KR20090096069A - Lightweight concrete panels using expanded polystyrene beads contained graphite - Google Patents

Abstract

A light concrete panel using a graphite foam polystyrene bead is provided to lighten a product by making the thickness of the panel thin and to improve the thermal conductivity and the thermal ability. A light concrete panel using a graphite foam polystyrene bead manufacturing method comprises: a step preparing the mixture mixed with bottom ash, cement and expanded polystyrene beads; a step of injecting the mixture into a mold; a step of curing the mixture injected in the mold frame; a step of separating the mixture from the mold; a step of curing the mixture separated from the mold; and a step of assembling the mixture and separated mold after cleaning.

Description

Lightweight concrete panels using expanded polystyrene beads contained graphite}

1 is a cross-sectional view of a conventional lightweight concrete panel.

Figure 2a and Figure 2b is a block diagram of a cross-sectional state of a lightweight concrete panel using a conventional expanded polystyrene bead and a method of manufacturing the same.

Figure 3 is a block diagram of a method of manufacturing a lightweight concrete panel according to the present invention.

Figure 4 is a perspective view of an embodiment of the mold used in the production of lightweight concrete panels according to the present invention.

5 is a particle size curve of the bottom ash used in the production of lightweight concrete panels according to the present invention.

Figure 6 is a cross-sectional view of the lightweight concrete panel according to the present invention.

Figure 7a is a photograph of a lightweight concrete panel mixed with conventional expanded polystyrene beads.

7b is a photograph of a lightweight concrete panel mixed with expanded polystyrene beads impregnated with graphite according to the present invention.

Figure 8a is a horizontal cross-sectional view according to the fire resistance test method of the building member.

8b is an elevation view of a temperature measurement position according to a fire resistance test method for a building member.

8c is a vertical sectional view according to the fire resistance test method of the building member.

8D is the legend of FIGS. 8A-8D.

Figure 9a is a pre-heat state photograph of the test body for the flame retardant experiment of the present invention.

Figure 9b is a state photograph after the heating of the test specimen for flame retardant experiment of the present invention.

Figure 10a is a graph of the rear surface average rise temperature of the 75mm panel during the heat shield experiment of the present invention.

Figure 10b is a graph of the maximum temperature rise on the back surface of the 75mm panel of the thermal insulation experiment of the present invention.

Figure 11a is a graph of the rear surface average rise temperature of the 90mm panel of the thermal insulation experiment of the present invention.

FIG. 11B is a graph showing the maximum rising temperature of the back surface of the 90 mm panel during the thermal insulation experiment of the present invention. FIG.

Explanation of symbols on the main parts of the drawings

21: Mixture 22: Wire Mesh Wire Mesh

23: fitting protrusion 24: fitting groove

The present invention relates to a lightweight concrete panel using graphite foam polystyrene beads with improved thermal insulation and fire resistance and a method for manufacturing the same. More specifically, by using expanded polystyrene beads containing graphite in a lightweight concrete panel, the color of the panel may be different. The present invention relates to a light-weight concrete panel using graphite foam polystyrene beads having improved heat insulation and fire resistance, which has a similar gray composition, lowers thermal conductivity, and has a relatively small thickness of fire resistance.

In the wall structure of the apartment, the boundary wall under load is composed of concrete. Therefore, the dismantling or moving of the boundary wall under the load on the upper part will seriously affect the whole structure. Therefore, there is no wall variability, so you can't change the wall freely when your family size decreases or increases, or when you want to remodel some rooms.

However, in multi-family houses or buildings with steel structures or ramen structures, columns are constructed to form each floor, and then boundary walls are constructed between the columns. Therefore, it is possible to construct the boundary wall in any position, so that the buyer can freely change it to the desired plane, and if the maintenance for the regular building is carried out, a long life house is possible.

The boundary wall between generations is constructed by a wet method or a dry method. Among them, the wet method is a method using bricks or blocks, which are gradually being used due to lack of functional manpower, and the dry method is a method in which partitions using gypsum board are frequently used.

Gypsum board walls are light and easy to install, but the disadvantages are the lack of sound insulation performance, hard to nail, damage to shocks such as punching, but also has a problem that the sound of impact can be heard well in the next generation.

Recently, lightweight concrete panels that compensate for the shortcomings of wet and dry walls have been used. Lightweight concrete panels are lighter than ordinary concrete, making them easier to install than wet with bricks.

