KR20230096600A - Filling materials for seismic retrofit and facing bricks walls of educational facilities using the same - Google Patents

Abstract

The present invention relates to an earthquake-resistant reinforcing filler capable of preventing loss of life due to dropping and falling of an outer stucco brick wall in the event of an earthquake, a stucco brick wall using the same, and an educational facility equipped with the stucco brick wall, according to the present invention. By providing seismic reinforcing filler for the stucco brick walls of educational facilities, it is possible to prevent loss of life due to the fall and fall of the stucco walls on the outer wall in the event of an earthquake, and development of brick structure and non-structural seismic reinforcement methods There are spots that can contribute to this.

Description

Filling materials for seismic retrofit and facing bricks walls of educational facilities using the same}

The present invention relates to a seismic reinforcing filler and a stucco brick wall of an educational facility using the same, and more particularly, to an earthquake-resistant reinforcing filler that can prevent loss of life due to dropping and falling of an outer wall stucco wall in the event of an earthquake, and using the same It relates to a stucco brick wall and an educational facility having the stucco brick wall.

On November 15, 2017, a magnitude 5.4 earthquake occurred in Pohang, South Korea. The Pohang earthquake was smaller in scale than the Gyeongju earthquake in 2016, but the amount of damage was calculated to be about 65 billion won, which is six times higher.

In particular, damage to facilities was 25,362 private facilities and 317 public facilities, and the amount of damage was 29.4 billion won and 25.6 billion won, respectively. This corresponds to 84.6% of the total damage caused by the Pohang earthquake. At this time, since public facilities such as schools, roads, and bridges are larger than private facilities, a huge amount of damage has occurred compared to relatively small damaged areas.

According to statistics from the Ministry of Public Administration and Security of the Republic of Korea, during the 2017 Pohang earthquake, the most damaged public facilities were educational facilities. Damage to educational facilities was 103, accounting for 32.5% of the total, and the amount of damage was 12.5 billion won, accounting for 49.1% of the total.

Educational facilities are mostly damaged by non-structural components installed on the outer walls of buildings, and among them, damage by damage to the facing brick wall accounts for the highest proportion.

In particular, in Korea, most of the educational facilities are outdated, and the exterior is often remodeled with stucco brick walls. However, since the stucco brick wall is constructed in a hollow masonry method, such as Korean Patent Registration No. 10-2300604, there is no structure, that is, a concrete wall and a separate connector. That is, when an earthquake occurs, there is a very high risk of human accidents due to falling off and overturning of stucco bricks.

In this way, as many damages to non-reinforced stucco brick walls occur during earthquakes, the social demand for seismic reinforcement of non-structural structures is increasing. For this reason, seismic reinforcement of stucco brick walls for educational facilities is urgently needed.

Republic of Korea Patent Registration No. 10-2300604

As a result of conducting research to solve the problems of the prior art, the inventors of the present invention supplement the problems of the stucco brick wall by adopting a method of constructing a filling material between the external stucco brick wall and the internal concrete wall, and the aging educational facility The present invention was completed by finding out that the seismic reinforcement of the can be promoted.

Accordingly, an object of the present invention is to provide an earthquake-resistant reinforcing filler suitable for stucco brick walls of educational facilities.

Another object of the present invention is to provide a stucco brick wall using the seismic reinforcing filler and an educational facility having the stucco brick wall.

In order to achieve the above object, the present invention includes sand, a synthetic polymer, and a curing agent, wherein the synthetic polymer includes an epoxy resin, rubber, an aliphatic diol, and aluminum hydroxide, and the curing agent includes a polyamide resin, an aliphatic diol, and a curing agent. Provided is a filler for seismic reinforcement containing aluminum hydroxide.

In one embodiment of the present invention, the seismic reinforcement filler may include 25 to 35 parts by weight of the synthetic polymer and 25 to 35 parts by weight of the curing agent based on 100 parts by weight of the sand.

In one embodiment of the present invention, the synthetic polymer may include the epoxy resin, rubber, aliphatic diol, and aluminum hydroxide in a weight ratio of 2.5 to 3.5: 0.5 to 1.5: 0.5 to 1.5: 3.5 to 4.5.

In one embodiment of the present invention, the curing agent may include the polyamide resin, the aliphatic diol, and aluminum hydroxide in a weight ratio of 2.5 to 3.5: 0.5 to 1.5: 3.5 to 4.5.

