KR102455699B1 - manufacturing method for formed concrete for cast-in-site with enhanced sound insulation - Google Patents

Abstract

The present invention relates to a method for manufacturing mixed foamed concrete for in-situ casting with improved sound insulation. The method for manufacturing mixed foamed concrete for in-situ casting, according to the present invention, comprises: a cement slurry preparation step; an admixture blending step; a foaming agent blending step; a lightweight aggregate blending step; and an in-situ casting and curing step. According to the present invention, homogeneous mixed foamed cement slurry or mixed foamed remitar slurry can be manufactured.

Description

Mixed foam concrete manufacturing method for cast-in-place with improved sound insulation {manufacturing method for formed concrete for cast-in-site with enhanced sound insulation}

The present invention relates to a method for manufacturing mixed aerated concrete for casting in place with improved sound insulation, and more particularly, it is the present invention that a homogeneous mortar cannot be obtained only by general stirring in mixing and using heavy and light aggregates having different specific gravity. A homogeneous mortar is provided using the admixture for mixed aerated concrete of It relates to a method for manufacturing mixed aerated concrete for cast-in-place with improved economical sound insulation that does not incur additional costs, such as re-construction and delay, by providing products that do not cause defects such as repairs and claims after completion of cast-in-place construction.

Aerated concrete for on-site pouring has been established and implemented as KS F 4039 (Notice by the National Institute of Technology and Standards), but the development of products with better quality than the quality standards of this standard continues.

Among the quality standards of the KS standard, materials with an apparent specific gravity of 0.010 or more and 0.050 or less that are classified as lightweight aggregates in non-solidified aerated concrete (hereinafter referred to as 'foam slurry') to dramatically improve thermal conductivity while maintaining compressive strength, e.g. For example, there are technologies that mix and use materials such as EPS chip, EVA chip, or polyurethane foam chip, but they are not compatible with the foam slurry, so There are many cases in which products are abandoned due to failure to make them.

In particular, a heating pipe is installed on the upper surface of the aerated concrete, and the lightweight aggregate mixed with the mixed aerated concrete is vulnerable to heat resistance and flame retardancy, which causes a problem in the durability of the floor. .

And since the prior art is supposed to meet the criteria of 0.8 N/mm ² or more for compressive strength of 0.4 and less than 0.130 W/mK for thermal conductivity among the quality regulations of aerated concrete for casting on site, there is a restriction that mixed aerated concrete must also comply with this regulation. have.

If you look at several development cases of mixed aerated concrete mixed with lightweight aggregate, if the compressive strength of the above regulations is met, the thermal conductivity is inadequate, and if the thermal conductivity is met, the compressive strength is not suitable, so it cannot be applied to field construction.

As the cause, in conventional mixed aerated concrete, cement or remital, which is a heavy aggregate, is precipitated due to the difference in specific gravity of materials, and EPS chip or EVA chip or polyurethane foam chip, which is a lightweight aggregate, is precipitated. Foam chips), etc., are considered to be caused by the phenomenon of layer separation by floating, and the fact that the mixed bubble cement slurry (or mixed bubble remittal slurry) is not homogenized.

Republic of Korea Patent Laid-Open No. 10-2015-0050874 No. "Method for manufacturing an admixture for mixed lightweight foamed concrete" (published on May 11, 2015) Republic of Korea Patent Registration No. 10-0562563 "Method for producing lightweight foam concrete composition for preventing cracks" (Registered on March 13, 2006) Republic of Korea Patent Registration No. 10-1531896 "A high-performance concrete manufacturing apparatus and its manufacturing method through the process of mixing and dissipating air bubbles and mixed materials in ordinary concrete" (Registered on June 18, 2015)

The present invention has been devised to solve the problems of the prior art as described above, and a heavy aggregate cement or remital and a lightweight aggregate EPS chip or EVA chip or polyurethane foam chip ( polyuretane foam chip) to provide a homogeneous mixed bubble cement slurry or mixed bubble remittal slurry, and provide a flow value or fluidity so that the mixed bubble cement slurry or mixed bubble remittal slurry is smoothly withdrawn through the in-situ casting equipment and heat resistance and flame retardancy to provide durable products, achieve sound insulation performance requirements of light and heavy impact sound below a certain decibel level, and provide products that meet the above KS quality regulations after on-site casting and curing. After pouring, we provide a product suitable for initial setting time of 11 to 13 hours of mixed bubble cement slurry or mixed bubble remittal slurry, and provide high-quality products without defects such as cracks, cracks, dents, and shrinkage during on-site construction. The goal is to provide eco-friendly products that do not emit environmental pollutants, and to provide economical, low-cost, and mixed aerated concrete for on-site casting with improved sound insulation performance.