In addition, the size is also cut to fit the height of the generation, so there is an effect to reduce the number of installation, the situation is a lot of lightweight concrete panels are recently used in steel frame or ramen.

Korean Industrial Standard (KS F 4736) has standardized extrusion lightweight concrete panels. In the standard, cement, lightweight aggregate, sand, admixture, water, etc. are specified as materials, width is 600mm, thickness is 75, 100mm. In order to manufacture lightweight concrete panels, lightweight aggregates are used in addition to cement or sand.

As shown in FIG. 1, the conventional lightweight concrete panel has a plurality of hollow parts 3 formed at the center thereof, and sand and cement 1 and light aggregate 2 are mixed between the outer part and the hollow part. have.

'A', which uses lightweight aggregates, uses imported aggregates. The reason is that the lightweight aggregate produced in Korea has low compressive strength, and thus the aggregate is broken during the injection molding process for manufacturing the panel.

Therefore, there is a disadvantage that the price of the product is expensive because of manufacturing the product by using the imported lightweight aggregate, and it takes time to introduce the aggregate, there is a problem in the production schedule and supply schedule.

Another lightweight concrete panel is a product using a cement board as shown in Figure 2a. This product is 70% lighter than the existing lightweight concrete as shown in FIG. 1 and has less damage to the surface, so it is frequently used as a wall of an apartment house.

This product is called Expanded polystyrene light-weight concrete composit panel, which is made of cement board with the thickness of 3.2mm or 4.5mm, and the water and fluidized material are mixed with cement and polystyrene in between. It is cured by putting lightweight concrete.

As shown in Figure 2a is a lightweight concrete panel using a cement board is foamed polystyrene mixed foam concrete (2a) is built in the inside, the cement board (1a) is attached to both outer surfaces.

As shown in Figure 2b is a method of manufacturing a lightweight concrete panel using a cement board, water, cement, expanded polystyrene particles and water reducing agent is injected into the mixer and mixed, and the mixture is poured into the mold to primarily room curing. Here the cement board is inserted into the inner surface of the frame.

In addition, the cured product is separated from the mold, and then the mold is cleaned and assembled, and then the cement board is inserted into the inner surface again.

Cement board has high tensile and compressive strengths and high water resistance, so there is no problem with surface material. Therefore, the filling material does not have a high compressive strength inside. The filler is a mixture of cement and polystyrene particles as described above.

However, the foamed polystyrene beads used in mixing with the cement mixture for the production of conventional lightweight concrete has a problem in that the color is noticeable when mixed with gray concrete and visually rejected.

In addition, there is a disadvantage that the price of the product is expensive because the imported cement board is used, and it takes time for the introduction of the cement board, there is a problem in the production schedule and supply schedule.

Existing KS F 4734 (foamed polystyrene lightweight concrete composite panel) is a panel prescribed to be made by using polystyrene beads and cement mixture as the main raw material in the center and joining fiber reinforced cement board to the surface. Until now, such composite panels were mixed with gray concrete using white foamed polystyrene beads, resulting in visibly rejected colors.

In order to solve the visual rejection caused by the difference in color, foamed polystyrene beads coated with a gray surface may be used, but the coating layer on the surface is peeled off during mixing with the cement mixture. Therefore, the original white was exposed and the visual rejection due to the color difference could not be solved.

Conventional expanded polystyrene lightweight concrete composite panel has a problem that it is difficult to use in places requiring high heat insulation performance because the thermal conductivity is higher than the ALC (Autoclave lightweight concrete) wall.

Another problem with conventional expanded polystyrene lightweight concrete composite panels is the minimum thickness problem for fire resistance. In general, when the refractory time is based on 2 hours, the conventional panel is 100 mm to satisfy the 2 hours standard. Therefore, it is difficult to make the wall thin in the area requiring fire resistance, there was a problem that the thickness of the panel unnecessarily thick.

Therefore, the present invention was developed in view of the above circumstances, and the color of the expanded polystyrene beads is similar to the color of the concrete, thereby eliminating the visual rejection due to the color difference, and the thermal conductivity is lower than that of the conventional expanded polystyrene lightweight concrete composite panel, resulting in thermal insulation performance. The present invention aims to provide a lightweight concrete panel using graphite foam polystyrene beads with improved heat insulation and fire resistance, which is thinner than the equivalent products due to the thinnest thickness of the panel that can withstand fire for 2 hours. .

