KR100787646B1 - Mortar composition for reinforcement of underwater concrete structure and method for reinforcement of concrete structure using thereof - Google Patents

Abstract

A mortar composition for repairing and reinforcing marine concrete structures is provided to allow the structures to maintain excellent adhesion, waterproof property, ozone resistance, durability and weather resistance even under severe marine conditions, and to permit cost- and time-efficient repairing and reinforcing work. A mortar composition for repairing and reinforcing marine concrete structures comprises a base material, a curing agent and a mixed aggregate. The mortar composition comprises: 100 wt% of a base material containing 25-85 wt% of a base epoxy resin formed of a bisphenol A type epoxy resin alone or in combination with a bisphenol F type epoxy resin and 15-75 wt% of a reactive plasticizer formed of any one selected from a polyester plasticizer, an epoxy plasticizer, and an epoxy plasticizer prepared by polymerizing a dimeric acid and an epoxy resin; 20-40 parts by weight of a curing agent containing at least one of an aliphatic amine curing agent, an alicyclic amine curing agent, an aromatic amine curing agent, an acid anhydride curing agent and an imidazole curing agent based on 100 parts by weight of the base material; and 300-600 parts by weight of a mixed aggregate.

Description

Mortar composition for reinforcement of underwater concrete structures and method for reinforcement of concrete structures using the same {Mortar composition for reinforcement of underwater concrete structure and method for reinforcement of concrete structure using

1 is a cross-sectional view of an underwater concrete structure using the deformed formwork constructed by the repair and reinforcement method of the underwater concrete structure according to the present invention

2 is a cross-sectional view of the structure in the case of using the formwork as a stationary formwork in the above-mentioned reinforcement structure

<Description of the symbols for the main parts of the drawings>

10: concrete structure 20: rust-treated steel or glass grid

30: formwork 30 ': stationary formwork

31: glass fiber panel 32: basic aggregate

40: auxiliary formwork 100: mortar composition

The present invention relates to a mortar composition for reinforcing reinforcement of underwater concrete structures, and more specifically, for reinforcing and reinforcing reinforcement of underwater concrete structures including a main epoxy resin, a noblock epoxy resin, a reactive plasticizer, and a hardener and a mixed aggregate. It relates to a mortar composition.

In general, civil engineering and buildings of concrete will deteriorate indoor and outdoor walls, floors, and ceilings over time. Due to various deterioration phenomena such as peeling, peeling, abnormal cracking, and neutralization of concrete, the compressive strength of concrete and tensile strength due to corrosion of reinforcing steel are reduced, causing damage to reinforced concrete and further collapse. Problems of safety accidents such as damage to structures due to corrosion have emerged. Various repair and reinforcement methods have been derived. Among them, the pillar part of the structure installed in water is in constant contact with water, and in the case of severe conditions such as salt water environment of seawater, special repair at a higher level than the materials and methods used under general environment It requires a way.

The conventional repair and reinforcement method of underwater concrete structure is largely divided into three.

The first method is to perform concrete surface treatment with water removal and reinforcement by pouring steel cement mortar. If this method is adopted, the adhesion between the old and new concrete interfaces is poor, the construction period is long, and the construction cost is long. Has the disadvantage of being expensive.

Accordingly, as a second method, an underwater cured epoxy was recently developed, and a method of reinforcing the coating cured method in water by laminating the above-mentioned cured epoxy on carbon fiber or glass fiber was used. This method is to remove the old or oxidized surface in water with water pressure and to smooth out or smooth the uneven part with epoxy putty in water, and the surface picking work is not easy when it is carried out in water. However, in the case of severe irregularities, the fibers cannot be completely attached to each other, resulting in partially unattached parts, and the shrinkage expansion ratio of the coated surface of the concrete structure and the composition differs from each other at such unattached areas, so that cracks may occur when shrinking or expanding. There were many drawbacks due to the severe and uplifting. In order to minimize such shrinkage and expansion, fillers were examined, but insufficient to prevent the peeling phenomenon.

 The third method is to mortar underwater by mixing phosphorus or aggregate with epoxy resin in water. This is a method of mixing and extruded by mixing silica sand or aggregate in the epoxy resin underwater, or mixing the spherical phosphorus which is spherical. This method also causes peeling and cracking due to shrinkage and expansion at the interface when the thickness is more than a certain thickness. I have a problem.