In the first aspect of the present invention for solving the above problems, the method for producing mixed aerated concrete for casting with improved sound insulation is prepared by mixing 280 to 560 parts by weight of water with 400 to 800 parts by weight of cement, which is a heavy aggregate, to prepare a cement slurry. A cement slurry preparation step, and an admixture mixing step of mixing and stirring 7 to 20 parts by weight of an admixture for mixed aerated concrete to the cement slurry to form an admixture blending slurry, and 0.5 to 1.5 parts by weight of a foaming agent in the admixture blending slurry, and A foaming agent blending step of forming a foaming agent blended slurry by stirring, and an EPS chip having a specific gravity of 0.010 to 0.015, an EVA chip having a specific gravity of 0.030 to 0.040, and a poly with a specific gravity of 0.020 to 0.025 in the foaming agent blended slurry A lightweight aggregate mixing step of mixing 4 to 35 parts by weight of a lightweight aggregate, which is any one of urethane foam chips or a mixture thereof, to form a mixed aerated cement slurry, and casting and curing the mixed aerated cement slurry on site and mixing including cast-in-place and curing steps to complete the aerated concrete; The admixture for mixed aerated concrete is prepared by injecting 75 to 86 parts by weight of sodium silicate solution into a chemical reactor with respect to 100 parts by weight of the admixture for mixed aerated concrete, and as a polymerization reagent, 100 parts by weight of the admixture for mixed aerated concrete A polymerization product forming step of forming a polymerization product by mixing and stirring 3 to 6 parts by weight of sodium hydroxide (NaOH) with respect to parts by weight, and barium sulfate ( A polycondensate forming step of forming a polycondensate by mixing and stirring 9 to 21 parts by weight of Barium Sulfate), and 0.1 to 0.3 parts by weight of an antifoaming agent with respect to 100 parts by weight of the admixture for mixed aerated concrete to the polycondensate And characterized in that it was prepared by a manufacturing method comprising a stabilizing step of stirring.

In the above, the in-situ casting and curing step is to lay an EPS pad or EVA pad with a thickness of 15 to 30 mm on the top of the concrete slab floor, and apply the mixed bubble cement slurry to the upper surface of the concrete slab with a thickness of 40 It can be cast on site and cured at ~55mm.

The second aspect of the present invention for solving the above problems is a method for producing mixed aerated concrete for casting in place with improved sound insulation, by mixing 225 to 375 parts by weight of water with 600 to 1000 parts by weight of Remital, which is a heavy aggregate, to obtain a Remittal slurry. A remittal slurry preparation step of preparing A foaming agent blending step of mixing and stirring 1.5 parts by weight to form a foaming agent blended slurry, an EPS chip having a specific gravity of 0.010 to 0.015 and an EVA chip having a specific gravity of 0.030 to 0.040 and specific gravity in the foaming agent blended slurry A lightweight aggregate mixing step of forming a mixed bubble remittal slurry by mixing 3.75 to 28 parts by weight of any one of 0.020 to 0.025 polyurethane foam chips or a mixture thereof, and the mixed bubble remittal slurry; Casting in place and curing to complete the mixed aerated concrete, including casting and curing steps; The admixture for mixed aerated concrete is prepared by injecting 75 to 86 parts by weight of sodium silicate solution into a chemical reactor with respect to 100 parts by weight of the admixture for mixed aerated concrete, and as a polymerization reagent, 100 parts by weight of the admixture for mixed aerated concrete A polymerization product forming step of forming a polymerization product by mixing and stirring 3 to 6 parts by weight of sodium hydroxide (NaOH) with respect to parts by weight, and barium sulfate ( A polycondensate forming step of forming a polycondensate by mixing and stirring 9 to 21 parts by weight of Barium Sulfate), and 0.1 to 0.3 parts by weight of an antifoaming agent with respect to 100 parts by weight of the admixture for mixed aerated concrete to the polycondensate And it is characterized in that it was prepared by a manufacturing method comprising a stabilizing step of stirring.

In the above, the in-situ casting and curing step is to lay an EPS pad or EVA pad with a thickness of 15 to 30 mm on the top of the concrete slab floor, and apply the mixed bubble remittal slurry to the upper surface of the concrete slab to a thickness It can be cast on site and cured in 40~55mm.

