KR102269372B1 - Manufacturing Method of Undersea Concrete Anchor with High Durability - Google Patents
Manufacturing Method of Undersea Concrete Anchor with High Durability Download PDFInfo
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- KR102269372B1 KR102269372B1 KR1020200146490A KR20200146490A KR102269372B1 KR 102269372 B1 KR102269372 B1 KR 102269372B1 KR 1020200146490 A KR1020200146490 A KR 1020200146490A KR 20200146490 A KR20200146490 A KR 20200146490A KR 102269372 B1 KR102269372 B1 KR 102269372B1
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- B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
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Abstract
Description
본 발명은 고내구성을 갖는 콘크리트 앵커에 관한 것으로, 더욱 상세하게는 산업부산물의 적극적인 활용과 적절한 혼화제의 사용으로 내염성, 장기강도 증진 등 고내구성 발현이 가능해져 해중 부유구조물의 지지를 위한 중력식 콘크리트 앵커용으로 유리하게 적용할 수 있는 해중 콘크리트 앵커용 고내구성 콘크리트 조성물과, 이를 바람직하게 이용한 해중 콘크리트 앵커 제조방법에 관한 것이다.The present invention relates to a concrete anchor having high durability, and more particularly, by the active use of industrial by-products and the use of an appropriate admixture, high durability such as salt resistance and long-term strength enhancement are possible, so a gravity-type concrete anchor for supporting floating structures in the sea It relates to a high-durability concrete composition for an underwater concrete anchor that can be advantageously applied to an underwater concrete anchor, and to a method for manufacturing an underwater concrete anchor using the same.
수상 태양광이나 풍력 발전을 위한 부력체 등의 수상 부유구조물은 한 곳에 머물게 하기 위하여 통상 앵커에 줄을 매어 물밑바닥으로 가라앉힌다. 특히 국내 수상 태양광 발전시스템의 경우는 설치가 간편하고 수심변동에 능동적으로 대응할 수 있는 중력식 콘크리트 앵커를 주로 사용하고 있다. Floating structures, such as floating structures for floating solar or wind power generation, are usually tied to anchors and sink to the bottom of the water in order to stay in one place. In particular, in the case of domestic floating photovoltaic power generation systems, gravity-type concrete anchors that are easy to install and can actively respond to changes in water depth are mainly used.
종래에는 중력식 콘크리트 앵커를 보통 포틀랜드 시멘트를 이용하여 제작해왔다. 그러나 보통 포틀랜드 시멘트에 의한 콘크리트 앵커는 해수에 대한 저항성이 낮아 염소이온 침투가 빠르기 때문에 콘크리트 앵커 내부에 매설된 철근이나 로프 연결고리가 쉽게 부식하고 내구성이 떨어지는 문제가 있었다. Conventionally, gravity-type concrete anchors have been manufactured using portland cement. However, because the concrete anchor made of ordinary Portland cement has low resistance to seawater and fast chloride ion penetration, there is a problem that the reinforcing bar or rope connection embedded in the concrete anchor easily corrodes and the durability is poor.
본 발명은 보통 포틀랜드 시멘트를 주요한 결합재로 사용하는 종래 중력식 콘크리트 앵커의 단점을 개선하고자 개발한 것으로, 내염성, 장기강도 증진 등 고내구성 발현이 가능하여 해중 부유구조물의 지지를 위한 중력식 콘크리트 앵커용으로 유리하게 적용할 수 있는 새로운 조성의 해중 콘크리트 앵커용 고내구성 콘크리트 조성물과, 이를 바람직하게 이용한 해중 콘크리트 앵커 제조방법을 제공하는데 기술적 과제가 있다.The present invention was developed to improve the disadvantages of the conventional gravity-type concrete anchor, which usually uses Portland cement as the main binder, and it is possible to express high durability such as salt resistance and long-term strength enhancement, so it is glass for gravity-type concrete anchor for supporting floating structures in the sea There is a technical problem to provide a high-durability concrete composition for an underwater concrete anchor of a new composition that can be applied to an underwater concrete anchor, and a method for manufacturing an underwater concrete anchor preferably using the same.
상기한 기술적 과제를 해결하기 위해 본 발명은, 고로슬래그 미분말, 무수석고, 소석회, 시멘트 킬른더스트(Cement Kiln Dust, 칼슘 락테이트(Calcium Lactate)를 포함하여 조성된 친환경 결합재; 골재; 혼화제;를 포함하여 배합되되, 물-결합재비 35~55중량%, 단위결합재량 300~500kg/m3, 단위잔골재량 700~900kg/m3, 단위굵은골재량 750~1,000kg/m3로 배합되는 것을 특징으로 하는 해중 콘크리트 앵커용 고내구성 콘크리트 조성물을 제공한다.In order to solve the above technical problem, the present invention provides an eco-friendly binder composed of blast furnace slag fine powder, anhydrite, slaked lime, and cement kiln dust (Calcium Lactate); aggregate; It is blended with a water-binder ratio of 35-55% by weight, a unit binder amount of 300-500 kg/m 3 , a unit fine aggregate amount of 700-900 kg/m 3 , and a unit coarse aggregate amount of 750-1,000 kg/m 3 . It provides a high-durability concrete composition for an underwater concrete anchor.
또한 본 발명은 고내구성 콘크리트 조성물을 이용하여 해중 콘크리트 앵커를 제조하는 방법으로, 콘크리트 앵커 내부에 보강철근을 매설하고 양중고리를 돌출되게 매설하면서 블록으로 성형하여 제조하되, 보강철근과 양중고리는 MgO계 인산 세라믹 코팅제로 코팅 처리하는 것을 특징으로 하는 해중 콘크리트 앵커 제조방법을 제공한다.In addition, the present invention is a method of manufacturing an underwater concrete anchor using a high-durability concrete composition, wherein the reinforcing bar is embedded in the concrete anchor and the double rings are formed to protrude into a block and manufactured, but the reinforcing bars and the double rings are MgO It provides a method for manufacturing an underwater concrete anchor, characterized in that the coating treatment with a phosphoric acid ceramic coating agent.
