KR20060112748A - High strength underwater concrete admixture based on silane system - Google Patents
High strength underwater concrete admixture based on silane system Download PDFInfo
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Abstract
본 발명은 수중콘크리트 공사에 적용되는 고강도 콘크리트 혼화제에 관한 것으로, 특히 염에 의한 노화의 방지와 염소이온 등에 강한 화학적 기능을 갖은 채 강력한 침투성을 발휘하는 저분자량 실란계(Silane)를 주성분으로 하여 우수한 내구성이 유지되는 수중콘크리트 구조물이 제공되도록 한 고강도 수중콘크리트 혼화제에 관한 것이다.The present invention relates to a high-strength concrete admixture that is applied to underwater concrete construction, in particular, excellent low-molecular weight silane (Silane) that exhibits strong permeability while having a strong chemical function, such as prevention of aging by salt and chlorine ion, etc. The present invention relates to a high strength underwater concrete admixture that is intended to provide durable underwater concrete structures.
이를 위하여 본 발명은 내황산염 시멘트, 입경 25mm이하의 조골재, 염분 성분이 제거된 조립율 2.92%의 규사질 세골재, CSA계 팽창제, 리그닌계 유동화제 및 물과 감수제로 혼합 구성되는 수중콘크리트 조성물에 있어서, 상기 조성물 배합시 골재에 도포될 수 있도록 저분자량 실란계 수지 28.33~29.0 중량%에 물을 혼합하여 고형분함량 42~68%와 비중 2.4의 침투형 무기질 혼화제가 마련되어 배합되도록 함을 특징으로 하고 있다.To this end, the present invention is a water-resistant concrete composition composed of sulfate resistant cement, coarse aggregates having a particle diameter of 25 mm or less, siliceous granules having a salt content of 2.92% of granules removed, CSA-based swelling agents, lignin-based fluidizing agents, and water and water-reducing agents, When the composition is blended, water is mixed with 28.33 to 29.0% by weight of low molecular weight silane-based resin so as to be applied to the aggregate, and a penetrating inorganic admixture having a solid content of 42 to 68% and specific gravity of 2.4 is provided.
Description
본 발명은 수중콘크리트 공사에 적용되는 고강도 콘크리트 혼화제에 관한 것이다.The present invention relates to a high strength concrete admixtures applied to underwater concrete construction.
특히, 본 발명의 혼화재는 염에 의한 노화의 방지와 염소이온 등에 강한 화학적 기능을 갖은 채 강력한 침투성을 발휘하는 저분자량 실란계(Silane)를 주성분으로 하여 수중콘크리트의 조성물에 사용되므로서, 우수한 내구성이 유지되는 수중콘크리트 구조물이 제공되도록 한 고강도 수중콘크리트 혼화제에 관한 것이다.In particular, the admixture of the present invention is used in the composition of underwater concrete with a low molecular weight silane (Silane) as a main component to prevent aging due to salts and to exhibit strong permeability while having a strong chemical function such as chlorine ion. It relates to a high strength underwater concrete admixture such that this retained underwater concrete structure is provided.
일반적으로, 각종 하천이나 항만 등의 토목구조물에 광범위하게 사용되고 있는 수중콘크리트는 그 대부분이 타설작업시의 편익을 위해 수중불분리콘크리트 시공방법을 적용하여 우수한 부착력과 밀실한 콘크리트 구조물의 구현을 도모하고 있다.In general, underwater concrete, which is widely used in various civil structures such as rivers and harbors, is applied to the construction of underwater unsepared concrete for the convenience of placing works, and promotes excellent adhesion and tight concrete structure. have.
그러므로 수중콘크리트와 관련된 품질개선은 주로 철근과 콘크리트와의 부착력 향상을 통해 높은 신뢰성과 오염없는 시공수역을 갖도록 일정한 점성을 유지하는 매개체로서의 수중불분리성 콘크리트 혼화제의 제공에 그 촛점이 모아지고 있었 으며 그 성과의 일부국 내외에 특허 또는 건설신기술로 설정등록되어 있다.Therefore, the improvement of quality related to underwater concrete was mainly focused on the provision of water-indissolvable concrete admixtures as a medium that maintains a consistent viscosity so as to have high reliability and pollution-free construction water through improved adhesion between rebar and concrete. It has been registered and registered as a patent or new construction technology in some countries.
