KR20200098048A - Self-Healing mortar composition - Google Patents
Self-Healing mortar composition Download PDFInfo
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/06—Inhibiting the setting, e.g. mortars of the deferred action type containing water in breakable containers ; Inhibiting the action of active ingredients
- C04B40/0675—Mortars activated by rain, percolating or sucked-up water; Self-healing mortars or concrete
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- C04B14/02—Granular materials, e.g. microballoons
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- 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
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
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- C04B18/08—Flue dust, i.e. fly ash
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
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- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
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- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/06—Oxides, Hydroxides
- C04B22/066—Magnesia; Magnesium hydroxide
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- 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
- C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
- C04B22/142—Sulfates
- C04B22/147—Alkali-metal sulfates; Ammonium sulfate
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- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/141—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 calcium sulfate cements containing dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
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- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0088—Compounds chosen for their latent hydraulic characteristics, e.g. pozzuolanes
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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Abstract
Description
본 발명은 자기 보수성 모르타르 조성물에 관한 것으로서, 좀 더 자세히는 콘크리트 구조물의 화학적 부식에 의해 발생한 생성물인 이수석고를 분해하고 이 과정에서 생성된 화합물과 2차로 포졸란 반응을 유도하여 재열화 발생을 억제하고 콘크리트 구조물의 수명을 장기간 유지할 수 있는 자기 보수성 모르타르 조성물에 관한 것이다.The present invention relates to a self-retaining mortar composition, and in more detail, decomposes dihydrate gypsum, a product produced by chemical corrosion of a concrete structure, and induces a pozzolanic reaction secondary with the compound produced in this process to suppress the occurrence of re-deterioration and It relates to a self-repairing mortar composition capable of maintaining the life of the structure for a long time.
일반적으로 콘크리트 구조물은 염해, 황산염 침식 등 여러 가지 화학적 부식에 의한 열화에 매우 취약하다. 물과 시멘트가 반응하여 생성되는 수산화칼슘(Ca(OH)2)은 황산염(SO3)과 반응하여 이수석고를 생성하는데 이때 이수석고의 팽창성으로 인해 콘크리트 내부 매트릭스 구조가 파괴되어 콘크리트의 열화가 촉진된다.In general, concrete structures are very susceptible to deterioration due to various chemical corrosions such as salt damage and sulfate erosion. Calcium hydroxide (Ca(OH) 2 ) produced by the reaction of water and cement reacts with sulfate (SO 3 ) to form dihydrate gypsum.At this time, due to the expandability of the dihydrate gypsum, the inner matrix structure of the concrete is destroyed, thereby promoting deterioration of the concrete.
현재 열화된 콘크리트 구조물을 보수하는 재료는 다양하나 일반적으로 대부분 시멘트 베이스로 이루어진 보수 모르타르로 구성되어 있어 보수 후에도 단기간에 재열화가 발생하여 구조물 유지관리 비용이 증대되는 실정이다.Currently, there are various materials for repairing deteriorated concrete structures, but since most of them are composed of repair mortar made of cement base, re-deterioration occurs in a short period of time even after repair, resulting in increased structure maintenance cost.
또한, 화학적 부식 열화 피해가 가장 심한 콘크리트 구조물 중 하수암거, 차집관거 등은 내부가 항상 습윤상태이기 때문에 보수 모르타르의 부착력을 저하하는 열악한 환경이다.In addition, among the concrete structures that are most severely damaged by chemical corrosion deterioration, sewage culverts and pipelines are a poor environment that reduces the adhesion of repair mortar because the interior is always wet.
등록특허 10-1461190호 "자기치유 터널 라이닝 콘크리트"는 콘크리트에 균열 발생시 에트링자이트 생성계 팽창성 화합물을 이용하여 균열부를 복구하는 방식의 자기치유 콘크리트에 대한 기술로서, 이 에트링자이트 생성물은 적정량일 경우 균열복구에 어느 정도 효과가 있으나 콘크리트의 황산염 침식 생성물인 이수석고와 콘크리트 수화생성물인 모노설페이트의 가역반응을 통해 계속 팽창을 유도하여 콘크리트의 열화를 가속화할 수 있다. 따라서, 하수암거 또는 차집관거 등과 같이 오·폐수로 인한 화학적 반응 즉, 황산염 침식 등에 의해 콘크리트의 열화가 가속화되는 환경에서는 이 특허의 에트링자이트 생성물을 이용한 방법은 적합하지 않다.Registered Patent No. 10-1461190 "Self-healing tunnel lining concrete" is a technology for self-healing concrete that recovers cracks by using an intumescent compound that generates ethringite when a crack occurs in concrete. This ethringite product is In the case of an appropriate amount, it has some effect on crack recovery, but it can accelerate the deterioration of concrete by inducing expansion through the reversible reaction of dihydrate gypsum, which is a sulfate erosion product of concrete, and monosulfate, which is a hydration product of concrete. Therefore, the method using the ethringite product of this patent is not suitable in an environment where the deterioration of concrete is accelerated due to chemical reactions caused by wastewater, that is, sulphate erosion, such as a sewage culvert or a drainage conduit.