As described above, the present invention can prepare a homogeneous mixed-celled cement slurry or mixed-celled remital slurry by mixing a lightweight aggregate having a specific gravity of 0.010 to 0.040 and a heavy aggregate, such as cement or remital, and provides heat resistance and flame retardancy for durability It is possible to provide this strong product and prevent the spread of fire, and the mixed bubble cement slurry or mixed bubble remittal slurry can be smoothly withdrawn through the cast-in-place equipment, and it is suitable for the above KS quality regulations after cast-in-place and curing, The initial setting time of mixed aerated cement slurry or mixed aerated remittal slurry after casting on site is suitable for 11 to 13 hours. Light impact sound and heavy impact sound are achieved below a certain decibel level, and no environmental pollutants are emitted during on-site construction.

1 is a flowchart showing the sequence of a method for manufacturing an admixture for mixed aerated concrete according to an embodiment of the present invention;
2 is a flow chart showing the sequence of a method for manufacturing mixed aerated concrete for casting in place with improved sound insulation using cement slurry according to an embodiment of the present invention;
Figure 3 is a flow chart showing the sequence of the mixed aerated concrete manufacturing method for in-situ casting with improved sound insulation using a remital slurry according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are given to similar parts throughout the specification.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated.

1. Method of manufacturing admixture for mixed aerated concrete

1 is a flowchart showing the sequence of a method for manufacturing an admixture for mixed aerated concrete according to an embodiment of the present invention.

As shown in the figure, the method for manufacturing an admixture for mixed aerated concrete according to an embodiment of the present invention includes a sodium silicate solution preparation step (S11), a polymerization reaction product formation step (S12), and a polycondensate formation step (S13) ) and a stabilization step (S14).

The sodium silicate solution preparation step (S11) includes 75 to 86 parts by weight of a sodium silicate solution having a viscosity of 350 to 400 and a specific gravity of 1.4 to 1.5 (in this embodiment, 750 kg to 860 kg) ( 100 parts by weight of admixture) is added, and the temperature is set to 80° C. and the stirring speed is set to 300 rpm to prepare the reaction.

The sodium silicate solution maintains the time range for self-leveling and the state of the initially mixed slurry without layer separation during the pouring of mixed aerated cement slurry or mixed aerated remittal slurry during the subsequent production of mixed aerated concrete for in-situ casting. have a function

The admixture prepared by injecting less than 75 parts by weight of sodium silicate solution, when blended with a slurry made of cement, which is a heavy aggregate, has a thin paste state. high, lowering the physical properties of mixed aerated concrete.

In addition, the admixture prepared by injecting more than 86 parts by weight of sodium silicate solution has a thick paste state when blended with a slurry made of cement, which is a heavy aggregate, and has a high degree of capture and viscosity when mixing and stirring with lightweight aggregate, and has a high flow value. It is low, which interferes with the cast-in-place work.

In the polymerization reaction product forming step (S12), 3 to 6 parts by weight of sodium hydroxide (NaOH) as a polymerization reagent in the sodium silicate solution that has undergone the preparation process in the sodium silicate solution preparation step (S11) (this embodiment is 30 kg to 60 kg) ) (relative to 100 parts by weight of admixture) is added, mixed and stirred to form a polymerization reaction product.

When sodium hydroxide as a polymerization reactant is polymerized with sodium silicate, it lowers the viscosity and induces rapid bonding with the mixed aerated cement slurry or mixed aerated remittal slurry during the subsequent production of mixed aerated concrete for in-situ casting, while water molecules in the slurry It has a function to convert the slurry into a homogeneous paste state by blending with the mixture to uniformly mix and disperse the heavy aggregate and the lightweight aggregate.

Sodium hydroxide is dissolved and reacted with sodium silicate solution to obtain a polymerization product. When the amount is less than 3 parts by weight, the solubility of sodium silicate is lowered and the solubility of barium sulfate, which will be described later, is lowered, causing a disturbance in the polycondensation reaction, and 6 parts by weight If it exceeds, the solubility of sodium silicate becomes excessively high, making it difficult to manufacture mixed aerated concrete for in-situ casting due to high viscosity, flow value, initial setting time, etc. .

In the polycondensate formation step (S13), 9 to 21 parts by weight of barium sulfate (in this embodiment, 90 kg to 210 kg) in order to impart heat resistance and flame retardancy to the polymerization product formed in the polymerization product formation step (S12) It is a process of forming a polycondensate by mixing and stirring (relative to 100 parts by weight of the admixture) to perform a polycondensation reaction.

Barium sulfate reacts with polymerization reactants to form polycondensates, giving the function of strengthening heat resistance and flame retardancy. EPS chip), EVA chip, or polyurethane foam chip, etc. to improve durability and have a fire protection function to protect from fire.

In order to express heat resistance and flame retardancy, barium sulfate is subjected to a dissolution reaction with a polymerization product to obtain a polycondensate. If it is less than 9 parts by weight, heat resistance and flame retardancy are lowered. When manufacturing mixed aerated concrete for in-situ casting, the viscosity, flow value, initial setting time, etc. are high, and the fluidity is low, making it difficult to manufacture mixed aerated concrete for casting in-situ.