In general, the epoxy resin mortar composition used in water is composed of bisphenol-A epoxy resin as a basic epoxy resin, and a hardening accelerator, diluent, filler, and other additives are added to improve workability, and thus, the physical and chemical properties required are implemented. Usually, a hardener is added to it to complete the composition.

The invention disclosed in Patent Application No. 10-2006-0027196 is a composition for reinforcing aquatic structures, wherein a bisphenol A type epoxy is used as a basic epoxy resin, and a bisphenol F type epoxy is used to supplement physical properties, and an aliphatic difunctional epoxy reactive diluent It took the structure which adjusts the viscosity with the. However, when using a large amount of such a reactive diluent, fluidity can be secured, but durability, impact strength, etc. are very low, there is a disadvantage that a separate supplement should be prepared. In the present invention, the composition was completed by using a reactive plasticizer instead of a reactive diluent to compensate for this.

The present invention is to solve the above problems, by applying the reinforcement mortar composition and repair method of the underwater concrete structure provided by the present invention to the underwater structure, good adhesion and waterproofness, ozone resistance, The technical problem of the present invention is to maintain durability, weather resistance and salt resistance in seawater, and to enable economic construction in a short time.

In addition, through the reinforcing reinforcement mortar composition provided through the present invention to realize the cross-sectional recovery method of the underwater structure that was not previously possible in the water to be the technical problem of the present invention.

In addition, an object of the present invention is to prevent the peeling, peeling of the interface due to different shrinkage expansion coefficient between the existing concrete and the reinforcing reinforcing material.

The object of the present invention by the main epoxy resin further comprises a reactive plasticizer and a noblock epoxy resin, and a mortar composition for reinforcing reinforcement of the underwater concrete structure comprising a mixed aggregate with a hardener and a concrete reinforcement method of the concrete structure using the same Can be achieved.

Hereinafter, a mortar composition for reinforcing reinforcement of an underwater concrete structure and a reinforcing method for a concrete structure using the same will be described in detail with reference to the configuration of the present invention.

Mortar composition for reinforcing reinforcement of underwater concrete structure basically consists of the main body, hardener, and mixed aggregate.

The subject consists of a base epoxy resin and a reactive plasticizer.

The subject matter may further comprise a noblock epoxy resin, and may further comprise trace amounts of antifoam and defoamer.

The basic epoxy resin in this invention mainly uses a bisphenol-A epoxy resin, and can mix and use a bisphenol F epoxy resin suitably here.

In addition, it is preferable to use an epoxy plasticizer for the reactive plasticizer.

The curing agent is formed by mixing at least one aliphatic amine curing agent, alicyclic amine curing agent, aromatic amine curing agent, acid anhydride curing agent, and amidazole curing agent. The curing agent of the present invention is mainly composed of an aliphatic amine curing agent and can be used by mixing the remaining curing agent.

In addition to the curing agent may further include a curing accelerator, the curing accelerator may be used at least one of phenol, cresol, nonylphenol, bisponol, polymercaptan, piperazine mixture.

The mixed aggregate may use at least one of barium lactate, urea resin, bentonite, and silica as a basic aggregate and fluidity or thixotropic imparting agent, dispersant, and precipitation preventing agent.

In addition, the mortar composition further comprises a copper powder together with an inorganic silver nano or inorganic silver nano, which is an antimicrobial agent, is preferable for preventing microorganisms from parasitic paralysis on the mortar reinforced in water or preventing oxidation by other bacteria.

In addition, the reinforcement method of the underwater concrete structure according to the present invention using the mortar composition includes (a) a chipping step of trimming damaged concrete surface; (b) a grating installation step of inserting and fixing the rust-treated steel or fiberglass gratings around the surface of the target concrete structure; (c) a formwork installation step of installing formwork around the reinforcing bar or glass fiber grid; (d) a composition placing step of reinforcing the cross section of the concrete structure by pouring the mortar composition.

Here, the step (c) installation of the formwork is a conventional formwork (formerly installed formwork) consisting of a plate formed by bonding the basic aggregate evenly sprayed on the glass fiber panel laminated glass fiber or carbon fiber on the epoxy resin It is preferable to further include a stationary formwork installation step of attaching and installing the inner surface of the formwork.

In addition, the thickness of the underwater concrete reinforcement structure is 30 to 150mm is preferable for the solid yet economical construction.

Hereinafter, the main material and the hardener in the reinforcement mortar composition of the underwater concrete structure, the composition of the aggregate, the content and the properties of the materials will be described.

