KR200372105Y1 - Interior and exterior materials for construction made by drying and curing lightweight concrete and its mixture - Google Patents

Interior and exterior materials for construction made by drying and curing lightweight concrete and its mixture Download PDF

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KR200372105Y1
KR200372105Y1 KR20-2004-0016968U KR20040016968U KR200372105Y1 KR 200372105 Y1 KR200372105 Y1 KR 200372105Y1 KR 20040016968 U KR20040016968 U KR 20040016968U KR 200372105 Y1 KR200372105 Y1 KR 200372105Y1
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mixture
lightweight concrete
concrete
interior
particles
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KR20-2004-0016968U
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Korean (ko)
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오은영
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오은영
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/12Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/18Separately-laid insulating layers; Other additional insulating measures; Floating floors
    • E04F15/20Separately-laid insulating layers; Other additional insulating measures; Floating floors for sound insulation
    • E04F15/206Layered panels for sound insulation

Abstract

본 고안은 건축물의 층간에 사용되는 경량콘크리트와 그 혼합물을 건조, 경화하여 구성한 건축용 내,외장판넬에 관한 것으로써, 보다 상세하게는 기존의 경량콘크리트를 제조하기 위한 재료인 시멘트와 모래의 혼합물에 자연석발포입자인 진주암발포입자와 질석발포입자를 혼합하여 경량콘크리트를 제조하므로써 기포제를 사용하지 않고도 비중이 아주 낮고, 강도가 강하며, 열전도율이 낮은 경량콘크리트를 제조할 수 있는 고안이다. 또한 상기의 혼합재료를 이용하여 건축용 내, 외장판넬을 제조하므로써 화재시에도 안전한 완전불연성의 판넬을 제공할 수 있도록 한 내용의 고안이다.The present invention relates to a building interior and exterior panel composed by drying and curing lightweight concrete and its mixture used in the interlayer of buildings, and more specifically, to a mixture of cement and sand, which is a material for manufacturing existing lightweight concrete. By producing light concrete by mixing pearlite foam particles and vermiculite foam particles, which are natural stone foam particles, it is designed to produce lightweight concrete with low specific gravity, strong strength and low thermal conductivity without using foaming agent. In addition, by using the above-mentioned mixed materials to manufacture the interior and exterior panels for construction, the invention is designed to provide a completely non-flammable panel even in the event of fire.

Description

경량콘크리트 및 그 혼합물을 건조, 경화하여 구성한 건축용 내,외장재{omitted}Interior and exterior materials for construction made by drying and curing lightweight concrete and mixtures thereof

본 고안은 건축물의 층간에 사용되는 관한 것으로써, 보다 상세하게는, 기존의 경량콘크리트를 제조하기 위한 재료인 시멘트에 자연석발포입자인 진주암발포입자와 질석발포입자를 혼합하여 경량콘크리트를 제조하므로써 기포제를 사용하지 않고도 비중이 아주 낮고, 강도가 강하며, 열전도율이 낮은 경량콘크리트를 제조할 수 있는 고안이다. 또한 상기의 혼합재료를 이용한 건조, 경화하여 건축용 내, 외장재를 제조하므로써 화재시에도 안전한 완전불연성의 건축용 내,외장재을 제공할 수 있도록 한 내용의 고안이다.The present invention is to be used between the floors of the building, and more specifically, the foaming agent by producing light concrete by mixing natural rock foam particles and pearlite foam particles and vermiculite foam particles in cement, which is a material for manufacturing existing lightweight concrete It is designed to produce lightweight concrete with very low specific gravity, strong strength and low thermal conductivity without using. In addition, the invention is designed to provide a completely non-flammable building interior and exterior materials for the fire by manufacturing the interior and exterior materials for building by drying and curing using the above mixed materials.