등록특허 10-1460498호 "자기 보수성 조성물 및 이를 이용한 콘크리트 구조물의 보수방법"은 자기보수 기능을 가지는 시멘트 결합재인 무수석고와 폴리머 혼화제를 이용한 기술로서 화학적 침식 열화가 심한 콘크리트 구조물의 균열부를 자기 보수하는 방식의 보수 모르타르에 대한 기술이다. 이 특허의 주요 내용은 시멘트 결합재 중 무수석고가 시멘트 중의 성분인 C3A와 반응하여 에트링자이트를 생성시켜 균열부 및 공극을 치밀하게 채워줌으로써 외부 열화인자를 차단하여 콘크리트의 수명을 연장하는 것이다. 이 특허에는 황산염 또는 염해이온 등과 반응하여 생성된 3CaSO4·2H2O(이수석고)에 대한 언급은 전혀 없다. 그러나 이수석고는 콘크리트 열화요인 중 가장 중요한 생성물인 만큼 이수석고에 대한 화학적 제거 또는 화합반응을 통해 콘크리트 구조물의 자기보수가 가능한 조성물을 생성하도록 하는 것이 필요하다. 또한, 콘크리트가 열화된 후부터 내부에 에트링자이트가 계속 생성된다면 팽창성으로 인해 콘크리트 내부에 팽창균열을 발생시켜 오히려 구조물에 악영향을 미치는 원인이 될 수 있다. Registered Patent No. 10-1460498 "Self-repairing composition and repair method for concrete structures using the same" is a technology using anhydrous gypsum and a polymer admixture, which is a cement binder that has a self-repair function, and self-repairs cracks in concrete structures with severe chemical erosion deterioration. It is a technique for method repair mortar The main content of this patent is that anhydrous gypsum in the cement binder reacts with C 3 A, which is a component in the cement, to generate ethringite, which closely fills the cracks and voids, blocking external deterioration factors and extending the life of concrete. will be. In this patent, there is no mention of 3CaSO 4 ·2H 2 O (dihydrate gypsum) produced by reaction with sulfate or salt sea ions. However, since dihydrate gypsum is the most important product among concrete deterioration factors, it is necessary to create a composition capable of self-repair of concrete structures through chemical removal or compound reaction of dihydrate gypsum. In addition, if ethringite continues to be generated inside the concrete after deterioration, expansion cracks may occur inside the concrete due to its expandability, which may cause adverse effects on the structure.
본 발명의 목적은 콘크리트 구조물의 화학적 부식에 의해 발생한 생성물인 이수석고를 분해하고 이 과정에서 생성된 화합물과 2차 반응을 유도하여 재열화 발생을 억제하고 콘크리트 구조물의 수명을 영구적으로 유지하려는 것이다.An object of the present invention is to decompose dihydrate gypsum, a product produced by chemical corrosion of a concrete structure, and induce a secondary reaction with the compound produced in this process to suppress the occurrence of re-deterioration and to permanently maintain the life of the concrete structure.
또한, 본 발명의 목적은 항상 습윤 상태에 있는 콘크리트 구조물이 부착력을 상실하지 않고 성능을 유지하도록 하는 것이다.In addition, it is an object of the present invention to maintain the performance of a concrete structure that is always in a wet state without losing adhesion.
이뿐만 아니라, 본 발명의 목적은 오·폐수로 인한 환경오염을 방지하고 수질개선 성능을 부여하려는 것이다.In addition, it is an object of the present invention to prevent environmental pollution due to wastewater and to impart water quality improvement performance.
상기 목적을 달성하기 위하여 본 발명자들은 보수 부위의 재열화 발생시점에 탈황 및 탄화수소를 분리할 수 있는 2차 반응 유도제(제올라이트, 수산화마그네슘 등)를 통해 황화수소를 제거하도록 하였다. 이후 생성된 수산화칼슘(Ca(OH)2)은 활성 포졸란 재료와 2차 반응 즉, 포졸란 반응하여 장기적으로 내구성이 우수한 표피를 생성시켰다.To achieve the above object, the present inventors have removed hydrogen sulfide through a secondary reaction inducing agent (zeolite, magnesium hydroxide, etc.) capable of separating desulfurization and hydrocarbons at the time of re-deterioration of the repair site. The resulting calcium hydroxide (Ca(OH) 2 ) was then reacted with an active pozzolanic material, that is, a pozzolanic reaction, resulting in a long-term durable epidermis.
또한, 본 발명자들은 모르타르에 염화칼슘, 실리카겔, 활성알루미나 등의 흡습제를 혼합하여 습윤상태에서의 시공성을 개선하였다.In addition, the present inventors improved workability in a wet state by mixing a desiccant such as calcium chloride, silica gel, and activated alumina in the mortar.
이뿐만 아니라, 본 발명자들은 메타카올린 등의 미세 다공체 재료를 통해 오·폐수에 함유된 유해물질을 흡착하여 일부 수질개선 능력을 부여하였다.In addition, the present inventors have given the ability to improve some water quality by adsorbing harmful substances contained in wastewater through microporous materials such as metakaolin.
