KR100556259B1 - Extrusion Lightweight Concrete Panels Using Bottom Ash and its Production Method - Google Patents

Abstract

The present invention relates to an extruded lightweight concrete panel utilizing a low ash and a method for manufacturing the same, and by recycling the low ash generated at the power plant to be applied to the lightweight concrete panel, it is possible to replace the conventional high-strength lightweight aggregate and landfill waste at the same time. Its purpose is to improve the environment by recycling.

To this end, the present invention comprises the steps of preparing a slurry made by mixing the low ash with a specific gravity of 1.8-2.1 and cement and water (S100); and the extrusion step of injecting the slurry into an extruder (S200); and And a cutting step (S300) of cutting the panel to a predetermined size; and a curing step (S400) of curing the panel.

In the slurry preparation step, the low ash has a particle size of 0.01-10 mm, but the low ash having a particle size of 0.1-3 mm is 88-93% of the total low ash. We propose a method of manufacturing.

Low ash, extrusion, lightweight concrete, panel

Description

 Extrusion Lightweight Concrete Panels Using Bottom Ash and its Production Method}             

1 is a perspective view of a lightweight concrete panel using a conventional lightweight aggregate,

2 is a flowchart illustrating a method of manufacturing a lightweight concrete panel according to the present invention in order;

Figure 3 is a block diagram showing a step-by-step manufacturing method of a lightweight concrete panel utilizing low ash in the present invention

Figure 4 shows a specific example of the lightweight concrete panel according to the present invention.

Explanation of symbols on the main parts of the drawings

10: sand and cement 20: light weight aggregate

30: hollow part 40: low light weight concrete

50: outer portion 130: low injection container 140: mixer 150: extruder

160: cutting machine 110: water tank

120: between the cement 160: cutting machine

170: panel 180: stacked panel

190: indoor curing room 200: iron plate

210: natural curing 220: loaded iron plate

250: iron plate separation 260: packaged products

S100: Slurry (low ash + cement + water) preparation step

S200: Extrusion Step S300: Cutting Step

S400: Panel curing step

The present invention relates to an extruded lightweight concrete panel utilizing a low ash and a method for manufacturing the same, and more particularly, it is possible to replace the conventional lightweight aggregate having a low compressive strength by recycling the low ash generated at the power plant and applying it to the lightweight concrete panel. At the same time, the objective is to improve the environment by recycling landfill waste.

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. As a result, there is no variability of the wall, so you can't change the wall freely when you plant or shrink or stretch it, 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 it can be freely directed to the desired plane of the buyer. Therefore, long-term life is possible if only regular maintenance of buildings is provided. On the other hand, the boundary wall between generations of steel structure or ramen structure is constructed by wet method or dry method. The double wet method uses bricks or blocks, but the use of bricks and blocks is gradually decreasing due to lack of manpower. As a dry method, 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, and easily damaged by impacts such as punching, but also has a problem that the impact sound is 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. 1 is a cross-sectional view of a lightweight concrete panel, the hollow portion (3) is formed in the center and the sand and lightweight aggregate and cement are mixed between the outer portion and the hollow portion. Lightweight aggregates are defined by KS as fine aggregates, coarse aggregates, artificial lightweight aggregates such as expanded shale, expanded clay, plastic fry ash, vermiculite, and pearlite for the purpose of lightening the product. In many cases, lightweight aggregates have low compressive strength, so the aggregates are broken during the injection molding process to manufacture the panel. Therefore, high-strength lightweight aggregates are used.

On the other hand, coal-fired power plants using coal anthracite produce coal ash after burning coal. Fly ash is a fine-sized particle that is filtered by the filter while passing through the combustion furnace with the combustion gas. The low ash is formed by solidification of particles by sintering in the combustion furnace. It is ground to a particle size of 25 mm or less.

