KR20220149814A - Mortar composition for improving impact sound resistance, mortar layer for improving impact sound resistance, and floor structure for improving impact sound resistance Including thereof - Google Patents

Abstract

An inter-floor noise-preventing mortar composition is provided. In one embodiment, the mortar composition comprises, per 100 parts by weight of the mortar composition: 60 to 70 parts by weight of heavy aggregate; 10 to 40 parts by weight of a binding material; 1.0 to 5.0 parts by weight of admixture B; and 1.0 to 5.0 parts by weight of admixture C, wherein the heavy aggregate includes at least one of wind-milled slag, electric furnace oxidized slag, copper slag, soft slag, ferronickel slag, and blast furnace slag, the binding material includes at least one of Type 1 Portland cement, Type 3 Portland cement, blast furnace slag powder, and alumina cement, the admixture B has a powder degree of 5000 to 7000 cm^2/g, and the admixture C may include a lime gypsum-based expanding material.

Description

Interlayer noise prevention mortar composition, mortar layer, and interlayer noise prevention floor structure comprising the same

The present invention relates to an interlayer noise prevention mortar composition, a mortar layer, and an interlayer noise prevention floor structure comprising the same, and by moving the natural frequency (f _o ) band of the floor structure and thus preventing the occurrence of a resonance phenomenon, the generation of noise between floors It relates to an interlayer noise prevention mortar composition capable of reducing noise, a mortar layer, and an interlayer noise prevention floor structure comprising the same.

In general, in the case of an apartment or multi-family house consisting of two floors, various sounds from the lower floor are transmitted to the upper floor, or the impact sound from the upper floor is transmitted to the lower floor, which interferes with sleep and activities in the living space. In addition, it is necessary to block noise and vibration of building equipment such as machine rooms and air conditioning rooms from being transmitted to adjacent spaces.

Inter-floor noise refers to a phenomenon in which sound generated in one space of a multi-family house or apartment is transmitted to another space. It refers to a phenomenon in which sound is easily transmitted from one floor to another as solid propagation sound changes from one space to air propagation sound. As an example, there is noise due to shock and vibration caused by walking, movement, or falling of an object.

The noise can be divided into a light impact sound generated by the impact of a relatively light and hard object, such as when an object is dropped or furniture is pulled, and a heavy impact sound generated when a heavy and soft impact is applied to the floor, such as when a child runs. . Light impact sound has a high range, but has a weak impact force and short duration, whereas a heavy impact sound has a relatively low range, high impact force, and long acoustic duration. In addition, the size of the light impact sound is greatly affected by the flexibility of the surface finishing material, while the size of the heavy impact sound is greatly affected by the transmission body, that is, the rigidity, density, area, and fixing conditions of the floor or wall.

In order to solve this problem, various cushioning materials for interlayer noise blocking have been developed and sold in Korea, and various types of impact sound reducing materials have been developed. Research has been actively conducted over the past 10 years.

However, if only EPS (Expandable Polystyrene, Styrofoam) and EPP (Expandable Polyethylene), which have been used as materials for cushioning materials, are applied as an interlayer noise prevention layer, they have low durability, so floor settlement or cracking occurs during long-term use, resulting in resonance. Noise can occur due to resonance, and the existing lightweight foam concrete has a large shrinkage change due to the pouring and drying process, so cracking occurs frequently, which can cause problems in sound absorption and insulation. In addition, the finishing mortar with high thermal conductivity permeates between these cracks, thereby reducing the heating effect. In addition, plywood flooring, which is often used as a floor finishing material, has problems in that it has poor durability due to weak surface strength, is difficult to maintain due to adhesion and close construction, and transmits a light impact sound directly.

In addition, it is known that there is a certain effect on the light impact sound according to the conventional technologies applied to prevent the generation of interfloor noise, but the sound insulation performance of the heavy impact sound is not improved to L-60 or higher with the L index. Therefore, even if the sound insulation performance for light impact sound is partially improved according to the construction of the floor impact sound reducing material, the sound insulation performance for heavy impact sound, which is the key to the problem in the residential conditions of Korean apartment houses, is still poor.