In one embodiment of the present invention, the seismic reinforcement filler may include the sand, the synthetic polymer, and the curing agent in a weight ratio of 1:0.3:0.3.

In one embodiment of the present invention, the synthetic polymer may include the epoxy resin, rubber, aliphatic diol, and aluminum hydroxide in a weight ratio of 3:1:1:4.

In one embodiment of the present invention, the curing agent may include the polyamide resin, the aliphatic diol, and aluminum hydroxide in a weight ratio of 3:1:4.

In one embodiment of the present invention, the aliphatic diol is ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-butylene glycol, polyethylene glycol, polypropylene glycol, dipropylene glycol, tripropylene glycol and tetraethylene. It may be one or more selected from the group consisting of glycols.

In one embodiment of the present invention, the seismic reinforcement may be seismic reinforcement for a stucco brick wall.

In one embodiment of the present invention, the stucco brick wall may be a stucco brick wall of an educational facility.

In order to achieve the above object, the present invention provides a stucco brick wall earthquake-resistant reinforced with the filler.

In order to achieve the above object, the present invention provides an educational facility having the stucco brick wall.

According to the present invention, by providing an earthquake-resistant reinforcing filler for the stucco brick wall of an educational facility, it is possible to prevent loss of life due to dropping and falling of the stucco wall of the outer wall in the event of an earthquake, and the brick structure and non-structural There is a point that can contribute to the development of the seismic reinforcement method.

1A is a schematic diagram showing a hollow masonry method according to the prior art, and FIG. 1B is a seismic reinforcement method through a filler according to an embodiment of the present invention.
Figure 2 shows the filler prepared in Example 1 (first experiment).
Figure 3 shows the filler prepared in Example 2 (second experiment).
Figure 4 shows the filler prepared in Example 3 (third experiment).

Hereinafter, the present invention will be described in detail with examples. Although the present invention has been described with reference to the embodiments shown in the drawings, this is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited.

<Example>

Experimental materials used in the following examples are mortar, epoxy resin, and acrylic resin. For non-shrinkage mortar, a mixture of Portland cement, silica and work performance improving material was used.

The non-shrinkage mortar has very little drying shrinkage and can sufficiently maintain the space between walls. Epoxy resin is one of the thermosetting plastics. It is resistant to water and weather changes, hardens quickly, and has strong adhesion. In particular, epoxy resin is very resistant to acids and alkalis and has excellent adhesiveness, so it is used in all fields, and it takes about 7 days to develop the highest strength.

In this embodiment, strength was improved by using polyamide together for curing in the mixing process. In addition, acrylic resin is mainly used as a substitute for glass and is used as an adhesive because of its very high adhesive strength.

Tables 1 and 2 below summarize the properties and advantages of epoxy resins and acrylic resins.

In addition, epoxy resins and acrylic resins have advantages such as excellent moldability, adhesiveness, chemical resistance, and water resistance, as shown in Table 2 above. In particular, the epoxy resin exhibits high elasticity and maximum adhesive strength after 5 minutes of pouring, and the acrylic resin has excellent weather-proof properties and does not require a curing agent.

1. Materials and Mixing Ratio

(One). 1st experiment

In the first experiment, three types of fillers were used. M-X filler used non-shrinkage mortar, and M-M filler used non-shrinkage mortar and Mathomor, an admixture for application to improve work performance.

E-S using a synthetic polymer material used an epoxy resin. The epoxy resin contains an aliphatic diol (ethylene glycol) as a reactive diluent and is used together with a polyamide-based curing agent.

The material mixing ratio of the filler produced in this example is shown in Table 3 below.

(2). 2nd experiment

Unlike the first experiment, the synthetic polymer material was changed from epoxy resin to water-soluble acrylic resin. Water-soluble acrylic resins are also used as adhesive materials for construction, as are epoxy resins.

Also, there is no need to mix the curing agent. Therefore, the process was simplified compared to the first experiment. As for the synthetic polymer material ratio of the second experiment, two chemical materials, No.106 and No.260, were prepared as shown in Table 4 below.

In No.260, Al(OH) ₃ was added to improve fire resistance performance compared to the first experiment. The mixing ratio of the materials is shown in Table 5 below. A total of six fillers were prepared by preparing three fillers each using No.106 and No.260.