In order to achieve the above object, the present invention provides a method for producing a lightweight concrete panel using graphite foam polystyrene beads having improved thermal insulation and fire resistance, and a mixture preparation step of mixing low ash and cement and expanded polystyrene beads, and injecting the prepared mixture into a mold. A mold injecting step, an indoor curing step for curing the mixture injected into the mold, a mold separation step for separating the indoor cured mixture from the mold, an outdoor curing step for curing the mixture separated from the mold, and a separation from the mixture It comprises a mold cleaning assembly step of cleaning and reassembling the mold, characterized in that the expanded polystyrene beads in the mixture preparation step is impregnated with a certain amount of graphite.

The expanded polystyrene bead has a size of 1-5mm, and provides a method for producing a lightweight concrete panel using graphite expanded polystyrene beads with improved insulation and fire resistance, characterized in that the polystyrene beads impregnated with graphite is foamed.

Another method of obtaining polystyrene beads containing graphite is to recycle the expanded polystyrene thermal insulation material impregnated with graphite. In this case, the expanded polystyrene bead has a size of 1-10 mm, and provides a method for manufacturing a lightweight concrete panel using graphite expanded polystyrene beads having improved thermal insulation and fire resistance, characterized in that the expanded polystyrene insulation is impregnated with graphite.

In the preparation of the mixture, cement and fly ash (fly ash) are added to water to make a paste, and then a high-performance sensitizer and EPS particles are added to the mixture, a low ash is added to the mixture, and a thickener is added to the mixture. 5-7%, Cement uses 8-11% by volume, Fly Ash uses 2-4% by volume, Water mixes 11-17% by volume, EPS particles by volume 65 It provides a method for producing a lightweight concrete panel using graphite foam polystyrene beads with improved insulation and fire resistance characterized in that -72% is mixed.

On the other hand, lightweight concrete panels using graphite foamed polystyrene beads with improved insulation and fire resistance are composed of the mixture 21, but the mixture is low ash with a volume ratio of 5-7% and 5 mm or less, cement with a volume ratio of 8-11%, and a volume ratio of 2-4%. In fly ash volume ratio of 11-17% of water, volume ratio of 65-72% of EPS particles are mixed, the EPS particles are impregnated with a certain amount of graphite, and the fitting protrusions 23 are formed on one side so as to be easily fitted together. The fitting groove 24 is characterized in that the groove is formed on the other side.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a method for manufacturing a lightweight concrete panel according to the present invention.

As shown in Figure 3, to explain the manufacturing method of the lightweight concrete panel using low ash according to the present invention, the first step is a mixture preparation step, the step of mixing the low ash and cement and expanded polystyrene beads.

In the preparation of the mixture, cement and fly ash are added to the water to make a paste, followed by mixing with a high-performance sensitizer and EPS particles, finally adding low ash and adding a thickener to make a mixture.

In the preparation of the mixture, the lower ash of 1.25-5mm or less uses 5-7% by volume, 8-11% by volume of cement, 2-4% by volume of fly ash, and 11-17% by volume of water. The foamed polystyrene beads (EPS) particles are mixed at a volume ratio of 65-72%.

Here, the expanded polystyrene beads (EPS) are impregnated with a certain amount of graphite. The method of impregnating expanded polystyrene beads with graphite and mixing them in a lightweight concrete panel includes direct foaming and mixing of polystyrene containing graphite, and grinding and mixing polystyrene products containing graphite.

The expanded polystyrene beads formed by foaming polystyrene impregnated with graphite of the first method are preferably circular 1-5 mm in size.

The reason for limiting the size of the beads in the foaming method is as follows. The size of foam depends on the size of the raw beads. As the size of the foamed particles increases, the surface area for the volume increases, which increases the separation phenomenon for the particles to rise. In other words, the specific gravity of the styropol grains is 0.01, and the specific gravity of the cement mixture is about 2.0, so the larger the particle size, the stronger the properties to rise. Therefore, it is intended to use the size of the smallest particles that can be supplied from the polystyrene raw material company impregnated with graphite.

The expanded polystyrene beads obtained by grinding the expanded polystyrene product impregnated with graphite of the second method are preferably 1-10 mm in size.