In order to solve this problem, there have been attempts to develop and additionally laminate a conventional floor sound insulating material, but there is little improvement in performance. In addition, in the case of a conventional concrete building, etc., the floor surface is basically coated with lightweight foamed concrete on the concrete slab, and then finished with cement mortar or artificial stone mortar to make noise with lightweight foamed large concrete built on the upper surface of the reinforced concrete slab. Attempts have been made to attenuate the noise, but the noise attenuation action of lightweight foamed concrete has a problem in that it does not properly absorb and block noise caused by light impact and heavy impact.

Therefore, it is necessary to develop a technology to fundamentally prevent the occurrence of various inter-floor noises.

Republic of Korea Patent Registration No. 10-0583847 (2006.05.19)

The present invention is to solve the problems of the prior art as described above, by manufacturing a mortar layer having a high unit volume and satisfying the strength of a general household floor mortar, and moving the natural frequency (f _o ) band of the floor structure, thereby Therefore, it is possible to reduce the generation of noise between floors by preventing the occurrence of resonance, and at the same time, noise prevention mortar composition between floors, noise prevention mortar layer between floors, and noise prevention between floors with improved workability, material separation characteristics, bleeding characteristics, and drying shrinkage characteristics. We want to provide a floor structure.

In order to solve the above problems, the present invention contains 60 to 70 parts by weight of aggregate by weight, 10 to 40 parts by weight of binder, 1.0 to 5.0 parts by weight of admixture B, and 1.0 to 5.0 parts by weight of admixture C per 100 parts by weight of mortar composition. It provides an interlayer noise prevention mortar composition.

The present invention also provides a mortar layer prepared from a mortar composition comprising a heavy aggregate, a binder, an admixture B, and an admixture C, in order to solve the above problems, the unit weight is 2500 to 2700 kg/m³ and the age of 28 It provides a mortar layer for preventing interlayer noise, which satisfies one standard of compressive strength of 15 to 50 MPa.

The present invention also provides a floor slab; a first mortar layer disposed on the floor slab; a floor cushioning material disposed on the first mortar layer; and a second mortar layer disposed on the floor cushioning material, wherein the first mortar layer and the second mortar layer are prepared from a mortar composition comprising a heavy aggregate, a binder, an admixture B, and an admixture C, and a unit volume Provided is a floor structure for preventing noise between floors having a weight of 2500 to 2700 kg/m³ and a compressive strength of 15 to 50 MPa based on the age of 28 days.

According to an embodiment of the present invention, it is possible to reduce the generation of noise between floors by moving the natural frequency (f _o ) band of the floor structure and thus preventing the occurrence of a resonance phenomenon.

In addition, according to an embodiment of the present invention, workability, material separation characteristics, bleeding characteristics, and drying shrinkage characteristics of the mortar layer may be improved.

1 is a graph showing the natural frequency of the floor structure and the frequency of the weight impact sound. FIG. 1 (a) shows the resonance phenomenon of the natural frequency (f _o ) of the floor structure, and FIG. It shows that the frequency (f _o ) band is shifted from FIG. 1(a) to prevent the resonance phenomenon from occurring.

Hereinafter, preferred embodiments according to the present invention will be described in detail. However, the following examples are provided so that those of ordinary skill in the art can fully understand the present invention, and can be modified in various other forms, and the scope of the present invention is limited to the examples described below it's not going to be

The mortar layer referred to in the present invention may refer to a mortar through the hole.

Bangtong referred to in the present invention is an abbreviation for tongmijang on the floor and may refer to a type of plastering work.

The applicant of the present invention, in order to find a fundamental solution that can reduce the noise between floors of an apartment house, the resonance phenomenon that appears as shown in FIG. The focus was on a method of shifting the natural frequency (f _o ) band of the floor structure so that the vibration of the floor structure does not occur, and after much research and trial and error, the present invention described below was developed.

That is, the mortar layer prepared from the mortar composition of the present invention is characterized in that the unit volume weight is 2,600 ± 100 kg / m³ and the compressive strength based on the age of 28 days is 15 to 50 MPa. When the mortar layer prepared from the mortar composition of the present invention satisfies the unit volume weight and compressive strength of the above numerical ranges, the natural frequency (f _o ) band of the floor structure moves as shown in FIG. By being prevented, it is possible to reduce the generation of noise between floors. For example, the absolute value of the difference between the frequency of the peak point of the natural frequency f _o of the floor structure including the mortar layer and the frequency of the peak point of the excitation frequency of the heavy impact sound may satisfy 32 to 125 Hz. At the same time, the mortar layer prepared from the mortar composition of the present invention is characterized by excellent workability, material separation properties, bleeding properties, and drying shrinkage properties.

