KR101611569B1 - Cushion Structure for Reducing Noise Between Floors And Method for Constructing the Same - Google Patents

Abstract

The present invention relates to a buffer material for reducing a noise between floors. The buffer material is formed by mixing a ceramic-based resin and a mineral material to be laid on a floor slab to be completely bonded to the floor slab in order to prevent resonance, increase strength, and enable the buffer material to have low thermal conductivity and increased durability. According to the present invention, the buffer material for reducing a noise between floors comprises: a synthetic resin; and an inorganic binder where an additive selected from fly-ash, anhydrous gypsum, silica powder, canadensis (Na_2SO_4), and an EPS bead is mixed with cement. Therefore, the buffer material for reducing a noise between floors is laid on the floor slab of a structure.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for reducing noise between layers,

[0001] The present invention relates to a cushioning material for noise reduction applied to the floor of a building structure, more particularly, to a cushioning material for reducing noise by being absorbed by noise and vibration placed on a floor slab of a building structure, .

The floor impact sound reduction method in domestic apartment houses is mainly composed of inserting an interlayer noise cushion material between the slab of the bottom plate and the flooring of the flooring or installing a sound insulating film on the ceiling to block the transmission of the upstairs noise. In addition, the thickness of the existing slab layer is increased to reduce impact sound transmission.

Here, the thickness of concrete floor slabs in apartment houses has been steadily increasing since 2003, as the focus of national policy has been focused on reducing floor-to-floor noise by increasing the thickness of concrete floor slabs. For example, The thickness of concrete slabs, which were mostly 130 ~ 150mm, increased from 180mm in 2005 to 210mm in 2006. However, the results of several floor impact sound measurements and research reports show that it is practically difficult to reduce the interlayer noise of a concrete floor slab of this thickness. In other words, even to the highest level of concrete floor slab thickness, the highest level of the interstory noise is the most problematic weight impact sound measurement value. Many residents are suffering from floor to ceiling noise.

Also, as a main part of the interlayer floor, an interlayer noise-damping floor cushioning material which also serves as a heat insulation material, which is a key layer for reducing interlayer noise, is mainly EPS, EPP, PE, and EVA plastic foam products having a thickness of 20 to 30 mm, Laminated products are most widely used. Flat foam, embossing or ribs are formed on the bottom of such plastic foamed products or composite laminated products to have a shock absorbing performance against the upper shock.

However, currently used cushioning materials are mainly made of organic materials with low density and low dynamic range such as EPS and EVA. When these products are used between inorganic concrete slab and foamed concrete layer, And the slab and cushioning material are not fully bonded when the cushioning material is applied to the upper portion of the concrete slab, causing problems such as resonance shape and amplification of a specific frequency at the time of an upper shock.

Especially recently, the density of the buffer material and the shape (wave shape, embossed shape, flat shape, etc.) of the bottom plate have been varied, and problems such as cracking and settlement of the closed mortar due to deflection due to the upper load have been reported. Therefore, ceramic-based cushioning materials such as glass wool and mineral wool are used to increase the rigidity and to induce composite behavior by forming an integral floor structure rather than a floored structure as a homogeneous material with concrete slab and foam concrete layer, Although it is known, the material is expensive, and the thermal conductivity is high, which has a limited use problem.

Open Patent No. 10-2008-0096942 (published on April 4, 2008) Registration No. 10-0729234 (Registered on Jun. 11, 2007) Registration No. 10-0460732 (Registered on November 30, 2004)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a floor slab which is made by mixing a ceramic-based resin and an inorganic material so as to maintain a perfect bonding state with a floor slab, thereby preventing a resonance phenomenon, And has a low thermal conductivity and high durability.

It is another object of the present invention to provide a cushioning material for reducing interlayer noise which can be quickly and easily applied by placing a cushioning material for reducing interlayer noise on a floor slab, and a method of constructing the cushioning material.

According to an aspect of the present invention, there is provided a cushioning material for reducing noise in a floor structure comprising: a synthetic resin; And an inorganic binder in which cement is mixed with additive materials selected from fly ash, anhydrous gypsum, silica powder, manganese (Na ₂ SO ₄ ), and EPS beads are mixed and then applied to the bottom slab of the structure.

According to one aspect of the present invention, the synthetic resin and the inorganic binder are mixed and placed on the floor slab.

When the cushioning material of the present invention is cured after being placed on the floor slab, a part of the cement, the fly ash and the synthetic resin constitute a lower layer portion when they are placed on the floor slab, and the other portions of the silica powder, And the remainder of the EPS bead and the synthetic resin constitute an upper layer stacked on the upper part of the intermediate layer.

In the method of constructing the cushioning material of the present invention as described above,

(a) mixing a synthetic resin and an inorganic binder;

(b) curing the mixture mixed in the step (a) on the bottom slab;

And a control unit.

The cushioning material of the present invention is made by mixing an inorganic binder containing cement and a synthetic resin to form a perfect joint with the bottom slab. Therefore, it is possible to prevent a resonance phenomenon, have excellent strength, residual strain and dynamic elastic modulus, The noise cancellation performance is excellent.