상기 혼화제로는 종래 셀룰로스 에테르계 중점제를 사용하여 콘크리트의 점성을 높여주거나 혹은 실리카흄, 메타카올린, CSA계의 클링커나 에트링자이트 및 Ca(OH)2의 팽창성 혼화제국 사용되었으나, 일정 시간의 경과에 따라 화학반응의 분화작용에 따른 기능저하국 우려되었고 또한 팽창성분에 따라 수화경화체의 조직 붕괴국 염려된다는 폐단에 따라 최근에는 포졸란계의 산업폐기물인 플라이애쉬, 슬래그 미분말, 폐제올라이트 등을 혼화제로 대체사용하고 있으나, 이 경우에도 동/하절기의 기온 편차에 대한 적응성이 낮아 시공성이 좋지 못하였다.The admixture is conventionally used to increase the viscosity of the concrete by using a cellulose ether-based middle agent, or an expandable admixture of silica fume, metakaolin, CSA-based clinker or ettringite and Ca (OH) 2 , Recently, due to the risk of functional degradation due to differentiation of chemical reactions and concern of tissue decay of hydration hardeners due to expansion components, recently, pozzolanic industrial wastes such as fly ash, fine slag powder, and waste zeolite are admixed. However, even in this case, the construction performance was not good because of the low adaptability to the temperature variation in winter and summer.
그러나 무엇보다도 수중에 타설되어 시공되는 콘크리트 구조물은 수중이라는 특수한 환경상 염에 의해 빠른 노화현상을 보이고 있으며, 수화열에 의한 온도상승과 염소이온에 반응한 잦은 화학적 부식으로 강도와 내구성의 저하를 수반한다는 치명적인 폐단을 내포하고 있다.Most of all, however, concrete structures that are poured and constructed show rapid aging due to the special environmental salts of the water, and it is fatal that their strength and durability are accompanied by a temperature increase due to hydration heat and frequent chemical corrosion in response to chlorine ions. It implies the end.
특히 지상에 시공되는 콘크리트 구조물과 달리 수중콘크리트 구조물은 그 안정성 평국국 쉽지 않고 균열부위 등을 용이하게 발견할 수 없어 보수보강공사를 어렵게 할 뿐만 아니라 시공의 적기를 놓치기국 쉬워 과다한 비용과 시공이 곤란하다는 제반 문제점도 포함하고 있는 것이다.In particular, unlike concrete structures that are constructed on the ground, underwater concrete structures are not easy to find, so they cannot easily find cracks, which makes maintenance and reinforcement difficult, and it is easy to miss the right time for construction. It also includes all the problems.
이에 따라 경화후에도 안정적인 콘크리트 구조물로서의 기능유지국 국능하기 위해서는 노화현상과 화학적 부식을 방지할 별도의 효율적인 방안이 마련되어야 한다는 점은 건설업계와 보수보강업계의 오랜 숙원이었다.Accordingly, in order to function as a functional maintenance station as a stable concrete structure after hardening, it is a long-standing desire of the construction industry and the reinforcement industry that a separate and efficient way to prevent aging and chemical corrosion should be prepared.
그러므로 본 발명은 수중콘크리트 조성물에 침투형의 흡수방지제를 혼합조성할 경우 상기의 문제점을 해소할 수 있다는 점에 착안되었다.Therefore, the present invention has been conceived that the above problems can be solved by mixing the water-absorbing inhibitor in the concrete composition.
본 발명은 수중콘크리트 구조물이 염에 의해 노화되거나 염소이온 등으로 부식되는 것을 방지하여 구조물의 고강도 발현이 가능할 수 있도록 배려하고 동시에 화학 및 동결융해의 저항성 증대에 따른 내구성 향상과 수화열에 의한 콘크리트의 균열방지 및 그에 따른 저발열성 콘크리트 구조물이 시공될 수 있는 콘크리트 혼화제의 제공을 그 안출된 목적으로 한다.The present invention considers that the concrete structure of the underwater concrete structure is prevented from aging by salts or corroded by chlorine ions, so that high-strength expression of the structure is possible, and at the same time, the durability is improved due to the increased resistance of chemical and freeze-thawing and the cracking of concrete due to the heat of hydration. It is an object of the present invention to provide a concrete admixture that can be prevented and thus low heat generating concrete structures can be constructed.