Hereinafter, the present invention will be described in more detail.

The mortar composition of the present invention may include a heavy aggregate, a binder, an admixture B, an admixture C, an admixture A, and an admixture B.

The weight aggregate may be included in 60 to 70 parts by weight based on 100 parts by weight of the mortar composition. The heavy aggregate is for imparting weight to the mortar composition and the mortar layer prepared therefrom, and may include a weight aggregate having a density of 2.9 g/cm ³ to 4.0 g/cm ³ among KS certified aggregates. For example, the heavy aggregate is wind slag (PS Ball, about 3.8 g/cm ³ ), electric furnace oxidation slag (about 3.6 g/cm ³ ), copper slag (about 3.5 g/cm ³ ), soft slag (about 3.5 g/cm ³ ), ferronickel slag (about 3.1 g/cm ³ ), and blast furnace slag (about 2.9 g/cm ³ ) may include at least one. The weight aggregate can give weight to the mortar composition and the mortar layer prepared therefrom within the above numerical range, while preventing poor physical properties.

The binder may be included in an amount of 10 to 40 parts by weight, for example, 18 to 30 parts by weight, based on 100 parts by weight of the mortar composition. The binder may improve the viscosity and material separation resistance of the mortar composition and the mortar layer prepared therefrom within the above numerical range. For example, the binder may have a density of 2.0 g/m ³ to 4.5 g/m ³ , for example, at least one of type 1 Portland cement, type 3 Portland cement, fine blast furnace slag powder, and alumina cement. may include.

Admixture B may include 1.0 to 5.0 parts by weight based on 100 parts by weight of the mortar composition. Admixture B may prevent material separation and cracking of the mortar composition and the mortar layer prepared therefrom within the above numerical range, and improve workability, but not enhance strength. For example, the admixture B may include high powder limestone. For example, the high powder limestone may have a fineness of 5000 to 7000 cm 2 /g. When high-powder limestone having a composition and fineness within the above numerical range is used, as it has a finer size than cement, it is possible to fill the micropores formed during cement hardening, thereby improving the fluidity of the mortar composition and preventing material separation. can

Admixture C may contain 1.0 to 5.0 parts by weight based on 100 parts by weight of the mortar composition. Admixture C can prevent cracking of the mortar composition and the mortar layer prepared therefrom within the above numerical range. For example, the admixture C may include a lime gypsum-based intumescent material. For example, the lime gypsum-based expansion material may include at least one of limestone, coke, generated ash, and anhydrite. When a gypsum-lime expansion material within the above numerical range is used, it chemically reacts with water and/or cement components to exhibit initial expansion and long-term drying shrinkage reduction properties, and to improve durability by improving the watertightness of the mortar.

Admixture A may be included in an amount of 0.01 to 1.0 parts by weight based on 100 parts by weight of the mortar composition. Admixture A can increase the unit weight by achieving the effect of reducing the unit quantity of the mortar composition and the mortar layer prepared therefrom within the above numerical range. For example, the admixture A is rigine sulfonate, polynaphthalene sulfonate. It may include at least one of polymelamine sulfonate, and polycarboxylate.

Admixture B may be included in an amount of 0.01 to 1.0 parts by weight based on 100 parts by weight of the mortar composition. Admixture B may prevent material separation and improve workability of the mortar composition and the mortar layer prepared therefrom within the above numerical range. For example, the admixture B is methyl cellulose, ethyl cellulose. It may include at least one of hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose.

That is, when the mortar composition of the present invention is within the above composition range, the mortar layer prepared from the mortar composition has a unit volume weight of 2,600±100 kg/m³ and a compressive strength based on 28 days of age satisfies 15 to 50 MPa, and thus Accordingly, the natural frequency _band of the floor structure moves as shown in FIG. 1(b) to prevent the resonance phenomenon from occurring, thereby reducing the generation of noise between floors, and at the same time workability, material separation characteristics, bleeding characteristics, and Dry shrinkage characteristics may be improved.

