KR20060067803A - Light-weight panel with high strength for access floor and preparation thereof - Google Patents

Abstract

The present invention as part of the production of high-strength and lightweight cement concrete composites for weight reduction and strength of the inorganic double floor panel used in the existing offices and computer rooms, cement including light aggregate and polyvinyl alcohol (PVA: polyvinylalcohol) fiber The present invention relates to a high-strength lightweight panel for double flooring having excellent physical properties and a method of manufacturing the same.

The high-strength lightweight panel for double-floor of the present invention is formed by mixing PVA, silica fume, polycarboxylic acid-based fluidizing agent, general cement, and light weight aggregate in a slurry state, and inserting a mesh during molding or galvanizing after molding. Bond the steel plate to reinforce the strength.

Double flooring, light weight, high strength, light weight aggregate, mesh, galvanized steel sheet

Description

Light-weight panel with high strength for access floor and preparation

1 is a detailed view of a high-strength lightweight panel for a double floor according to an embodiment of the present invention.

FIG. 2 is a detailed view of a mesh installed for reinforcement in the panel of FIG. 1. FIG.

3 is a longitudinal cross-sectional view of FIG. 1.

4 is a detailed view of a high-strength lightweight panel for a double floor according to another embodiment of the present invention.

5 is a longitudinal cross-sectional view of FIG. 4.

6 is a detailed view of a high strength lightweight panel for double floor according to another embodiment of the present invention.

7 is a longitudinal cross-sectional view of FIG. 6.

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

10: core panel

11: lightweight aggregate

20: mesh

30, 31: galvanized steel sheet

The present invention relates to the manufacture of panels for double floor (access floor) used in high-end buildings, office buildings, high-tech equipment holding buildings, and more specifically, using lightweight aggregate and polyvinyl alcohol, cement, silica fume, poly The present invention relates to a high-strength lightweight panel for a double floor material and a method for manufacturing the same, which are manufactured by mixing a suitable amount of a carboxylic acid-based fluidizing agent.

Commonly used double floor panels are usually manufactured using inorganic materials, steel, wood and the like. Among them, the double floor panel made of inorganic material can maintain sufficient strength, but because of its high weight, a lot of load is placed on the whole building. In addition, when the fiber used in fiber reinforced cement concrete, which is widely used as an inorganic material, is glass fiber, corrosion of the fiber itself is caused by alkali's inherent alkalinity, and asbestos fiber is used because of its small impact strength and human body's harmfulness to asbestos itself. This is not easy. In addition, polypropylene fiber has a problem in strength enhancement due to lack of elastic modulus and dispersibility, carbon fiber has a disadvantage of being expensive.

The present invention is to solve the drawbacks of the conventional double-floor, the object of the present invention is to use a lightweight aggregate having a low specific gravity to induce first weight reduction, and secondly polyvinyl alcohol fiber to improve strength and mechanical performance Using a reinforcing fiber, polycarboxylic acid-based fluidizing agent, silica fume, and third, using a reinforcing mesh or galvanized steel sheet for the reinforcement of the maximum breaking load, a lightweight, high-strength reliable double-floor panel and its manufacture To provide a way.

In order to achieve the above object, the present invention provides a high-strength lightweight panel for a double-floor made of a composite composition comprising a mixture of 1 to 80% by weight of the lightweight aggregate and 0.1 to 1% by weight of reinforcing fibers during manufacture.

Preferably, the high-strength lightweight panel of the present invention is 30 to 70% by weight cement, 30 to 60% by weight lightweight aggregate, 0.2 to 0.5% by weight reinforcing fiber, 0.5 to 1% by weight of polycarboxylic acid-based fluidizing agent, silica fume 1 to 5 Weight percent, 5 to 10 weight percent water.

In the case of light weight aggregates, more than 80% by weight of the basic experiments showed that the strength expression effect is almost insignificant. In the case of cement, when used in excess of 70% by weight, it is difficult to secure the original light weight and workability also decreases.

In the case of reinforcing fibers and silica fume, when used in excess of 0.5% by weight and 5% by weight, the workability is not good, and a lot of voids are generated in the panel thus produced, resulting in a decrease in panel strength.

In the case of the polycarboxylic acid-based fluidizing agent, the use of more than 1% by weight did not help in the strength development. In the case of water, a decrease in strength was observed when used in excess of 10% by weight.