In the main body 100% by weight of the reinforcing mortar composition of the water-reinforced concrete structure of the present invention, the base epoxy resin 25 to 85% by weight, the reactive plasticizer comprises 15 to 75% by weight, based on 100 parts by weight of the main It is preferable to contain a hardening | curing agent 20-40 weight part and mixed aggregates in a 300-600 weight ratio.

When the main ingredient further comprises a noblock epoxy resin, 100% by weight of the main material includes 10 to 70% by weight of the base epoxy resin, 1 to 50% by weight of the noblock epoxy resin, and 15 to 75% by weight of the reactive plasticizer.

Since the present invention is intended to maintain the adhesion in water, the water molecules and the resin buried in the adherend is ion exchanged to the resin instead of water, the adhesive force is 20kgf / cm ² or more can be used in water.

In addition, concrete has a strong alkalinity (pH 12.5), the mortar composition has a chemical resistance, and initially has a strong adhesive force, but with the bad conditions such as the penetration of salt substances having carbon dioxide gas, chlorine ions over time, Because of the strong deterioration of adhesion due to oxidation or neutralization, it should also have the property of retaining adhesion for a long time.

First, the meaning of the nature, role and content of the constituents of the subject will be examined.

First, the bisphenol A type and bisphenol F type epoxy resins used as the basic epoxy resin will be examined. The former may be used as a main material in both, and the latter may be mixed and used suitably.

Bisphenol A-type epoxy resins, which are generally used as basic epoxy resins in the epoxy resin composition in water, play a role in which the curing agent of the epoxy composition expresses adhesion and strength to concrete structures or steel structures, and has reactivity, plasticity, chemical resistance, and adhesiveness. Excellent toughness, high temperature

The bisphenol F type epoxy resin has excellent compatibility with other resins, has excellent low temperature curing properties, and is mixed here to supplement the properties of the bisphenol A type epoxy resin, and the epoxy can be smoothly coated on the concrete surface in water. It plays the role of making it work.

Considering the component content, if the base epoxy resin is 25% by weight (10% by weight with noblock epoxy resin) or less based on 100% by weight of the main component, the desired adhesive strength cannot be obtained, and 85% by weight (noblock epoxy resin) In the case of containing more than 70% by weight), the adhesive strength is good, but the epoxy condensed in water, poor workability. In addition, in the ratio of bisphenol A type epoxy resin and bisphenol F type epoxy resin, it may be economical to use only bisphenol A type epoxy resin independently, and the ratio is 60:40 or less, and the ratio is 60:40 or less. If more is used, there is a problem that the indispensable adhesion, toughness, etc. are indispensable as the basic epoxy resin.

Second, the reactive plasticizer included in the subject matter which is one of the technical features of the present invention will be described.

In general, resins with high hardness have low shrinkage expansion rate and low flexibility, so when warpage occurs due to earthquake or tectonic change, cracking occurs or peeling phenomenon at the interface with concrete is very weak to impact. In addition, since the pier underwater beam is impacted by a material such as a rock floating in the rainy season during the rainy season, the lower side of the pier is damaged, so that the damaged portion is widened over time. Conversely, if the hardness is low, there is no problem in fresh water, but the salt resistance is weak in seawater.

Typically, when the hardness of the mortar composition is 80 / shore D or more, there is little elongation, and cracking or peeling occurs due to shrinkage and expansion of concrete. Therefore, the mortar composition can prevent cracking or peeling when the shrinkage expansion ratio is about the same as that of concrete and when the compressive strength is 1 to 1.5 times that of the concrete.

In the case of the existing underwater epoxy composition, the shrinkage expansion rate between the epoxy resin composition and the concrete is different, causing a peeling phenomenon, or even after adjusting the shrinkage expansion rate using an additive such as a diluent to the hardener, As time passed, fluidity (shrinkage expansion) was lost, so there was a disadvantage that it did not have shock resistance.

In several experiments, it was found that when the reactive plasticizer is employed in the composition of the subject, it is possible to impart fluidity to the composition and to maintain such properties for a long time to prevent seismic characteristics or fatigue fatigue due to impact.

Then, the kind and role of the reactive plasticizer will be examined.