Additionally, the mortar composition of the present invention may further include 1 to 10 parts by weight of an organic binder. The organic binder induces bonding of each component in the mortar composition within the above numerical range to improve material separation resistance, thereby solving possible problems caused by the use of heavy aggregates. For example, the organic binder may include at least one of acrylic acid, acrylic acid copolymer, vinyl acetate, vinyl acetate copolymer, polyvinyl alcohol, and ethylene vinyl acetate.

Additionally, the mortar composition of the present invention may further include 1 to 5 parts by weight of an ethylene-methyl acrylate methacrylic copolymer. Ethylene-methyl acrylate methacrylic can alleviate the problems that may occur as the strength is lowered by improving the durability of the mortar composition and the mortar layer prepared therefrom within the above numerical range.

Additionally, the mortar composition of the present invention may further include 1 to 5 parts by weight of the vinyl acetate-diethyl maleate copolymer. The vinyl acetate-diethyl maleate copolymer induces bonding of each component in the mortar composition within the above numerical range to improve material separation resistance, thereby solving possible problems caused by the use of heavy aggregates.

The mortar composition of the present invention is not limited in type as long as it is a conventional mortar composition for construction, and suitable types of cement, gravel, sand, etc. may be used according to the purpose. Furthermore, the amount of water added to blend the mortar composition may be added in an appropriate amount depending on the purpose, for example, 10 to 25 parts by weight per 100 parts by weight of the mortar composition may be included. In the above numerical range, the mortar composition of the present invention may have a viscosity that can be poured like a conventional cement slurry.

As an example of the floor structure of the present invention, it may have an arrangement structure including a floor slab, a first mortar layer, a floor cushioning material, and a second mortar layer from bottom to top. For example, the floor cushioning material may include expanded polystyrene (EPS). For example, the first mortar layer and the second mortar layer are prepared from the above-described mortar composition, have a unit volume weight of 2,600±100 kg/m³, and have a compressive strength of 15 to 50 MPa based on the age of 28 days, As a result, the natural frequency _band of the floor structure moves as shown in FIG. , and drying shrinkage characteristics may be improved. For example, the natural frequency (f _o ) band of the floor structure _shifts as in FIG. The absolute value of the frequency difference of the peak point becomes 32 to 125 Hz, so that the occurrence of a resonance phenomenon can be prevented.

Specifically, the applicant of the present invention found that when the floor structure of the present invention includes a floor slab and a weight mortar, 4 to 6 dB is reduced in the 63 Hz band, and in the 125 to 500 Hz band when the floor slab and the floor buffer are included. It was confirmed that about 15 dB was reduced, and in the case of having the above floor structure, that is, an arrangement structure including a floor slab, a first mortar layer, a floor buffer, and a second mortar layer from the bottom to the top, in the 63 to 500 Hz band It was confirmed that noise can be reduced.

As another example of the floor structure of the present invention, a completely dry floor structure in which a floor slab 210 mm, a weight mortar of 60 mm, a heating pipe panel 30 mm, and a dry finish panel 20 mm are disposed from the bottom to the top may be included. In this case, the weight mortar refers to the above-described mortar layer.

Another example of the floor structure of the present invention may include a heavy mortar double floor structure in which 210 mm of floor slab, 50 mm of weight mortar, 30 mm of floor cushioning material, and 30 mm of finishing mortar are disposed from the bottom to the top. In this case, the weight mortar refers to the above-described mortar layer.

The method of constructing a floor structure of the present invention comprises: removing the laitance, foreign substances, and impurities of the floor slab using a grinder, a water jet, etc. and cleaning it using a vacuum suction device; To strengthen the surface layer on the cleaned upper part, to prevent penetration of water, harmful substances, etc., and to apply a primer to increase adhesion to the bottom surface; And Pouring the above-mentioned mortar composition on the applied top; and curing the poured mortar composition to form a mortar layer.

then forming a cushioning material on the mortar layer; and forming a mortar layer by pouring and curing the above-described mortar composition on the cushioning material.

On the other hand, selectively installing piping for heating at regular intervals on the upper portion of the mortar layer; forming a mortar layer by pouring and curing the above-described mortar composition on the pipe; and finishing the surface by plastering the surface of the mortar layer.

Hereinafter, the present invention will be described in detail by way of Examples. The following examples only illustrate the present invention, and the scope of the present invention is not limited to the following examples.

preparation example

The following materials were prepared to prepare the mortar compositions and mortar layers according to Examples and Comparative Examples of the present invention.