In addition, when reinforcing fibers such as polyvinyl alcohol fiber and nylon fiber are blended, it is effective for tensile strength, long-term stability, and crack prevention of panels. Silica fume is made of particles smaller than the particles of cement. Effective for promotion

Compared to lignin-based fluidizing agents such as methyl cellulose, polycarboxylic acid-based fluidizing agents have improved strength due to high water-resistance rate, shorten the process by securing initial strength, reduce casting time and personnel by securing fluidity, and prevent waste by maintaining fluidity. In addition, it has many advantages, such as suppressing cracking of structures due to securing early strength.

More preferably, the high-strength lightweight panel of the present invention is 40 to 45% by weight cement, 42 to 47% by weight lightweight aggregate, 0.3 to 0.4% by weight reinforcing fiber, 0.8 to 1.0% by weight polycarboxylic acid-based fluidizing agent, silica fume 2 to 3% by weight and 8-9% by weight of water.

In the case of reinforcing fibers, agglomeration between fibers occurred when using more than 0.4% by weight, resulting in a decrease in strength. In the case of the polycarboxylic acid-based fluidizing agent, it was possible to minimize the amount of water used within the above range, thereby confirming the effect on the strength development.

Light weight aggregate used in the present invention, in order to reduce the weight of the panel, it is preferable to use a natural or artificial aggregate having a specific gravity of 1.5 or less, preferably 0.5 to 1.0, more preferably about 0.7 low specific gravity.

The reinforcing fiber usable in the present invention is at least one selected from polyvinyl alcohol fiber, nylon fiber, glass fiber, asbestos fiber, polypropylene fiber, carbon fiber, metal fiber, polyester fiber, aramid fiber, polyethylene fiber, Among them, preferred reinforcing fibers are polyvinyl alcohol fibers which are well dispersed.

In the high strength lightweight panel for double floor materials of the present invention, in order to reinforce the maximum breaking load and the strength thereof, it is preferable that a steel mesh is installed inside the panel, or a galvanized steel sheet is attached to the upper and lower parts or the entire exterior of the panel.

When the steel mesh is installed in the lightweight panel according to an embodiment of the present invention, when the size of the panel is 500 mm × 500 mm × 21 mm to 600 mm × 600 mm × 30 mm, the weight is 9.27 to 19 kg, maximum Breaking load is 1,163-1,615 kgf.

When the galvanized steel sheet is bonded to the lightweight panel according to another embodiment of the present invention, when the size of the panel is 500mm x 500mm x 21mm to 600mm x 600mm x 30mm, the weight is 10 to 19.5 kg, Maximum breaking load is 1,225-1,500 kgf.

As described above, the high strength and light weight panel of the present invention can achieve high strength and light weight.

Lightweight panel of the present invention is made of a single layer structure is easy to manufacture and can achieve light weight and high strength.

In addition, the present invention is a) 30 to 70% by weight cement, 30 to 60% by weight lightweight aggregate, 0.2 to 0.5% by weight reinforcing fiber, 0.5 to 1% by weight polycarboxylic acid-based fluidizing agent, 1 to 5% by weight silica fume, water Mixing 5 to 10% by weight to make a slurry; b) firstly injecting and flattening the slurry into the mold; c) installing a reinforcing steel mesh on the slurry injected into the mold; d) secondary injection of the slurry to cover the mesh and to finish the surface through a planarization operation; e) It provides a method of manufacturing a high strength lightweight panel for a double floor comprising a curing step.

Method for producing a high-strength lightweight panel for a double floor according to another embodiment of the present invention is a) cement 30 to 70% by weight, lightweight aggregate 30 to 60% by weight, reinforcing fiber 0.2 to 0.5% by weight, polycarboxylic acid-based fluidizing agent 0.5 to Mixing 1% by weight, 1-5% by weight of silica fume and 5-10% by weight of water to make a slurry; b) injecting the slurry into the mold and curing after finishing the surface through a planarization operation; c) adhering the galvanized steel sheet to the upper and lower parts or the entire outer surface of the cured panel.

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

1 is a detailed view of a high-strength lightweight panel for a double-floor according to an embodiment of the present invention, Figure 2 is a detailed view of the mesh is installed for reinforcement, Figure 3 is a longitudinal sectional view of the panel.

As shown in FIG. 3, the panel according to this embodiment has a low specific gravity and lightweight aggregate 11 uniformly dispersed in the core panel 10 to achieve weight reduction, and also with polyvinyl alcohol or nylon fibers. The same reinforcing fibers are uniformly dispersed in the panel 10 and a polycarboxylic acid-based fluidizing agent and silica fume may be added to reinforce the strength and improve the mechanical performance, and preferably the steel mesh 20 having the shape of FIG. 2. ) Can be inserted inside to reinforce the maximum breaking load and strength.

4 is a detailed view of a high strength lightweight panel for double floor according to another embodiment of the present invention, Figure 5 is a longitudinal cross-sectional view of the panel 4.