First, the types of general plasticizers include phthalic acid, trimellitic acid, phosphite, epoxy, polyester, alapathic, and anti-chlorine, depending on their chemical structure. Phthalate plasticizers such as 2-etylhexy) and DBP (di-butyl-phthalate). In the present invention, phthalic acid is DOM (Dioctylmaleate), epoxy or polyester plasticizer. Among these, a resin-based, that is, a reactive plasticizer of epoxy and polyester is preferably used. Even more preferably, an epoxy plasticizer prepared by polymerizing dimer acid and an epoxy resin is used as a composite having a slow aging and excellent durability.

 The role of the reactive plasticizer serves as a diluent to adjust the shrinkage expansion rate of the composition as described above, and to prevent the composition from hardening quickly.

In consideration of the component content, when the reactive plasticizer is added to 15% by weight or less of the reactive plasticizer, the desired shrinkage expansion ratio cannot be obtained. When the reactive plasticizer is added to 75% by weight or more, the compressive strength is increased. The problem may be greatly degraded.

Third, another technical feature of the present invention is a novel block epoxy resin.

In general, epoxy resins have good adhesion since they have excellent chemical resistance, but when they are in direct contact with water in water, they exhibit a phenomenon of deterioration. In particular, salt resistance is important in a seawater environment. The noblock epoxy resin is mainly used in the field of electrical and electronic fields, and is a resin having excellent chemical resistance and heat resistance. It became. Therefore, when not used in the composition for seawater it may not be used a somewhat expensive said noblock epoxy resin.

Considering the content of the component, when added to less than 1% by weight of the noblel epoxy resin relative to 100% by weight of the main body, it is difficult to ensure the salt-resistant properties, and when more than 50% by weight there is a problem that deterioration in water workability .

In this way, we looked at the components of the subject. In addition to the base material of the subject matter, it is preferable to add a small amount of an antifoaming agent and a defoamer to prevent the generation of bubbles during the injection of the mortar composition.

Next, each of the meanings of the properties, roles, and contents of the constituents of the curing agent in the mortar composition for repairing and strengthening the underwater concrete structure of the present invention will be examined.

Epoxy resins are rarely used alone, and used in combination with a curing agent to cure with a three-dimensional thermosetting material, the performance of which is largely dependent on the selection of the curing agent.

The curing agent is obtained by mixing at least one of an aliphatic amine curing agent, an alicyclic amine curing agent, an aromatic amine curing agent, an acid anhydride curing agent, and an amidazole curing agent. The hardening | curing agent in the preferable experimental example of this invention mentioned later used the aliphatic amine-type hardening | curing agent which is strong in alkali and acid, and is good in water as a main hardening | curing agent.

When the curing agent is contained in 20 parts by weight or less with respect to 100 parts by weight of the main body, the curing properties are inferior, on the contrary, when contained in 40 parts by weight or more, there is a disadvantage that it is difficult to ensure fluidity.

It is preferable to use the hardening | curing agent in this invention with a hardening accelerator. The curing accelerator may use at least one of phenol, cresol, nonylphenol, bisponol, polymercaptan, piperazine mixture, the weight ratio is 0.5 to 3 parts by weight based on 100 parts by weight of the main hardening or low temperature It is desirable to be able to cure to enhance the properties of the curing agent. When the curing accelerator is added in an amount of 0.5 parts by weight or less with respect to 100 parts by weight of the main body, it may not function as a curing accelerator, and when added in an amount of 3 parts by weight or more, the curing agent may not exhibit the properties of the curing agent. have.

Next, the nature, role, and content of constituents of the mixed aggregates in the mortar composition for repairing and strengthening the underwater concrete structure of the present invention will be examined.

The repair reinforcement method to be used in the present invention is a filling mortar method, and when the mixed mortar composition is to be added, the fluidity must be excellent to allow good mortar construction without voids. In addition, after the mortar composition is cured, basic aggregates or fillers may be uniformly distributed to ensure a constant durability. If the basic aggregate or filler is sedimented and the main and basic aggregates are separated, the impact or durability may be degraded, causing cracking. The mixed aggregate is used to ensure such fluidity, durability and dispersibility.

First, as the basic aggregate, commonly used aggregates such as silica sand, remittal, martha, loess soil, earth and sand, crushed aggregate, gravel and sand may be used. In the preferred experimental example of the present invention to be described later, the silica sand was used in the double, and the silica sand of various sizes were mixed to maximize fluidity.

Second, it will be described for the material that gives the fluidity or thixotropy, or acts as a dispersant or precipitation inhibitor.