본 발명에 따르면 다음과 같은 효과를 기대할 수 있다.According to the present invention, the following effects can be expected.
첫째, 콘크리트 배합에서 결합재로 보통 포틀랜드 시멘트의 사용을 배제하고 산업 부산물인 고로슬래그 등을 적극 사용하기 때문에, 이산화탄소 배출을 줄이고 독성물질 또는 환경 오염 요인을 줄일 수 있다. 아울러 산업 부산물의 적극 활용으로 경제성을 확보할 수 있다. 나아가 장기강도와 염소이온 침투저항성에서 향상된 효과를 발휘하기 때문에 고내구성 확보가 가능해져 해중 조건에 놓여지는 콘크리트 앵커용으로 유리하게 적용할 수 있다. First, it is possible to reduce carbon dioxide emissions and reduce toxic substances or environmental pollution factors because the use of portland cement is excluded from the concrete mix and blast furnace slag, which is an industrial by-product, is actively used. In addition, it is possible to secure economic feasibility by actively utilizing industrial by-products. Furthermore, since it exhibits an improved effect in long-term strength and resistance to permeation of chloride ions, it is possible to secure high durability and can be advantageously applied for concrete anchors placed in underwater conditions.
둘째, 장기강도와 염소이온 침투저항성에서 향상된 효과를 발휘하는 고내구성 콘크리트로 콘크리트 앵커를 성형하고, 동시에 내부식성 효과를 발휘하는 MgO계 인산 세라믹 코팅제로 철근과 양중고리를 코팅하면서 해중 콘크리트 앵커를 제조하기 때문에 고내구성 해중 콘크리트 앵커로 제조할 수 있다.Second, an underwater concrete anchor is manufactured by molding a concrete anchor with high-durability concrete that exhibits improved effects in long-term strength and chloride ion penetration resistance, and coating reinforcing bars and double rings with an MgO-based phosphate ceramic coating agent that exhibits corrosion resistance at the same time. Therefore, it can be manufactured as a highly durable underwater concrete anchor.
도 1은 본 발명에 따른 해중 콘크리트 앵커의 제조방법을 도시한다.
도 2은 본 발명에 따라 제조된 해중 콘크리트 앵커를 도시한다.1 shows a method for manufacturing an underwater concrete anchor according to the present invention.
2 shows an underwater concrete anchor manufactured according to the present invention.
1. 해중 콘크리트 앵커용 고내구성 콘크리트 조성물1. High-durability concrete composition for underwater concrete anchor
본 발명은 해중 부유구조물의 지지를 위한 중력식 콘크리트 앵커용으로 유리하게 적용할 수 있는 해중 콘크리트 앵커용 고내구성 콘크리트 조성물에 관한 것으로, 결합재로 고로슬래그 기반의 친환경 결합재를 사용한다는데 특징이 있다. The present invention relates to a high-durability concrete composition for an underwater concrete anchor that can be advantageously applied for a gravity-type concrete anchor for supporting floating structures in the sea, and is characterized in that an eco-friendly binder based on blast furnace slag is used as a binder.
구체적으로 본 발명에 따른 해중 콘크리트 앵커용 고내구성 콘크리트 조성물은, 고로슬래그 미분말, 무수석고, 소석회, 시멘트 킬른더스트(Cement Kiln Dust, 칼슘 락테이트(Calcium Lactate)를 포함하여 조성된 친환경 결합재, 골재, 혼화제를 포함하여 배합되는 것을 특징으로 한다. 특히 친환경 결합재, 골재, 혼화제의 배합재료를 가지고, 물-결합재비 35~55중량%, 단위결합재량 300~500kg/m3, 단위잔골재량 700~900kg/m3, 단위굵은골재량 750~1,000kg/m3로 배합된다.Specifically, the high-durability concrete composition for an underwater concrete anchor according to the present invention is an eco-friendly binder, aggregate, and composition comprising fine blast furnace slag powder, anhydrite, slaked lime, cement kiln dust (Calcium Lactate) It is characterized in that it is blended including an admixture, in particular, it has an eco-friendly binder, aggregate, and admixture material, water-binder ratio of 35 to 55% by weight, unit binder amount 300 to 500 kg/m 3 , unit fine aggregate amount 700 to 900 kg /m 3 , the unit coarse aggregate amount of 750 ~ 1,000kg/m 3 is mixed.