The panel according to this embodiment is an encapsulation type that reinforces the strength by surrounding the entire outer surface of the core panel 10 with galvanized iron sheets 30 and 31 as shown in FIG. 5. At this time, the lower plate 31 of the galvanized steel sheet covers the side of the core panel 10, and finishes by folding the ends of the upper and lower plates 30 and 31 in engagement with each other at the upper end of the side.

6 is a detailed view of a high-strength lightweight panel for double floor according to another embodiment of the present invention, Figure 7 is a longitudinal cross-sectional view of the panel of FIG.

As shown in FIG. 7, the panel according to this embodiment is a type of reinforcing strength by adhering the galvanized steel sheets 30 and 31 to the upper and lower portions of the core panel 10.

The high-strength lightweight panel for double-floor of the present invention is a mixture of lightweight aggregate, polyvinyl alcohol fiber or nylon fiber, polycarboxylic acid-based fluidizing agent, silica fume, and water in the cement as the main material, and then the fibers and aggregates in the cement matrix evenly Homogeneous, fiber-reinforced cement-concrete composites prepared with sufficient mixing time to be dispersed.

Example 1

a. Slurry Formulation

Each material was put into a mixer according to the composition ratio of Table 1 and mixed to make a slurry.

ingredient Content (% by weight) Plain cement 4232.87 (42.2 wt.%) Lightweight aggregate (specific gravity 0.5 to 1.0) 4500.69 (44.87 weight%) Polyvinyl alcohol fiber 37.11 (0.37 wt.%) Polycarboxylic Acid Fluidizing Agent 89.27 (0.89 weight%) Silica fume 270.82 (2.7 wt%) water 899.74 (8.97 wt.%) system 10030.5 (100% by weight)

b. Primary injection of slurry

After mixing, the slurry was poured into a mold (500 mm x 500 mm x 25 mm, 500 mm x 500 mm x 21 mm, 600 mm x 600 mm x 30 mm, 600 mm x 600 mm x 25 mm), and a flattening operation was performed. .

c. Mesh installation for reinforcement

A steel mesh was installed on the slurry injected into the mold. The size of the mesh was set so that the periphery of the mesh could be located within 10 to 20 mm from each mold periphery.

d. Second injection of slurry

After the mesh was installed, the mixed slurry was injected into the mold to cover the mesh and to finish the surface by planarization. The total amount of slurry injected into the actual mold will depend on the panel specifications.

e. Curing

After mold molding, the mixture was left at room temperature for 1 day, then demolded from the mold, and the panel specimens were cured for 2 weeks in water at room temperature.

Example 2

a. Slurry Formulation

As in Example 1, according to the composition ratio of Table 1, each material was put into a mixer and mixed to make a slurry.

b. Injection of slurry

After mixing, the slurry was poured into a mold (500 mm × 500 mm × 25 mm, 500 mm × 500 mm × 21 mm, 600 mm × 600 mm × 30 mm, 600 mm × 600 mm × 25 mm) and a flattening operation was performed. .

c. Curing

After mold molding, the mixture was left at room temperature for 1 day, then demolded from the mold, and the panel specimens were cured for 2 weeks in water at room temperature.

d. Galvanized Steel Sheet Adhesion

Galvanized steel sheets (500mm × 500mm × 0.25mm, 600mm × 600mm × 0.25mm) are bonded to the upper and lower parts of 500mm × 500mm and 600mm × 600mm panels with epoxy adhesive, respectively. Cured for 1 day.

Comparative Example 1

Inorganic panel in which a steel mesh is inserted into the bottom of the composite panel of the sand, fiber, water mixed molding according to the composition ratio of Table 2 below.

Comparative Example 2

A panel in which a galvanized steel sheet was bonded to the upper and lower portions of a composite panel in which sand, fibers, and water were mixed and molded into cement according to the composition ratio of Table 2 below using an epoxy adhesive.

ingredient Content (% by weight) Plain cement 2708.24 (27% by weight) Sand (specific gravity 2.5) 5918 (59% by weight) Polyvinyl alcohol fiber 37.11 (0.37 wt.%) water 1367.16 (13.63 wt%) system 10030.5 (100% by weight)

Table 3 and Table 4 are the maximum fracture load and weight according to the specifications of the panels prepared in Examples 1 and 2 according to the present invention, respectively, compared with the panels of Comparative Example 1 and Comparative Example 2, wherein the maximum The failure load test measures the maximum failure load on the center of the panel after drying the panels cured in water for two weeks.