1 is a cross-sectional view of a floor structure to which a cushioning material is applied according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a cross-sectional structure of a cushioning material according to an embodiment of the present invention.
3 is a cross-sectional view of a floor structure to which a cushioning material is applied according to another embodiment of the present invention.
4 is a graph showing the compressive strength test results of various embodiments of the cushioning material according to the present invention.
FIG. 5 is a graph showing the result of residual strain test for various embodiments of the cushioning material according to the present invention. FIG.
6 is a graph showing the results of the dynamic modulus test for various embodiments of the cushioning material according to the present invention.
7 is a graph showing the results of ball impact test for various embodiments of the conventional cushioning material and the cushioning material according to the present invention.
8 is a graph showing the results of a bang machine test for various embodiments of conventional cushioning materials and cushioning materials according to the present invention.

Hereinafter, a cushioning material for reducing interlayer noise according to a preferred embodiment of the present invention and a construction method thereof will be described with reference to the accompanying drawings.

FIG. 1 is a bottom structure to which a cushioning material for reducing interlayer noise according to an embodiment of the present invention is applied. The cushioning material 10 for reducing noise between layers of the present invention is made of a mixture of a synthetic resin and an inorganic binder, (1) and then cured.

The synthetic resin is a silicone-modified aqueous acrylic emulsion which is suspended in a white color and has the properties shown in Table 1 below.

Density (g / cm3) Fusible solids
(dissoluble solid) (%) Viscosity (cps) Glass transition temperature Tg (占 폚) 물 성분 state 1.04 + - 0.10 50.0 ± 1.0 10 to 800 -15 ℃ 35% liquid

The synthetic resin and the inorganic binder are mixed in a weight ratio of about 1: 1.

The inorganic binder is selected from fly ash, anhydrous gypsum, silica powder, Na ₂ SO ₄ , EPS beads, etc. The additive material is mixed with the cement to increase the rigidity and receive a certain partial load . It is preferable that the additive material to be mixed with the cement includes fly ash, anhydrous gypsum, silica powder, gum (Na ₂ SO ₄ ), and EPS beads.

Wherein the inorganic binder is a mixture of 17 to 30 wt% of cement, 25 to 35 wt% of fly ash, 7 to 10 wt% of anhydrous gypsum, 30 to 35 wt% of silica powder, 0.5 to 1.5 wt% . ≪ / RTI >

The fly ash is mixed for initial hydration heat inhibition, shrinkage reduction, and long-term strength enhancement. Anhydrous gypsum is used as a swelling agent to suppress shrinkage cracks caused by curing of the cement.

In addition, silica powder is used as a filler for improving cracking and density due to shrinkage caused by shrinkage of acrylic resin, and it is possible to improve insulation performance by mixing a certain amount of EPS beads in order to lower the thermal conductivity of the manufactured buffer material.

The sodium sulfate (Na ₂ SO ₄ ) (sodium sulfate) is a material added for initial strength development. If the blending ratio of the inorganic binder in the inorganic binder is lower than 0.5 wt%, the effect of initial strength development is very low. Therefore, the blend should be mixed with 0.5 wt% or more of the total weight of the inorganic binder . If the compounding ratio exceeds 1.5 wt%, the amount of SO ^{3 -} ions increases to cause abrupt ettringite formation. As a result, a collapse phenomenon occurs inside the matrix, which causes a decrease in strength and cracks Therefore, it is used at 1.5 wt% or less.

As described above, the mixture of the synthetic resin (silicone-modified water-based acrylic emulsion) and the inorganic binder is placed on the floor slab 1 to form the cushioning material 10.

When the cushioning material (10) is placed on the bottom slab (1) and cured, the inorganic binder material mixed with the synthetic resin is formed into a plurality of layers by the specific gravity difference. 2, a portion of the cement, fly ash, and synthetic resin having a large specific gravity sags downward to form a lower layer portion 11, and the other portion of the silica powder, anhydrous gypsum and synthetic resin is mixed with the lower layer portion 11, And the remaining part of the EPS bead and the synthetic resin constitute an upper layer 13 which is laminated on the upper part of the middle layer 12.

Since the cushioning material 10 having a plurality of layers as described above is integrated with the lower layer portion 11 including the cement attached to the upper surface of the bottom slab 1, the phenomenon of lifting after the construction is eliminated and the resonance phenomenon is suppressed, and high strength and low thermal conductivity , Resulting in high durability.

In particular, the cushioning material (10) of the present invention has excellent initial strength development effect and adhesion strength improving effect by mixing cement and gum with an inorganic binder.

The method of constructing the cushioning material (10) of the present invention comprises a step of mixing a synthetic resin and an inorganic binder, and a step of curing the mixture of the synthetic resin and an inorganic binder by placing the mixture on the floor slab (1).

The step of mixing the synthetic resin and the inorganic binder may be performed by first mixing an additive material other than the EPS beads with cement to prepare a primary mixture of an inorganic binder, mixing the silicone modified aqueous acrylic emulsion and the EPS bead to form a final mixture .