친환경 결합재는 시멘트가 배제된 고로슬래그 기반의 결합재로, 고로슬래그 미분말, 무수석고, 소석회, 시멘트 킬른더스트(Cement Kiln Dust, 칼슘 락테이트(Calcium Lactate)를 포함하여 조성된다. 여기서 소석회는 고로슬래그 및 폐기물 소각시설의 습식 스크러버 백필터 시스템에서 집진된 폐소석회를 바람직하게 사용할 수 있는데, 폐소석회의 사용으로 친환경성, 경제성을 더욱 향상시킬 수 있다. 본 발명에서 친환경 결합재는, 분말도가 6,500~8,500cm2/g인 고로슬래그 미분말 73~88중량%; 분말도가 5,000~7,500cm2/g인 무수석고 10~18중량%; 폐소석회 1.5~3중량%; 시멘트 킬른더스트(Cement Kiln Dust) 0.4~3중량%; 칼슘 락테이트(Calcium Lactate) 0.1~3중량%;로 조성하는 것이 바람직하다. The eco-friendly binder is a blast furnace slag-based binder that excludes cement, and is composed of fine blast furnace slag powder, anhydrite, slaked lime, and cement kiln dust (Calcium Lactate), where the slaked lime is blast furnace slag and The waste slaked lime collected in the wet scrubber bag filter system of the waste incineration facility can be preferably used, and eco-friendliness and economic efficiency can be further improved by using the waste slaked lime. In the present invention, the eco-friendly binder has a fineness of 6,500 to 8,500. 73~88% by weight of fine powder of blast furnace slag of cm2/g; 10~18% by weight of anhydrite with a fineness of 5,000~7,500 cm2/g; 1.5~3% by weight of slaked lime; Cement kiln dust 0.4~3 % by weight; Calcium lactate (Calcium Lactate) 0.1 to 3% by weight;
친환경 결합재에서 고로슬래그 미분말은 시멘트를 대체하는 주요한 재료이고, 무수석고는 고로슬래그의 잠재수경성을 촉진시키는 자극제가 된다. 고로슬래그 및 무수석고에 의해 수화반응으로 에트링자이트, C-S-H 수화물 등이 생성되어 강도를 발현하게 된다. 이때 칼슘 락테이트(Calcium Lactate, C3H6O3·1/2Ca)는 물과 반응하여 Ca2+를 생성하고 pH를 높임으로써, 강도 발현에 도움이 되는 C-S-H 수화물의 생성에 긍정적인 영향을 준다. 고로슬래그 미분말은 분말도 6,500~8,500cm2/g의 고미분말을 사용하는데, 이러한 분말도는 경제성을 확보하면서 초기에 적절한 반응이 가능하다. 높은 분말도로 고로슬래그 내부의 SiO2 성분이 빠르게 수화반응하여 C-S-H(Calcium silicate hydrate) 수화물을 생성하고 강도를 증진시킬 수 있는 것이다. 고로슬래그 미분말은 73~88중량% 사용하며, 73중량% 미만이면 시멘트 대체 효과 및 강도 증진 효과가 미미하고, 78중량% 초과하면 작업성이 떨어진다. 무수석고도 고로슬래그 미분말과 마찬가지로 경제성 확보와 초기 적절한 반응을 위해 분말도 5,000~7,000cm2/g의 고미분말을 사용한다. 이러한 무수석고는 10~18중량% 사용하는데, 10중량% 미만이면 자극 효과 부족으로 초기 강도 발현이 부진하고, 18중량% 초과하면 경제성이 상실한다. 칼슘 락테이트(Calcium Lactate)는 0.1~3중량% 사용하며, 이러한 범위는 초기 강도 증진 효과와 함께 작업성을 확보하기 위한 범위가 된다.In eco-friendly binders, fine powder of blast furnace slag is a major substitute for cement, and anhydrite is a stimulant that promotes the latent hydraulic properties of blast furnace slag. Ettringite, CSH hydrate, etc. are generated by hydration reaction by blast furnace slag and anhydrite to express strength. At this time, calcium lactate (C3H6O3·1/2Ca) reacts with water to generate Ca 2+ and raises the pH, thereby having a positive effect on the generation of CSH hydrate, which helps to develop strength. The fine powder of blast furnace slag uses a fine powder with a fineness of 6,500-8,500 cm2/g, and this fineness ensures economic feasibility and allows an appropriate reaction at an early stage. With high fineness, the SiO 2 component inside the blast furnace slag can quickly hydrate to form a calcium silicate hydrate (CSH) hydrate and increase its strength. The fine powder of blast furnace slag is used in an amount of 73 to 88% by weight, and when it is less than 73% by weight, the effect of replacing cement and enhancing strength is insignificant, and when it exceeds 78% by weight, workability is deteriorated. Anhydrous gypsum, like the fine powder of blast furnace slag, uses a fine powder of 5,000 ~ 7,000 cm2/g for securing economic feasibility and proper initial reaction. Such anhydrite is used in 10 to 18% by weight, and if it is less than 10% by weight, the initial strength expression is sluggish due to lack of stimulation effect, and if it exceeds 18% by weight, economic efficiency is lost. Calcium lactate (Calcium Lactate) is used 0.1 to 3% by weight, this range is a range for securing workability with the initial strength enhancing effect.
친환경 결합재에서 소석회는 자극제로서 고로슬래그의 수화반응을 촉진하여 초기에 에트링자이트, C-S-H 수화물의 양을 증가시켜 강도를 촉진시킨다(C5S3A + CH + 3CS + 34H → C6AS3H32 + 3CSH). 소석회는 습식 스크러버 백필터 시스템에서 집진된 폐소석회를 바람직하게 사용하는데, 이러한 폐소석회는 초기 강도 증진 효과와 작업성 확보를 위해 1.5~3중량% 사용하는 것이 바람직하다. 시멘트 킬른더스트(Cement Kiln Dust)는 시멘트 킬른더스트(Cement Kiln Dust 이하 CKD)는 시멘트 제조공정에서 발생되는 배출가스에 포함된 비산분진을 집진한 것으로, 탄산칼슘 및 알칼리가 포함되어 있기 때문에 초기 수화 반응 촉진으로 응결 촉진과 초기강도 증진에 기여한다. 시멘트 킬른더스트(Cement Kiln Dust)는 0.4~3중량% 사용하는 것이 바람직한데, 이는 초기 강도 증진 효과와 함께 작업성을 확보하기 위함이다.In eco-friendly binders, slaked lime promotes the hydration reaction of the blast furnace slag as a stimulant and increases the amount of ettringite and C-S-H hydrate in the initial stage to promote strength (C5S3A + CH + 3CS + 34H → C6AS3H32 + 3CSH). The slaked lime preferably uses the waste slaked lime collected in the wet scrubber bag filter system, and it is preferable to use the waste slaked lime in an amount of 1.5 to 3 wt % to secure the initial strength improvement effect and workability. Cement Kiln Dust (Cement Kiln Dust, CKD) is a collection of scattering dust contained in the exhaust gas generated during the cement manufacturing process. Since it contains calcium carbonate and alkali, the initial hydration reaction Acceleration contributes to promoting setting and increasing initial strength. It is preferable to use the cement kiln dust in an amount of 0.4 to 3% by weight, in order to secure workability with the effect of improving initial strength.