Fly ash makes up 70-90% of coal ash, but the majority of fly ash produced is used as a cement admixture and many applications are being developed. However, low ash, which accounts for 10-30% of coal ash, has been used up to now and has been completely reclaimed by building a breakwater around the power plant. However, due to the low circuit of hundreds of thousands of tons generated every year, the shortage of landfill is becoming serious, causing problems such as environmental damage caused by scattering dust around the landfill. However, as a product that utilizes low ash, there is a lake block (especial 2003-0034648). However, the banks of lakes are built on rivers, lakes, waterways, etc., and they are installed to prevent the loss of banks due to waves and flow rates. In addition, there is a technique for using low ash, which is a general waste generated in coal-fired power plants, in concrete compositions (Special 2003-0064572), but in the concrete composition, bottom ash fine aggregate 20-40 weight, which is a waste generated in thermal power plants, as a substitute for sand. %, Concrete is composed of 30-50% by weight of natural coarse aggregates as gravel, which is not only suitable as a material of lightweight concrete, but also as a material for extruding panels. On the other hand, if you look for an example of using low ash as a lightweight concrete material, Japanese Patent Laid-Open No. H11-269849 uses low ash and low ash to replace lightweight concrete in order to apply raft blocks in soft ground. Although a lightweight material is proposed, there are many problems in applying it to an extruded molded panel due to its low compressive strength. In addition, there are many examples in which ash discharged from power plants is used as a substitute for lightweight concrete, but in most cases, ash is used. Accordingly, it is necessary to develop alternative materials for lightweight concrete using low ash and to develop various molded products.

Therefore, the present invention was developed in view of the above circumstances, and utilizes low ash in a conventional lightweight concrete panel to recycle the waste to conserve the environment, and to replace the lightweight aggregate and sand, and extruded lightweight concrete panel and its manufacturing method Its purpose is to secure large, low-demand customers.

In addition, the extrusion molding lightweight concrete panel utilizing the low ash according to the present invention is to secure the compressive strength for extrusion molding and to replace the conventional high-strength lightweight aggregate and sand to reduce the manufacturing cost of lightweight concrete panels.

In addition, the present invention is intended to provide an efficient manufacturing process can be used without changing the conventional extrusion molding equipment by replacing only lightweight aggregate and sand in the manufacture of extrusion molded lightweight concrete panel.

In the present invention for achieving the above object, the step of preparing a slurry made by mixing the low ash with a specific gravity of 1.8-2.1 and cement and water (S100); and the slurry is injected into the extruder and extruded in the state of the panel And a cutting step (S300) of cutting the panel to a predetermined size; and a curing step (S400) of curing the panel.

In the slurry preparation step, the low ash has a particle size of 0.01-10 mm, but the low ash having a particle size of 0.1-3 mm is 88-93% of the total low ash. It provides a method of manufacturing.

In addition, in the present invention, a slurry prepared by mixing low ash with cement and water, but the low ash has a particle size of 0.01-10 mm and a low ash having a particle size of 0.1-3 mm is 88-93% by weight ratio of the total low ash. A slurry preparation step of mixing the low weight mixing ratio of cement to 1 to 3 to 1 5 and mixing the weight mixing ratio of water to cement of 1 to 0.5 to 1 to 0.7; and the slurry is injected into an extruder. And extruding the panel to a predetermined size; and cutting the panel to a predetermined size; and curing step of curing the panel. to provide.

In addition, in the slurry preparation step of the present invention provides a method for producing compression molded lightweight concrete panel utilizing low ash, characterized in that the mixed foamed polystyrene beads of 1-3mm in the range of 15-20% of the slurry volume.

In addition, in the present invention, the circular portion or polygonal hollow portion 30 is formed in the center of 4 to 10, and the hollow portion and the outer portion 50 is filled with low-weight concrete made of low ash and cement 40 The low ash is a particle size of 0.1-3mm to be 88-93% by weight ratio of the total low ash, the low ash weight mixing ratio of the cement is 1 to 3 to 1 to 5, the weight of the water mixing ratio of cement is 1 It provides a compression molded lightweight concrete panel utilizing low ash, characterized in that 0.5 to 1 to 0.7.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Table 1 shows the granularity according to the low particle size discharged from the thermal power plant or landfilled in the landfill.

Table 1 Comparison of particle size composition according to the weight ratio of low ash and steel sand

Particle size (mm) 0.1 or less 0.1-0.5 0.5-1 1-3 3-10 over 10 Composition to Weight (%) Low society Less than 5 8-13 25-35 35-45 7-12 Less than 5 River sand Less than 5 25-45 25-45 10-20 3-7 Less than 3

The particle size configuration is the result of the sifting test by KS F 2502. Compared to ordinary steel sand, it is slightly thicker or about the same size.

In addition, Table 2 summarizes the properties (KS F 2526, 2527) compared to the low ash and ordinary sand. 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.