In the stabilization step (S14), in order to stabilize the polycondensate formed in the polycondensate forming step (S14), 0.1 to 0.3 parts by weight (1 kg to 3 kg in this embodiment) (relative to 100 parts by weight of the admixture) of an antifoaming agent is mixed and It is a stirring process.

The antifoaming agent is a silicone antifoaming agent (manufactured by Cyanide Chemical), which is compatible with sodium silicate, and is used to stabilize the physical properties of the polycondensate by removing bubbles generated in the polymerization and polycondensation reactions.

When the amount of the antifoaming agent is less than 0.1 parts by weight, residual bubbles remain, and when the amount exceeds 0.3 parts by weight, a side reaction occurs in the proper foaming degree of the cement slurry or remittal slurry in the foaming agent mixing process during the subsequent operation, which is the production of mixed foam concrete for casting in place.

The admixture for mixed aerated concrete of the present invention is manufactured by the above process, and it is possible to develop a wide variety of products, and can be directly applied to the aerated concrete pouring equipment system used in the actual construction process. It is an important technology that can raise the quality of flooring by one level.

Hereinafter, two methods of manufacturing the mixed foam concrete for casting in place with improved sound insulation by using the admixture prepared as described above will be described.

2-1. Method for manufacturing mixed aerated concrete for cast-in-place with improved sound insulation using cement slurry

FIG. 2 is a flowchart illustrating a method for manufacturing mixed aerated concrete for in-situ casting with improved sound insulation using cement slurry according to an embodiment of the present invention.

The method for producing mixed foamed concrete for casting in place of improved sound insulation of this embodiment includes a cement slurry preparation step (S21), an admixture mixing step (S22), a foaming agent mixing step (S23), a lightweight aggregate mixing step (S24), casting and It consists of a curing step (S25).

In the cement slurry preparation step (S21), in order to prepare 1 m ³ of mixed aerated cement slurry, 400 kg to 800 kg of cement as a weight aggregate is mixed with 280 kg to 560 kg of water, that is, a weight ratio of cement to water is 1: 0.7, and Prepare the cement slurry by stirring.

In the admixture mixing step (S22), 7 kg to 20 kg of the admixture for mixed aerated concrete of the present invention is mixed and stirred with the prepared cement slurry to form an admixture mixture slurry.

In the foaming agent blending step (S23), a foaming agent blending slurry is formed by mixing and stirring 0.5 kg to 1.5 kg of a foaming agent to the admixture blending slurry.

The lightweight aggregate mixing step (S24) is, in the foaming agent blended slurry, an EPS chip having a specific gravity of 0.010 to 0.015, an EVA chip having a specific gravity of 0.030 to 0.040, and a polyurethane foam chip having a specific gravity of 0.020 to 0.025 ( polyuretane foam chip) or a mixture thereof, which is 4 to 35 parts by weight of a lightweight aggregate, to form a mixed aerated cement slurry.

Specifically, as a lightweight aggregate, 4 kg (400L) to 10.5 kg (700L) of an EPS chip having a specific gravity of 0.010 to 0.015 are blended, or an EVA chip having a specific gravity of 0.030 to 0.040 20 kg (600L) ) to 35 kg (875L), or the EPS chip 1.3 kg (130L) to 3.45 kg (230L) and the EVA chip 12 kg (400L) to 23.2 kg (580L) 13.3 kg (450L) to 26.65 kg (810L) by mixing, or 6kg (300L) to 15kg (600L) of a polyurethane foam chip having a specific gravity of 0.020 to 0.025 can be mixed.

The cast-in-place and curing step (S25) is a step of completing the mixed-aerated concrete with improved sound insulation properties by pouring the mixed-celled cement slurry in-situ and curing it.

According to the embodiment, in order to prevent heat conduction to the concrete slab floor, an EPS pad or EVA pad having a thickness of 15 to 30 mm is laid on the upper part of the concrete slab floor in advance, and the EPS pad (EPS) pad) or the upper surface of the EVA pad may be cast and cured in-situ with a thickness of 40 to 55 mm of mixed aerated cement slurry.

2-2. Method for manufacturing mixed aerated concrete for cast-in-place with improved sound insulation using remittal slurry

3 is a flow chart showing the sequence of a method for manufacturing mixed aerated concrete for casting in situ with improved sound insulation using a remital slurry according to an embodiment of the present invention.

The method for producing mixed foamed concrete for casting in place of improved sound insulation of this embodiment includes a remital slurry preparation step (S31), an admixture mixing step (S32), a foaming agent mixing step (S33), a lightweight aggregate mixing step (S34), casting in situ and a curing step (S35).