After the cushioning material 10 of the present invention is laid and cured on the floor slab 1, a lightweight foamed concrete is placed on the cushioning material 10 as shown in Fig. 1 to form a foamed concrete layer 2, The boiler pipe 3 is installed on the foamed concrete layer 2 and the cement mortar is laid on the floor to form the flooring layer 4 and then the finish layer 5 is formed by placing the mortar on the floor.

As described above, the cushioning material 10 may be formed as a single layer on the floor slab 1, but a mixture of a synthetic resin and an inorganic binder is placed on the floor slab 1 as shown in Fig. 3 The mixture is cured to form a first buffer material layer 10a and then a mixture of the synthetic resin and an inorganic binder is poured and cured again in place of lightweight foamed concrete to form a second buffer material layer 10b, So that the cushioning material for noise reduction of the present invention can be realized.

Example

4 to 6 are graphs showing the mixing ratios of the inorganic binders with the acrylic emulsion resin (product of AR A400S) at a ratio of 1: 1 Residual strain, and dynamic elastic modulus test results of Examples 1 to 9 of the cushioning material prepared by mixing the cushioning materials in a weight ratio.

Cement (% by weight) Silica powder (% by weight) Other additives One
0
25

Manganese: 1 wt%
EPS beads: 1 wt%
Anhydrous gypsum: 8 wt%
Fly ash: remainder

2 30 3 35 4
15
25 5 30 6 35 7
30
25 8 30 9 35

4 to 6, it can be seen that the greater the content of cement and silica powder, the higher the compressive strength and the dynamic elasticity coefficient. In order to have an excellent compressive strength of 10 kgf / cm 3 or more, the content of silica powder is preferably 30% Do.

However, since the remanent strain increases as the content of the silica powder increases from 30 wt% to the cement content, the content of the silica powder is preferably limited to 35 wt%.

7 and 8 show the noise blocking performance test results (bam machine and ball impact sound test) for the conventional EPS cushioning material (comparative example) and Examples 4, 6, 7 and 9, As can be seen, the cushioning material of the present invention is superior to the conventional cushioning material in blocking the heavy impact sound in the low frequency band.

As described above, the cushioning material of the present invention has excellent strength and residual strain dynamic elastic modulus, and it has been confirmed that the noise shielding performance is superior to the conventional cushioning material, especially in the low frequency band.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the appended claims. And it is to be understood that such modified embodiments belong to the scope of protection of the present invention defined by the appended claims.

1: bottom slab 2: foamed concrete layer
10: cushioning material 10a: primary cushioning material layer
10b: Secondary buffer material layer 11: Lower layer
12: middle layer portion 13: upper layer portion

Claims (10)

A synthetic resin;
An inorganic binder mixed with cement, additive materials selected from fly ash, anhydrous gypsum, silica powder, manganese (Na ₂ SO ₄ ) and EPS beads;
And is installed on the bottom slab of the structure,
The cement, the fly ash and a part of the synthetic resin constitute the lower layer portion 11 when it is applied on the floor slab, and the other portion of the silica powder, the anhydrous gypsum and the synthetic resin are stacked on the lower layer portion 11 And the remaining part of the EPS bead and the synthetic resin constitute an upper layer part (13) laminated on the upper part of the middle layer part (12). delete delete The cushioning material as claimed in claim 1, wherein the synthetic resin is a silicone-modified aqueous acrylic emulsion. 5. The cushioning material according to claim 4, wherein the silicone-modified aqueous acrylic emulsion and the inorganic binder are mixed at a weight ratio of 1: 1. 6. The method of claim 5, wherein the inorganic binder comprises 17 to 30 wt% of cement, 25 to 35 wt% of fly ash, 7 to 10 wt% of anhydrous gypsum, 30 to 35 wt% of silica powder, 0.5 to 1.5 wt% 0.5 to 1.5% by weight based on the total weight of the cushioning material. The method of claim 1, wherein a mixture of a synthetic resin and an inorganic binder is placed on the bottom slab to form a first buffer material layer (10a), and a mixture of a synthetic resin and an inorganic binder is applied on the first buffer material layer And a second buffer material layer (10b) is formed by being poured into the second buffer material layer (10b). 8. A method of constructing a cushioning material for interlayer noise reduction according to any one of claims 1 to 7,
(a) mixing a synthetic resin and an inorganic binder;
(b) placing the mixed mixture in the step (a) on a floor slab and curing to form a cushioning material;
Wherein the cushioning material is formed on the surface of the cushioning material. [8] The method of claim 8, wherein the step (a) comprises mixing an additive material other than EPS beads with cement to prepare a primary mixture of an inorganic binder, mixing the primary mixture with a silicone-modified aqueous acrylic emulsion and an EPS bead and the mixture to be poured is made in step (b). 9. The cushioning material for reducing interlayer noise as claimed in claim 8, wherein after the step (b) is performed, the mixture mixed in the step (a) is laid on the cured cushioning material to cure the cushioning material. Construction method.

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