KR0183430B1 - Composition of electronically conductive mortar and concrete - Google Patents
Composition of electronically conductive mortar and concrete Download PDFInfo
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- KR0183430B1 KR0183430B1 KR1019950008110A KR19950008110A KR0183430B1 KR 0183430 B1 KR0183430 B1 KR 0183430B1 KR 1019950008110 A KR1019950008110 A KR 1019950008110A KR 19950008110 A KR19950008110 A KR 19950008110A KR 0183430 B1 KR0183430 B1 KR 0183430B1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/022—Carbon
- C04B14/024—Graphite
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/10—Acids or salts thereof containing carbon in the anion
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/34—Flow improvers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/90—Electrical properties
- C04B2111/94—Electrically conducting materials
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Conductive Materials (AREA)
Abstract
본 발명은 도전성 몰탈 및 콘크리트 조성물에 관한 것으로서, 더욱 상세하게는 시멘트 결합재에 도전성 재료로서 입도를 조절한 흑연 화합물과 유동화제를 첨가함으로써 우수한 전기전도성과 구조용으로 사용가능한 강도를 갖도록한 도전성 몰탈 및 콘크리트 조성물에 관한 것이다.The present invention relates to a conductive mortar and concrete composition, and more particularly, to a conductive material mortar and concrete which has excellent electrical conductivity and strength usable for structural use by adding a graphite compound and a fluidizing agent having a particle size as a conductive material to the cement binder. It relates to a composition.
Description
본 발명은 도전성 몰탈 및 콘크리트 조성물에 관한 것으로서, 더욱 상세하게는 시멘트 결합재에 도전성 재료로서 입도를 조절한 흑연 화합물과 유동화제를 첨가함으로써 우수한 전기전도성과 구조용으로 사용가능한 강도를 갖도록한 도전성 몰탈 및 코크리트 조성물에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to conductive mortars and concrete compositions, and more particularly, to conductive cement mortars and noses having excellent electrical conductivity and strength that can be used for structural purposes by adding graphite compounds and fluidizing agents whose particle size is controlled as a conductive material to cement binders. It relates to a crete composition.
도전성 몰탈 및 콘크리트는 우수한 전기전도성, 높은 강도, 고내구성 및 우수한 시공성 등의 특징으로 갖는 콘트리트로서, 접지저항 저감, 정전기 방지, 발열 및 전자파 차폐용 시멘트 콘트리트 제품 등에 사용할 수 있다.Conductive mortar and concrete are concretes having characteristics such as excellent electrical conductivity, high strength, high durability and excellent workability, and can be used for cement concrete products for reducing ground resistance, antistatic, heat generation, and electromagnetic wave shielding.
지금까지의 도전성 몰탈 및 콘크리트 제품은 시멘트에 도전성 재료로서 열처리한 석유코크스를 혼합한 제품[마르코나이트(MARCONITE), 영국 마르코나이트사 제품] 또는 탄소섬유를 혼합한 것[도덴크리트(DODENCRETE),일본 적수화학사 제품]인데, 이와 같이 열처리한 석유코크스를 도전성 재료로 첨가하는 경우에는 저항감소 효과에 한계가 있다. 그리고, 탄소섬유는 재료의 단가가 높을 뿐 아니라 재료를 시멘트와 혼합하기가 어려워 작업성을 떨어뜨리는 문제가 있다.Until now, conductive mortar and concrete products have been mixed with cement mixed with petroleum coke, which has been heat-treated as a conductive material (Marconite, manufactured by Markonite, UK) or carbon fiber [DODENCRETE, Japan Product of Integral Chemicals Co., Ltd., when the heat treated petroleum coke is added as a conductive material, there is a limit in the effect of reducing the resistance. In addition, the carbon fiber has a problem that not only the high cost of the material but also difficult to mix the material with the cement, reducing workability.
또한, 현재까지의 도전성 몰탈 및 콘크리트 재료는 접지저항 저감용으로만 용도가 한정되어져 있어 그 사용에 한계가 있다.In addition, the use of the conductive mortar and the concrete material to date is limited only to the reduction of the ground resistance, there is a limit to its use.