Lightweight aggregate: Washed sand (sea sand) or crushed fine aggregate

Heavy aggregate: Heavy fine aggregate with a density of 3.5 to 3.6 g/m ³

Bonding material: Portland cement with a density of 3.1±1 g/m ³

Admixture A: fly ash with a density of 2.1±1 g/m ³

Admixture B: high powder limestone with a density of 2.9±1 g/m ³

Admixture C: Lime gypsum-based crack preventing material with a density of 2.9±1 g/m ³

Admixture A: polycarboxylate-based dispersant

Admixture B: hydroxyethylcellulose thickener

Example 1

Based on 100 parts by weight of the mortar composition, 67 parts by weight of the aggregate by weight, 30 parts by weight of the binder, 1.0 parts by weight of the admixture B, 2.0 parts by weight of the admixture C, 0.1 parts by weight of the admixture A, and 0.1 parts by weight of the admixture B in a mixer and mixing the mortar composition was prepared.

After adding 15.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm * 4 cm * 4 cm in width*length*height, and a diameter for measuring elastic modulus A 10 cm * 20 cm height cylindrical mortar layer was prepared.

Example 2

Based on 100 parts by weight of the mortar composition, 67 parts by weight of aggregate by weight, 25 parts by weight of binder, 6.0 parts by weight of admixture B, 2.0 parts by weight of admixture C, 0.1 parts by weight of admixture A, and 0.1 parts by weight of admixture B in a mixer to prepare a mortar composition did.

After adding 15.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm * 4 cm * 4 cm in width*length*height, and a diameter for measuring the elastic modulus A 10 cm * 20 cm height cylindrical mortar layer was prepared.

Example 3

Based on 100 parts by weight of the mortar composition, 67 parts by weight of aggregate, 20 parts by weight of binder, 11.0 parts by weight of admixture B, 2.0 parts by weight of admixture C, 0.1 parts by weight of admixture A, and 0.1 parts by weight of admixture B were added to a mixer to prepare a mortar composition did.

After adding 14.5 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm * 4 cm * 4 cm in width*length*height, and a diameter for measuring elastic modulus A 10 cm * 20 cm height cylindrical mortar layer was prepared.

Comparative Example 1

Based on 100 parts by weight of the mortar composition, 75 parts by weight of the lightweight aggregate, 20 parts by weight of the binder, 3.0 parts by weight of the admixture A, and 2.0 parts by weight of the admixture C were mixed in a mixer to prepare a mortar composition.

After adding 20.0 parts by weight of water to the prepared mortar composition, it was cured to measure compressive strength and shrinkage, and a rectangular mortar layer having a size of 16 cm * 4 cm * 4 cm in width * length * height, elastic modulus for measurement A cylindrical mortar layer of 10 cm in diameter * 20 cm in height was prepared.

Comparative Examples 2 to 7

Mortar compositions according to Comparative Examples 2 to 7 were prepared at the compounding ratios shown in Table 1 below, and a mortar layer having the same size as that of Comparative Example 1 was prepared therefrom.

Mixing ratio (parts by weight) W/R
(parts by weight) lightweight
aggregate weight
aggregate binder admixture A admixture B admixture C admixture A admixture B Example 1 -- 67 30 -- 1.0 2.0 0.1 0.1 15.5 Example 2 -- 67 25 -- 6.0 2.0 0.1 0.1 15.5 Example 3 -- 67 20 -- 11.0 2.0 0.1 0.1 14.5 Comparative Example 1 75 -- 20 3.0 -- 2.0 -- -- 20.0 Comparative Example 2 67 -- 30 1.0 -- 2.0 0.1 -- 17.0 Comparative Example 3 -- 70 28 -- -- 2.0 0.1 -- 15.0 Comparative Example 4 -- 60 38 -- -- 2.0 0.1 -- 17.0 Comparative Example 5 -- 67 20 -- 11.0 2.0 0.1 0.2 15.5 Comparative Example 6 -- 67 20 -- 13.0 -- 0.1 0.1 14.5 Comparative Example 7 -- 67 30 -- 1.0 2.0 0.1 -- 15.5

Experimental example

The physical properties of the mortar layers of Examples 1 to 3 and Comparative Examples 1 to 7 were tested, and the results are shown in Tables 2 and 3.