위와 같은 친환경 결합재는 골재 및 혼화제와 함께, 물-결합재비 35~55중량%, 단위결합재량 300~500kg/m3, 단위잔골재량 700~900kg/m3, 단위굵은골재량 750~1,000kg/m3으로 배합된다. 물-결합재비가 40중량% 미만이면 유동성 저하로 작업성이 떨어지고 50중량% 초과하면 내구성 저하로 균열 발생이 우려된다. 단위결합재량과 단위골재량은 강도 확보와 경제성을 동시에 고려한 결과이다. 이러한 콘크리트 배합은 보통 포틀랜드 시멘트를 사용한 경우보다 초기강도는 낮지만 장기강도와 염소이온침투 저항성에서 향상된 효과를 발현하므로, 해중 조건에서 고내구성을 발휘하여 해중 콘크리트 앵커용으로 유리하게 절용할 수 있을 것으로 기대된다.The above eco-friendly binders, together with aggregates and admixtures, have a water-binding material ratio of 35-55 wt%, a unit binder amount of 300-500 kg/m 3 , a unit fine aggregate amount of 700-900 kg/m 3 , and a unit coarse aggregate amount 750~1,000kg/m 3 It is blended. If the water-binding material ratio is less than 40% by weight, workability is deteriorated due to reduced fluidity, and if it exceeds 50% by weight, cracks may occur due to deterioration of durability. The amount of unit binder and unit aggregate is the result of considering both strength and economic feasibility. Although the initial strength of this concrete mixture is lower than that of ordinary Portland cement, it exhibits improved effects in long-term strength and resistance to chloride ion penetration, so it can be advantageously used for underwater concrete anchors by exhibiting high durability in underwater conditions. It is expected.
2. 해중 콘크리트 앵커2. Submarine Concrete Anchor
위와 같이 친환경 결합재, 혼화제, 골재로 조성된 고내구성 콘크리트 조성물은 해중 조건에서 우수한 장기강도와 내염성을 발휘하기 때문에 해중 콘크리트 앵커용으로 바람직하게 활용할 수 있다. 고내구성 콘크리트 조성물을 이용하여 해중 콘크리트 앵커로 제조한다면, 콘크리트 앵커 내부에 보강철근을 매설하고 양중고리를 돌출되게 매설하면서 블록으로 성형하여 제조할 수 있다. 구체적으로는 도 1과 같은 공정으로 제조할 수 있는데, 먼저 거푸집, 보강철근, 양중고리 등을 준비하고, 이어 보강철근과 양중고리를 거푸집 내에 위치시킨 후 보강철근과 양중고리에 코팅제를 도포하고, 고내구성 콘크리트 조성물을 타설, 양생한 후 거푸집을 탈형한다. 이로써 도 2(a)와 같은 해중 콘크리트 앵커로 제조할 수 있다. 이때 보강철근과 양중고리는 MgO계 인산 세라믹 코팅제로 코팅 처리하는 것이 바람직한데(도 2(b)), 해중에서 콘크리트에 균열이 생겨 물이 침투하더라도 부식을 방지하기 위함이다.As described above, the high-durability concrete composition composed of eco-friendly binders, admixtures, and aggregates exhibits excellent long-term strength and salt resistance in underwater conditions, so it can be preferably used for underwater concrete anchors. If the high-durability concrete composition is used to manufacture an underwater concrete anchor, it can be manufactured by embedding reinforcing bars inside the concrete anchor and forming a block while burying the double rings to protrude. Specifically, it can be manufactured by the same process as in FIG. 1, first prepare a formwork, reinforcing reinforcing bars, double rings, etc., then place the reinforcing bars and double rings in the formwork, and apply a coating agent to the reinforcing bars and the double rings, After pouring and curing the high-durability concrete composition, demold the formwork. Thereby, it can be manufactured as an underwater concrete anchor as shown in Fig. 2(a). At this time, it is preferable to coat the reinforcing bar and the double rings with an MgO-based phosphoric acid ceramic coating agent (Fig. 2(b)) to prevent corrosion even if water penetrates due to cracks in the concrete in the sea.
보강철근과 양중고리의 부식 방지 코팅을 위한 MgO계 인산 세라믹 코팅제는 산화마그네슘(MgO)과 인산염을 포함하는 코팅제로, 특허출원 제10-2019-0139993호 출원된 코팅제이다. 구체적으로 MgO계 인산 세라믹 코팅제는 철강용 폐내화재료 분말 15~45중량%; 반응형 벤토나이트 1~5중량%; 일인산칼륨 10~25중량%; 일인산암모늄 5~20중량%; 규회석 10~40중량%; 이산화티타늄 3~10중량%; 붕사 1~10중량;를 포함하여 바람직하게 조성될 수 있다. The MgO-based phosphoric acid ceramic coating agent for corrosion prevention coating of reinforcing bars and double rings is a coating agent containing magnesium oxide (MgO) and phosphate, and is a coating agent applied for in Patent Application No. 10-2019-0139993. Specifically, the MgO-based phosphoric acid ceramic coating agent is 15 to 45% by weight of powder of waste refractory material for steel; 1-5 wt% of reactive bentonite; Potassium monophosphate 10-25 wt%; 5-20 wt% of ammonium monophosphate; 10-40% by weight of wollastonite; Titanium dioxide 3-10% by weight; 1 to 10 weights of borax; may be preferably formulated to include.
