake pump.

The end face repair material according to the present invention includes a liquid hardening accelerator, and the liquid hardening accelerator is pressurized to the spray nozzle gun through a liquid hose using a pressure pump. Here, the pressure pump must use equipment capable of continuously discharging a certain amount of the liquid curing accelerator composition, and use a pump that is not affected by pulsation.

The above-mentioned mortar-mixed water mixture is pressurized to the spray nozzle gun for spraying the concrete structure, and the liquid hardening accelerator is pressurized through a separate liquid hose, and the mortar-mixed water mixture and the liquid hardening accelerator are mixed and sprayed. In order to do this, an air hose connected to an air compressor to pump compressed air is additionally mounted to the injection nozzle gun. That is, the spray nozzle gun must be equipped with equipment that can separately inject the mortar-mixed water mixture, liquid curing accelerator and compressed air, and must be equipped to mix and spray, and a valve to control the amount of liquid curing accelerator and compressed air It is more preferable to be mounted.

<Examples and Comparative Examples>

Next, Examples according to the present invention and Comparative Examples 1 to 4 in comparison thereto will be described. Specific formulations for Examples and Comparative Examples 1 to 4 are as described in Table 2 below.

division Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4




bookbinder
composition cement Ordinary Portland Cement 330 330 330 330 polymer
cement
mortar
1,000 Performance
improver Fluorinated polyolefin resin 1.5 - 1.5 1.5 acrylic resin 13 13 13 13 magnesium oxide 4.5 4.5 4.5 - swelling agent 9 9 9 9 Sok Kyung-jae 15 15 15 - anhydrite 15 15 15 15 slaked lime 9 9 - 9 glidant 1.2 1.2 1.2 1.2 thickener 0.05 0.05 0.05 0.05 shrinkage agent 0.5 0.5 0.5 0.5 fiber reinforcement 1.0 1.0 1.0 1.0 air entrainment agent 0.05 0.05 0.05 0.05 retardant 0.2 0.2 0.2 0.2 filler Silica fume 120 121.5 129 139.5 artificial silica 480 480 480 480 Sum 1,000 1,000 1,000 1,000 1,000 mixing water 140 140 140 140 160 liquid
Hardening
accelerant quick payment Liquid alkali free 24.3 24.3 25 24.3 - rush
enhancer Potassium phosphate + distilled water 0.7 0.7 - 0.7 -

For Examples, Comparative Examples 1 to 3, and Comparative Example 4 (polymer cement mortar) having the same formulation as in [Table 2], check whether it is possible to pressurize 100m horizontally (or 40m vertically) or more, and fluidity and heat generation temperature after pressurization was measured, and the plywood formwork was separately manufactured to check the thickness to be sprayed once and whether there was any sagging, and the compressive strength was measured by making a specimen in a mold.

First, a mortar prepared by mixing a binder composition and a filler, mixing water, and a liquid hardening pacifier were prepared. First, mortar and mixing water were put in a batch mixer and mixed, and then the mixed mortar was transported horizontally 100m (vertically 40m) by connecting a high-pressure pressure hose to the mortar pump. Second, the liquid curing accelerator was transported horizontally 100m (vertically 40m) by connecting a liquid hose to a separate pressure pump. The pressurized mortar and liquid hardening accelerator were connected to a spray nozzle gun together with compressed air supplied from a separate air compressor at a transportation point of 100 m horizontally (40 m vertically) and sprayed. The results are as shown in [Table 3].

division Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 note Horizontal 100m (vertical 40m) or more
Carriage availability O X O O O use of equipment Flow before pumping 210mm 207mm 206mm 208mm 132mm Table Flow Flow after pumping 207mm X 202mm 206mm 120mm Table Flow Heating temperature before conveying 20.2℃ 20.5℃ 20.3℃ 20.5℃ 20.5℃ surface temperature Exothermic temperature after conveying 20.3℃ 32.0℃ 20.3℃ 20.6℃ 32.4℃ surface temperature Whether it sags during spraying X not measurable O X O Visual evaluation Construction thickness to be sprayed once 155mm not measurable 31mm 152mm 30mm formwork
Separate production compressive strength 6 hours 7.8 MPa not measurable 3.0 MPa not measurable not measurable KS F 4042 Comprehensive evaluation O X X X X

As can be seen from [Table 3], in the embodiment, first, after mixing mortar and mixing water in a batch mixer, when the mixed mortar is connected to a mortar pump by connecting a high-pressure pressure-feeding hose, horizontal 100m (vertical 40m) or more pressure-feeding This was possible, and the flow decreased within 10 mm from 210 mm before transportation to 207 mm after transportation, and the exothermic temperature increased from 20.2°C before transportation to 20.3°C after transportation within 5°C. When spraying mortar on a separately manufactured formwork, no sagging occurred during spraying, and spraying was possible up to 155mm at a time. The compressive strength was 7.8 MPa as a result of measuring the compressive strength for 6 hours by manufacturing a test specimen using a KS F 4042 standard mold, which satisfies the standard value of 5.0 MPa or more. The examples met all criteria.

In Comparative Example 1, since the fluorinated polyolefin resin was not added, friction occurred and heat was accumulated during pressure feeding, making it impossible to transport more than 100 m horizontal (40 m vertical), and the flow was 207 mm before transport. There was no flow value after transport, and heat was generated. The temperature increased from 20.5°C before transportation to 32.0°C after transportation, exceeding 5°C with an increase of 11.5°C. Therefore, it was judged that the physical properties were significantly altered, so the spraying in the next step could not be carried out, and it was not possible to measure the sagging, the thickness of one spraying, and the compressive strength. Comparative Example 1 did not satisfy all standard values.