Aggregate separation occurs when the composition is cured, so the durability of the aggregate may be low and cracks or peeling may occur. Conventionally, reactive diluents have been used to reduce the viscosity of compositions in order to improve flowability, defoaming, and easy addition of other additives to epoxy resins. However, when a large amount of such a reactive diluent is used, fluidity can be secured, but cracking is severe because durability and impact strength are significantly lowered. Thus, the present invention overcomes the above problems by utilizing a mixed aggregate.

First, a basic fluidity is secured by adding a leveling agent. In a preferable experimental example of the present invention described later, a urea resin was used as the leveling agent.

In addition to the leveling agent, bentonite and silica were used to impart thixotropy, and barium lactate was used as a dispersant and an anti-precipitation agent for even dispersion and precipitation prevention of the basic aggregate.

Looking at the content of the mixed aggregate, when the amount of the mixed aggregate is 300 parts by weight or less based on 100 parts by weight of the composition is difficult to ensure the fluidity of the composition, the workability deteriorates, if more than 600 parts by weight of the main component is relatively small There is a problem that the properties such as adhesive strength is weakened.

The mortar composition further includes an inorganic silver nano or an antimicrobial agent in which copper powder is added to the inorganic silver nano, and a weight ratio thereof may be used in an amount of 1 to 5 parts by weight based on 100 parts by weight of the main ingredient. In the case of the use of microorganisms such as bacteria or barnacles such as barnacles to prevent the oxidized by sticking to the structure, the present invention is used in the case of the case of using the epoxy resin of the main material oily material in the case of the case of inorganic silver nano or the silver nano copper A material in which a small amount of powder was added was employed.

Finally, the repair and reinforcement method of the underwater concrete structure using the mortar composition.

1 is a cross-sectional view of an underwater concrete structure using a deformed formwork constructed by the repair and reinforcement method of the underwater concrete structure according to the present invention, Figure 2 is a case of using the formwork as a fixed formwork in the repair and reinforcement structure Sectional view of the structure.

Formwork can be classified into deformable type and fixed type. Deformable formwork is applied to the method of applying mold to the formwork, pouring mortar composition, and curing to remove the formwork, while the stationary formwork is made of acid and water resistant materials. After the mold is manufactured and installed, the mortar composition is applied to a method not to be removed even after pouring and curing. The one shown in FIG. 1 uses deformable formwork, and the one shown in FIG. 2 uses a stationary formwork.

First, the concrete reinforcement method using the deformed formwork, referring to Figure 1, the repair reinforcement method is (a) to repair the damaged concrete surface 10 by the chipping process (chipping step), (b) antirust treatment Inserting and fixing the reinforced steel or glass fiber grating 20 around the surface of the target concrete structure 10 (lattice installation step), and (c) installing the formwork 30 around the reinforcing steel or glass fiber grating 20. After the (installation step) (d) the mortar composition 100 is poured to reinforce the cross section of the concrete structure (composition of the casting step).

Here, the reinforcing bar or glass fiber grating 20 is used as a reinforcing material, and was used to prevent cracking by dispersing an impact caused by an earthquake or a high flow rate. The reinforcing bar or glass fiber grating 20 is manufactured on the ground in the form of a mesh, and fixed to the circumferential portion of the concrete structure.

Next, referring to FIG. 2 for concrete reinforcement method using a stationary formwork, after the above (a) chipping step and (b) lattice installation step, the formwork installation step of (c) is the formwork of FIG. (30) as a dismantleable auxiliary formwork (40) is installed first, and the base of different sizes of silica sand 1 to 3 on the glass fiber panel 31, in which glass fiber or carbon fiber is laminated on the inner flame-retardant epoxy resin. It is installed by attaching the fixed formwork (30 ') made of a plate adhered by uniformly spraying the aggregate (32), (d) can be applied to the fixed formwork utilization method finishing the composition pouring step.

The fixed formwork used in the present invention is laminated to glass fiber or carbon fiber in an epoxy resin to have a thickness of 3 to 5mm, and evenly disperses basic aggregates (preferably 1 to 3 silica sand) having different sizes thereon. An epoxy resin laminated on glass fiber and a plate bonded to the basic aggregate are used, and the deformable formwork is used as an auxiliary formwork for demolition, and the fixed formwork is installed therein.