In the remital slurry preparation step (S31), in order to prepare 1 m ³ of mixed aerated cement slurry, 225 kg to 375 kg of water to 600 kg to 1000 kg of remital, that is, a weight ratio of remital: water is 1: 0.375. Prepare the remital slurry by mixing and stirring as much as possible.

In the admixture mixing step (S32), 4 kg to 8 kg of the admixture for mixed aerated concrete of the present invention is mixed with the prepared remital slurry and stirred to form an admixture blending slurry.

In the foaming agent blending step (S33), a foaming agent blending slurry is formed by mixing and stirring 0.5 kg to 1.5 kg of a foaming agent to the admixture blending slurry.

The lightweight aggregate mixing step (S34) is, in the foaming agent blended slurry, an EPS chip having a specific gravity of 0.010 to 0.015, an EVA chip having a specific gravity of 0.030 to 0.040, and a polyurethane foam chip having a specific gravity of 0.020 to 0.025 ( polyuretane foam chip) or a mixture thereof, 3.75 to 28 parts by weight of a lightweight aggregate, to form a mixed bubble remittal slurry.

Specifically, as a lightweight aggregate, 3.75 kg (375L) to 7.5 kg (500L) of an EPS chip having a specific gravity of 0.010 to 0.015 is blended, or an EVA chip having a specific gravity of 0.030 to 0.040 12 kg (400L) ) to 28 kg (700L), or 0.9 kg (90L) to 2.25 kg (150L) of the EPS chip and 7.8 kg (260L) to 18 kg (450L) of the EVA chip 8.7 kg (350L) to 20.25 kg (600L) by mixing, or 4 kg (200L) to 10 kg (400L) of a polyurethane foam chip having a specific gravity of 0.020 to 0.025 can be mixed.

The cast-in-place and curing step ( S35 ) is a step of completing the mixed-foam concrete with improved sound insulation by pouring and curing the mixed aerated remittal slurry in-situ.

According to the embodiment, in order to prevent heat conduction to the concrete slab floor, an EPS pad or EVA pad having a thickness of 15 to 30 mm is laid on the upper part of the concrete slab floor in advance, and the EPS pad (EPS) pad) or the mixed bubble remittal slurry to a thickness of 40 to 55 mm on the upper surface of the EVA pad may be cast and cured on site.

< Examples and Comparative Examples >

In order to confirm the physical properties of the mixed bubble cement slurry and the mixed bubble remittal slurry according to the present invention, the following tests were conducted.

First, the admixtures for mixed foam concrete of Examples 1 to 3 and Comparative Examples 1 to 4 were prepared with the composition (unit: kg, 100 kg each) as shown in Table 1 below.

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 sodium silicate solution 75 80 86 58 66 90 95 sodium hydroxide 3.8 3.8 4.8 10.8 7.8 2.8 1.8 barium sulfate 21 16 9 31 26 7 3 antifoam 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Sum 100 100 100 100 100 100 100

Next, in order to prepare 1 m ³ of mixed foam cement slurry, a foaming agent mixing slurry based on cement having a mixing composition ratio as shown in Table 2 was formed.

division cement water admixture foaming agent Sum Amount (kg) 600 420 10 One 1031 Compounding weight (g/L) 1600 1450

That is, 600 kg of cement was mixed with 420 kg of water and stirred to prepare a cement slurry having a cement:water weight ratio of 1:0.7, and 10 kg of each of the admixtures of Examples 1 to 3 and Comparative Examples 1 to 4 were mixed and stirred. The mixture was stirred to form a homogeneous paste-like admixture slurry having a blending weight of 1600 g/L, and each 1 kg of foaming agent was blended and stirred in the admixture blended slurry to form a foaming agent blended slurry of 1450 g/L.

Next, as shown in Table 3, 0.5 kg (about 35.7 L) of an EPS chip having a specific gravity of 0.014, which is a lightweight aggregate, was mixed with 99.5 kg of the foaming agent blended slurry of Table 2 and stirred to form mixed bubbles of 880 g/L in weight. 100 kg of cement slurry was prepared.

division Foaming agent blending slurry IPS Chip Sum Amount (kg) 99.5 0.5 100 Mixed weight (g/L) 880

The mixed cell cement slurry prepared as described above was tested for compounding weight, flow value, layer separation, fluidity, initial setting time, heat resistance and flame retardancy, and sound insulation to confirm the physical properties shown in Table 4.

< Mixed weight >

It is the average value obtained by carrying out each operation 5 times by filling 1 liter of mixed aerated cement slurry in a standard measuring cup and weighing it on a scale.