일반적으로 아파트, 공동주택, 고층빌딩 등의 다층구조를 갖는 건축물의 시공시 층과 층을 구획하는 슬라브는 철근 콘크리트 구조를 형성하게 된다. 다층 건물의 층간 바닥층을 형성하는 슬라브층과 그 상단에 건축물의 층과 층 사이의 소음을 줄이기 위한 흠음재, 상기 흡음재의 상단에 난방용 배관의 열손실을 줄이도록 타설되는 경량콘크리트와 칸을 구획하고, 방음과 보온의 목적으로 건물의 내, 외부에 설치하는 건축용 내,외장판넬에 관한 고안으로, 상기 아파트, 공동주택, 고층빌딩의 층간을 구성하는 경량콘크리트층의 일반적인 시공방법을 알아보면 다음과 같다.In general, when building a multi-layered building, such as apartments, multi-unit houses, high-rise buildings, the slab partitioning the floor and form a reinforced concrete structure. The slab layer forming the inter-floor floor of the multi-story building, and the flap material to reduce the noise between the floor and the floor of the building, and the lightweight concrete and compartments are placed on the top of the sound absorbing material to reduce the heat loss of the heating pipe. Designed for the interior and exterior panels for building to be installed inside and outside the building for the purpose of sound insulation and insulation, and the general construction method of the light concrete floor constituting the floors of the apartment, multi-unit housing, high-rise building same.

도1은 일반적인 다층건물의 층과 층을 구획하도록 건물의 바닥면을 형성하는 슬라브층(1)과 이 슬라브층의 상방으로 매설되는 난방용 배관(2)을 보온시키도록 타설되는 경량콘크리트층(3)과, 경량콘크리트층에 적층되어 난방용 배관을 매설시키는 마감층(4)과 전술한 슬라브층과 경량콘크리트층 사이에 매설되어 건물의 내부에서 발생되는 소음과 진동이 슬라브층을 통하여 아래층에 전달되는 것을 차단하는 흡음재(5)로 시공된다.1 is a light concrete layer (3) which is poured to insulate a slab layer (1) forming a floor of a building to partition a floor and a floor of a general multi-story building, and a heating pipe (2) buried above the slab layer. ), And the finishing layer (4) laminated to the lightweight concrete layer to bury the heating pipe and buried between the above-described slab layer and the lightweight concrete layer to transmit noise and vibration generated inside the building to the lower floor through the slab layer. It is constructed with a sound absorbing material (5) to block the thing.

상기에 있어, 경량콘크리트에 관한 종래의 기술로는,In the above, in the conventional technology related to lightweight concrete,

공개특허 2000-0053825인 폐스치로폼을 분쇄하고, 이를 아크릴 공중합체, 칼슘설포알루미네이트와 혼합하고, 건조하여 소디움라우랄 설페이트, 알루미늄분말, 시멘트, 미분규사와 혼합한 것을 특징으로 하는 프리믹스형 경량단열콘크리트.Premix-type light insulation, which is pulverized waste styrofoam of the Patent Publication No. 2000-0053825, mixed with an acrylic copolymer, calcium sulfoaluminate, and dried and mixed with sodium laural sulfate, aluminum powder, cement and fine powder sand. concrete.

등록실용신안 200344480인, 셀룰로스화이버 시멘트보드와 보드 사이에 시멘트, 스티로폼입자, 기포체, 유동화제 및 조강제를 혼합하여 제조한 스티로폼 혼합 기포콘크리트몰타르를 직접 타설하고, 양생 후 탈형시켜 제조한 경량기포콘크리트 등이 있다. 그러나 종래의 기술에 있어서는 경량콘크리트에 혼합되는 혼합물질이 화학원료로 구성된 것이 대부분이므로, 생산시 환경오염을 일으키는 공해물질과 사용 후 환경을 오염시키는 폐기물을 양산하게 된다. 또한 화재시에 연소되므로써 유해가스와 화재를 대형화 시키게 된다.Registered utility model 200344480, Lightweight foam manufactured by directly pouring styrofoam mixed foamed concrete mortar prepared by mixing cement, styrofoam particles, foam, fluidizing agent, and crude agent between cellulose fiber cement board and board. Concrete and the like. However, in the prior art, since the mixture mixed in the light concrete is mostly composed of chemical raw materials, it produces mass pollutants that cause environmental pollution during production and waste that pollutes the environment after use. In addition, by burning during the fire, harmful gases and fires are enlarged.