본 발명은The present invention
골재 20~60중량%, 20-60% by weight of aggregate,
시멘트 10~50중량%, 10-50% by weight of cement,
황산염으로 인해 생성된 이수석고와 화학반응 하여 황을 분리하는 촉매제 1~5중량%, 1 to 5% by weight of a catalyst that separates sulfur by chemically reacting with the dihydrate gypsum produced by sulfate,
촉매제에 의해 생성된 황과 수산화염을 흡착하여 포졸란 반응을 유도하는 2차 반응 유도제 1~10중량% 및1 to 10% by weight of a secondary reaction inducing agent that induces a pozzolanic reaction by adsorbing sulfur and hydroxide generated by the catalyst, and
시멘트와 물이 반응하여 생긴 수산화칼슘과 2차로 포졸란 반응을 하여 장기강도 및 내구성을 높이는 활성 포졸란 재료 5~20중량%를 포함하는 자기 보수성 모르타르 조성물에 관한 것이다.It relates to a self-retaining mortar composition comprising 5 to 20% by weight of an active pozzolanic material that increases long-term strength and durability by secondary pozzolanic reaction with calcium hydroxide produced by the reaction of cement and water.
또한, 본 발명은 상기 활성 포졸란 재료가 실리카흄, 고로슬래그, 플라이애시 및 메타카올린 중 선택된 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, characterized in that the active pozzolanic material is at least one selected from silica fume, blast furnace slag, fly ash and metakaolin.
또한, 본 발명은 상기 활성 포졸란 재료가 메타카올린 : 고로슬래그 = 0.1~0.4 : 0.6~0.9로 혼합된 것임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, characterized in that the active pozzolan material is mixed with metakaolin: blast furnace slag = 0.1 to 0.4: 0.6 to 0.9.
또한, 본 발명은 상기 촉매제가 황산염임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, wherein the catalyst is a sulfate salt.
또한, 본 발명은 상기 촉매제로서 황산염이 황산칼륨, 황산암모늄 및 황산마그네슘 중 선택된 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, characterized in that the sulfate as the catalyst is at least one selected from potassium sulfate, ammonium sulfate and magnesium sulfate.
또한, 본 발명은 상기 2차 반응 유도제가 제올라이트 및 수산화마그네슘 중 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, characterized in that the secondary reaction inducing agent is at least one of zeolite and magnesium hydroxide.
또한, 본 발명은 상기 2차 반응 유도제가 제올라이트 : 수산화마그네슘 = 0.1~0.3 : 0.7~0.9로 혼합된 것임을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition, wherein the secondary reaction inducing agent is mixed with zeolite: magnesium hydroxide = 0.1 to 0.3: 0.7 to 0.9.
또한, 본 발명은 보수 부위의 수분을 흡수하는 흡습제를 1~3중량% 더 포함하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition further comprising 1 to 3% by weight of a desiccant that absorbs moisture in the repair site.
또한, 본 발명은 CSA, 생석회, 반수석고 및 탄산칼슘 중 선택된 1종 이상의 수축저감재를 5~15중량% 더 포함하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition further comprising 5 to 15% by weight of at least one shrinkage reducing material selected from CSA, quicklime, hemihydrate gypsum and calcium carbonate.
또한, 본 발명은 접착력과 작업성을 향상하기 위한 친수성 분말 수지를 0.5~2중량% 더 포함하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition further comprising 0.5 to 2% by weight of a hydrophilic powder resin for improving adhesion and workability.
또한, 본 발명은 모르타르 조성물의 물 비율을 감소시켜 강도 및 내구성을 증진하는 유동화제를 0.01~2중량% 더 포함하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention relates to a self-retaining mortar composition further comprising 0.01 to 2% by weight of a fluidizing agent for improving strength and durability by reducing the water ratio of the mortar composition.
이뿐만 아니라, 본 발명은 상기 자기 보수성 모르타르 조성물이 일반 콘크리트 구조물 보수용으로만 아니라, 하수암거, 차집관거, 정수장, 하수처리장, 저류조 등과 같이 물을 가두거나 물과 많이 접하는 콘크리트 구조물 보수용으로 특히 유용함을 특징으로 하는 자기 보수성 모르타르 조성물에 관한 것이다.In addition, the present invention is particularly useful for repairing concrete structures in which the self-repairing mortar composition is not only for repairing general concrete structures, but also for confining water or in contact with water, such as sewage culverts, drainage pipes, water purification plants, sewage treatment plants, storage tanks, etc. It relates to a self-retaining mortar composition, characterized in that.
본 발명의 자기 보수성 모르타르 조성물은 콘크리트 구조물의 화학적 부식에 의해 발생한 생성물인 이수석고를 분해하고 이 과정에서 생성된 화합물과 2차로 포졸란 반응을 유도하여 장기적으로 내구성이 우수한 표피를 생성시켜 구조물의 강도를 높였다.The self-repairing mortar composition of the present invention decomposes dihydrate gypsum, a product generated by chemical corrosion of a concrete structure, and induces a pozzolanic reaction with the compound produced in this process secondarily to create a long-term durable skin to increase the strength of the structure. .