본 발명의 다른 목적으로는 수중콘크리트를 조성하는 골재의 표면공극이 저분자량 실란계 수지의 도포화 침투에 따라 밀실하게 충진되어 입형개선과 동시에 흡수율 저하와 함께 장기적 사용을 보장하는 압축 및 인장강도의 향상이 가능할 수 있도록 함에도 있다.According to another object of the present invention, the surface voids of aggregates constituting underwater concrete are filled intactly according to the application penetration of low molecular weight silane-based resins, and thus the compression and tensile strength of long-term use as well as the improvement of the granularity and the absorption rate are reduced. It is also about making improvements possible.
상기의 목적 달성을 위하여 본 발명은 내황산염 시멘트, 입경 25mm이하의 조골재, 염분 성분이 제거된 조립율 2.92%의 규사질 세골재, CSA계 팽창제, 리그닌계 유동화제 및 물과 감수제로 혼합 구성되는 수중콘크리트 조성물에 있어서, 상기 조성물 배합시 골재에 도포될 수 있도록 저분자량 실란계 수지 28.33∼29.0 중량%에 물을 혼합하여 고형분함량 42∼68%와 비중 2.4의 침투형 무기질 혼화제가 마련되어 배합되도록 함을 특징으로 한다.In order to achieve the above object, the present invention is an underwater concrete composed of sulfuric acid cement, coarse aggregate of 25mm or less particle size, siliceous fine aggregate of 2.92% of granules from which salt component is removed, CSA-based expander, lignin-based fluidizing agent, and water and water-reducing agent. In the composition, water is mixed with 28.33 to 29.0% by weight of the low molecular weight silane-based resin so as to be applied to the aggregate when the composition is blended, so that a penetrating inorganic admixture having a solid content of 42 to 68% and a specific gravity of 2.4 is provided. It is done.
본 발명으로 제공되는 수중콘크리트 혼화재는 이하의 구체적인 설명을 통해 보다 명확한 상태로 재현될 수 있을 것이다.Underwater concrete admixture provided by the present invention may be reproduced in a more clear state through the following detailed description.
먼저 고강도 수중콘크리트 조성물을 구축함에 있어 210∼400kg/㎠의 필요강도를 구현하기 위해 마련되는 시멘트는 그 화학적 성질이 내황산염 5종의 시멘트로서 MgO 3.4%, SO3 2.0%, 감열감량 1.3%, C3A 3.8%의 물리적 성질을 유지하되, 경우에 따라 이러한 성질의 시멘트 치환과 조기 활성화를 위해 4000∼6000㎠/g의 분말도를 유지하는 저가의 포졸란계 플라이애쉬나 4000∼6000㎠/g의 분말도를 유지하는 슬래그 미분말을 시멘트에 적량 혼합하여 사용할 수 도 있다.First, cements prepared to realize the necessary strength of 210 to 400kg / ㎠ in the construction of high strength underwater concrete composition have five sulphates as the chemical properties of MgO 3.4%, SO 3 2.0%, thermal loss 1.3%, A low-cost pozzolanic fly ash or 4000-6000 cm 2 / g of C 3 A that retains a physical property of 3.8% but in some cases maintains a powder level of 4000-6000 cm 2 / g for cement replacement and early activation of this property. The fine slag powder to maintain the powder degree of may be mixed with cement in an appropriate amount.
이때 시멘트 치환량을 중량 대비 10∼45%만큼 확대하여도 콘크리트에서 우려될 만한 팽창 현상은 발생되지 않는다.At this time, even if the cement replacement amount is increased by 10 to 45% by weight, the expansion does not occur in the concrete.
조골재는 입경 25mm이하의 쇄석으로 조립율 6.82%와 비중 2.70정도의 물성을 유지하며, 세골재는 염분이 포함되어 있지 아니하거나 또는 제거된 조립율 2.92%와 비중 2.62정도의 물성을 유지토록 한다.The coarse aggregate is crushed stone with a particle diameter of 25mm or less and maintains the physical properties of 6.82% and specific gravity 2.70, while fine aggregates contain no salinity or removed 2.92% and specific gravity 2.62.
이후 배합된 콘크리트 페이스트의 무수축성을 위한 CSA계 팽창제와 수밀성과 유동성 증진을 위한 리그닌계 유동화제인 리그닌 설폰산염이 각각 총중량 대비 0.5∼5중량%로 마련되는데, 물과 감수제, AE 감수제로 구성되는 콘크리트 조성물의 배합비에 따라 적절히 그 혼합량을 달리하여 사용되도록 한다.Thereafter, the CSA-based expanding agent for shrinkage of the blended concrete paste and lignin sulfonate, which is a lignin-based fluidizing agent for improving watertightness and fluidity, are respectively prepared at 0.5 to 5% by weight, based on water, water reducing agent, and AE water reducing agent. Depending on the blending ratio of the composition, the amount of the mixture may be appropriately changed.