또 본 고안에 따른 발포진주암입자 및 발포질석입자를 시멘트와 혼합하여 시공면에 타설하므로써 발포성원료를 첨가하여 제조한 경량콘크리트의 단점인 원료의 혼합과 타설에 계산된 정확한 시공시점이 필수적으로 지켜져야한다는 시간적인 제약을 없앨 수 있는 큰 장점이 있다.In addition, the precise construction time calculated for the mixing and pouring of raw materials, which is a disadvantage of lightweight concrete prepared by adding foamable raw materials, is essential by mixing foamed pearl rock particles and foamed vermiculite particles with cement. There is a big advantage that can remove the time constraint.

이는 시공비를 절약할 수 있는 장점이 있으며, 제조와 시공에 제약을 주던 종래의 혼합, 타설의 시기를 시공자 입장에서 임의로 결정하는 것을 가능하게 해준다.This has the advantage of saving construction costs, and allows the builder to arbitrarily determine the timing of mixing and placing the conventional mixing and placing, which has restricted manufacturing and construction.

또한 건축용 내,외장재에 관하여도 상기와 같이 생산시 환경오염을 일으키는 공해물질과 사용 후 환경을 오염시키는 폐기물을 감소시키고, 또한 불연재료를 사용하였으므로 화재의 인화를 막아 화재의 피해를 최소화하는데 큰 장점을 제공하게 된다.In addition, as for the interior and exterior materials for construction, it is possible to reduce the pollution that causes environmental pollution during production and the waste that pollutes the environment after use, and also because it uses non-combustible materials, it is a great advantage in minimizing the damage of fire by preventing the fire from burning. Will be provided.

이에 본 고안에서는 상기와 같은 종래의 경량콘크리트의 문제점이 해소된 경량콘크리트 및 그 혼합물을 건조, 경화하여 건축용 내,외장재를 제공하기 위하여, 발포진주암입자 및 발포질석입자를 원료로 하여, 불연성을 갖도록 설계하며, 자연에서 채취한 발포성암성을 사용하므로써 제조시 환경공해를 유발하지 않으며, 사용 후 폐기물에 의한 환경오염을 유발하지 않고, 발포체이므로 내부에 기공이 형성되어 단열성이 높아 보온의 효과가 높고, 발포 후의 물성이 단단하므로써 사용 중 침하가 발생하지 않는다. 또한 주 원료인 시멘트와 종래의 스치로폼과 고무원료 분쇄물을 첨가하여 제조한 경우에 초래되는 시멘트와 분쇄물이 고르게 혼합되지 못하여 원활히 접착을 일으키지 못하고, 첩촉면이 타 재료와 분리되는 현상이 나타내는 단점도 제거되게 된다. 이는 본 고안에 따른 상기 원료들 간에 친화도가 높아 쉽게 접착되는 장점을 이용한 것이다. 또한 상기 발포성 원료들의 비중이 낮아 아주 가벼운 경량콘크리트를 제공할 수 있는 장점을 갖고 있다. 이는 종래의 경량콘크리트 및 그 혼합물을 이용한 건축용 내,외장재을 대체할 수 있는 고안이다.Therefore, in the present invention, in order to provide the interior and exterior materials for building by drying and curing the lightweight concrete and its mixture, which have been solved the problems of the conventional lightweight concrete as described above, the foamed pearl rock particles and the expanded calcite particles are used as raw materials, so as to have non-combustibility. It is designed, and it does not cause environmental pollution during manufacturing by using effervescent rock collected from nature, and it does not cause environmental pollution by waste after use, and because it is a foam, pores are formed inside, so it has high thermal insulation effect, Hardness during foaming prevents settling during use. In addition, the cement and the crushed product, which are produced when the main raw material cement and the conventional styrofoam and the rubber pulverized product are added, are not mixed evenly, and thus the adhesion surface is separated from other materials. Will also be removed. This is to take advantage of the high affinity between the raw materials according to the present invention is easily bonded. In addition, the low specific gravity of the foamable raw material has the advantage that can provide a very light weight concrete. This is a design that can replace the interior and exterior materials for construction using conventional lightweight concrete and mixtures thereof.