Standard Item importance Water absorption Wear rate stability 0.08mm sieve passage Alkali aggregate reaction Low society 2.1 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

Table 2 Comparison of Properties of Low Ash and River Sand

The manufacturing process of the present invention will now be described. Figure 2 shows a manufacturing process according to the invention and Figure 3 shows a step by step manufacturing method according to the invention. First, the slurry preparation step (S100) in the mixer 140 to prepare a slurry by mixing the water discharged from the water tank 110, between the cement 120, the low ash feed container 130 and cement and low ash ash. In addition, as shown in Table 2, the low ash has a specific gravity of 2.1 or less, but when it is necessary to further lower the specific gravity of the lightweight concrete material, the coated polystyrene beads having a diameter of 1-3 mm in the slurry as a mixed material It is desirable to adjust the specific gravity by mixing within 20%. The low ash is a main component of silicon oxide (SiO ₂ ) or aluminum oxide (Al ₂ O ₃ ) and when mixing the calcite raw material such as cement can also secure the effect of increasing the strength by the pozzoran reaction. Although the cement according to the present invention is not particularly limited, conventional portland cement, crude steel portland cement, medium heat portland cement, sulfuric acid portland cement, white portland cement, alumina cement, furnace cement and the like can be used.

In the present invention, as described above, when preparing the slurry, the specific gravity of the low ash is preferably 1.8-2.1, which is considered in consideration of the specific gravity of the panel of lightweight concrete. It is possible to mix the coated expanded polystyrene beads in the range of 15-20% of the slurry volume or to apply the hollow as described below.

Meanwhile, the amount of water added to the mixer is to be less than 18% of the total weight. As the amount of water to be mixed becomes smaller, the viscosity of the slurry becomes higher, thereby ensuring high strength during extrusion of the extruder. The mixer 140 does not require a special method, but is preferably a mixer for wet mixing, which is omitted in detail because it is well known in the art.

When the slurry preparation is completed, the slurry is injected into the extruder 150 and extruded in the state of the panel 170. This is the extrusion step (S200) when the slurry discharged from the mixer is injected into the extruder die (not shown) in the extruder to pressurize the slurry and the outlet portion of the extruder has the same shape as the cross section of the panel to form a panel. The extruder is divided into a method of extruding by self weight and a method of extruding by extrusion die. In order to extrude by self weight, it is necessary to maintain the viscosity of mixed slurry properly. That is, the lower the viscosity is advantageous to be discharged from the outlet of the extruder by its own weight, but the higher the viscosity is advantageous to maintain the form of the panel after discharge, so appropriate viscosity is required. However, in the present invention, a method of extruding with a die which is a method of forcibly pushing out is preferable. In this case, not only the shape can be maintained even after extrusion but also there is an advantage that a high-strength panel can be manufactured. In addition, vibration can be applied to the extruder to reduce voids.

On the other hand, the bottom of the extruder is provided with a separating iron plate for forming a panel, the panel is mounted on the separating iron plate (220). The panel is then cut by the cutter 160 in accordance with the specifications before curing. Once the panel 170 has undergone the cutting step (S300), defective products are removed and only suitable products are loaded (180). The stacked panel is moved 240 for curing, and the panel is separated from the iron plate 200 and the pedestal 250 via an indoor curing 190 which is cured indoors. The panel is naturally cured 210 again at the yard in the state of the packaged product 260 and then shipped to the product. Meanwhile, the separated iron plate and the pedestal are moved to the extruder 220 so that the slurry is filled.

Table 3 compares the physical properties between the lightweight concrete panels and the products according to the present invention. KS F 4736 defines the quality standards for lightweight concrete panels, and the light concrete panels utilizing the low ash according to the present invention become products that meet or exceed the above quality standards.

Table 3 Comparison of Properties of Lightweight Concrete Panels Using Lightweight Concrete Panels

Lightweight concrete panel with lightweight aggregate KS F 4736 Lightweight concrete panel using low ash main ingredient Lightweight aggregate, cement, sand Low ash, cement Main use Interior and exterior wall, soundproof wall Left importance 1.6 or less Left Compressive strength (kgf / cm ² ) More than 100 Left Sound insulation performance (dB at 500Hz) 33 or more Left Fire resistance performance More than 2 hours Left

Hereinafter, as a specific embodiment of the present invention, the low particle size and weight ratio and the specific weight ratio of cement are described. In one embodiment of the present invention, the low ash having a particle size of 0.1-3mm is 88-93% of the total low ash and the low ash having a particle size of 0.01-10mm is used as the main raw material. As can be seen from the weight ratio, the bottom ash having a size of 0.1-3 mm is made to be 85% by weight of the total bottom ash. Also the bottom ash over 10mm is filtered out.