또한, 본 발명의 자기 보수성 모르타르 조성물은 염화칼슘, 실리카겔, 활성알루미나 등과 같은 흡습제를 혼합하여 습윤상태에서의 시공성을 개선하였다.In addition, the self-retaining mortar composition of the present invention improves workability in a wet state by mixing a desiccant such as calcium chloride, silica gel, activated alumina, and the like.
이뿐만 아니라, 본 발명의 자기 보수성 모르타르 조성물은 미세다공체를 더 포함하여 오·폐수에 함유된 유해물질을 흡착하여 수질개선 성능을 부여하였다.In addition, the self-retaining mortar composition of the present invention has improved water quality by adsorbing harmful substances contained in wastewater including microporous bodies.
도 1은 본 발명의 자기 보수성 모르타르 조성물을 구조물 보수에 적용했을 때 자기 보수 기작을 보여주는 모식도이다.1 is a schematic diagram showing a self-repairing mechanism when the self-repairing mortar composition of the present invention is applied to a structure repair.
콘크리트 구조물에서 일반적인 황산염 침식과정은 아래 화학식과 같이 일어난다.In concrete structures, the general sulfate erosion process occurs as shown in the formula below.
C2S(C3S) + H2O → CSH + Ca(OH)2 : 보수 후 일반 콘크리트C 2 S(C 3 S) + H 2 O → CSH + Ca(OH) 2 : General concrete after repair
Ca(OH)2 + SO3 + H2O → CaSO4·2H2O : 황산염과 반응하여 이수석고를 생성하며, 이수석고가 팽창 요인이 된다.Ca(OH) 2 + SO 3 + H 2 O → CaSO 4 ·2H 2 O: reacts with sulfate to form dihydrate gypsum, and dihydrate gypsum becomes a factor of expansion.
3CaO·Al2O3·CaSO4·12H2O + CaSO4·2H2O + H2O → 3CaO·Al2O3·3CaSO4·32H2O : 이미 생성된 모노설페이트와 가역반응을 통해 에트링자이트를 생성하며, 이는 열화를 가속화하는 요인이 된다.3CaO·Al 2 O 3 ·CaSO 4 ·12H 2 O + CaSO 4 ·2H 2 O + H 2 O → 3CaO·Al 2 O 3 ·3CaSO 4 ·32H 2 O: Eth through reversible reaction with already formed monosulfate It generates ringite, which is a factor that accelerates deterioration.
본 발명자들은 이러한 문제를 아래 표시한 화학식과 같이 해결하였다.The present inventors solved this problem as shown in the formula shown below.
C2S(C3S) + H2O → CSH + Ca(OH)2 : 일반 모르타르 보수 후 수산화칼슘이 생성된다.C 2 S(C 3 S) + H 2 O → CSH + Ca(OH) 2 : Calcium hydroxide is produced after general mortar repair.
Ca(OH)2 + SO3 + H2O → 3CaSO4·2H2O : 수산화칼슘이 황산염과 반응하여 이수석고를 생성한다.Ca(OH) 2 + SO 3 + H 2 O → 3CaSO 4 ·2H 2 O: Calcium hydroxide reacts with sulfate to form dihydrate gypsum.
3CaSO4·2H2O + K2SO4 = 2K(OH)3 + 3H2SO4 + 3CaSO4 : 이수석고와 촉매제인 황산염의 화학반응으로 황산과 석고가 생성된다.3CaSO 4 ·2H 2 O + K 2 SO 4 = 2K(OH) 3 + 3H 2 SO 4 + 3CaSO 4 : Sulfuric acid and gypsum are produced by a chemical reaction between dihydrate gypsum and sulfate as a catalyst.
2K(OH)3 + 3H2SO4 + 3CaSO4 + 2차 반응 유도제(제올라이트, 수산화마그네슘 등) → Ca(OH)2 : 생성물은 이후 2차 반응 유도제와 반응하여 황산과 수산화염(이 반응식에서는 수산화칼륨)이 제거되며, 결국 수산화칼슘이 생성된다.2K(OH) 3 + 3H 2 SO 4 + 3CaSO 4 + Secondary reaction inducing agent (zeolite, magnesium hydroxide, etc.) → Ca(OH) 2 : The product is then reacted with the second reaction inducing agent to remove sulfuric acid and hydroxide (potassium hydroxide in this reaction formula), resulting in calcium hydroxide.
Ca(OH)2 + 활성 포졸란 재료(실리카흄, 고로슬래그, 플라이애시 등) → 2차 반응(포졸란 반응) : 생성된 수산화칼슘은 실리카흄, 고로슬래그, 플라이애시 등의 활성 포졸란 재료와 2차 반응 즉, 포졸란 반응을 통하여 내화학성 및 내구성이 우수한 매트릭스를 생성한다.Ca(OH) 2 + active pozzolanic material (silica fume, blast furnace slag, fly ash, etc.) → Secondary reaction (pozzolanic reaction): The generated calcium hydroxide is a secondary reaction with active pozzolanic materials such as silica fume, blast furnace slag, and fly ash. Through the pozzolanic reaction, a matrix with excellent chemical resistance and durability is produced.