Each filler tried to find the optimal price and performance by varying the ratio of synthetic polymer, water, and cement.

(3). 3rd experiment

Epoxy resin, a synthetic polymer material used in the first experiment, was used again. Unlike water-soluble acrylic resin, epoxy resin does not use water.

Therefore, it was judged that the adhesion between the walls would be better because drying shrinkage due to evaporation of water did not occur.

The ratio of synthetic polymer materials in the third experiment is shown in Table 6 below, rubber having elasticity, fatty acid diol (ethylene glycol) as a reaction diluent were added, and a polyamide-based curing agent helping to improve strength was used as the curing agent.

The mixing ratio of the filler is shown in Table 7 below. Styrofoam was added as a new material to reduce weight.

There are a total of three types of fillers. ESA fillers use sand, synthetic polymer materials, and hardeners. In addition, Al(OH) ₃ in powder form is used to improve fireproof performance and reduce viscosity between materials. was added. For the EFX filler, economical and lightweight Styrofoam was used instead of sand to reduce the weight of the construction method. The ESX filler removed the flame retardant from the ESA and increased the ratio of the main material and the hardening material.

2. Experimental results

The filling material test was an experiment to improve the defects that occurred during the test process. Experiments were conducted three times, varying the ratio and type of materials used in the filler. The experimental results are as follows.

(1) 1st test results

In the first experiment, fillers using epoxy resin and non-shrinkage mortar were tested. The E-S filler required time for mixing and tamping due to very low fluidity due to too high viscosity between the materials.

Figure 2 shows the filler prepared in the first experiment. When the compaction was insufficient during the placement process, as shown in FIG. 2, shrinkage occurred as air bubbles existing inside the ES filler escaped. In addition, during the curing process of the E-S filler, the sand and the main material were not mixed and material segregation occurred.

Since the M-M filling material and the M-X filling material are materials that have been previously used, no problems occurred in the experimental results.

(2) Second test result

In the second experiment, water-soluble acrylic resin was used instead of epoxy resin and polyamide-based curing agent as a synthetic polymer material. A total of 6 fillers using No.106 and No.260 were produced. Water, non-shrinkage mortar and main material were mixed in the process of making the filler.

Figure 3 shows the filler prepared in the second experiment. As a result of the experiment, as shown in FIG. 3 , moisture inside the filler evaporated and drying shrinkage occurred. As a result, although adhesion between the bricks used in the experiment is possible, it is judged that there is a possibility that the facing bricks may fall off and conduct because the adhesion strength with the concrete wall is not exhibited.

(3) Results of the 3rd experiment

In order to increase the adhesion with the concrete wall, epoxy resin and polyamide-based hardener, which are materials that do not shrink during the curing process, were used again. Unlike the first experiment, the ratio of Al(OH) ₃ was increased to lower the viscosity of the material, and rubber was added to improve elastic performance to prepare three fillers.

4 shows the filler prepared in the second experiment. As shown in FIG. 4, in the case of the ESA filler, Al(OH) ₃ in powder form was mixed in addition to the flame retardant added to the main material. As a result, the viscosity of the filler was lowered and the fluidity was increased. However, after curing, the bricks used in the experiment were not integrated with the filler and separated.

In the case of the E-F-X filler, Styrofoam was used for economy and light weight, but the main material leaked into the gap between the bricks and curing was not performed normally.

In the case of the ESX filler, Al(OH) ₃ in powder form was not used in the filler. Accordingly, the viscosity between the materials is higher than that of the ESA filler, and the fluidity of the filler is relatively low. However, the drying shrinkage of the ESA filler, a problem that occurred during the curing process, did not occur, and the material leakage problem of the EFX filler did not appear.

3. Conclusion

An object of the present invention is the development of a filler using a synthetic polymer to reduce the damage of stucco bricks used in educational facilities. The materials used in the experiment were epoxy resin, acrylic resin, and non-shrinkage mortar.

In the experiment, a filler was filled between the cement brick spaces and cured for 7 days. After curing, the following conclusions were drawn by considering the adhesion between bricks, drying shrinkage, and workability.

First, in the first experiment, a total of three fillers were produced: E-S mixed with epoxy resin and sand, M-X non-shrinkage mortar, and M-M mixed with mathomol in non-shrinkable mortar. As a result, material separation occurred in E-S. As a result, problems such as a decrease in the viscosity of the filler and a decrease in quality may occur during wall construction.