MgO계 인산 세라믹 코팅제에서, 철강용 폐내화재료 분말은 93중량% 이상의 MgO를 함유하면서 2,000~6,000cm2/g 분말도를 가지는 것(이하, '리사이클 MgO 분말'로 칭함)이다. 이러한 리사이클 MgO 분말은 철강공장의 전로, 전기로, 레이들 등에서 사용되어 수명이 다한 폐내화물을 볼밀, 진동밀 등으로 분쇄한 분말이다.리사이클 MgO 분말은 자연스럽게 소성된 상태이기 때문에 과소된 MgO 형태로 존재하며, 본 발명에서는 과소된 MgO가 93중량% 이상 함유한 것으로 적용된다. 이러한 리사이클 MgO 분말은 과소된 MgO 형태이므로 반응성이 낮고 안정적이며, 또한 일반 시중에서 판매되는 과소된 MgO보다 경제성이 좋고 높은 강도성능이 구현된다. 특히 또한 기존 시중의 과소 MgO와 리사이클 MgO를 동일 조건에서 분쇄할 경우 리사이클 MgO의 분말도가 더 높은 것으로 확인되었는데, 리사이클 MgO는 무기결합재로 성형 된 블록이나 벽돌형태의 폐내화물이 고온의 조건에 노출되어 소성된 후 배출된 것 이어서 소성에 의해 폐내화물이 약한 모형체를 가지므로 동일 조건으로 분쇄할 경우 기존 시중의 과소 MgO보다 분쇄효율이 우수해 더 높은 분말도를 가지게 되는 것이다. 분말도가 높은 경우 반응성이 우수하기 때문에 코팅제의 우수한 특성확보에 더욱 유리하게 작용한다. 리사이클 MgO 분말은 2,000~6,000cm2/g 분말도를 가지는 것 이 바람직한데, 분말도가 2,000cm2/g 미만이면 비표면적이 낮아 반응성이 지나치게 낮으며, 반면에 6,000cm2/g 초과하면 경제성이 떨어진다. 리사이클 MgO 분말은 반응 성, 친환경성, 경제성, 물리적 특성을 고려하여 15~45중량% 사용하는 것이 바람직하며, 15중량% 미만이면 친환경성 및 경제성이 떨어지고, 45중량%를 초과하면 친환경성 및 경제성은 개선되지만 다른 재료와의 반응성에서 떨어진다. In the MgO-based phosphoric acid ceramic coating agent, the waste refractory material powder for steel contains 93% by weight or more of MgO and has a fineness of 2,000 to 6,000 cm 2 /g (hereinafter referred to as 'recycled MgO powder'). This recycled MgO powder is a powder that is used in a converter, an electric furnace, a ladle, etc. of a steel factory and pulverized waste refractory materials that have reached the end of their lifespan with a ball mill or a vibrating mill. Since recycled MgO powder is in a naturally calcined state, it is It exists, and in the present invention, it is applied as containing less than 93% by weight of MgO. Since this recycled MgO powder is in the form of depleted MgO, it has low reactivity and is stable, and it is more economical than depleted MgO sold in the general market and high strength performance is realized. In particular, it was confirmed that the fineness of the recycled MgO was higher when the existing commercially depleted MgO and recycled MgO were pulverized under the same conditions. In the case of recycled MgO, the waste refractories in the form of blocks or bricks formed with inorganic binders are exposed to high temperature conditions. Since the waste refractory material has a weak model body by calcination after being calcined and discharged, when pulverized under the same conditions, the pulverization efficiency is superior to that of the existing depleted MgO in the market, resulting in higher fineness. When the fineness is high, the reactivity is excellent, so it acts more advantageously in securing excellent properties of the coating agent. It is preferable that the recycled MgO powder has a fineness of 2,000 to 6,000 cm 2 /g. If the fineness is less than 2,000 cm 2 /g, the specific surface area is low and the reactivity is too low. On the other hand, if it exceeds 6,000 cm 2 /g, economic feasibility is not achieved. falls Recycled MgO powder is preferably used in 15 to 45% by weight in consideration of reactivity, eco-friendliness, economical efficiency, and physical properties. If it is less than 15% by weight, eco-friendliness and economical efficiency deteriorate, and if it exceeds 45% by weight, it is eco-friendly and economical. is improved, but the reactivity with other materials is poor.
MgO계 인산 세라믹 코팅제에서, 반응형 벤토나이트는 알칼리 수용액이 도포된 벤토나이트를 분쇄하여 분말도 1,500~3,000cm2/g로 제조된 것으로, 작업시간 확보와 유동성 확보에 기여 한다. 벤토나이트는 수분을 흡수하는 성질과 흡수된 수분을 장시간에 걸쳐 용출하는 특징이 있는데, 이러한 특성 때문에 벤토나이트에 알칼리 수용액을 도포하면 벤토나이트가 알칼리 수용액을 흡수하게 되며, 이로써 반응형 벤토나이트는 벤토나이트에 흡수된 알칼리 수용액이 서서히 용출되면서 산성환경을 억제하고 급속한 경화를 완화하기 때문에 코팅제의 작업시간을 지연시키고 유동성을 개선시키는 효과가 있다. 알칼리 수용액은 물 100중량부에 대하여 알카리염을 0.3~4중부량가 혼입된 것이 바람직한데, 알칼리염이 0.3중량부 미만이면 그 효과가 미미하고, 4중량부 초과하면 초기 경화가 지나치게 지연되어 강도성능 저하가 우려된다. 여기서 알칼리염은 황산칼륨, 황산나트륨을 사용하는 것이 경제적이고 효과적이다. In the MgO-based phosphoric acid ceramic coating agent, reactive bentonite is produced by pulverizing bentonite coated with an aqueous alkali solution to have a powder of 1,500 to 3,000 cm2/g, which contributes to securing working time and securing fluidity. Bentonite has the characteristics of absorbing moisture and eluting the absorbed moisture over a long period of time. Because of these characteristics, when an aqueous alkali solution is applied to bentonite, the bentonite absorbs the aqueous alkali solution. As the aqueous solution slowly elutes, it suppresses the acidic environment and relieves rapid curing, so it has the effect of delaying the working time of the coating agent and improving the fluidity. In the aqueous alkali solution, 0.3 to 4 parts by weight of alkali salt is preferably mixed with respect to 100 parts by weight of water. When the alkali salt is less than 0.3 parts by weight, the effect is insignificant, and when it exceeds 4 parts by weight, initial curing is excessively delayed and strength performance decline is concerned. Here, it is economical and effective to use potassium sulfate and sodium sulfate as the alkali salt.