따라서, 본 발명자들은 종래의 도전성 몰탈 및 콘크리트 조성의 혼합성과 도전성재료의 문제점을 해결하기 위하여 연구 노력한 결과, 시멘트에 도전성 재료로서 토상흑연, 인산흑연 등의 흑연을 입도를 조절하여 혼합한 것을 첨가하고, 혼합성을 조절하기 위해 유동화제를 첨가함으로써 전기전도성 및 강도가 우수하고 시멘트와의 충분한 혼합성을 확보할 수 있으며, 용도가 다양한 도전성 몰탈 및 콘크리트 조성물을 개발하게 되었다.Accordingly, the present inventors have made efforts to solve the problems of the conventional conductive mortar and concrete composition and the problem of the conductive material, and as a conductive material to the cement is added a mixture of graphite, such as soil graphite, graphite phosphate, by controlling the particle size In addition, by adding a fluidizing agent to control the mixing properties, it has excellent electrical conductivity and strength, and can ensure sufficient mixing with cement, and various conductive mortars and concrete compositions have been developed.
본 발명은 전기전도성 및 강도가 우수하며 작업성을 향상시킨 도전성 몰탈 및 콘크리트 조성물을 제공하는데 그 목적이 있다.An object of the present invention is to provide a conductive mortar and concrete composition having excellent electrical conductivity and strength and improved workability.
이하, 본 발명을 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in detail.
본 발명은 결합재에 도전성 재료, 첨가제를 첨가하여 이루어진 몰탈 및 콘크리트 조성물에 있어서, 결합재 100 중량부에 대하여 도전성 재료로서 토상흑연, 인상흑연 및 인조흑연 중에서 선택된 1종 이상의 것 100~400 중량부와 나프탈렌계, 멜라민계 또는 리그닌계 유동화제 0.5~2.0 중량부가 첨가되어 이루어진 것을 그 특징으로 한다.In the present invention, in the mortar and concrete composition obtained by adding a conductive material and an additive to a binder, 100 to 400 parts by weight of at least one selected from earth graphite, impression graphite, and artificial graphite with respect to 100 parts by weight of the binder, and naphthalene It is characterized by consisting of 0.5 to 2.0 parts by weight of the system, melamine-based or lignin-based fluidizing agent.
이와 같은 본 발명을 더욱 상세히 설명하면 다음과 같다.Referring to the present invention in more detail as follows.
본 발명은 전기전도성 및 강도가 우수한 전도성 몰탈 및 콘크리트 조성물에 있어서, 일반적으로 시멘트 콘크리트는 비저항이 수백만 Ωcm 정도의 절연체인데 본 발명에서는 도전성을 부여하기 위하여 골재 대용으로 도전성 재료를 사용하고 결합재로서 시멘트계 재료를 사용한다. 여기서 결합재로는 보통 포틀랜드 시멘트, 중용열 포틀랜드 시멘트, 조강 포틀랜드 시멘트, 초조강 포틀랜드 시멘트 등과 같은 포틀랜드 시멘트, 슬래그 시멘트, 플라이애쉬 시멘트, 알루미나 시멘트 등과 같은 혼합 시멘트, 백 시멘트, 초속경 시멘트, 팽창 시멘트 또는 고강도 시멘트 등의 특수 시멘트를 사용한다.In the present invention, in the conductive mortar and concrete composition having excellent electrical conductivity and strength, in general, cement concrete is an insulator having a specific resistance of about several millions of cm, but in the present invention, a conductive material is used as a substitute for aggregate to provide conductivity, and a cement-based material as a binder. Use Here, the binder is usually a mixture of cement, white cement, cemented carbide cement, expanded cement, such as portland cement, slag cement, fly ash cement, alumina cement, etc. Use special cement such as high strength cement.
그리고 도전성 재료로는 토상흑연, 인상흑연 및 인조흑연 중에서 1종 이상을 선택하여 사용한다. 이때, 우수한 전기전도성을 갖게 하기 위해서는 도전성 재료가 콘크리트내에 연속적으로 분포하는 것이 중요하기 때문에 도전성 재료의 입도를 최밀 충전이 되도록 조정하여 첨가하여야 한다. 따라서 본 발명에서는 상기 도전성 재료의 입도 범위를 4~200 메쉬로 하며, 이중에서 16~50 메쉬의 입도를 갖는 흑연을 15~80%, 80~200 메쉬를 갖는 흑연을 80~15% 분포하도록 한다.As the conductive material, at least one selected from earth graphite, impression graphite, and artificial graphite is used. At this time, in order to have excellent electrical conductivity, it is important to continuously distribute the conductive material in concrete, so that the particle size of the conductive material should be adjusted and added so as to achieve the closest filling. Therefore, in the present invention, the particle size range of the conductive material is 4 to 200 mesh, and 15 to 80% of graphite having a particle size of 16 to 50 mesh and 80 to 15% of graphite having 80 to 200 mesh are distributed. .