The reason for limiting the size of the beads in the grinding method is as follows. It is possible to pulverize a product made of graphite-impregnated beads (2 types of Styropol KS) or expanded polystyrene products used as a floor shock sound absorber. In the grinding process, fine particles of various particle sizes are generated, but particles having a large particle size (greater than 10 mm) may be deteriorated in strength. Therefore, it is recommended to use a size between 1-10mm. In the pulverization method, the shape of the particles is irregular by pulverizing the molded product, which is why it mixes well with the cement. However, when the particles are too large, only the styropol when mixed with the cement will be a factor that lowers the strength, thereby limiting the size of the particles constantly.

The reason for the constant volume ratio of beads in the panel is that as the use of beads increases, the specific gravity decreases and the strength decreases. As the use of beads decreases, the specific gravity increases and the strength increases. Thus beads of suitable volume ratio are mixed into the panel.

The present invention has a gray color to the inside of the bead, so that the color does not change even when mixing with the cement mixture, and even if the lightweight concrete panel is cut at any position, similar to the cement color, it is difficult to recognize whether the bead is mixed do.

The next step is a mold injection step of injecting the prepared mixture into the mold. In the mold injection step, the mixture may be injected into the mold while the wire mesh wire mesh is placed at the center of the mold to reinforce the bending rigidity.

The next step is the indoor curing step of curing the mixture injected into the mold, and the next step is the mold separation step of separating the indoor cured mixture from the mold.

Figure 4 is a perspective view showing an embodiment of the mold used in the production of lightweight concrete panels according to the present invention.

As shown in Figure 4 will be described with respect to the mold used in the present invention. In order to manufacture the unit panel (600 (width) * 2400-3500 (height) * 50-100 (thickness)) (unit: mm), a unit template is required. The basic configuration of the unit mold requires two side plates 11 and male and female edge frames 12 and 13. Several of these unit forms are assembled to form a combined form. The combined template is a solution for mass production.

The next step is the outdoor curing step of curing the mixture separated from the mold, and the next step is the mold cleaning assembly step of cleaning and reassembling the mold separated from the mixture.

Therefore, cement products loaded on the outside are cured (cured) secondly over time, and the separated lightweight cement panels are packaged in a certain number of products that pass the standard except for defective products through quality inspection process such as dimensional inspection. Load on.

The characteristics of the material to be used for the production of lightweight concrete panels are as follows.

The binders used in this experiment were plain Portland cement and fly ash. Fly Ash was used from Seocheon Thermal Power Co., Ltd. of Korea Midland Power Co., Ltd. The table below shows the chemical properties of the binder and the physical properties of the binder.

Table 1. Chemical Properties of Binders

division SIO2 AL2O3 FE2O3 CAO MGO NA2O K2O SO3 LOI CI (ppm) cement 20.7 6.2 3.2 63.6 2.2 0.11 0.81 1.91 - - Fly ash 49.5 29.9 4.7 0.6 0.6 0.0 3.8 0.1 9.0

Table 2. Physical Properties of Binders

Test Items Condensation time (Gillmore test) Compressive strength (kgf / ㎠) Stability Powder level (㎠ / g) importance First minute Termination (minutes) cement 259 639 28th 382 0.07 3304 3.15 Fly ash - - - - 1940 2.0

The aggregate used in this experiment is bottom ash, which is unrefined coal ash generated from domestic thermal power plants. 5 is a particle size curve of the bottom ash used in the production of lightweight concrete panels according to the present invention, Table 3 is the chemical properties of the bottom ash.

Table 3. Analysis of Chemical Composition of Coal Fly Ash

Sample Name SiO₂ Al₂O₃ Fe₂O₃ CaO MgO K₂O SO₃ TiO₂ Ig-loss Na₂O Bottom Ash (Unscreened) 47.7 25.1 5.7 0.6 0.7 3.3 0.1 1.4 15.3 0.0 Bottom Ash (Selection) 55.4 23.9 5.6 0.6 0.6 3.7 0.1 1.2 8.9 0.0

The properties (KS F 2526, 2527) compared with the low ash and general steel sand are shown in Table 4. Compared with steel sand, the general advantage is that the physical properties are similar, but the specific gravity is light, and the light weight concrete panel can be manufactured without the light aggregate.

Table 4. Comparison of Properties of Low Ash and Regular River Sand

Standard Item importance Water absorption Wear rate stability 0.08mm sieve passage Alkali aggregate reaction Low society 2.0 or less 8% less than 40% 10% Less than 1.0% Harmless River sand 2.5 or more 3% less than 40% 12% Less than 1.0% Harmless

In addition, particles having a size of 3-5 mm obtained by foaming polystyrene beads 30-50 times are used.