일인산칼륨과 일인산암모늄은 인산염으로 사용되는 것인데, 리사이클 MgO 분말과 함께 수화하여 경화하는 재료가 된다. 일인산칼륨은 조기강도 발현, 내산성 개선에 효과가 있는데, 10~25중량% 사용한다. 일인산칼륨이 10중량% 미만이면 조기강도 발현 및 내산성 개선 효과가 미약하고, 25중량% 초과하면 빠른 경화 특성으로 인해 작업시간 확보가 어렵다. 일인산암모늄은 수화반응시 발열이 낮은 이점이 있으나, 암모니아 가스가 발생하여 악취가 발생하는 단점이 있다. 일인산암 모늄은 5~20중량% 사용하는데, 5중량% 미만이면 리사이클 MgO 분말과의 반응성이 떨어지며, 20중량% 초과하면 암모니아 기체의 방출량이 많아져 작업환경이 저하한다. Potassium monophosphate and ammonium monophosphate are used as phosphates, and they become materials that hydrate and harden together with recycled MgO powder. Potassium monophosphate is effective in developing early strength and improving acid resistance, and it is used in an amount of 10 to 25% by weight. When potassium monophosphate is less than 10% by weight, the effect of early strength expression and acid resistance improvement is weak, and when it exceeds 25% by weight, it is difficult to secure working time due to fast curing characteristics. Ammonium monophosphate has the advantage of low heat generation during the hydration reaction, but has a disadvantage in that ammonia gas is generated and an odor is generated. Ammonium monophosphate is used in 5 to 20% by weight. If it is less than 5% by weight, the reactivity with the recycled MgO powder decreases, and if it exceeds 20% by weight, the amount of ammonia gas emitted increases and the working environment is deteriorated.
규회석은 충전재가 되어 강도 성능을 증진시키고 코팅제의 균열방지에 기여한다. 규회석은 분말도가 1,800~3,000cm2/g인 섬유상으로 평균길이:직경의 비가 12:1 이상인 것이 바람직한데, 분말도가 1,800cm2/g 미만이면 충전이 치밀화 되지 못하고, 3,000cm2/g 초과하면 섬유상 침상구조가 파괴되어 강도, 내구성 개선 및 균열 방지의 효과가 저하하며, 또한 섬유상 평균길이:직경의 비가 최소 12:1 이상이 되어야 균열방지에 기여할 수 있다. 규회석은10~40중량% 사용하는 것이 바람직하다. Wollastonite serves as a filler to enhance strength performance and contributes to crack prevention in coatings. Wollastonite is fibrous with a fineness of 1,800 to 3,000 cm2/g, and an average length: diameter ratio of 12:1 or more is preferable. If the fineness is less than 1,800 cm2/g, the filling cannot be densified. As the needle structure is destroyed, the effect of improving strength and durability and preventing cracks is reduced. In addition, the ratio of average fibrous length to diameter must be at least 12:1 to contribute to crack prevention. Wollastonite is preferably used in an amount of 10 to 40 wt%.
이산화티타늄은 백색안료로 코팅제의 색도를 밝게 유지시켜주고 또한 내광성이 있어 도포 후의 코팅면이 빛과 만나 변색되는 것을 방지해준다. 이산화티타늄은 3~10중량% 사용하는 것이 바람직하며, 3중량% 미만이면 사용 효과가 미미하고, 10중량% 이상이면 경제성이 떨어진다. Titanium dioxide is a white pigment that keeps the chromaticity of the coating bright and also has light resistance to prevent discoloration of the coated surface after application due to contact with light. Titanium dioxide is preferably used in an amount of 3 to 10% by weight, if it is less than 3% by weight, the effect is insignificant, and if it is 10% by weight or more, economical efficiency is lowered.
붕사는 반응의 지연으로 적절한 작업시간의 확보에 기여하는 재료가 되며, 1~10중량% 사용한다. 1중량% 미만이면 반응지연 효과가 없고, 10중량% 초과하면 반응 지연 효과가 더 이상 개선되지 않아 경제성을 상실한다. Borax becomes a material that contributes to securing an appropriate working time due to delayed reaction, and is used in an amount of 1 to 10% by weight. If it is less than 1% by weight, there is no reaction delay effect, and if it exceeds 10% by weight, the reaction delay effect is no longer improved and economical efficiency is lost.