In Comparative Example 2, when only liquid alkali-free quick setting agent was used without adding slaked lime and quick setting enhancer, it was possible to transport more than 100 m horizontally (40 m vertically), and the flow decreased from 206 mm before transport to 202 mm after transport within 10 mm, and heat generation The temperature increased within 5°C from 20.3°C before transportation to 20.3°C after transportation. However, deflection occurred from 31 mm during the spraying process, and the compressive strength did not fully respond to the standard value of 3.0 MPa for 6 hours.

Comparative Example 3 was able to transport more than 100 m horizontally (40 m vertically) when excluding magnesium oxide and fast hardwood, and the flow decreased from 208 mm before transport to 206 mm after transport within 10 mm, and the exothermic temperature was transported at 20.5° C. before transport. After that, the increase was within 5°C to 20.6°C. When spraying mortar on a separately manufactured formwork, no sagging occurred during spraying, and spraying was possible up to 152mm at a time. However, as for the compressive strength, it was not possible to measure the compressive strength for 6 hours because the hydration reaction did not occur quickly.

Comparative Example 4, which is used in the existing repair method, was able to be transported horizontally 100m (vertical 40m) or more, the flow decreased from 132mm before transport to 120mm after transport, exceeding 10mm, and the exothermic temperature was transported at 20.5℃ before transport. After that, the increase at 32.4°C exceeded 5°C. Deflection occurred from 30mm during the spraying process, and the compressive strength for 6 hours could not be measured.

As described above, according to the present invention, in repairing the deteriorated part of the concrete structure, fluidity is secured by minimizing the frictional heat between the mortar and the hose, so that long-distance pressure feeding of 100m horizontally or 40m or more is possible, and work at high altitude is easy. Stable quality can be secured, and the initial quick-setting power after spraying can be improved to minimize the construction joint by spraying with a thickness of 150mm or more at one time without sagging. It satisfies the practical strength (compressive strength of 5.0 MPa or more) within the range, so that emergency repair is possible.

The rights of the present invention are not limited to the above-described embodiments, but are defined by the claims, and those of ordinary skill in the art can make various modifications and adaptations within the scope of the claims. it is self-evident

Claims (7)

Fluorinated polyolefin resin, acrylic resin, magnesium oxide, expanding agent, fast hardwood, anhydrite and slaked lime, 9.8 to 18.8 wt% of a performance improving agent, and 81.2 to 90.2 wt% of ordinary Portland cement 34.7 to 47.2 wt% of a binder composition and 52.8 wt% It contains a mortar composition prepared by mixing ~65.3% by weight,
The performance improving agent is 0.2 to 5.5 wt% of a fluorinated polyolefin resin, 15.7 to 20.3 wt% of an acrylic resin, 5.0 to 12.0 wt% of magnesium oxide, 10.8 to 20.4 wt% of an expanding agent, 17.5 to 22.2 wt% of a fast hardwood, 18.8 to 25.3 wt% of anhydrite %, is made by mixing 9.5 to 14.8% by weight of slaked lime,
A liquid curing accelerator is added within the range of 2.4 to 7.2 parts by weight based on 100 parts by weight of the mortar composition to improve the initial fastening power and to express a practical strength of 5.0 MPa or more within 6 hours after spraying,
The liquid curing accelerator comprises 0.1 to 3.0% by weight of a quick-setting enhancer composed of 1.5 to 12.5% by weight of potassium phosphate and 87.5 to 98.5% by weight of distilled water and 97.0 to 99.9% by weight of a liquid alkali-free quicksetting agent. A single-sided repair material that enables emergency repair of concrete structures.
delete According to claim 1,
The performance improving agent is, 1.0 to 2.5% by weight of a fluidizing agent, 0.05 to 0.15% by weight of a thickener, 0.5 to 1.8% by weight of a shrinkage reducing agent, 0.5 to 2.2% by weight of a fiber reinforcing agent, 0.01 to 0.13% by weight of an air entraining agent, 0.1 to a retardant Sectional repair material capable of emergency repair of concrete structures through long-distance pressure feeding, characterized in that it further comprises 5.0% by weight.
delete delete Fluorinated polyolefin resin, acrylic resin, magnesium oxide, expanding agent, fast hardwood, anhydrite and slaked lime, 9.8 to 18.8 wt% of a performance improving agent, and 81.2 to 90.2 wt% of ordinary Portland cement 34.7 to 47.2 wt% of a binder composition and 52.8 wt% Mixing ∼65.3% by weight, mixing 12 to 16 parts by weight of a compounding water with respect to 100 parts by weight of a mortar composition prepared by mixing a binder composition and a filler;
pressure-feeding the mortar-mixed water mixture to a spray nozzle gun at an emergency repair point of a bridge or column structure through a mortar hose using a mortar pump;
A liquid curing accelerator consisting of 0.1 to 3.0% by weight of a quick-setting enhancer consisting of 1.5 to 12.5% by weight of potassium phosphate and 87.5 to 98.5% by weight of distilled water and 97.0 to 99.9% by weight of a liquid alkali-free quick-setting agent is passed through a liquid hose using a pressure pump. pressure-feeding with the injection nozzle gun;
compressing the compressed air generated by the air compressor to the injection nozzle gun through an air hose; and
In the spray nozzle gun, mixing the mortar-mixed water mixture, liquid hardening accelerator, and compressed air, and spraying the mixture onto a bridge or column structure.
7. The method of claim 6,
The liquid curing accelerator is mixed within the range of 2.4 to 7.2 parts by weight based on 100 parts by weight of the mortar composition in which the binder composition and the filler are mixed, characterized in that it is adjusted to the above weight range by a valve mounted on the spray nozzle gun. A repair method using sectional repair materials for emergency repair of concrete structures.