Example of compounding costs

In the present invention, cement was used as a binder, and an aggregate was used to develop a lightweight EPS concrete panel using bottom ash, which is a by-product of a thermal power plant, and lightweight EPS (Expanded Poly-Styrene).

The bottom ash, which is aggregate, was used for the bottom ash of 5mm or less through sieving test, and the fly ash was used as the filling material. The following experiments were conducted to understand the quality characteristics of concrete.

Table 5. Experimental Levels for Each Example

division W / B (%) Aggregate particle size (mm) Volume ratio (%) cement Bottom ash Fly ash water EPS Example 1 35 5 mm or less 9.48 5.59 2.39 12.29 70.25 Example 2 40 9.48 5.59 2.39 14.05 68.49 Example 3 45 9.48 5.59 2.39 15.81 66.73

Experiment method

The bibeam of lightweight EPS concrete used a ribbon mixer with a capacity of 250ℓ.The water was first added to rotate the mixer, and then cement and fly ash were added to make a paste state. After 60 minutes of mixing so as to mix well, the bottom ash was added, and finally a thickening agent was added to the beam.

In addition, considering the workability of lightweight EPS concrete, the high-performance water reducing agent was added below 1%, and the thickening agent for maintaining viscosity between paste and EPS was beamed at around 0.1%, so that the total beam time was set to 240 seconds. .

The specimens were prepared according to the KS method, and the specimens of lightweight EPS concrete were measured for surface finish and compressive strength of 7, 14 and 28 days after the specimens were cured under water at 20 ± 2 ℃.

The compressive strength test method was carried out in accordance with KS F 2408 "Concrete compressive strength test method" by preparing a φ 10 × 20 cm cylindrical specimen.

Experiment result

Light weight EPS concrete specimens showed higher compressive strength with lower water binder ratio, and the difference in strength expression according to age was insignificant. As a result of visual observation, the surface finish was superior as the water binder ratio was higher, and it was almost similar to Example 2 and Example 3.

Table 6. Results of Each Example

division Compressive strength (MPa) 7 days 14 days 28 days Example 1 5.8 6 6.1 Example 2 4.2 4.6 5.4 Example 3 3.8 3.9 4.0

Referring to the lightweight concrete panel using the low ash according to the present invention, as shown in Figure 6, the wire mesh wire mesh is located in the middle of the longitudinal direction to reinforce the bending rigidity, the fitting projections on one side so as to easily fit with each other while being formed on the other side The fitting groove is formed in the groove. 6 is a cross-sectional view of the lightweight concrete panel according to the present invention.

In addition, the lightweight concrete panel of the present invention consists of a mixture, but the mixture is 5% or less of volume ratio 5mm or less ash, volume ratio of 8-11% cement, volumetric ratio of fly ash volume of 11-4% of 2-4%, volume ratio It is mixed into EPS particles which are 65-72%. EPS particles are impregnated with a certain amount of graphite.

The physical difference between the existing 'foamed polystyrene lightweight concrete composite panel' and the lightweight concrete using the low ash of the present invention is as follows.

When comparing the physical properties between the lightweight concrete panel using the light weight aggregate and the product according to the present invention based on the 100mm product is as follows.

Table 7. Comparison of Conventional and Lightweight Concrete Panels of the Present Invention

Conventional lightweight concrete composite panel Lightweight concrete panel using graphite impregnated expanded polystyrene main ingredient Cement board, cement, general foamed polystyrene Low ash, cement, graphite impregnated expanded polystyrene Main use For interior walls Left importance About 0.8 Left Compressive strength (kgf / cm ² ) Exterior (Cement Board) More than 200 60 or more Interior (Lightweight Concrete) 30 or more Sound insulation performance (dB at 500Hz) 35 or more Left Fireproof performance More than 2 hours Left Bead color White grey Thermal Conductivity (W / mk) 0.32 0.25 Minimum thickness of 2 hours fire resistance (mm) 100 75

The lightweight cement composite panel using the existing cement board has a weak strength in the interior fillings. Therefore, it cannot be used for wall without using cement board on the outside. In order to increase the strength of the filler itself, it is necessary to partially add sand while reducing the amount of expanded polystyrene beads. At this time, the weight is greatly increased.

The present invention has a merit of lowering weight and increasing compressive strength by using low ash having a specific gravity as porosity. Therefore, it is possible to make lightweight concrete panels without using cement board, which is an expensive imported product.