In addition, the workability is not good due to the material compaction time and low fluidity. The construction difficulty of M-X and M-M was the same as that of conventional mortar work, but an attempt was made to obtain a filler with better elastic behavior.

Second, in the second experiment, the synthetic polymer material was changed to supplement the problems of the first experiment. The modified material is a water-soluble acrylic resin. The viscosity between materials, which was a problem in the first experiment, is relatively lower than that of epoxy resin. Thus, the workability of the filler is improved.

In addition, the process is simplified because there is no use of a curing agent in the mixing process. However, since water-soluble materials are used, drying shrinkage of the filling material occurs as water evaporates. As a result, it was not properly maintained with the bricks. Improvement was needed for the drying shrinkage problem.

Third, in the case of the third experiment, an epoxy resin was used again to solve the drying shrinkage problem. Epoxy resin and rubber to increase elasticity were added to the chemical materials of the filler. In addition, Al(OH) ₃ was added to improve fire resistance while reducing viscosity. The filling materials were mixed with epoxy resin and other materials.

EFX mixed with Styrofoam, ESA mixed with sand and powdered Al(OH) ₃ , and ESX mixed with sand were fabricated. In the case of EFX, normal curing was not performed due to the leakage of the filler into the cracks of the bricks during the curing process. EFX mixed Al(OH) ₃ in powder form to reduce the viscosity of the filler. The adhesiveness with the wall was also lowered and the bricks were separated.

E-S-X had good viscosity and adhesiveness. In addition, defects such as drying shrinkage and material separation did not occur. That is, the problems that occurred in the first and second experiments were supplemented, and the problems that other fillers in the third experiment showed did not appear.

Finally, E-S-X filler was found to be most suitable for the seismic retrofit method of stucco brick walls in educational facilities. The results of the present invention can be used as basic data for the development of a method for earthquake-resistant reinforcement of decorative brick walls of new educational facilities that can be applied in practice.

As above, specific parts of the content of the present invention have been described in detail, and for those skilled in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereby. It will be clear.

Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents. Simple modifications or changes of the present invention can be easily used by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (12)

Including sand, synthetic polymers and hardeners,
The synthetic polymer includes epoxy resin, rubber, aliphatic diol and aluminum hydroxide,
The curing agent is a seismic reinforcement filler containing a polyamide resin, an aliphatic diol and aluminum hydroxide.
The filler for seismic reinforcement according to claim 1, which comprises 25 to 35 parts by weight of the synthetic polymer and 25 to 35 parts by weight of the curing agent based on 100 parts by weight of the sand.
The filler for seismic reinforcement according to claim 1, wherein the synthetic polymer contains the epoxy resin, rubber, aliphatic diol and aluminum hydroxide in a weight ratio of 2.5 to 3.5: 0.5 to 1.5: 0.5 to 1.5: 3.5 to 4.5. .
The filler for seismic reinforcement according to claim 1, wherein the curing agent comprises the polyamide resin, the aliphatic diol, and aluminum hydroxide in a weight ratio of 2.5 to 3.5: 0.5 to 1.5: 3.5 to 4.5.
The filler for seismic reinforcement according to claim 1, wherein the sand, the synthetic polymer and the curing agent are included in a weight ratio of 1:0.3:0.3.
The filler for seismic reinforcement according to claim 1, wherein the synthetic polymer includes the epoxy resin, rubber, aliphatic diol, and aluminum hydroxide in a weight ratio of 3:1:1:4.
The filler for seismic reinforcement according to claim 1, wherein the curing agent comprises the polyamide resin, the aliphatic diol, and aluminum hydroxide in a weight ratio of 3:1:4.
The method of claim 1, wherein the aliphatic diol is ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, 1,3-butylene glycol, polyethylene glycol, polypropylene glycol, dipropylene glycol, tripropylene glycol and tetraethylene glycol. Seismic reinforcement filler, characterized in that at least one selected from the group consisting of.
[Claim 2] The filler for seismic reinforcement according to claim 1, wherein the seismic reinforcement is seismic reinforcement for a stucco brick wall.
[Claim 10] The seismic reinforcing filling material according to claim 9, wherein the stucco brick wall is a stucco brick wall of an educational facility.
A stucco brick wall reinforced with earthquake-resistant fillers according to claims 1 to 10.
An educational facility having the stucco brick wall of claim 10.

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