In addition, in one embodiment according to the present invention, the low-weight mixing ratio of cement is 1 to 3 to 1 to 5, and the weight mixing ratio of water to cement is mixed to 1 to 0.5 to 1 to 0.7 to produce a lightweight concrete panel. do. The low weight blending ratio for the cement ranges from the weight blending ratio of the sand to the widely used cement, and the ratio is suitable considering the strength even in the lightweight concrete panel according to the present invention. In addition, the weight mixing ratio of water to cement was limited to 1 to 0.5 to 1 to 0.7, which is a mixing ratio in consideration of the appropriate viscosity when extruding the slurry as described above, and when cement to low ash is 1: 3, the ratio of water to cement is The ratio of water to cement is 0.5 to 1, and the ratio of cement to water is 1 to 0.7.

The following describes a shaped panel. In order to satisfy the specific gravity value specified in KS F 4736, while reducing the weight of the product, the lightweight concrete panel allows the pipe to pass through the inside of the panel. Have a dog. The thickness is to be 75, 100 mm in accordance with KS F 4736. That is, the hollow portion 30 and the outer portion 50 of the panel is made of low-light concrete. Using the manufacturing method as described above to produce a lightweight concrete panel utilizing low ash, the low ash is 0.1-3mm grain size of 85% or more under the weight ratio of the total low ash, low-weight mixing ratio of cement 1 The ratio is 3 to 1 to 5, and the weight ratio of water to cement is 1 to 0.5 to 1 to 0.7.

Until now, the specific configuration of the lightweight concrete panel using the low ash according to the present invention and its manufacturing method is to replace the low-circuit sand and lightweight aggregate instead of the reason that the conventional product should use lightweight aggregate to reduce the weight of the product. The challenge is to reduce weight and save resources. In other words, existing lightweight concrete panels are raw materials of high specific gravity sand (greater than 2.6 specific gravity) and cement (specific gravity 3.1 or higher). Needed. In the present invention, the raw material is low ash, which is lower than 2.1, which has its own specific gravity, which is an advantage compared to conventional lightweight aggregates, and exhibits the effect of replacing sand and lightweight aggregates in terms of particle size similar to sand.

In the detailed description of the present invention described above, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

The lightweight concrete panels will continue to increase as the ramen structure is built in the future, so low ash will be consumed in large quantities when mass production of lightweight concrete panels utilizing the low ash according to the present invention. Therefore, the present invention solves the problem caused by the low-filled landfill to provide the effect of eliminating the low-filled landfill shortage, and can replace the expensive lightweight aggregate provides a lightweight concrete panel at low cost.                     

In addition, the lightweight concrete panel according to the present invention also reduces the use of existing sand, thereby providing an effect of reducing the lack of aggregate.

Claims (5)

Preparing a slurry made by mixing the low ash with a specific gravity of 1.8-2.1 and cement and water (S100); and the extrusion step of injecting the slurry into an extruder (S200); and the panel is a predetermined It is manufactured including a cutting step (S300) to be cut to size; and curing step (S400) that the panel is cured, In the slurry preparation step, the low ash has a particle size of 0.01-10 mm, but the low ash having a particle size of 0.1-3 mm is 88-93% of the total low ash. Manufacturing Method delete According to claim 1, wherein the slurry preparation step is a low weight mixing ratio of cement to 1 to 3 to 1 to 5, the weight mixing ratio of water to cement is characterized in that the mixture of 1 to 0.5 to 1 to 0.7 Manufacturing Method of Compression Molded Lightweight Concrete Panel Using Low Ash According to claim 1 or claim 3, wherein in the slurry preparation step, the compacted lightweight concrete panel utilizing low ash, characterized in that mixing 1-3mm coated expanded polystyrene beads in the range of 15-20% of the slurry volume. Manufacturing Method Four to ten circular or polygonal hollow portions 30 are formed in the center portion, and the hollow portion and the outer portion 50 are filled with low-weight concrete 40 made of low ash and cement, but the low ash is 0.1 The particle size of -3mm should be 88-93% of the total low weight ratio, but the low weight weight ratio of cement is 1 to 3 to 1 to 5, and the weight ratio of water to cement is 1 to 0.5 to 1 Compression molding lightweight concrete panel utilizing low ash, characterized in that 0.7

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