또한, 구조용으로 사용할 수 있는 강도를 갖게 하기 위해서는 도전성 재료와 결합재인 시멘트와의 배합비가 중요한데, 본 발명에서는 도전성 재료를 결합재 100 중량부에 대하여 100~400 중량부로 한다.In addition, in order to give strength which can be used for structural use, although the compounding ratio of a conductive material and cement which is a binder is important, in this invention, a conductive material shall be 100-400 weight part with respect to 100 weight part of binders.
만일, 도전성 재료의 함량이 100 중량부 미만이면 강도는 높아지는 반면 전기전도도가 저하되며, 400 중량부를 초과하면 전기전도도는 높아지는 반면 강도가 낮아지는 단점이 있다.If the content of the conductive material is less than 100 parts by weight, the strength is increased while the electrical conductivity is lowered. If it is more than 400 parts by weight, the conductivity is increased while the strength is lowered.
도전성 재료와 결합재의 혼합비 외에도 강도 및 그 밖의 물성에 영향을 미치는 또 다른 인자는 이들의 균일한 혼합으로, 본 발명에서는 균일한 혼합을 위해 나프탈렌계, 멜라민계 또는 리그닌계의 유동화제를 0.5~2.0 중량부를 첨가한다.In addition to the mixing ratio of the conductive material and the binder, another factor that affects the strength and other physical properties is uniform mixing thereof. In the present invention, a naphthalene-based, melamine-based or lignin-based fluidizing agent is used for uniform mixing. Add parts by weight.
또한, 충분한 작업성을 얻기 위해서는 재료의 유동특성이 영향을 미치며, 도전성 재료와 시멘트와의 충분한 혼합과 유동성을 확보하기 위해서는 물의 양이 많아야 한다. 그러나, 물의 양이 많아지면 구조체 내부의 기공 증가로 강도가 감소하게 된다.In addition, the flow properties of the material affects to obtain sufficient workability, and the amount of water must be large to ensure sufficient mixing and fluidity of the conductive material and cement. However, as the amount of water increases, the strength decreases due to the increase of pores in the structure.
따라서, 이러한 단점을 보완하기 위해서도 유동화제를 사용하여 물의 첨가량을 감소시키고 재료의 균일한 분산성을 얻을 수 있다.Therefore, in order to compensate for this disadvantage, a fluidizing agent can also be used to reduce the amount of water added and to obtain uniform dispersibility of the material.
상기한 조성 외에도 용도에 따라 기타 첨가제로서 응결촉진제를 사용하여 시멘트의 응결시간을 단축시킴으로써 작업시간을 줄일 수 있으며, 재료의 충전율을 높여 강도를 증진시킬 수 있도록 충전재를 첨가할 수 있다. 여기서, 응결촉진제로는 탄산나트륨, 탄산리튬, 탄산칼륨 등의 탄산염 또는 탄산수소리튬, 탄산수소나트륨, 탄산수소칼륨 등의 탄산수소염 등을 결합재 100 중량부에 대하여 0.5~2.0 중량부를 첨가할 수 있으며, 충전재로는 탄산칼륨 석회, 실리카, 알루미나 또는 탈크(Talc)를 결합재 100 중량부에 대하여 10~40 중량부를 첨가할 수 있다.In addition to the above composition, depending on the use, the use of a coagulation accelerator as an additive may shorten the setting time of the cement, thereby reducing the working time, and adding a filler to increase the filling rate of the material. Here, as a coagulant, 0.5 to 2.0 parts by weight of a carbonate such as sodium carbonate, lithium carbonate or potassium carbonate or hydrogen carbonate such as lithium carbonate, sodium hydrogen carbonate or potassium hydrogen carbonate may be added to 100 parts by weight of the binder. As a filler, 10-40 parts by weight of potassium carbonate lime, silica, alumina or talc may be added to 100 parts by weight of the binder.