According to Table 3 and Table 4, it can be seen that the double floor panel of the present invention is lighter than the panel of the comparative example and exhibits high strength. That is, the weight reduction and high strength expression by aggregate and various admixtures were confirmed with respect to the panel of this invention.

 Panel specification Example 1 Comparative Example 1 Breaking load (kgf) Weight (kg) Breaking load (kgf) Weight (kg) 500 mm x 500 mm x 25 mm 1,500 11 1,240 14.3 500 mm x 500 mm x 21 mm 1,163 9.27 952 13 600 mm x 600 mm x 30 mm 1,615 19 1,250 25 600 mm x 600 mm x 25 mm 1,430 16 1,080 21

 Panel specification Example 2 Comparative Example 2 Breaking load (kgf) Weight (kg) Breaking load (kgf) Weight (kg) 500 mm x 500 mm x 25 mm 1,300 11.5 1,240 15 500 mm x 500 mm x 21 mm 1,225 10 890 13.5 600 mm x 600 mm x 30 mm 1,500 19.5 1,100 25.8 600 mm x 600 mm x 25 mm 1,420 16.4 990 21.9

As described above, the present invention is a panel for a double-floor material that meets high strength and light weight by manufacturing by mixing an appropriate amount of cement and lightweight aggregate polyvinyl alcohol fiber or nylon fiber, silica fume, polycarboxylic acid-based fluidizing agent and water. Can be provided.

Claims (13)

A high-strength lightweight panel for a double floor material having a single layer structure composed of a composite composition comprising 1 to 80% by weight of lightweight aggregate and 0.1 to 1% by weight of reinforcing fibers. According to claim 1, Cement 30 to 70% by weight, lightweight aggregate 30 to 60% by weight, reinforcing fibers 0.2 to 0.5% by weight, polycarboxylic acid-based fluidizing agent 0.5 to 1% by weight, silica fume 1 to 5% by weight, water 5 High-strength lightweight panel for a double floor made of a composite composition formed using a mixture containing from 10 to 10% by weight. According to claim 2, 40 to 45% by weight cement, 42 to 47% by weight lightweight aggregate, 0.3 to 0.4% by weight reinforcing fiber, 0.8 to 1% by weight polycarboxylic acid-based fluidizing agent, 2-3% by weight of silica fume, water 8 High-strength lightweight panel for a double floor made of a composite composition formed using a mixture containing from 9 to 9% by weight. The high-strength lightweight panel for dual floor materials according to claim 1, wherein the lightweight aggregate is a natural or artificial aggregate having a specific gravity of 0.1 to 1.5. The high-strength lightweight panel for dual floor materials according to claim 4, wherein the lightweight aggregate is a natural or artificial aggregate having a specific gravity of 0.5 to 1.0. According to claim 1, wherein the reinforcing fiber is one or more selected from polyvinyl alcohol fiber, nylon fiber, glass fiber, asbestos fiber, polypropylene fiber, carbon fiber, metal fiber, polyester fiber, aramid fiber, polyethylene fiber High strength lightweight panel for double floor materials. The high strength lightweight panel for double floor materials according to claim 6, wherein the reinforcing fibers are polyvinyl alcohol fibers. The high-strength lightweight panel for double floor materials according to claim 1, wherein a steel mesh is installed inside the panel. The method according to claim 8, wherein when the panel has a size of 500 mm × 500 mm × 21 mm to 600 mm × 600 mm × 30 mm, the weight is 9.27 to 19 kg and the maximum breaking load is 1,163 to 1,615 kgf. High strength lightweight panels for double floors. The high-strength lightweight panel for double floor materials according to claim 1, wherein a galvanized steel sheet is attached to upper and lower portions or the entire outer surface of the panel. 11. The method of claim 10, wherein when the size of the panel is 500mm x 500mm x 21mm to 600mm x 600mm x 30mm, the weight is 10 to 19.5 kg, the maximum breaking load is 1,225 to 1,500 kgf High strength lightweight panels for double floors. a) mixing the composite composition comprising the lightweight aggregate and reinforcing fibers to make a slurry; b) firstly injecting and flattening the slurry into the mold; c) installing a reinforcing steel mesh over the slurry injected into the mold; d) secondary injection of the slurry to cover the mesh and to finish the surface through a planarization operation; e) a method of manufacturing a high strength lightweight panel for a double floor comprising a curing step. a) mixing the composite composition comprising the lightweight aggregate and reinforcing fibers to make a slurry; b) injecting the slurry into the mold and curing after finishing the surface through a planarization operation; c) a method of manufacturing a high strength lightweight panel for a double floor comprising the step of adhering a galvanized steel sheet on the upper and lower parts or the entire outer surface of the cured panel.

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