상기에서 발포진주암입자 및 발포질석입자는 광석의 일종인 진주암과 질석을 분쇄하고, 상기 분쇄된 입자를 발포시켜 경량화하고, 기포제를 첨가하거나 또는 기포제를 첨가하지 않은 시멘트에 상기 발포된 진주암입자 및 질석입자를 단독 또는 혼용하여 혼합한다.In the above-mentioned foamed pearlite and vermiculite particles, the pearlite and vermiculite, which is a kind of ore, are pulverized, the foamed and lightweighted by pulverizing the pulverized particles, and the foamed pearlite and vermiculite are added to a cement having no foaming agent or foaming agent. The particles are mixed alone or in combination.

상기에 경량콘크리트의 비중을 더욱 감소시키기 위하여 스치로폼공중합발포비즈를 추가로 혼합하여 경량콘크리트 및 그 혼합물을 건조, 경화하여 건축용 내,외장재를 제조할 수 있다.In order to further reduce the specific gravity of the light concrete, the styrofoam copolymer foam beads may be further mixed to dry and harden the light concrete and the mixture thereof to manufacture interior and exterior materials for construction.

상기에서 발포입자와 시멘트의 혼합비율은 시공목적과 강도에 따라 적절히 조절할 수 있으며, 상기 발포입자의 혼합비율이 높아짐에 따라 전체 경량콘크리트의 비중은 낮아지게 된다.The mixing ratio of the foam particles and cement can be appropriately adjusted according to the construction purpose and strength, and as the mixing ratio of the foam particles is increased, the specific gravity of the entire lightweight concrete is lowered.

그러나 강도를 고려하여 적절한 비율로 혼합하여 제조하는 것이 바람직하다.However, considering the strength, it is preferable to prepare by mixing in an appropriate ratio.

도1은 경량콘크리트 시공도.Figure 1 is a construction of lightweight concrete.

도2,3,4는 본 고안의 실시예.2, 3, and 4 is an embodiment of the present invention.

상기의 목적을 달성하기 위하여,In order to achieve the above object,

본 고안에 따른 실시예를 들어 상세히 설명한다.An embodiment according to the present invention will be described in detail.

도2은 광석의 일종인 진주암과 질석을 분쇄하고, 분쇄된 입자를 섭씨 1000도씨~1200도씨로 소성하여 진주암 및 질석의 입자에 기공을 형성시킨 후, 냉각하여 비중이 0.01이하인 진주암 및 질석의 발포입자를 제조한다. 상기와 같은 방법으로 제조한 발포입자들을 단독 또는 혼용하여 시멘트, 물과 혼합(mixing)하여 본 고안에 따른 경량콘크리트를 제조하게 된다.Figure 2 is a kind of ore pulverized and vermiculite, and pulverized the pulverized particles 1000 ℃ ~ 1200 degrees Celsius to form pores in the particles of pearl rock and vermiculite, and then cooled to pearlstone and vermiculite having a specific gravity of less than 0.01 Prepare foamed particles of Foamed particles prepared by the above method alone or mixed to mix with cement, water (mixing) to produce a lightweight concrete according to the present invention.

도3는 시멘트에 발포기공을 형성하기 위하여 기포제를 혼합한 시멘트에 상기와 같은 방법으로 제조한 진주암발포입자 또는 질석발포입자 또는 상기 두 발포입자들을 혼합한 원료를 혼합하여 경량콘크리트를 제조한다.Figure 3 is to prepare a lightweight concrete by mixing pearl rock foam particles or vermiculite foam particles or the raw material of the two foam particles mixed in the cement mixed with the foaming agent to form foam pores in the cement.

이는 상기에 진주암발포입자와 질석발포입자만을 시멘트에 혼합하여 제조한 경량콘크리트보다 단위 중량을 가볍게 하기 위한 방법이다.This is a method for lightening the unit weight than light concrete prepared by mixing only the pearlite foam particles and vermiculite foam particles in cement.

도4은 상기의 두 실시예에 따라 제조될 경량콘크리트의 혼합재료들의 혼합(mixing)시에 스치로폼공중합발포비즈를 함께 혼합하여 경량콘크리트를 제조한다.Figure 4 is mixed with the styrofoam copolymer foam beads at the time of mixing (mixing) of the mixed materials of lightweight concrete to be produced according to the above two embodiments to produce a lightweight concrete.