< Flow value >

After filling the mixed bubble cement slurry into a cylinder with a diameter of 80 mm and a height of 100 mm, the cylinder is lifted upward to remove it, and after 1 minute, the spread state of the mixed bubble cement slurry is measured with a standard ruler. It is the average value obtained by performing each 5 times. The appropriate flow value for in-situ casting is 180mm±20mm.

< Layer separation phenomenon >

Layer separation occurs when 1 liter of mixed aerated cement slurry is filled in a standard measuring cup and left for 1 hour (working time required for in-situ casting is more than 1 hour from the formation of mixed aerated cement slurry), As the result of visually measuring the presence or absence of delamination, it is an average value obtained by performing each five times.

< Liquidity >

Fluidity is obtained by placing the lower end of a cylinder with a diameter of 80 mm and a height of 1 m on a separator plate, filling the cylinder with mixed aerated cement slurry, and after 10 minutes have elapsed, the separator plate is removed, and the mixture filled in the cylinder It is a value obtained by measuring the time until the mixed foamed cement slurry completely falls from the cylinder by free-falling the foamed cement slurry, and is an average value obtained by performing each of the five times. The suitability was judged based on the standard time of free fall of the mixed aerated cement slurry of 6 sec ± 2 sec.

< Initial setting time >

The initial setting time is an average value obtained by filling a specimen mold with a width of 300 mm, a length of 300 mm, and a thickness of 50 mm with the mixed aerated cement slurry, and measuring the initial setting time at room temperature, respectively, 5 times. Conformity was judged based on the normal initial setting time of 12 hours ± 1 hour for concrete curing.

< Heat resistance and flame retardancy >

For heat resistance and flame retardancy, the mixed aerated cement slurry is filled in a specimen mold with a width of 220 mm, a length of 220 mm, and a thickness of 30 mm, and after curing for 28 days at room temperature, the cured specimen is put into a heating oven set at a set temperature of 450 ° C. It is the result of observing the state by heating.

< Sound insulation >

For sound insulation, a test mold having a width of 1 m, a length of 1 m, and a thickness of 70 mm is provided, and an EPS pad or EVA pad having a thickness of 20 mm is laid on the bottom of the test mold, and mixed air cement is placed on the upper surface of the test mold. After filling the slurry to a thickness of 50 mm, leveling the surface to produce a 70 mm thick test piece, and curing for 28 days, the light impact sound and the heavy impact sound were measured according to the test methods of KS F 2810-1 and KS F 2810-2. , it was judged whether it was suitable for the standard of less than 58dB of light impact sound and less than 50dB of heavy impact sound.

Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4
Mixed Aerated Cement Slurry Weight (g/L) 840 790 730 950 910 650 620 Flow value (mm) 173 181 195 140 156 207 216 Layer separation (1hr) fitness fitness fitness incongruity incongruity incongruity incongruity
Fluidity (sec) 7.5 6 4.5 13.5 12 3 3.5 Initial setting time (hr) 11 12 13 9 10 16 14 Heat resistance and flame retardancy (450℃, 10min) fitness fitness fitness fitness fitness incongruity incongruity
sound insulation
(dB) light impact sound 50 46 53 61 59 55 54 heavy impact sound 45 44 47 54 52 51 51

Regarding the flow value, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding the layer separation phenomenon, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding fluidity, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding the initial setting time, Examples 1 to 3 are suitable, but Comparative Examples 1 and 2 are not suitable because they are fast-setting, and Comparative Examples 3 and 4 are not suitable because of their delay.

With respect to heat resistance and flame retardancy, Examples 1 to 3 and Comparative Examples 1 and 2 were suitable, but Comparative Examples 3 and 4 were not suitable. In Comparative Examples 3 and 4, it was found that the EPS chip mixed in the mixed aerated cement slurry melted and had surface damage, so heat resistance and flame retardancy were insufficient, and it was found to be unsuitable as mixed aerated concrete.

In terms of sound insulation related to light impact sound, Examples 1 to 3 and Comparative Examples 3 and 4 were suitable, but Comparative Examples 1 and 2 were not suitable.

Examples 1 to 3 were suitable for sound insulation related to weight impact sound, but Comparative Examples 1 to 4 were all unsuitable.

When the test results for each of the above items are comprehensively evaluated for the in-situ casting process, it can be confirmed that Examples 1 to 3 are suitable as an admixture for mixed aerated concrete, and Example 2 is the most preferable.

In order to evaluate the physical properties of the mixed bubble remittal slurry, 100 kg of each of the admixtures shown in Table 1 was prepared.

