KR20190047421A - Self-compacting concrete composition containing flowable admixture - Google Patents
Self-compacting concrete composition containing flowable admixture Download PDFInfo
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
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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
- C04B28/02—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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- 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
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- 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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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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Abstract
Description
본 발명은 고유동성혼화제가 첨가되어 고유동성이 발현되면서도 재료분리에 대한 저항성이 향상된 자기충전 콘크리트 조성물에 관한 것이다.The present invention relates to a self-compacting concrete composition which is improved in resistance to material segregation by the addition of an olefinic admixture to exhibit high fluidity.
사회 전반에 걸친 급속한 발전은 교량, 도로, 철도 및 항만 등의 사회기반시설물에 대한 수요를 다량으로 창출하였으며, 콘크리트는 사회기반시설을 구축하기 위한 중요한 구조재료로서 안전성 및 내구성을 인정받고 있다. 그러나 최근 콘크리트 구조물이 대형화, 고층화 및 장대화 됨에 따라 콘크리트 단면은 복잡해지고 있으며 콘크리트 타설시 거푸집을 밀실하게 채우지 못하거나 과도한 다짐으로 인한 재료분리 현상 등의 문제점이 나타남에 따라 이러한 문제점을 해결하기 위하여 콘크리트의 성능 및 시공효율을 향상시킨 고유동 콘크리트의 현장적용이 요구되고 있다. Rapid development throughout society has created a large amount of demand for infrastructure facilities such as bridges, roads, railways and harbors. Concrete has been recognized as an important structural material for building infrastructure, safety and durability. However, recently, as the concrete structure has become larger, higher-layered, and longer-sized, the cross-section of the concrete has become complicated. In order to solve such a problem, problems such as a failure to fill the form when the concrete is laid or a material separation phenomenon due to excessive compaction appear, And the application of high - flowable concrete with improved performance and construction efficiency is required.
이러한 고유동 콘크리트는 고유동혼화제가 첨가되어 고유동성이 발현되도록 하는 경우가 많은데 기존 고유동혼화제는 슬럼프 배합에서 자기충전 콘크리트를 제조하기 위해 혼화제의 사용량이 기존 혼화제 사용량에 비해 약 0.5~0.8중량% 추가하여야 하는데 이처럼 혼화제를 과다 사용할 경우 고유동성은 확보될 수 있으나 재료분리가 발생하는 문제가 있다. 특히 콘크리트의 단위결합재량이 360kg/m3이하인 경우 즉 저분체 콘크리트의 경우 일정 혼화제 사용량을 초과하여 사용하면 재료분리가 발생되고 이러한 재료분리는 콘크리트의 강도를 저하시켜 피충전구조물에 콘크리트 타설시 성형이 불가능한 문제를 유발시킨다.In order to manufacture self-compacting concrete in slump formulations, the amount of admixture used is about 0.5 to 0.8 wt.% Relative to the amount of existing admixture, However, if the admixture is used in excess, high fluidity can be secured, but there is a problem that material separation occurs. Particularly, when the unit bonding amount of concrete is lower than 360kg / m 3 , that is, in case of low-powder concrete, the material separation occurs when the amount of the admixture exceeds the amount of the admixture. Such material separation lowers the strength of the concrete, This causes an impossible problem.
일 예로 대한민국 특허등록 제0888534호에서는 중량백분율로서 시멘트 조성물 20~25%, 물 5~10%, 골재 65~74.9% 및 고유동화제, 공기연행제, 점증제를 포함하는 혼화제 0.1~0.5%를 교반하는 과정으로 이루어지며, 상기 시멘트 조성물은 중량백분율로서 시멘트 36~44%, 플라이애시 18~22%, 고로슬래그 분말 27~37% 및 석회석 분말 9~11%를 포함하는 것을 특징으로 하는 고유동성 콘크리트 제조방법을 제시하고 있다.For example, Korean Patent Registration No. 0888534 discloses a cement composition containing 20 to 25% by weight of cement composition, 5 to 10% of water, 65 to 74.9% of aggregate, 0.1 to 0.5% of admixture containing a superplasticizer, air entraining agent, Wherein the cement composition comprises 36 to 44% by weight of cement, 18 to 22% of fly ash, 27 to 37% of blast furnace slag powder, and 9 to 11% of limestone powder as a weight percentage. And suggests a concrete manufacturing method.