The expanded polystyrene beads to be used are expanded polystyrene beads used as a raw material for a product containing graphite (two styropol KS) newly defined as two types in KS 3808-2005 (foamed polystyrene insulation). This product is greyed out inside the beads by graphite. The gray color makes it impossible to know whether the beads are present even when mixed with concrete. Therefore, it reduces the rejection of lightweight concrete products compared to the existing white expanded polystyrene beads.

Comparing FIG. 7A and FIG. 7B, the visual color difference of the expanded polystyrene beads can be clearly seen.

7A is a photograph of a lightweight concrete panel mixed with conventional foamed polystyrene beads. The white part, which is distinguished from other concrete parts, is a conventional expanded polystyrene bead.

Figure 7b is a photograph of a lightweight concrete panel mixed with graphite impregnated expanded polystyrene beads according to the present invention. The expanded polystyrene beads of the present invention are impregnated with graphite so that the expanded polystyrene beads and the concrete part are not visually distinguished.

The thermal conductivity is excellent compared to the lightweight concrete panels including the normal polystyrene beads (type Styropol KS) with white color, and the fire resistance against fire is excellent.

The thermal conductivity of the lightweight concrete product using the polystyrene beads of the present invention is 20% lower than the thermal conductivity of the product using the conventional beads. If the thermal conductivity is low, the heat insulating performance is excellent, so there is an effect of saving energy when used for the exterior wall of the apartment house.

To use as a non-structural wall in a high-rise building, it must satisfy the 2-hour fire resistance. In this case, when using the existing polystyrene beads, the minimum thickness should be at least 100mm. On the other hand, the lightweight concrete panel using the polystyrene beads of the present invention can satisfy the legal standard of fire resistance even with a thickness of 75mm. Therefore, the wall thickness of the panel of the present invention in consideration of the fire resistance only has an effect of reducing 25% than the wall thickness of the conventional panel.

When explaining the lightweight concrete panel using the existing polystyrene beads and the polystyrene beads of the present invention through the experimental value for the fire resistance performance as follows.

First of all, the legal standard, the following table 8 is the standard of fire resistance performance for general and residential facilities in the Ministry of Construction and Transportation Notice No. 2000-093 (Recognition and management standard of fireproof structure).

Configuration wall Beam pillar floor roof absence outer wall inside wall Size of Application Floor / Maximum Height (m) Bearing wall Non-bearing wall Bearing wall Non-bearing wall Concern about combustion Burning concern x Partition wall Shaft thread compartment wall 12/50 Excess 2 One 1/2 2 2 2 3 2 One Below 2 One 1/2 2 One One 2 2 1/2 4/20 or less One One 1/2 One One One One One 1/2

In Table 8 above, a two-hour fire resistance criterion is required for use as an internal wall as a non-bearing wall.

Looking at the results of evaluating the fire resistance performance of the lightweight EPS concrete panel of the present invention.

It is important to measure the fire resistance of the building and to ensure the fire resistance performance of the structural members. Therefore, it is necessary to examine the feasibility of meeting the requirements through fire resistance performance evaluation for the structural members. The experimental plan is to produce two kinds of lightweight EPS concrete panels (THK 75mm, 90mm) that are currently being tested in the factory. The fire resistance test (2 hours heating) was performed according to the test method, and the fire resistance performance was measured.

Figure 8a is a horizontal cross-sectional view according to the test method, Figure 8b is a temperature measurement position elevation according to the test method. 8C is a vertical cross-sectional view according to the test method, and FIG. 8D is a legend of FIGS. 8A to 8D.

* The test results for flame retardancy showed no openings and flames when the cotton pads were applied to the 75mm and 90mm panels. As shown in FIGS. 9A and 9B, flame generation did not occur in the portion of the back surface of flame generation, and thus, flame retardancy was satisfactory. Figure 9a shows the pre-heating state of the test body for the flame retardant test of the present invention, Figure 9b shows the post-heating state of the test body for the flame retardant test of the present invention.

Experimental results for the thermal insulation is the result of the back surface temperature of the test specimen for the measurement of the test specimen during the heating test is as shown in Figure 10a to 11b.

FIG. 10A is a graph showing the back surface average temperature rise of the 75 mm panel during the heat shielding experiment of the present invention, and FIG. 10B is the top surface temperature graph of the back surface of the 75 mm panel during the heat shielding experiment of the present invention.