이와 같은 본 발명의 몰탈 및 콘크리트 조성물은 결합재와 입도를 조절한 도전성 재료를 혼합하고 여기에 유동화제를 첨가하고 물을 넣어 균일하게 혼합하여 제조한다.Such a mortar and concrete composition of the present invention is prepared by mixing the binder and the conductive material with a particle size control and adding a fluidizing agent and adding water to uniformly mixed.
상기와 같은 본 발명의 도전성 몰탈 및 콘크리트 조성물은 도전성 재료로 흑연을 사용하여 전기전도성이 우수하고, 그것의 입도를 조절함으로써 균일하게 혼합되며, 유동화제를 첨가하여 혼합성 및 작업성을 향상시키고, 강도를 증진시킴으로써 접지저항 저감, 정전기 방지, 발열 및 전자파 차폐용 시멘트 콘트리트 제품 및 구조용으로 유용하게 사용될 수 있다.The conductive mortar and concrete composition of the present invention as described above is excellent in electrical conductivity by using graphite as the conductive material, uniformly mixed by adjusting its particle size, adding a fluidizing agent to improve the mixing and workability, By increasing the strength, it can be usefully used for cement concrete products and structures for reducing ground resistance, antistatic, heating and electromagnetic shielding.
이하, 본 발명을 실시예에 의거 상세히 설명하면 다음과 같은 바, 본 발명이 실시예에 의해 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.
[실시예 1~5 및 비교예 1~4][Examples 1-5 and Comparative Examples 1-4]
실시예 1~5 및 비교예 1~4의 조성 및 그 함량은 다음 표 1에 나타낸 바와 같으며, 결합재와 도전성 재료를 혼합하고, 유동화제를 혼합한 후 물을 첨가하여 혼합하였다.The compositions and contents of Examples 1 to 5 and Comparative Examples 1 to 4 are as shown in Table 1 below, the binder and the conductive material were mixed, a fluidizing agent was mixed, and water was added thereto to mix.
혼합방법은 KS L 5109에 규정되어 있는 수경성 시멘트 반죽 및 모르터의 기계적 혼합방법을 사용하였다.The mixing method used was the mechanical mixing method of hydraulic cement paste and mortar as specified in KS L 5109.
특히, 본 발명의 비교예 4는 실시예 4, 5에 대응되는 것으로서 응결촉진제와 충전재 첨가에 따른 물성의 향상을 나타내고자 한 것이다.Particularly, Comparative Example 4 of the present invention corresponds to Examples 4 and 5, and is intended to show the improvement of physical properties due to the addition of a coagulation accelerator and a filler.
(주) (1) 마이티-100(나프탈렌계 유동화제), 일본 카오(花王)사 제품(1) Mighty-100 (naphthalene-based fluidizing agent), manufactured by Kao, Japan
(2) 탄산칼슘(2) calcium carbonate
(3) 탄산나트륨(3) sodium carbonate
상기에서 사용한 흑연의 입도 분포비는 다음 표 2에 나타낸 바와 같다.The particle size distribution ratio of the graphite used above is as showing in following Table 2.
[실험예 1]Experimental Example 1
실시예 1~5 및 비교예 1~4에 의해 제조된 콘크리트 조성물을 4×4×16cm 몰드로 성형하여 실험체를 제조하고, 제조 후 1일째 탈형하고, 대기중에서 양생하였다.The concrete compositions prepared according to Examples 1 to 5 and Comparative Examples 1 to 4 were molded into 4 × 4 × 16 cm molds to prepare test specimens, demolded on the first day after production, and cured in the air.
양생 후 재령 7일에서 저항과 압축강도를 측정하였으며, 여기서 저항의 측정은 시편의 양 끝 부분에 은(Ag) 전극을 바른 후 저항측정기(Multimeter, FLUKE 사 제품)로 측정하였다. 그리고, 압축 강도는 JIS R 5201, 시멘트의 물리시험 방법에 규정되어 있는 방법으로 측정하였으며, 그 결과는 다음 표 3에 나타낸 바와 같다.After curing, resistance and compressive strength were measured at 7 days of age. The resistance was measured by applying a silver (Ag) electrode to both ends of the specimen and using a resistance meter (Multimeter, manufactured by FLUKE). In addition, the compressive strength was measured by the method specified in JIS R 5201, the physical test method of cement, the results are shown in Table 3 below.