이 때 스치로폼공중합발포비즈를 타 혼합물과 혼합하는 경우에 있어서, 상기 혼합물에 물을 투입하기 전(前) 과정에서 타 혼합물과 스치로폼공중합발포비즈를 혼합하여야 상기 스치로폼공중합발포비즈가 타 혼합물과 고루 혼합되어 본 고안에 따른 효과를 원활히 수행 할 수 있는 제품을 제조할 수 있다.At this time, when the styrofoam copolymer foam beads are mixed with the other mixture, the other mixture and the styrofoam copolymer foam beads must be mixed before the water is added to the mixture before the styrofoam copolymer foam beads are evenly mixed with the other mixture. It can be produced a product that can smoothly perform the effect according to the present invention.

상기에서 물을 투입한 후(後)단계에서 스치로폼공중합발포비즈를 혼합하게 되면 발포비즈의 입자의 비중이 물보다 낮은 관계로 물위에 뜨게 되어 타 혼합물과혼합에 어려움이 발생하게 되므로 반드시 물을 투입하기 전(前)단계에서 혼합하도록 한다.After mixing water in step (후), if Schirofoam co-foaming beads are mixed, the specific gravity of the foam beads is lower than that of water so that it floats on the water, causing difficulty in mixing with other mixtures. Mix before the next step.

이와 같이 스치로폼공중합발포비즈를 혼합하는 원인은 제품의 중량을 더욱 감소시키고, 방음과 단열의 효과가 상승되는 장점이 있기 때문이다. 또한 상기 혼합물 간의 결합력을 높이기 위하여, 유,무기 바인더를 첨가하여 경량콘크리트를 제조한다.The reason for mixing the styrofoam copolymer foam beads is because the weight of the product is further reduced, and the effects of sound insulation and insulation are increased. In addition, in order to increase the bonding strength between the mixture, by adding an organic, inorganic binder to produce a light concrete.

상기 도2,3,4의 실시예에 따라 제조한 경량콘크리트는 시공현장에 타설하여 경량콘크리트층(3)을 구성한다.Lightweight concrete prepared according to the embodiment of Figs. 2, 3, and 4 is placed in the construction site to form a light concrete layer (3).

도4는 상기 경량콘크리트를 제조하기 위하여 혼합한 혼합물을 건축용 내,외장재로 사용할 수 있도록 하기 위하여, 상기 1,2,3과 같은 방법으로 혼합한 경량콘크리트 혼합물을 제조하고자 하는 형상의 성형틀에 투입하고, 상온에서 장시간 또는 고온에서 단시간 양생하여 경화시켜 건축용 내,외장재을 제조한다.Figure 4 is put into a molding frame of the shape to be prepared in the same way as to prepare the light-weight concrete mixture mixed in the same manner as 1,2,3 in order to be used as a building interior, exterior material for the construction of the light concrete And curing for a long time at room temperature or short time at high temperature to harden to prepare the interior and exterior materials for construction.

본 고안에 의해 제조한 경량콘크리트와 건축용 내,외장재은 발포진주암입자 및 발포질석입자를 원료로 하여 제조하였으므로, 불연성이며, 자연에서 채취한 발포성암성을 사용하므로써 제조시 환경공해를 유발하지 않으며, 사용 후 폐기물에 의한 환경오염을 유발하지 않고, 단열성이 높아 보온의 효과가 높고, 물성이 단단하므로써 사용 중 침하가 발생하지 않는다. 또한 시멘트와 혼합시에 종래의 스치로폼과 고무원료를 분쇄물를 첨가하여 제조한 경우와 같이 시멘트와 고르게 혼합되어 접착을 일으키지 못하고, 첩촉면이 타 재료와 분리되는 현상이 나타내는 단점도 제거되게 된다. 또한 상기 발포성 원료들의 비중이 낮아 아주 가벼운 경량콘크리트를 제공할 수 있는 장점을 갖고 있다. 이는 종래의 경량기포콘크리트와 건축용 내,외장재를 대체할 수 있는 환경친화적인 고안이 되는 것이다.The lightweight concrete manufactured by the present invention and the interior and exterior materials for building are manufactured from foamed pearl rock particles and foamed vermiculite particles as raw materials. Therefore, they are nonflammable and do not cause environmental pollution during production by using foamed rock collected from nature. It does not cause environmental pollution by waste, high thermal insulation, high thermal insulation effect, and hard physical properties, so that no settlement occurs during use. In addition, when mixing with cement as in the case of manufacturing the conventional styrofoam and rubber raw materials by adding a crushed product, evenly mixed with the cement does not cause the adhesion, the disadvantage that the phenomenon that the contact surface is separated from other materials is also eliminated. In addition, the low specific gravity of the foamable raw material has the advantage that can provide a very light weight concrete. This is an environmentally friendly design that can replace the conventional lightweight foam concrete and interior and exterior materials for construction.