위와 같이 조성된 폐내화물을 이용한 코팅제 조성물은 물배합하여 보강철근, 양중고리에 적용하면 된다. 이때 물배합은 폐내화물을 이용한 코팅제 100중량부에 물 15~30중량부가 적당하다. 이렇게 물배합한 코팅제는 적절한 유동성과 응결시간을 확보하고, 나아가 우수한 강도 특성과 내부식성 특성을 발휘히며, 이로써 철근 등의 금속 표면도장용 코팅제로 유리하게 적용할 수 있다.The coating composition using the waste refractories prepared as above may be mixed with water and applied to reinforcing bars and double rings. At this time, 15 to 30 parts by weight of water is suitable for 100 parts by weight of the coating agent using the waste refractory material. The coating agent mixed with water in this way secures appropriate fluidity and setting time, and further exhibits excellent strength and corrosion resistance properties, and thus can be advantageously applied as a coating agent for surface coating of metals such as reinforcing bars.
이하에서는 시험예에 의거하여 본 발명을 상세히 살펴본다. 다만, 아래의 시험예는 본 발명을 예시하기 위한 것일 뿐이며, 본 발명의 범위가 이로써 한정되는 것은 아니다.Hereinafter, the present invention will be described in detail based on test examples. However, the following test examples are only for illustrating the present invention, and the scope of the present invention is not limited thereto.
[시험예] 해중 콘크리트 앵커용 고내구성 콘크리트 조성물의 특성[Test Example] Characteristics of high-durability concrete composition for underwater concrete anchor
1. 친환경 결합재 준비1. Preparation of eco-friendly binders
아래 [표 1]과 같은 조성으로 친환경 결합재를 준비하였으며, 준비한 친환경 결합재는 밀도 2.93 g/cm3, 분말도 6,275 cm2/g를 나타냈다. An eco-friendly binder was prepared with the composition shown in [Table 1] below, and the prepared eco-friendly binder had a density of 2.93 g/cm 3 , and a powderiness of 6,275 cm 2 /g.
고미분말blast furnace slag
bitter powder
킬른더스트cement
kiln dust
락테이트calcium
lactate
- 무수석고: 분말도 5500~7500cm2/g
- 폐소석회: 습식스크러버 백필터 시스템에서 집진
- 시멘트 킬른더스트: 분말도 7000~8000cm2/g
- 칼슘 락테이트: 밀도 1.49g/cm3- Blast furnace slag fine powder: fineness of 6000~8500cm2/g
- Anhydrous gypsum: 5500~7500cm2/g of powder
- Waste slaked lime: dust collected in wet scrubber bag filter system
- Cement kiln dust: fineness of 7000~8000cm2/g
- Calcium Lactate: Density 1.49g/cm3
2. 콘크리트 배합2. Concrete mixing
아래 [표 1]의 친환경 결합재를 이용하여 아래 [표 2]와 같은 배합으로 콘크리트를 배합하였다. 비교예는 종래 해중 콘크리트 앵커 제조에 일반적으로 사용하는 보통 포틀랜드 시멘트를 사용하여 배합하였다.Concrete was blended using the eco-friendly binder shown in [Table 1] below in the same way as in [Table 2] below. Comparative Example was formulated using ordinary Portland cement, which is generally used in the manufacture of conventional submersible concrete anchors.
(%)W/C
(%)
(%)S/a
(%)
결합재Eco
binder
- 친환경 결합재 : [표 1]
- 잔골재(S) : 부순모래 밀도 2.6 g/cm3
- 굵은골재(G) : 25mm 부순자갈 밀도 2.65 g/cm3
- Ad : 폴리카르복실산(PC혼화제)- Ordinary Portland Cement (OPC): Density 3.15 g/cm 3 , Fineness 3,516 cm 2 /g
- Eco-friendly binder: [Table 1]
- Fine aggregate (S): crushed sand density 2.6 g/cm 3
- Coarse aggregate (G): 25mm crushed gravel Density 2.65 g/cm 3
- Ad: Polycarboxylic acid (PC admixture)
3. 콘크리트 특성 평가3. Evaluation of concrete properties
배합한 콘크리트에 대하여 슬럼프, 공기량, 압축강도, 염소이온침투저항성을 시험하였다. 슬럼프는 KS F 2402, 공기량은 KS F 2421, 압축강도는 KS F 2405, 염소이온 침투저항성은 KS F 2711에 의거하여 시험하였다. 콘크리트의 염소이온 침투 저항성 시험은 콘크리트 시험체를 Ф100×H50mm로 컷팅 후 시험체는 진공펌프로 3시간 진공 처리하고 증류수에 시험체를 침지하여 1시간 동일하게 압력을 가한 후 18±2시간 동안 침지시킨 후 측정셀에 체결하고 데이터 장치를 통하여 측정하였다. 시험결과는 아래 [표 3]과 같이 나타냈다.The mixed concrete was tested for slump, air volume, compressive strength, and chloride ion penetration resistance. The slump was tested according to KS F 2402, the amount of air was KS F 2421, the compressive strength was KS F 2405, and the chloride ion penetration resistance was tested according to KS F 2711. For the chloride ion penetration resistance test of concrete, cut the concrete specimen to Ф100×H50mm, vacuum the specimen for 3 hours with a vacuum pump, immerse the specimen in distilled water, apply the same pressure for 1 hour, and then immerse for 18±2 hours. It was fastened to the cell and measured through the data device. The test results are shown in [Table 3] below.