Here, the epoxy resin constituting the fixed formwork is applied to the patent invention of the 'acid-resistant and flame-retardant epoxy resin' of the Patent Application No. 10-2004-76879 filed by the applicant of the present invention, the chemical resistance in the underwater environment, It is preferable for securing salt resistance.

When the fixed formwork is utilized, the cured mortar composition is not exposed to water even after removing the auxiliary formwork after the curing or curing of the mortar composition is finished, compared to the case of using the deformable formwork. It has the advantage of maximizing chemical resistance and salt resistance.

In the reinforcement reinforcing method, the following "repair structure" refers to a reinforcement structure consisting of the 'mortar composition', 'reinforced or glass fiber lattice', and 'forms'.

When the thickness of the reinforcing reinforcing structures in the underwater concrete reinforcing methods is about 30 mm to 150 mm in width around the damaged concrete structure, the stability of the reinforcing reinforcing structures can be secured and economical, and the flow rate is weak. Where it is 30 to 80mm, where the flow velocity is strong, or in the case of reinforcement of coastal structures, the construction is to a thickness of 80 to 150mm. Among these, the reinforcement or glass grid is fixed to 10 to 12mm from the concrete structure. Such a method of pouring the mortar composition directly into the narrow space in the form using the mold is possible to have a water resistance, durability, dispersibility of the composition, and is an economical and permanent reinforcement method.

If the thickness of the repair reinforcing structure is less than 30mm, it is difficult to obtain the desired strength, acid resistance and the like, on the contrary, if it is 150mm or more, it is difficult to avoid the peeling phenomenon due to the shrinkage expansion rate.

This cross-sectional reinforcement method has conventionally been not used in underwater reinforcement work because the mortar composition itself to be poured in water disintegrates in water and cannot maintain its properties. Thus, using the mortar composition according to the present invention can be carried out in the above-described underwater filling mortar method through a simple method of economical, short construction period.

Hereinafter will be described in detail through experimental examples of the mortar composition for repairing and strengthening the underwater concrete structure according to the present invention.

In the experimental example of the present invention, the chemical resistance, salt resistance, adhesion strength, workability, and the like of the filling mortar composition were measured. The measuring method is as follows.

(Chemical resistance)

The mortar composition of the present invention was deposited on a solution of 7% sulfuric acid and 7% hydrochloric acid to measure acid resistance and alkali resistance by depositing on a 10% solution of caustic soak. Was reviewed.

(Flame-resistant)

The mortar composition was immersed in a 10% salt solution at 23 ° C. for 168 hours, and then examined for appearance swelling and surface color change.

(Adhesive strength)

Bonding strength of the concrete structure and the mortar composition was tested through a pull-off test based on uniaxial tension after 5 days in water at 23 ℃ temperature.

(Workability)

The mortar composition was poured into a jig having a width of 50 mm, a length of 50 mm, and a length of 1,000 mm to one side to examine fluidity and mixing properties.

(Whether cracks occur)

Cracks generated through chemical resistance, salt resistance, adhesion strength, and compressive strength tests were examined by visual inspection.

(Hardness)

Hardness tests were performed according to ASTM D 2240 via durometer hardness (type D).

(Compressive strength)

It was measured by a universal testing machine according to the KS M 3015 test method.

(Silicate precipitation)

Mortar mixed in 50mm X 50mm X 140mm jig was added, cut after curing and visually inspected whether silica sand precipitated.

(Underwater curing state)

The composition was placed at 23 ° C. in water for 168 hours and examined for swelling, loosening, softness, scratches, and degradation of durability.

(Mixed aggregate distribution chart)

The mortar composition was partially cut off after curing and the distribution of aggregate in its cross section was visually inspected.

Hereinafter, the constitution of the mortar composition of the present invention in various experimental examples of the present invention will be examined.

Experimental Example  One

The basic epoxy resin is a bisphenol A-type resin having an epoxy equivalent of 190 to 210 g / eq and a viscosity of 700 to 100 cps at 25 ° C., and a modified aliphatic amine is used as a curing agent, and there are different sizes of silica sand as a basic aggregate as a mixed aggregate. (No. 3, No. 5 and No. 7), to a composition in which a certain amount of barium lactate was mixed as a dispersant, a fluidity imparting agent and a precipitation preventing agent, the addition amount of the noblock epoxy resin having an epoxy equivalent of 170 to 180 g / eq as the phenol noblock type was changed. The chemical resistance, salt resistance, adhesion strength and workability of the prepared mortar composition were examined.