본 발명의 자기 보수성 모르타르 조성물은 재료의 성상에 따라 골재와 분체로 나눌 수 있다. 분체로는 시멘트, 활성 포졸란 재료, 2차 반응 유도제, 촉매제, 흡습제, 수축저감재, 분말 수지 및 유동화제를 들 수 있다. 이들 중 본 발명 조성물에 필수적인 구성요소로는 골재, 시멘트, 활성 포졸란 재료, 촉매제, 2차 반응 유도제를 들 수 있고, 흡습제, 수축저감재, 분말 수지 또는 유동화제는 본 발명의 자기 보수성 모르타르 조성물의 기능을 더욱 향상시키기 위해 추가로 혼합할 수 있다. The self-retaining mortar composition of the present invention can be divided into aggregate and powder according to the properties of the material. The powder includes cement, an active pozzolanic material, a secondary reaction inducing agent, a catalyst, a desiccant, a shrinkage reducing agent, a powder resin, and a fluidizing agent. Among these, essential components of the composition of the present invention include aggregate, cement, active pozzolanic material, catalyst, and secondary reaction inducing agent, and the desiccant, shrinkage reducing material, powder resin, or fluidizing agent is the self-retaining mortar composition of the present invention. Additional blends can be made to further enhance functionality.
아래에서는 본 발명의 자기 보수성 모르타르 조성물의 구성요소들의 특징과 기능, 조성 등을 살펴본다. In the following, features, functions, and compositions of the components of the self-retaining mortar composition of the present invention will be described.
골재는 잔골재가 바람직하며, 자연사 또는 인조규사 중 #5호사와 #7호사를 0.4~0.5 : 0.5~0.6 비율로 혼합하는 것이 가장 적합하다. 골재는 모르타르의 수축률을 보상하기 위해 혼합되는 재료이다. 골재는 전체 모르타르 조성물 중 20~60%(w/w)를 차지한다. 이하 특별한 설명이 없는 % 표시는 중량비를 나타낸다. 골재가 20% 미만인 경우 상대적으로 분체 비율이 높아져 모르타르 조성물의 수축률이 매우 커진다. 또한, 골재가 60%를 초과하는 경우 분체 비율이 낮아져 내부 공극률이 높아지므로 강도와 내구성이 저하된다. The aggregate is preferably fine aggregate, and it is most suitable to mix #5 and #7 among natural or artificial silica in a ratio of 0.4 to 0.5: 0.5 to 0.6. Aggregate is a material that is mixed to compensate for the shrinkage rate of the mortar. Aggregate accounts for 20-60% (w/w) of the total mortar composition. Unless otherwise specified, percentages indicate weight ratios. When the amount of aggregate is less than 20%, the proportion of powder is relatively high, and the shrinkage rate of the mortar composition is very large. In addition, when the amount of the aggregate exceeds 60%, the powder ratio is lowered and the internal porosity is increased, so that the strength and durability are deteriorated.
시멘트는 전체 모르타르 조성물 중 10~50%가 바람직하고, 종류에 특별한 제한은 없으나 바람직하게는 계절에 따라 하절기에는 포틀랜드 시멘트, 동절기에는 속경성 시멘트를 사용할 수 있다. 혼합되는 시멘트가 10% 미만이면 초기강도 및 내구성이 매우 낮아진다. 60%를 초과하는 경우에는 점도가 높아져 작업성이 떨어지며, 수축에 의한 균열이 발생한다.Cement is preferably 10 to 50% of the total mortar composition, and there is no particular limitation on the type, but preferably Portland cement in summer and fast-hardening cement in winter may be used depending on the season. If the amount of cement to be mixed is less than 10%, initial strength and durability are very low. If it exceeds 60%, the viscosity increases, resulting in poor workability, and cracks due to shrinkage occur.
활성 포졸란 재료는 시멘트와 물이 반응하여 생긴 수산화칼슘(Ca(OH)2)과 2차 반응하여 장기강도 및 내구성을 높이는 무기계 혼화재료이다. 활성 포졸란 재료의 종류에 특별한 제한은 없고, 실리카흄, 고로슬래그, 플라이애시 등 다양한 활성 포졸란 재료를 이용할 수 있으나, 메타카올린과 고로슬래그를 0.1~0.4 : 0.6~0.9 비율로 혼합하는 것이 장기강도 및 내구성 측면에서 더욱 바람직하며, 활성 포졸란 재료를 가하는 경우 염화물 이온 침투 억제에 의한 철근의 발청 억제와 황산염 등에 대한 화학저항성이 향상되는 효과가 나타난다. 활성 포졸란 재료는 5% 미만을 가하는 경우 장기강도 및 내화학성이 저하되며, 20%를 초과하는 경우 팽창률이 높아져 내부 공극이 증가하여 강도가 현저히 낮아진다.The active pozzolanic material is an inorganic admixture that increases long-term strength and durability by secondary reaction with calcium hydroxide (Ca(OH) 2 ) produced by the reaction of cement and water. There is no particular limitation on the type of active pozzolanic material, and various active pozzolanic materials such as silica fume, blast furnace slag, and fly ash can be used, but mixing metakaolin and blast furnace slag in a ratio of 0.1 to 0.4: 0.6 to 0.9 is long-term strength and durability. It is more preferable from the side, and when the active pozzolanic material is added, the effect of inhibiting the rusting of the reinforcing bar by inhibiting the penetration of chloride ions and improving the chemical resistance to sulfate, etc. is exhibited. When the active pozzolanic material is added less than 5%, long-term strength and chemical resistance are deteriorated, and when it exceeds 20%, the expansion rate increases and the internal voids increase, resulting in significantly lower strength.