Specifically, the flow is to measure workability. After filling the flow cone having an upper diameter of 70 mm, a lower diameter of 100 mm, and a height of 50 mm specified in KS L 5111, the flow cone is lifted without compaction and the flow is measured. did.

The unit volumetric weight was measured in accordance with the KS L 5220 method, but by measuring the weight by filling a 1L container with a mortar layer.

Compressive strength was measured by the KS L 5220 method (dry cement mortar).

Bleeding and material separation were measured by the KS F 2433 method (testing method for bleeding rate and expansion rate of injection mortar).

The drying shrinkage is determined by filling each water-mixed bibimated mortar composition in a mold of 40 mm × 40 mm × 160 mm, and then leaving it at a temperature of 20 ± 2 ° C. After curing for 28 days under curing conditions of standard temperature of 20±2°C and humidity of 65±5%, the later length of the mortar was measured, and the percentage change in shrinkage length of the mortar was calculated.

In addition, the impact sound reduction characteristics were performed by the method of KS F 2810 using a bang machine.

flow
(mm) unit volume
mass
(kg/m ³ ) Compressive strength (MPa) ingredient
separation bleeding dry
Shrink
(%) modulus of elasticity
(28 days, MPa) 3 days 7 days 28 days Example 1 215 2,580 21.3 26.7 45.1 doesn't exist doesn't exist -0.023 1.74x10 ⁴ Example 2 210 2,578 13.7 18.8 30.8 doesn't exist doesn't exist -0.022 1.27x10 ⁴ Example 3 210 2,585 8.0 14.7 18.1 doesn't exist doesn't exist -0.015 1.16x10 ⁴ Comparative Example 1 210 2,120 7.2 12.2 16.3 doesn't exist has exist -0.012 0.94x10 ⁴ Comparative Example 2 215 2,170 18.6 20.6 39.6 doesn't exist has exist -0.031 1.69x10 ⁴ Comparative Example 3 235 - - - - has exist has exist - - Comparative Example 4 220 2,410 28.7 42.8 65.7 doesn't exist doesn't exist -0.050 - Comparative Example 5 180 2,540 7.5 13.7 17.7 doesn't exist doesn't exist -0.015 - Comparative Example 6 210 2,583 9.6 15.2 20.1 doesn't exist doesn't exist -0.069 - Comparative Example 7 220 2,610 22.0 26.8 39.4 doesn't exist has exist -0.023 -

Examples 1 to 3 use a high-density fine aggregate and have a high unit volume mass, while the flow is similar to Comparative Examples 1 and 2, but material separation or bleeding does not occur, and the length change is also similar, so work for construction site performance It was confirmed that it was a formulation that secured stability of performance and durability.

In Examples 1 to 3, the mixing amount of water having a low density may be reduced by using the admixture A (dispersant) in order to maintain a high unit volume mass. Specifically, by using high-powder limestone and low-viscosity hydroxyethyl cellulose thickener, material separation prevention and high workability were achieved while maintaining low compressive strength.

In Comparative Example 1, a general-strength dry mortar using lightweight aggregate (sea sand, crushed fine aggregate) was applied, and in Comparative Example 2, a high-strength dry mortar was applied.

In the case of Comparative Example 3, the amount of powder was too small, so material separation occurred, and thus, it was not possible to measure the physical properties.

In the case of Comparative Example 4, the high viscosity due to an excessive amount of binder deteriorates workability, and the dry shrinkage rate is increased due to high compressive strength, which may lead to greater cracking in the long term compared to Examples 1 to 3.

Comparative Example 5 has a low flow due to an increase in viscosity due to an excessive amount of admixture B (thickener) used, and may cause deterioration in workability compared to Examples 1 to 3.

In Comparative Example 6, the drying shrinkage rate was more than three times higher than in Examples 1 to 3 as the crack preventing material was not mixed, and crack generation may be large.

In Comparative Example 7, as the thickener was not mixed, bleeding occurred, and the surface strength may be weakened.

In Examples 1 to 3 and Comparative Examples 1 to 2, the compressive strength value was found to be correlated with the elastic modulus, and 1.0 x 10 together with the unit volume mass and the compressive strength numerical range according to an embodiment of the present invention It was confirmed that when the elastic modulus of ⁴ to 1.8 x 10 ⁴ was satisfied, the generation of interlayer noise could be reduced, and at the same time, workability, material separation characteristics, bleeding characteristics, and drying shrinkage characteristics could be improved.