(mm)slump
(mm)
(%)air volume
(%)
(통과전하량, C)Chloride ion penetration resistance
(passage charge, C)
위의 [표 3]에서와 같이 친환경 결합재를 사용한 실시예1,2,3은 보통 포틀랜드 시멘트를 사용한 비교예1,2,3보다 높은 슬럼프를 나타냈고, 초기강도가 낮게 나타냈지만 장기강도는 높게 나타냈다. 또한 염소이온 침투 저항성은 통과 전하량이 낮을수록 높은 저항성을 나타내는데, 친환경 결합재를 사용한 실시예1,2,3은 보통 포틀랜드 시멘트를 사용한 비교예1,2,3보다 상당히 높은 저항성을 나타냈다. 이와 같은 결과에 따라 본 발명에 따른 콘크리트 조성물은 장기강도와 염소이온 침투저항성에서 유리한 효과를 나타내어 고내구성 콘크리트로서 해중 콘크리트 앵커용으로 유리하게 적용할 수 있을 것으로 기대된다. As shown in [Table 3] above, Examples 1, 2, and 3 using an eco-friendly binder showed a higher slump than Comparative Examples 1, 2, and 3 using normal Portland cement, and showed a low initial strength, but high long-term strength. showed In addition, the chloride ion penetration resistance shows a higher resistance as the amount of passing charge is lower. Examples 1, 2, and 3 using the eco-friendly binder showed significantly higher resistance than Comparative Examples 1, 2, and 3 using ordinary Portland cement. According to these results, the concrete composition according to the present invention is expected to exhibit advantageous effects in long-term strength and resistance to permeation of chloride ions, so that it can be advantageously applied as a high-durability concrete for anchors in underwater concrete.
Claims (4)
해중 콘크리트 앵커 내부에 보강철근을 매설하고 양중고리를 돌출되게 매설하면서 고내구성 콘크리트 조성물로 해중 콘크리트 앵커를 블록으로 성형하여 제조하되,
상기 고내구성 콘크리트 조성물은, 고로슬래그 미분말, 무수석고, 소석회, 시멘트 킬른더스트(Cement Kiln Dust, 칼슘 락테이트(Calcium Lactate)를 포함하여 조성된 친환경 결합재; 골재; 혼화제;를 포함하면서, 물-결합재비 35~55중량%, 단위결합재량 300~500kg/m3, 단위잔골재량 700~900kg/m3, 단위굵은골재량 750~1,000kg/m3로 배합하고,
상기 보강철근과 양중고리는, MgO계 인산 세라믹 코팅제로 코팅 처리하는 것을 특징으로 하는 고내구성 해중 콘크리트 앵커 제조방법.A method for manufacturing an underwater concrete anchor with a high-durability concrete composition, the method comprising:
Manufactured by burying reinforcing bars inside the underwater concrete anchor and burying the double rings to protrude, molding the underwater concrete anchor into a block with a high-durability concrete composition,
The high-durability concrete composition is an eco-friendly binder composed of blast furnace slag fine powder, anhydrite, slaked lime, and cement kiln dust (Calcium Lactate); Aggregate; Admixture; Water-binding while including; reboil and 35 to 55% by weight of units coupled discretion combined in 300 ~ 500kg / m 3, the unit amount of aggregate 700 ~ 900kg / m 3, the unit coarse goljaeryang 750 ~ 1,000kg / m 3,
The reinforcing bar and the double rings are highly durable underwater concrete anchor manufacturing method, characterized in that the coating treatment with MgO-based phosphoric acid ceramic coating agent.
상기 고내구성 콘크리트 조성물은, 친환경 결합재로 분말도 6,500~8,500cm2/g인 고로슬래그 미분말 73~88중량%; 분말도 5,000~7,000cm2/g인 무수석고 10~18중량%; 폐소석회 1.5~3중량%; 시멘트 킬른더스트(Cement Kiln Dust) 0.4~3중량%; 칼슘 락테이트(Calcium Lactate) 0.1~3중량%;로 조성된 친환경 결합재와, 혼화제로 폴리카르복실산계 혼화제를 이용하여 배합하는 것을 특징으로 하는 고내구성 해중 콘크리트 앵커 제조방법.In claim 1,
The high-durability concrete composition, 73-88 wt% of a fine powder of blast furnace slag having a fineness of 6,500-8,500 cm2/g as an eco-friendly binder; 10-18 wt% of anhydrite having a fineness of 5,000-7,000 cm2/g; 1.5 to 3 wt% of waste slaked lime; Cement Kiln Dust 0.4 to 3% by weight; A method for manufacturing a high-durability underwater concrete anchor, characterized in that it is blended with an eco-friendly binder composed of 0.1 to 3% by weight of calcium lactate, and a polycarboxylic acid-based admixture as an admixture.
상기 MgO계 인산 세라믹 코팅제는, 93중량% 이상의 MgO를 함유하면서 2,000~6,000cm2/g의 분말도를 가지는 철강용 폐내화재료 분말 15~45중량%; 물 100중량부에 대하여 황산칼륨, 황산나트륨 중 하나 이상의 알칼리염 0.3~4중량부가 혼합된 알칼리 수용액이 도포된 벤토나이트를 분쇄하여 분말도 1,500~3,000cm2/g로 제조된 반응형 벤토나이트 1~5중량%; 일인산칼륨 10~25중량%; 일인산암모늄 5~20중량%; 규회석 10~40중량%; 이산화티타늄 3~10중량%; 붕사 1~10중량;를 포함하여 조성된 MgO계 인산 세라믹 코팅제인 것을 특징으로 하는 고내구성 해중 콘크리트 앵커 제조방법. In claim 1 or 2,
The MgO-based phosphoric acid ceramic coating agent, while containing 93% by weight of MgO, and having a fineness of 2,000 ~ 6,000 cm2 / g of steel waste refractory material powder 15 ~ 45%; 1 to 5% by weight of reactive bentonite prepared by grinding bentonite coated with an aqueous alkali solution in which 0.3 to 4 parts by weight of one or more alkali salts of potassium sulfate and sodium sulfate are mixed with respect to 100 parts by weight of water to have a powder of 1,500 to 3,000 cm2/g ; Potassium monophosphate 10-25 wt%; 5-20 wt% of ammonium monophosphate; 10-40% by weight of wollastonite; Titanium dioxide 3-10% by weight; High-durability underwater concrete anchor manufacturing method, characterized in that it is a MgO-based phosphoric acid ceramic coating composition comprising 1 to 10 weights of borax.
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