2차 반응 유도제로서 제올라이트 및/또는 수산화마그네슘은 촉매제에 의해 생성된 황과 수산화칼륨을 흡착하여 결국 수산화칼슘만 남게 함으로써 포졸란 반응을 안정적으로 유도하는 재료이다. 제올라이트와 수산화마그네슘 중 1종 이상을 사용할 수 있으며, 더욱 바람직하게는 제올라이트와 수산화마그네슘을 0.1~0.3 : 0.7~0.9 비율로 혼합, 사용하는 경우 포졸란 반응이 가장 잘 일어난다. 2차 반응 유도제가 1% 미만인 경우 열화 억제에 효과가 없으며, 10%를 초과하는 경우에는 2차 반응 유도제가 다공성 구조이기 때문에 수분 흡수력이 상당하여 소요되는 배합수량이 증가하고 콘크리트의 강도가 현저히 낮아진다.As a secondary reaction inducing agent, zeolite and/or magnesium hydroxide is a material that stably induces a pozzolanic reaction by adsorbing sulfur and potassium hydroxide produced by the catalyst, leaving only calcium hydroxide. At least one of zeolite and magnesium hydroxide may be used, and more preferably, when zeolite and magnesium hydroxide are mixed and used in a ratio of 0.1 to 0.3: 0.7 to 0.9, the pozzolanic reaction most often occurs. If the secondary reaction inducing agent is less than 1%, there is no effect on deterioration suppression, and if the secondary reaction inducing agent is more than 10%, the secondary reaction inducing agent has a porous structure, so the water absorption capacity is significant, so the amount of mixing required increases and the strength of concrete decreases significantly. .
촉매제로서 황산칼륨, 황산암모늄, 황산마그네슘 등 다양한 황산염 중에서 1종 이상 선택되는 황산염은 황산염으로 인해 발생한 CaSO4·2H2O(이수석고)와 화학반응을 통해 황을 분리하여 2차 반응 유도제와 반응하도록 촉매작용을 한다. 황산염 첨가량은 1~5%가 적량이며, 1% 미만인 경우 황 분리효과가 미미하며, 5%를 초과하는 경우 황산염의 흡수성이 높아 초기 강도가 낮아진다.As a catalyst, one or more sulfates selected from a variety of sulfates such as potassium sulfate, ammonium sulfate, and magnesium sulfate are reacted with a secondary reaction inducing agent by separating sulfur through a chemical reaction with CaSO 4 ·2H 2 O (dihydrate gypsum) generated by sulfate. It catalyzes to do. The amount of sulfate added is 1 to 5%, and if it is less than 1%, the sulfur separation effect is insignificant, and if it exceeds 5%, the initial strength is lowered due to high absorption of sulfate.
흡습제는 보수 부위에서 수분을 흡수하는 재료로서, 표면을 건조한 후 시공하는 기존 기술과 달리 수분이 있는 상태에서도 부착력 상실을 억제할 수 있다. 흡습제로는 본 발명의 모르타르 조성물의 기능에 악영향을 미치지 않는 것이면 특별한 제한은 없고, 바람직하게는 염화칼슘, 실리카겔 및 활성알루미나 중 1종 이상을 단독 또는 혼합하여 사용할 수 있다. 흡습제가 1% 미만인 경우에는 수분 흡수력 개선 효과가 없고, 3%를 초과하면 혼입 과다로 인해 모르타르 내 수분까지 흡수하여 모르타르 조성물의 강도 및 내구성을 약화시킨다.The desiccant is a material that absorbs moisture in the repair area, and unlike the existing technology to construct after drying the surface, it can suppress loss of adhesion even in the presence of moisture. The desiccant is not particularly limited as long as it does not adversely affect the function of the mortar composition of the present invention, and preferably, one or more of calcium chloride, silica gel, and activated alumina may be used alone or in combination. If the desiccant is less than 1%, there is no effect of improving water absorption, and if it exceeds 3%, it absorbs even moisture in the mortar due to excessive mixing and weakens the strength and durability of the mortar composition.
수축저감재는 잔골재가 제어할 수 없는 자기수축량 보상을 위해 혼입되는 재료로서, 예컨대 CSA, 생석회, 반수석고 및 탄산칼슘 중 1종 이상을 단독 또는 혼합하여 사용할 수 있다. 수축저감재는 5% 미만인 경우 수축량 보상효과가 미미하며, 15% 초과시 콘크리트의 급격한 팽창으로 인해 강도가 낮아진다.The shrinkage reducing material is a material that is mixed to compensate for the amount of self-shrinkage that the fine aggregate cannot control. For example, one or more of CSA, quicklime, hemihydrate gypsum, and calcium carbonate may be used alone or in combination. If the shrinkage reducing material is less than 5%, the shrinkage compensation effect is insignificant, and if it exceeds 15%, the strength decreases due to the rapid expansion of the concrete.