그런데 상기 기술의 경우 고유동화제에 의해 고유동성이 확보될 수 있으나 재료분리에 대한 저항성을 기대할 수 없는 문제가 있다.However, in the case of the above technology, the high flowability can be ensured by the superplasticizer, but resistance to material separation can not be expected.
따라서, 본 발명은 고유동성혼화제가 비교적 미량이 첨가되어도 고유동성이 확보되면서 재료분리에 대한 저항성을 향상시킬 수 있는 자기충전 콘크리트를 제공하고자 함이다.Accordingly, it is an object of the present invention to provide a self-compacting concrete capable of improving the resistance to material separation while ensuring high fluidity even when a relatively small amount of the high-performance admixture is added.
상기 목적을 달성하기 위해 본 발명의 고유동성혼화제가 포함된 자기충전 콘크리트 조성물(이하 "본 발명의 조성물"이라함)은, 작업성능개선제 100중량부에 대해 재료분리저감제 2 내지 10중량부, 첨가제 80 내지 150중량부를 포함하는 고유동성혼화제가 포함되는 것을 특징으로 한다.To achieve the above object, the self-compacting concrete composition (hereinafter referred to as " the composition of the present invention ") containing the high-performance admixture of the present invention comprises 2 to 10 parts by weight of the material- And 80 to 150 parts by weight of an additive.
하나의 예로 고유동성혼화제는 전체 중량대비 0.1 내지 0.15중량부로 포함되는 것을 특징으로 한다.As one example, the high-performance compatibilizer is characterized by being contained in an amount of 0.1 to 0.15 parts by weight based on the total weight.
하나의 예로 상기 첨가제에는 보습제 10 내지 20중량부, 하이드록시에틸섬유소 10 내지 30중량부, 벤잘코늄염화물 1 내지 3중량부가 포함되는 것을 특징으로 한다. As one example, the additives include 10 to 20 parts by weight of a moisturizer, 10 to 30 parts by weight of hydroxyethyl cellulose, and 1 to 3 parts by weight of benzalkonium chloride.
본 발명의 조성물은 적정의 혼화제가 첨가되어 저분체임에도 고유동성이 발현됨과 동시에 재료분리에 대한 저항성 등 기타 물성을 향상시킬 수 있는 장점이 있다. The composition of the present invention is advantageous in that it can exhibit high fluidity even though it is a low powder added with an appropriate admixture and can improve other properties such as resistance to material separation.
도 1은 배합별 유동성 실험결과를 나타내는 그래프이고,
도 2는 고유동성혼화제 사용량에 따른 플로우시험 결과를 나타내는 그래프이고,
도 3은 고유동성혼화제 사용량에 따른 V-lot유하시간 측정결과를 나타내는 그래프이고,
도 4는 고유동성혼화제 사용량에 따른 U-Box단차 측정결과를 나타내는 그래프이다. FIG. 1 is a graph showing the results of fluidity experiment for each compound,
FIG. 2 is a graph showing a flow test result according to the amount of the high-
FIG. 3 is a graph showing the results of V-lot dropping time measurement according to the amount of the high-flowable admixture used,
4 is a graph showing the U-Box step difference measurement result according to the amount of the high-flowable admixture used.
이하 본 발명의 실시 예 및 실험 예를 첨부되는 도면을 통해 보다 상세히 설명하도록 한다.BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
본 발명의 조성물은 작업성능개선제 100중량부에 대해 재료분리저감제 2 내지 10중량부, 첨가제 80 내지 150중량부를 포함하는 고유동성혼화제가 포함되는 것을 특징으로 한다.The composition of the present invention is characterized in that the high-performance admixture comprises 2 to 10 parts by weight of the material separation reduction with respect to 100 parts by weight of the performance improver, and 80 to 150 parts by weight of the additive.