Experimental Example  2

The other components of the mortar composition are the same as in Experimental Example 1, the addition amount is constant, the addition amount of the reactive plasticizer obtained by synthesizing the dimer acid with the epoxy resin, and the crack formation, salt resistance, elongation, Hardness, compressive strength and workability were measured and examined.

Experimental Example  3

Add urea melamine resin as a leveling agent in the composition of the mixed aggregate, and change the amount of barium lactate as the silica sand (Nos. 3 and 7), dispersing agent, fluidizing agent and anti-settling agent of different size as the basic aggregate, and other experiments. A constant amount of the same structure as in Example 2 was added, and the salt resistance, crack occurrence, hardness, silica sand precipitation, and mixed mortar filling workability of the mortar composition formed by mixing were examined.

Experimental Example  4

The other configuration is the same as Experimental Example 3, and bentonite is added as the thixotropic filler, and the composition ratio of each component is changed, and underwater adhesion, impact strength, flowability, salt resistance, mixed aggregate distribution, crack generation, water resistance , The state of curing in water was examined.

Table 1 shows the results of examining the chemical resistance, salt resistance, adhesion strength, workability aspects of the mortar composition produced by each experiment while increasing the amount of noblock resin on the subject of the mortar composition in Experimental Example 1 have.

As shown in Table 1, as the noblock resin increases, the chemical resistance is good, but the workability is poor. Through the above experiment, it was found that the composition of Experiment B showed the best characteristics, and several times through different experiments, the composition having both workability and chemical resistance in the case of 1 to 50% by weight of the noblock epoxy resin based on 100% by weight of the subject Could get

However, in the seawater environment with a salt content of 10% or more, it is difficult to use the experimental D type, but the chemical resistance is excellent and there is no peeling phenomenon.

[Table 2] in the following Experimental Example 2 increases the reactive plasticizer as the composition of the subject when added, the frequency of crack generation, salt resistance, elongation, hardness, compressive strength, workability of each composition qualitatively and quantitatively It is the result of investigation.

As shown in Table 2, as the content of the reactive plasticizer increases, the elongation increases with increasing hardness and the hardness increases. In this experimental example, Experiment C showed the best characteristics.

Based on these results, when the shrinkage expansion ratio of the mortar composition is similar to that of the concrete, it can be seen that when the compressive strength is about 1 to 1.5 times that of the concrete, cracking and peeling are less likely. As a result, the compressive strength of the composition was in the range of 1 to 1.5 times that of concrete, and the shrinkage expansion ratio averaged 0.02% when the content was 15 to 75% by weight based on 100% by weight of the main body. Close.

 Table 3 below shows the results of examining the amount of mixed aggregates in Experimental Example 3 while examining the salt resistance, crack occurrence, hardness, silica sand precipitation, and filling workability of each mortar composition.

As shown in Table 3, the composition of Experiment C type was found to be excellent in all properties. On the basis of this, it can be seen that the dispersibility such as silica sand sedimentation when the content of the mixed aggregate is 300 to 600 parts by weight compared to 100 parts by weight of the main body is good, but also has salt resistance.

In Table 4 below, the optimum composition ratio was found while changing the content of the main body, the curing agent, and the aggregate aggregate in Experimental Example 4.

As shown in Table 4, this optimum composition ratio is shown in the composition of Experiment C type, and the optimum composition ratio derived from Table 4 is 37.5 wt% of basic epoxy resin and 25 wt% of noble epoxy resin based on 100 wt% of the main composition. It consists of 37.5% by weight of reactive plasticizer, with respect to 100 parts by weight of the main ingredient, 25 parts by weight of hardener, 500 parts by weight of mixed aggregate.

In the above, the configuration of the present invention was described in detail with reference to various experimental examples. However, the scope of the present invention is not limited to the above experimental examples, and may be embodied in various forms of experimental examples within the scope of the appended claims. Without departing from the gist of the invention as claimed in the claims, it is intended that such modifications can be made by any person skilled in the art to which the invention pertains and are within the scope of the claims.

According to the mortar composition for repair and reinforcement of the underwater concrete structure of the present invention and the repair and reinforcement method of the concrete structure using the same, each component, the content of the above-described mortar composition acts to maintain excellent adhesion to the water swelling by impact There is no damage or damage, it is possible to obtain a structure reinforcement composition having earthquake-resistant characteristics that do not occur peeling phenomenon due to vibration and environmentally friendly without VOC (volatile material). In addition, silver nano material was added to prevent corrosion of the repair and reinforcement structure by microorganisms.