분말 수지는 보수 모르타르의 접착력과 작업성 향상을 위해 혼입되는 재료로서 친수성 아크릴계 합성 분말 수지를 사용한다. 분말 수지가 0.5% 미만이면, 접착력이 저하되며, 2%를 초과하면 단가가 높아져 경제성이 떨어진다.The powdered resin is a material that is mixed to improve the adhesion and workability of the repair mortar, and a hydrophilic acrylic synthetic powder resin is used. When the amount of the powdered resin is less than 0.5%, the adhesive strength decreases, and when the amount exceeds 2%, the unit cost increases, resulting in poor economy.
유동화제는 보수 모르타르의 물/결합재 비를 감소시켜 강도 및 내구성을 증진하기 위해 혼입되는 재료로서 나프탈렌계, 폴리카르본산계 또는 멜라민계를 사용할 수 있으나, 나프탈렌계는 유동성 반응이 늦어 작업성이 떨어지며, 폴리카르본산계는 벽체나 천장에서 주르륵 흐르는 성질로 인해 초기 접착력을 상실시킬 우려가 있으므로 초기접착력 및 작업성 향상을 위해 멜라민계를 사용하거나 적량 혼합하여 사용하는 것이 바람직하다. 유동화제가 0.01% 미만인 경우 점도가 매우 높아져 혼합이 어렵고 작업성이 저하되며, 2%를 초과하는 경우에는 재료 분리가 매우 심해지며 추후 수축, 강도저하, 내구성 저하를 일으킬 수 있다.As a fluidizing agent, naphthalene-based, polycarboxylic acid-based, or melamine-based material can be used as a material that is mixed to improve strength and durability by reducing the water/binder ratio of the repair mortar, but naphthalene-based is slow in fluidity reaction, resulting in poor workability. In order to improve initial adhesion and workability, it is preferable to use melamine or mix appropriate amounts of polycarboxylic acid as there is a risk of loss of initial adhesion due to the property of flowing through the wall or ceiling. If the fluidizing agent is less than 0.01%, the viscosity is very high, making mixing difficult and workability deteriorated, and if it exceeds 2%, the material separation becomes very severe, and it may cause shrinkage, strength decrease, and durability decrease.
본 발명의 자기 보수성 모르타르 조성물은 화학적 침식 생성물인 이수석고를 화학적 촉매반응으로 분리하고, 콘크리트에 이로운 수산화칼슘을 생성하여 포졸란 반응을 유도함으로써 장기적으로 콘크리트 수명을 연장할 수 있도록 해준다. 또한, 본 발명의 조성물에서 제올라이트는 황 이온을 제거하는 역할을 수행하며, 본 발명의 조성물 중 황산염은 이수석고와 반응하여 황 이온을 분리하는 촉매제로서 작용한다. 본 발명에서는 에트링자이트의 생성을 원천적으로 차단함으로써 콘크리트 구조물의 수명을 안정적으로 연장할 수 있다.The self-retaining mortar composition of the present invention separates dihydrate gypsum, a chemical erosion product, through a chemical catalytic reaction, and generates calcium hydroxide that is beneficial to concrete, thereby inducing a pozzolanic reaction, thereby extending the life of concrete in the long term. In addition, the zeolite in the composition of the present invention plays a role of removing sulfur ions, and the sulfate in the composition of the present invention acts as a catalyst for separating sulfur ions by reacting with dihydrate gypsum. In the present invention, it is possible to stably extend the life of the concrete structure by fundamentally blocking the generation of etringite.
반면, 한국특허 제1460498호 "자기 보수성 조성물 및 이를 이용한 콘크리트 구조물의 보수방법"은 에트링자이트를 생성하여 콘크리트 구조물의 균열부 및 공극을 밀실하게 채워 열화 요인을 차단하는 방식의 기술이며, 이 기술에서 제올라이트는 단순 흡착재에 불과하고, 황산알루미늄칼륨은 시멘트경화체의 수축을 제어하는 기능을 수행한다. 이 기술에서는 에트링자이트가 과다해지는 경우 급격한 팽창을 유도하여 오히려 구조물의 안정성에 악영향을 미칠 수 있다. On the other hand, Korean Patent No. 1460498 "Self-retaining composition and repair method for concrete structures using the same" is a technique of blocking deterioration factors by tightly filling cracks and voids of concrete structures by generating etringite. In technology, zeolite is merely an adsorbent, and potassium aluminum sulfate functions to control the shrinkage of the cement hardened body. In this technology, if ethringite becomes excessive, it induces rapid expansion and may adversely affect the stability of the structure.
침투 저항성Chloride ion
Penetration resistance
(부적합)Material separation
(incongruity)
Claims (12)
시멘트 10~50중량%,
황산염으로 인해 생성된 이수석고와 화학반응 하여 황을 분리하는 촉매제 1~5중량%,
촉매제에 의해 생성된 황과 수산화염을 흡착하여 포졸란 반응을 유도하는 2차 반응 유도제 1~10중량%,
시멘트와 물이 반응하여 생긴 수산화칼슘과 2차로 포졸란 반응을 하여 장기강도 및 내구성을 높이는 활성 포졸란 재료 5~20중량%를 포함하는 자기 보수성 모르타르 조성물.