Claims (3)

다층 건물의 층간 바닥층을 형성하는 슬라브층과 그 상단에 흠음재, 상기 흡음재와 슬라브층의 사이에 타설되는 난방용 배관의 열손실을 줄이도록 타설되는 경량콘크리트에 있어서, 광석의 일종인 진주암과 질석을 분쇄하고, 분쇄된 입자를 소성하여 진주암 및 질석의 입자에 기공을 형성시킨 후, 냉각하여 제조한 진주암발포입자 및 질석의 발포입자를 단독 또는 혼용하여 시멘트, 물과 함께 혼합하여 혼합물을 구성하고, 상기 혼합물을 형틀에 주입하여 건조, 경화하여 원하는 형상으로 구성한 것을 특징으로 한 경량콘크리트 및 그 혼합물을 건조, 경화하여 구성한 건축용 내, 외장재.In the lightweight concrete that is laid to reduce the heat loss of the slab layer forming the interlayer floor of the multi-story building and the flaw material on the top, and the heating pipe placed between the sound absorbing material and the slab layer, pearlite and vermiculite, which are a kind of ore, Pulverize and pulverize the pulverized particles to form pores in the particles of pearlite and vermiculite, and then mix them together with cement and water by mixing pearlite foamed particles and vermiculite foams prepared by cooling alone or mixed, Light-weight concrete, characterized in that the mixture is injected into the mold and dried, cured to a desired shape, and the building interior and exterior materials composed by drying and curing the mixture. 제 1항에서,In claim 1, 상기 경량콘크리트의 혼합물의 제조 단계 중, 물이 투여되기 전 단계에서 추가로 스치로폼공중합발포비즈와 각 혼합재료들 간의 결합력을 높이기 위하여 유,무기 접착제를 첨가하여 혼합하여 혼합물을 구성하고, 상기 혼합물을 형틀에 주입하여 건조, 경화하여 원하는 형상으로 구성한 것을 특징으로 한 경량콘크리트 및 그 혼합물을 이용한 건축용 내,외장재.During the preparation of the mixture of lightweight concrete, in order to increase the bonding strength between the styrofoam copolymer foam beads and each of the mixed materials at the stage before the water is administered, an organic and inorganic adhesive is added and mixed to form a mixture, and the mixture is Interior and exterior materials for construction using lightweight concrete and mixtures thereof, characterized in that it is injected into the mold, dried and cured to form a desired shape. 제 1항 또는 2항에 있어서,The method according to claim 1 or 2, 시멘트에 발포기공을 형성하기 위하여 기포제를 첨가하여 혼합물을 구성하고, 상기 혼합물을 형틀에 주입하여 건조, 경화하여 원하는 형상으로 구성한 것을 것을 특징으로 한 경량콘크리트 및 그 혼합물을 건조, 경화하여 구성한 건축용 내,외장재.In-building construction comprising lightweight concrete and its mixture dried and cured, comprising a foaming agent added to form foamed pores in cement to form a mixture, followed by drying and curing by injecting the mixture into a mold. , Exterior materials.
KR20-2004-0016968U 2004-06-11 2004-06-11 Interior and exterior materials for construction made by drying and curing lightweight concrete and its mixture KR200372105Y1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224531B1 (en) 2011-04-08 2013-01-22 이승희 Constructing structure an underfloor-heating room has ondol-floor formation with brick formation and pellet formation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101224531B1 (en) 2011-04-08 2013-01-22 이승희 Constructing structure an underfloor-heating room has ondol-floor formation with brick formation and pellet formation

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