As described above, the mortar layer prepared from the mortar composition of the present invention has a unit volume weight of 2,600±100 kg/m³ and a compressive strength of 15 to 50 MPa based on the age of 28 days, and accordingly, the inherent characteristics of the floor structure The frequency (f _o ) band moves as shown in FIG. 1(b) to prevent the resonance phenomenon from occurring, thereby reducing the generation of noise between floors, and at the same time improving workability, material separation characteristics, bleeding characteristics, and drying shrinkage characteristics. can be

Although the present invention has been described in detail only with respect to the described embodiments, it is obvious to those skilled in the art that various modifications and variations are possible within the scope of the technical spirit of the present invention, and it is natural that such variations and modifications belong to the appended claims. .

Claims (7)

60 to 70 parts by weight of aggregate by weight, 10 to 40 parts by weight of binder, 1.0 to 5.0 parts by weight of admixture B, and 1.0 to 5.0 parts by weight of admixture C per 100 parts by weight of the mortar composition,
The heavy aggregate includes at least one of wind chain slag, electric furnace oxide slag, copper slag, soft slag, ferronickel slag, and blast furnace slag,
The binder includes at least one of type 1 Portland cement, type 3 Portland cement, blast furnace slag fine powder, and alumina cement,
The admixture B has a fineness of 5000 to 7000 cm / g,
The admixture C is an interlayer noise prevention mortar composition comprising a lime gypsum-based expansion material.
The method according to claim 1,
Further comprising 0.01 to 1.0 parts by weight of admixture A per 100 parts by weight of the mortar composition, wherein the admixture A is rigine sulfonate or polynaphthalene sulfonate. An interlayer noise prevention mortar composition comprising at least one of polymelamine sulfonate, and polycarboxylate.
The method according to claim 1,
Further comprising 0.01 to 1.0 parts by weight of admixture B per 100 parts by weight of the mortar composition, wherein the admixture B is methyl cellulose or ethyl cellulose. An interlayer noise prevention mortar composition comprising at least one of hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose.
In the mortar layer prepared from a mortar composition comprising a heavy aggregate, a binder, an admixture B, and an admixture C,
The unit volumetric weight satisfies 2500 to 2700 kg/m³ and the compressive strength at 28 days of age is 15 to 50 MPa,
The heavy aggregate includes at least one of wind chain slag, electric furnace oxide slag, copper slag, soft slag, ferronickel slag, and blast furnace slag,
The binder includes at least one of type 1 Portland cement, type 3 Portland cement, blast furnace slag fine powder, and alumina cement,
The admixture B has a fineness of 5000 to 7000 cm / g,
The admixture C is an interlayer noise prevention mortar layer comprising a lime gypsum-based expansion material.
5. The method according to claim 4,
The absolute value of the difference between the frequency of the peak point of the natural frequency (f o ) of the natural frequency (f _o ) of the floor structure including the mortar layer and the frequency of the peak point of the weight impact sound excitation frequency is 32 to 125 Hz, the interlayer noise prevention mortar layer.
5. The method according to claim 4,
The mortar composition further comprises at least one of admixture A and admixture B, wherein the admixture A is rigine sulfonate, polynaphthalene sulfonate. At least one of polymelamine sulfonate, and polycarboxylate, wherein the admixture B is methyl cellulose, ethyl cellulose. An interlayer noise prevention mortar layer comprising at least one of hydroxymethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose.
floor slab;
a first mortar layer disposed on the floor slab;
a floor cushioning material disposed on the first mortar layer; and
a second mortar layer disposed on the floor cushioning material;
including,
The first mortar layer and the second mortar layer are prepared from a mortar composition comprising a heavy aggregate, a binder, an admixture B, and an admixture C, and have a unit weight of 2500 to 2700 kg/m³ and a compressive strength based on 28 days of age is 15 to 50 MPa,
The heavy aggregate includes at least any one of wind chain slag, electric furnace oxide slag, copper slag, soft slag, ferronickel slag, and blast furnace slag, and the binder includes type 1 Portland cement, type 3 Portland cement, blast furnace slag fine powder, and at least one of alumina cement, wherein the admixture B has a fineness of 5000 to 7000 cm2/g, and the admixture C includes a lime gypsum-based expansion material.

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