20-60% by weight of aggregate,
10-50% by weight of cement,
1 to 5% by weight of a catalyst that separates sulfur by chemically reacting with the dihydrate gypsum produced by sulfate,
1 to 10% by weight of a secondary reaction inducing agent that induces a pozzolanic reaction by adsorbing sulfur and hydroxide generated by the catalyst,
Self-retaining mortar composition comprising 5 to 20% by weight of an active pozzolanic material that increases long-term strength and durability by secondary pozzolanic reaction with calcium hydroxide produced by the reaction of cement and water.
상기 활성 포졸란 재료는 실리카흄, 고로슬래그, 플라이애시 및 메타카올린 중 선택된 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
The active pozzolanic material is a self-retaining mortar composition, characterized in that at least one selected from silica fume, blast furnace slag, fly ash, and metakaolin.
상기 활성 포졸란 재료는 메타카올린 : 고로슬래그 = 0.1~0.4 : 0.6~0.9로 혼합된 것임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method according to claim 2,
The active pozzolanic material is metakaolin: blast furnace slag = 0.1 to 0.4: self-retaining mortar composition, characterized in that the mixture of 0.6 to 0.9.
상기 촉매제는 황산염임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
The catalyst is a self-retaining mortar composition, characterized in that the sulfate.
상기 황산염은 황산칼륨, 황산암모늄 및 황산마그네슘 중 선택된 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method of claim 4,
The sulfate is a self-retaining mortar composition, characterized in that at least one selected from potassium sulfate, ammonium sulfate, and magnesium sulfate.
상기 2차 반응 유도제는 제올라이트 및 수산화마그네슘 중 1종 이상임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
The self-retaining mortar composition, characterized in that the secondary reaction inducing agent is at least one of zeolite and magnesium hydroxide.
상기 2차 반응 유도제는 제올라이트 : 수산화마그네슘 = 0.1~0.3 : 0.7~0.9로 혼합된 것임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method of claim 6,
The secondary reaction inducing agent zeolite: magnesium hydroxide = 0.1 ~ 0.3: self-retaining mortar composition, characterized in that the mixture of 0.7 ~ 0.9.
보수 부위의 수분을 흡수하는 흡습제를 1~3중량% 더 포함하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
Self-retaining mortar composition further comprising 1 to 3% by weight of a desiccant that absorbs moisture in the repair area.
CSA, 생석회, 반수석고 및 탄산칼슘 중 선택된 1종 이상의 수축저감재를 5~15중량% 더 포함하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
Self-retaining mortar composition further comprising 5 to 15% by weight of at least one shrinkage reducing material selected from CSA, quicklime, hemihydrate gypsum and calcium carbonate.
접착력과 작업성을 향상하기 위한 친수성 분말 수지를 0.5~2중량% 더 포함하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
Self-retaining mortar composition further comprising 0.5 to 2% by weight of a hydrophilic powder resin for improving adhesion and workability.
모르타르 조성물의 물 비율을 감소시켜 강도 및 내구성을 증진하는 유동화제를 0.01~2중량% 더 포함하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
Self-retaining mortar composition further comprising 0.01 to 2% by weight of a fluidizing agent to improve strength and durability by reducing the water ratio of the mortar composition.
상기 자기 보수성 모르타르 조성물은 하수암거 또는 차집관거의 콘크리트 구조물 보수용임을 특징으로 하는 자기 보수성 모르타르 조성물.
The method according to claim 1,
The self-repairing mortar composition is a self-repairing mortar composition, characterized in that for repairing a concrete structure of a sewage culvert or a car collection pipe.
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| KR20140064766A (en) * | 2011-07-01 | 2014-05-28 | 잇판자이단호진 세이산기쥬츠켄큐쇼레이카이 | Repairing material for cracks accompanied with water leakage in concrete structure and process for repairing said cracks using said repairing material |
| KR101194714B1 (en) * | 2012-05-08 | 2012-10-25 | 주식회사 성현건설 | Mortar composition with function of sulfuric acid resistance using silica for repairing concrete structure and method for recovering the same thereof |
| KR101308084B1 (en) | 2013-02-21 | 2013-09-12 | 주식회사 인트켐 | Repairing method of reinforced concrete structures using inorganic self-healing materials |
| KR101461190B1 (en) | 2014-03-17 | 2014-11-18 | 주식회사 인트켐 | Self-Healing Tunnel Lining Concrete |
| KR101460498B1 (en) | 2014-04-11 | 2014-11-13 | 주식회사 이에스피소재 | Compositions of self water absorbing type retentive and repair method for concrete structures using the same |
| KR20170044402A (en) * | 2015-10-15 | 2017-04-25 | 주식회사 세릭 | High sulfate resistant inorganic binders, cement paste, mortar and concrete composite with crack self-healing function |
| KR101832164B1 (en) | 2017-09-06 | 2018-02-27 | 리플래시기술 주식회사 | Self-healing eco-friendly cement mortar composition for repairing structure and repairing method of structure therewith |
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