FIG. 11A is a graph showing the rear surface average rise temperature of the 90 mm panel during the heat shield test of the present invention, and FIG.

10a to 11b briefly summarize the back average and the maximum rise temperature until the end of the test is shown in Table 9 below.

division 75mm panel 90 mm panel Back side average temperature 80 ℃ / 120 minutes 52 ° C / 120 minutes Maximum temperature 82 ° C / 120 minutes 66 ℃ / 120 minutes Fire resistance performance 2 hours pass 2 hours pass

As a result of the experiment, both 75mm and 90mm panels were found to satisfy the performance standard (2 hours of fire resistance performance) prescribed in KS F 2257, confirming the usability of the building as a partition material.

The following Table 10 is a table for the physical properties (based on the test report) of the existing (Acotech) extruded concrete panels.

unit 100T 75T Remarks weight kg / m ² 100 90 Heat transmission rate (K) W / m ² K 2.59 3.50 Water absorption % 15.9 14.8 KS standard: below 25 Compressive strength kgf / cm ² 123 123 KS standard: 100 or more (test specimen) Flexural strength kgf / cm ² 34 34 KS standard: 25 or more (test specimen) Fire resistance performance hour 2 - Sound insulation performance Hz 37.5 33 500 Hz

Through this Table 10, it can be seen that in the case of extruded concrete products using lightweight aggregate, the thickness of 100 mm is satisfied to satisfy the fire resistance standard for 2 hours.

While the invention has been described and illustrated in connection with a preferred embodiment for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

As described above, the lightweight concrete panel using graphite foam polystyrene beads having improved thermal insulation and fire resistance and a method of manufacturing the same have a color of expanded polystyrene beads similar to that of concrete, thereby eliminating visual rejection due to color difference. The thermal conductivity is lowered than the conventional expanded polystyrene lightweight concrete composite panel to improve the thermal insulation performance, and the minimum thickness of the panel that can withstand fire for two hours is thinner and lighter than the equivalent product, thereby saving energy.

By utilizing low ash in lightweight concrete panels, it is possible to recycle industrial by-products to conserve the environment and to replace low-weight aggregates and sands with low costs to secure low demand large-scale demands, product prices are low, material supply schedules and product production schedules. This can be smooth.

Claims (4)

After preparing a mixture for mixing low ash with cement and expanded polystyrene beads, and injecting the prepared mixture into the mold, curing the mixture injected into the mold in the mold, separating the cured mixture from the mold, and In the lightweight concrete panel made by curing the separated mixture separated, The expanded polystyrene beads included in the mixture are impregnated with graphite, so that the expanded polystyrene beads have the same color as or similar to those of the low ash and cement, which are different members, by using the expanded polystyrene beads having no white inside. Lightweight concrete panel using graphite foam polystyrene beads, characterized in that the foamed polystyrene eliminates the rejection caused by the color difference with other members when the cut at any position, and whether the mixed polystyrene beads are mixed. The method of claim 1 The graphite-impregnated polystyrene beads are directly foamed and mixed, or the polystyrene beads including abyss are ground and mixed, but the size is 1-10 mm, and the lightweight polystyrene beads are not mixed with graphite of the same size. By lowering the thermal conductivity compared to concrete panels, the thickness of the lightweight concrete panel cured by mixing the polystyrene beads impregnated with graphite is 50-100 mm, and the legal standard for fire resistance (fire resistance satisfies 2 hours in high-rise buildings). Lightweight concrete panel using graphite foam polystyrene beads, which satisfies the Ministry of Construction and Transportation Notice No. 2000-093: Table 8 in the specification). The method according to claim 2, The compressive strength indicating the compression resistance index of the cured mixture is 30-60 (kgf / cm 2), and the thermal conductivity indicating the thermal insulation index is 0.25-0.32 (W / mk). panel. The method according to claim 2, In the preparation of the mixture, cement and fly ash (fly ash) are added to water to make a paste, and then a high performance water-reducing agent and expanded polystyrene bead particles are added to the mixture, mixed with a low ash, and a thickener is added to form a mixture. In the preparation of the mixture, a low ash of 5 mm or less uses a volume ratio of 5-7%, a cement uses a volume ratio of 8-11%, a fly ash (fly ash) uses a volume ratio of 2-4%, and water uses a volume ratio of 11- Lightweight concrete panel using graphite foam polystyrene beads, characterized in that 17%, the expanded polystyrene bead particles are mixed by the volume ratio 65-72%.

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