물론 상기 감수제는 혼합시 같은 중량%의 바인더로 대체될 수 있다.Of course, the water reducing agent may be replaced with the same weight% binder when mixed.
본 발명의 혼화제는 콘크리트 조성물과의 친화력 도모와 골재와의 부착력 특성을 갖는 것으로서, 조골재나 세골재에 살수 도포되거나 혹은 배치플랜트를 통해 다른 조성물과 함께 혼합되는데, 저분자량 실란계 28.33∼29.0 중량%에 물을 혼합시켜 고형분함량 42∼68%, 비중 2.4의 침투형 무기질 혼화제로 마련되며, 발수효과의 증대를 위해 배합전 세골재에 도포할 경우에는 입경 약 0.19∼0.27mm를 유지한 채 64.51∼64.60 중량%로 마련되는 세골재에 고르게 혼합처리하여 균질한 피막이 형성되도록 한 후 충분한 건조과정을 거쳐 다른 조성물과 배합될 수 있도록 한다.The admixture of the present invention has affinity with concrete composition and adhesion property with aggregate, and is sprayed onto coarse aggregate or fine aggregate, or mixed with other composition through batch plant, to low molecular weight silane system at 28.33 to 29.0 wt% It is composed of a water-insoluble inorganic admixture having a solid content of 42 to 68% and specific gravity of 2.4 by mixing water, and when applied to fine aggregate before blending to increase the water repellent effect, 64.51 to 64.60 weight while maintaining a particle size of about 0.19 to 0.27 mm After mixing evenly to the fine aggregate provided in% to form a homogeneous coating is allowed to be combined with other compositions through a sufficient drying process.
이러한 과정을 거쳐 시공되는 콘크리트 구조물은 압축강도(kgf/㎥)에서 3일 158∼174, 7일 192∼248, 28일 298∼346의 우수성을 유지하는 것으로 판명되고 있다.The concrete structure constructed through this process has been found to maintain superiority of 158 to 174 for 3 days, 192 to 248 for 7 days, and 298 to 346 for 28 days at compressive strength (kgf / m 3).
따라서 수중콘크리트 구조물 시공에 본 발명의 혼화제를 적용할 경우 장기간의 사용에도 염에 의해 노화되거나 염소이온 등으로 부식되는 것을 방지하여 구조물의 고강도 발현이 가능하고 또한 강도 및 내구성과 유동성의 증진 그리고 건조후의 수축감소에 따라 균일화 된 품질을 갖출 수 있으므로, 잦은 보수보강으로부터 자유로운 경제적인 수중콘크리트 시공이 가능해져 산업경제에 이바지할 수 있다는 실시상의 가치를 갖는다.Therefore, when the admixture of the present invention is applied to the construction of underwater concrete structures, it is possible to express high strength of the structure by preventing aging due to salts and corrosion by chlorine ions, even after long-term use, and also to enhance strength and durability and fluidity and after drying As it can have a uniform quality according to shrinkage reduction, it has a practical value that can contribute to the industrial economy by enabling economical underwater concrete construction free from frequent reinforcement.
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020050035325A KR20060112748A (en) | 2005-04-28 | 2005-04-28 | High strength underwater concrete admixture based on silane system |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020050035325A KR20060112748A (en) | 2005-04-28 | 2005-04-28 | High strength underwater concrete admixture based on silane system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100919493B1 (en) * | 2008-01-16 | 2009-09-28 | 박신 | Recycled Aggregates coated with Water-based Water Repellent Agent and Application to a Concrete Structure |
| KR20160142265A (en) | 2016-11-29 | 2016-12-12 | 청산화학(주) | Defoamer powder composition comprising filler and hydrophobic organic material |
-
2005
- 2005-04-28 KR KR1020050035325A patent/KR20060112748A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100919493B1 (en) * | 2008-01-16 | 2009-09-28 | 박신 | Recycled Aggregates coated with Water-based Water Repellent Agent and Application to a Concrete Structure |
| KR20160142265A (en) | 2016-11-29 | 2016-12-12 | 청산화학(주) | Defoamer powder composition comprising filler and hydrophobic organic material |
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