Next, in order to prepare 1 m ³ of mixed bubble remital slurry, a foaming agent formulation slurry based on Remital having a mixing composition ratio as shown in Table 2 was formed.

division Remittal water admixture foaming agent Sum Amount (kg) 800 300 6 One 1107 Mixed weight (g/L) 1850 1600

That is, 800 kg of Remital was mixed with 300 kg of water and stirred to prepare a Remital slurry having a weight ratio of Remital:water of 1:0.375, and 6 kg of the admixtures of Examples 1 to 3 and Comparative Examples 1 to 4 were added thereto, respectively. Each was mixed and stirred to form a homogeneous paste-like admixture blending slurry with a blending weight of 1850 g/L, and each 1 kg of foaming agent was blended and stirred in the admixture blending slurry to form a foaming agent blended slurry of 1600 g/L.

Next, as shown in Table 6, 0.5 kg (about 35.7 L) of an EPS chip having a specific gravity of 0.014, which is a lightweight aggregate, was mixed with 99.5 kg of the foaming agent blended slurry of Table 5 and stirred to form mixed bubbles with a combined weight of 950 g/L 100 kg of remital slurry was prepared.

division Foaming agent blending slurry IPS Chip Sum Amount (kg) 99.5 0.5 100 Mixed weight (g/L) 950

The mixed bubble remittal slurry prepared in this way was tested for compounding weight, flow value, layer separation, fluidity, initial setting time, heat resistance and flame retardancy, and sound insulation as described above to confirm the physical properties shown in Table 7 .

Item Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4
Mixed Aerated Cement Slurry Weight (g/L) 1020 950 875 1090 1050 820 780 Flow value (mm) 172 185 197 149 158 210 223 Layer separation (1hr) fitness fitness fitness incongruity incongruity incongruity incongruity
Fluidity (sec) 8 6.5 5 15 13.5 3.2 3.8 Initial setting time (hr) 11.5 12 12.5 8 9 15.5 14.5 Heat and flame resistance (450℃, 10min) fitness fitness fitness fitness fitness incongruity incongruity
sound insulation
(dB) light impact sound 49 47 51 63 61 58 56 heavy impact sound 44 43 45 52 52 51 51

Regarding the flow value, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding the layer separation phenomenon, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding fluidity, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable.

Regarding the initial setting time, Examples 1 to 3 were suitable, but Comparative Examples 1 to 4 were all unsuitable. Comparative Examples 1 and 2 were unsuitable because they were fast-connected, and Comparative Examples 3 and 4 were unsuitable because they were delayed.

With respect to heat resistance and flame retardancy, Examples 1 to 3 and Comparative Examples 1 and 2 were suitable, but Comparative Examples 3 and 4 were not suitable. In Comparative Examples 3 and 4, it was found that the EPS chip blended in the mixed aerated remittal slurry melted and had surface damage, so heat resistance and flame retardancy were insufficient, and it was found to be unsuitable as mixed aerated concrete.

In terms of sound insulation related to light impact sound, Examples 1 to 3 and Comparative Examples 3 and 4 were suitable, but Comparative Examples 1 and 2 were not suitable.

Examples 1 to 3 were suitable for sound insulation related to weight impact sound, but Comparative Examples 1 to 4 were all unsuitable.

When the test results for each of the above items are comprehensively evaluated for the in-situ casting process, it can be confirmed that Examples 1 to 3 are suitable as an admixture for mixed aerated concrete, and Example 2 is the most preferable.

Next, a 20mm thick EPS pad or EVA pad is laid on the lower end of the test mold having a width of 1m, a length of 1m, and a thickness of 70mm, and on the upper surface, the mixture prepared in Example 3 of Table 1 The mixed bubble cement slurry of Table 3 and the mixed bubble remital slurry of Table 6 prepared by mixing

The specimen was demolded from the test mold after 3 days, and cured for 28 days to complete mixed aerated concrete.

The cured mixed aerated concrete test specimen satisfies the standards of each test item in Tables 4 and 7, and was not inferior to the mixed aerated concrete for cast-in-place with improved sound insulation.

As confirmed through the test results so far, cement or remittal as heavy aggregate and EPS chip or EVA chip or polyurethane foam chip as lightweight aggregate In blending, the admixture for mixed aerated concrete of the present invention is blended with water of cement slurry or remittal slurry, respectively, to convert the slurry into a paste, collect lightweight aggregates, and mix evenly in the slurry. It can be seen that by promoting the hydration reaction, it gives the function of forming excellent foamed concrete for cast-in-place.

In addition, it can be seen that the heat resistance and flame retardancy of the admixture for mixed aerated concrete of the present invention has the effect of improving the durability of mixed aerated concrete and blocking harmful factors from fire occurring in mixed aerated concrete and residential space as much as possible. .