[실험예 2]Experimental Example 2
본 발명의 실시예 5 및 비교예 4에서 제조된 콘크리트 조성물에 대하여 실험예 1에서와 같이 시험체를 제작하고 응결시험을 하였으며, 이때 응결시험은 KS L 5108, 비카트 침에 의한 수경성 시멘트의 응결시간 시험 방법에 의하여 실시하였으나 그 결과는 다음 표 4에 나타낸 바와 같다.For the concrete composition prepared in Example 5 and Comparative Example 4 of the present invention, a test body was prepared and the condensation test was carried out as in Experimental Example 1, in which the condensation test was the setting time of the hydraulic cement by KS L 5108, Vicat needle The test was carried out by the test method, but the results are shown in Table 4 below.
상기 실험예의 결과로부터 본 발명은 결합재로서 다양한 종류의 시멘트를 사용할 수 있고, 특수한 시멘트의 사용으로 재료의 물리적인 성능을 높일 수 있었다. 또한 입도를 조정한 흑연을 1종 이상 선택하여 사용함으로서 입도를 조절하지 않는 흑연을 단독으로 사용하는 경우보다 더 좋은 물성을 얻을 수 있었고, 유동화제의 사용으로 우수한 재료의 분산성을 얻을 수 있었다. 이러한 재료의 균일한 분산성을 구조체 내에서 전기전도성을 증가시킬 뿐만 아니라 강도를 증가시키는 효과를 발휘하였다.From the results of the above experimental example, the present invention can use various kinds of cement as a binder, it was possible to increase the physical performance of the material by using a special cement. In addition, by selecting one or more kinds of graphite having a particle size adjusted, better physical properties can be obtained than when graphite having no particle size is used alone, and excellent dispersibility of materials can be obtained by using a fluidizing agent. The uniform dispersibility of such materials not only increases the electrical conductivity in the structure but also increases the strength.
그 외 실시예 4~5에서와 같이 첨가제로서 충전재를 사용함으로서 구조체의 치밀화를 얻을 수 있어 압축강도의 향상을 기할 수 있고, 응결촉진제의 첨가로 초기 강도의 증진과 함께 시멘트의 응결 경화를 촉진하여 시공시 작업시간을 단축시킬 수 있다는 것을 알 수 있다.As in Examples 4 to 5, by using the filler as an additive, compaction of the structure can be obtained, and the compressive strength can be improved, and the addition of a coagulation accelerator promotes the initial strength and promotes the hardening of cement. It can be seen that work time can be shortened during construction.
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| KR1019950008110A KR0183430B1 (en) | 1995-04-07 | 1995-04-07 | Composition of electronically conductive mortar and concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100328650B1 (en) * | 1999-07-22 | 2002-03-14 | 박상호 | Reduction material and concrete manufactured article of earth resistance |
| KR101450097B1 (en) * | 2014-03-07 | 2014-10-13 | 주식회사 에스티시(Stc) | A Combined Insulation - Waterproof Construction Using Light Insulation Mortar and Waterproof Material and Method Thereof |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100407668B1 (en) * | 1995-12-30 | 2004-07-23 | 금강종합건설 주식회사 | Cement-based mortar composition having fast curing property and self leveling property |
| KR20020079289A (en) * | 2001-04-10 | 2002-10-19 | 박권필 | Electric conductive heating mortar panel producing infrared rays |
| KR20030059602A (en) * | 2002-01-03 | 2003-07-10 | 이선구 | Electro-Conductive Heating Mortar using Graphite and Nonorganic Binder |
| KR100556289B1 (en) * | 2002-07-16 | 2006-03-03 | (주)두영티앤에스 | A Ground Electrode Integrated Electric Pole and A Process for Producing the Same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100328650B1 (en) * | 1999-07-22 | 2002-03-14 | 박상호 | Reduction material and concrete manufactured article of earth resistance |
| KR101450097B1 (en) * | 2014-03-07 | 2014-10-13 | 주식회사 에스티시(Stc) | A Combined Insulation - Waterproof Construction Using Light Insulation Mortar and Waterproof Material and Method Thereof |
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