In addition, cracking did not occur using a method using reinforcing bars, glass fiber lattice, or fixed formwork as a reinforcing agent, and showed excellent weather resistance. Therefore, when the present invention is applied to underwater structures, such as underwater piers, underwater beams, dams, offshore structures, subsea tunnels, sewage treatment plants, thermal power plants, wastewater treatment plants, etc., it is possible to shorten the air and at the same time have an economic effect. have.

Claims (9)

In the mortar composition for repair and reinforcement of an underwater concrete structure comprising a main body, a hardener, and a mixed aggregate, Bisphenol A-type epoxy resin alone or mixed with bisphenol F-type epoxy resin 25 to 85% by weight of a polyester plasticizer, epoxy plasticizer, epoxy plasticizer prepared by polymerizing dimer acid and epoxy resin 100 wt% of a subject matter, including 15-75 wt% of a reactive plasticizer; About 100 parts by weight of the subject matter, 20 to 40 parts by weight of a curing agent formed by mixing at least one of an aliphatic amine curing agent, a substituted amine curing agent, an aromatic amine curing agent, an acid anhydride curing agent, and an amidazole curing agent; Mortar composition for maintenance reinforcement of the underwater concrete structure, characterized in that it comprises 300 to 600 parts by weight of the mixed aggregate. In the mortar composition for repair and reinforcement of an underwater concrete structure comprising a main body, a hardener, and a mixed aggregate, Bisphenol A type epoxy resin alone or mixed with a bisphenol F type epoxy resin, 10 to 70% by weight of base epoxy resin, 1 to 50% by weight of a noblock epoxy resin, polyester plasticizer, epoxy plasticizer, dimer acid and epoxy resin 100 wt% of the main composition including 15 to 75 wt% of a reactive plasticizer made of any one of the epoxy plasticizers prepared; About 100 parts by weight of the subject matter, 20 to 40 parts by weight of a curing agent formed by mixing at least one of an aliphatic amine curing agent, a substituted amine curing agent, an aromatic amine curing agent, an acid anhydride curing agent, and an amidazole curing agent; Mortar composition for maintenance reinforcement of the underwater concrete structure, characterized in that it comprises 300 to 600 parts by weight of the mixed aggregate. delete The method according to claim 1 or 2, The curing agent further comprises a curing accelerator of at least one of phenol, cresol, nonylphenol, bisponol, polymercaptan, and piperazine mixture, wherein the weight ratio is 0.5 to 3 parts by weight based on 100 parts by weight of the main body. Mortar composition for maintenance reinforcement of underwater concrete structure. The method according to claim 1 or 2, The mixed aggregate is at least one of silica sand, remittal, martha, loess soil, earth and sand, crushed aggregate, gravel, sand; A mortar composition for repairing and strengthening an underwater concrete structure, comprising at least one of barium lactate, a leveling agent, bentonite, and silica as a fluidity or thixotropic agent, a dispersant, and a precipitation inhibitor. The method according to claim 1 or 2, The mortar composition further includes a material in which copper powder is added to inorganic silver nano or inorganic silver nano which is an antimicrobial agent, The weight ratio is 1 to 5 parts by weight based on 100 parts by weight of the main body mortar composition for maintenance reinforcement of the underwater concrete structure. In the reinforcing method of underwater concrete structure,  (a) chipping the damaged concrete surface;  (b) a grating installation step of inserting and fixing the rust-treated steel or fiberglass gratings around the surface of the target concrete structure;  (c) a formwork installation step of installing formwork around the reinforcing bar or glass fiber grid;  (d) Reinforcing method of underwater concrete structure comprising the step of placing the composition to reinforce the cross-section of the concrete structure by pouring the mortar composition of claim 1 or claim 2. The method of claim 7, wherein The formwork installation step is a fixed formwork formed by attaching a fixed formwork made of a plate material bonded by spraying evenly No. 1 to 3 silica sand on a glass fiber panel laminated glass fiber or carbon fiber on an epoxy resin to the inner surface of the formwork of claim 7 Repair and reinforcement method of the underwater concrete structure characterized in that it further comprises an installation step. The method of claim 8, Repairing method of underwater concrete structure, characterized in that the thickness of the underwater concrete reinforcement structure is 30 to 150mm.

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