In addition, it can be seen that the mixed aerated concrete of the present invention achieves both the light impact sound and the heavy impact sound, which are sound insulation performance requirements, below a certain decibel, so that it has very improved sound insulation properties.

The above description of the present invention is for illustration, and those of ordinary skill in the art to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the above description is illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a dispersed form, and likewise components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

Claims (4)

A cement slurry preparation step of preparing a cement slurry by blending 280 to 560 parts by weight of water to 400 to 800 parts by weight of cement as a weight aggregate, and 7 to 20 parts by weight of an admixture for mixed aerated concrete to the cement slurry and stirring to mix and stir the admixture slurry An admixture mixing step of forming chip), an EVA chip having a specific gravity of 0.030 to 0.040, and a polyurethane foam chip having a specific gravity of 0.020 to 0.025 or 4 to 35 parts by weight of a lightweight aggregate that is a mixture thereof a light aggregate mixing step of forming a slurry; and an in-situ casting and curing step of casting and curing the mixed aerated cement slurry to complete the mixed aerated concrete;
The admixture for mixed aerated concrete, 75 to 86 parts by weight of sodium silicate solution based on 100 parts by weight of the admixture for mixed aerated concrete, is injected into a chemical reactor, and the admixture for mixed aerated concrete is 100 parts by weight as a polymerization reagent. A polymerization product forming step of forming a polymerization product by mixing and stirring 3 to 6 parts by weight of sodium hydroxide (NaOH) with respect to parts by weight, and barium sulfate ( A polycondensate forming step of forming a polycondensate by mixing and stirring 9 to 21 parts by weight of Barium Sulfate), and 0.1 to 0.3 parts by weight of an antifoaming agent with respect to 100 parts by weight of the admixture for mixed aerated concrete to the polycondensate and those prepared by a manufacturing method comprising a stabilizing step of stirring;
A method for manufacturing mixed aerated concrete for in-situ casting with improved sound insulation, characterized in that
The method of claim 1,
In the in-situ casting and curing step, an EPS pad or EVA pad having a thickness of 15 to 30 mm is laid on the top of the concrete slab floor, and the mixed bubble cement slurry is placed on the top surface to a thickness of 40 to 55 mm. A method for manufacturing mixed aerated concrete for in-situ casting with improved sound insulation, characterized in that it is poured and cured.
A remital slurry preparation step of preparing a remital slurry by mixing 225 to 375 parts by weight of water with 600 to 1000 parts by weight of remital, which is a heavy aggregate, and 4 to 8 parts by weight of an admixture for mixed aerated concrete to the remital slurry; An admixture mixing step of forming an admixture blending slurry by stirring, a foaming agent blending step of mixing and stirring 0.5 to 1.5 parts by weight of a foaming agent to the admixture blending slurry to form a foaming agent blended slurry, and a specific gravity of 0.010 to 0.015 in the foaming agent blended slurry Any one of an EPS chip, an EVA chip having a specific gravity of 0.030 to 0.040, and a polyurethane foam chip having a specific gravity of 0.020 to 0.025, or a mixture thereof 3.75 to 28 parts by weight of a lightweight aggregate a light aggregate mixing step of mixing to form a mixed aerated remittal slurry, and an in-situ casting and curing step of casting and curing the mixed aerated remittal slurry to complete the mixed aerated concrete;
The admixture for mixed aerated concrete is prepared by injecting 75 to 86 parts by weight of sodium silicate solution into a chemical reactor with respect to 100 parts by weight of the admixture for mixed aerated concrete, and as a polymerization reagent, 100 parts by weight of the admixture for mixed aerated concrete A polymerization product forming step of forming a polymerization product by mixing and stirring 3 to 6 parts by weight of sodium hydroxide (NaOH) with respect to parts by weight, and barium sulfate ( A polycondensate forming step of forming a polycondensate by mixing and stirring 9 to 21 parts by weight of Barium Sulfate), and 0.1 to 0.3 parts by weight of an antifoaming agent with respect to 100 parts by weight of the admixture for mixed aerated concrete to the polycondensate and those prepared by a manufacturing method comprising a stabilizing step of stirring;
A method for manufacturing mixed aerated concrete for in-situ casting with improved sound insulation, characterized in that
4. The method of claim 3,
In the field casting and curing step, an EPS pad or EVA pad having a thickness of 15 to 30 mm is laid on the upper part of the concrete slab floor, and the mixed bubble remittal slurry is applied to the upper surface of the concrete slab to a thickness of 40 to 55 mm. A method of manufacturing mixed aerated concrete for cast-in-place with improved sound insulation, characterized in that it is cast in place and cured.

Images