상기 작업성능개선제는 다양한 공지의 재질이 사용될 수 있으며, 일 예로 폴리카르본산계가 적용될 수 있다.As the performance improving agent, various known materials may be used, for example, a polycarboxylic acid-based material may be applied.
상기 폴리칼본산계의 경우 기존에 사용하던 혼화제에 비하여 우수한 감수성능을 발휘할 뿐만 아니라, 슬럼프 로스가 적고, 또한 우수한 혼련성을 가지는 특징이 있다. 이러한 폴리칼본산계는 1개의 주쇄와 측쇄로 구성되어 주쇄는 시멘트 입자의 간격을 넓혀 혼합수가 효과적으로 시멘트와 접촉하여 수화반응을 원활하게 하는 기능을 하여 주로 콘크리트의 감수효과를 높이는 역할을 하고, 측쇄는 시간에 따라 감소하는 콘크리트의 유동특성을 지연시켜 작업성 즉 유동성을 높이는 역할을 하는 것이다.In the case of the polycarboxylic acid type, the hydrocracking agent exhibits excellent water reducing performance as compared with the admixture used in the past, has a small slump loss, and has excellent kneading properties. The polycarboxylic acid system is composed of one main chain and side chains, and the main chain has a function to smooth the hydration reaction by effectively contacting the cement with the mixed water by widening the intervals of the cement particles, This is to delay the flow characteristics of concrete, which decreases with time, to improve workability, ie, fluidity.
그런데 이러한 작업성능개선제만이 포함된 혼화제의 사용량을 늘리면 유동성이 증가하지만 콘크리트의 단위결합재량이 360kg/m3이하인 경우 즉 저분체 콘크리트의 경우 일정 혼화제 사용량을 초과하여 사용하면 콘크리트의 페이스트와 골재가 분리되는 현상이 발생한다. 재료분리 발생하면 콘크리트의 강도를 형성할 수 없으며, 구조물에 콘크리트 타설시 성형이 불가능한 문제가 있다.However, when the amount of the admixture containing only the performance improving agent is increased, the fluidity is increased. However, when the unit bonding amount of the concrete is less than 360 kg / m 3 , that is, in the case of the low powder concrete, Separation phenomenon occurs. Separation of material can not form the strength of concrete, and there is a problem that molding is not possible when concrete is placed in the structure.
이에 본 발명에서는 고유동성혼화제를 구성함에 있어 작업성능개선제에 재료분리저감제가 더 첨가되도록 하여 고유동성이 확보되면서도 재료분리에 대한 저항성을 향상시키도록 하는 것이다.Accordingly, in the present invention, the constituent of the high-performance admixture is further added with a material-separating reducing agent to improve the work performance improving agent, thereby improving the resistance to material separation while ensuring high fluidity.
여기서 재료분리저감제의 경우도 다양한 공지재질이 적용될 수 있으며, 예로 아크릴계, 셀룰로오스계, 폴리사크라이드계 등이 사용될 수 있다.In the case of the material separation reducing agent, various known materials may be used. For example, an acrylic type, a cellulose type, a polysaccharide type and the like can be used.
또한 고유동성혼화제는 전체 중량대비 0.1 내지 0.15중량부로 포함되는 것이 타당한 바, 0.1중량부미만인 경우에는 고유동성의 발현이 미미하고 0.15중량부를 초과하는 경우 고유동성 및 재료분리 향상효과가 미미하여 상기와 같이 한정하는 것이다.In the case where the amount of the high-dielectric-constant admixture is in the range of 0.1 to 0.15 parts by weight, it is preferable that the amount of the high-dielectric admixture is in the range of 0.1 to 0.15 parts by weight. When the amount is less than 0.1 parts by weight, It is limited.
상기에서 본 바와 같이 본 발명의 조성물에 상기에서 언급한 혼화제 조성물을 첨가하면 고유동성이 확보되면서 재료분리에 대한 저항성이 향상되는 것을 알 수 있었다. 그런데 자기충전 콘크리트의 경우 재료분리 없이 고유동성이 발현되어야 하는데 상기 혼화제에 상기 작업성능개선제를 더 배합하는 경우 유동성은 향상되나 강도저하 등의 문제를 유발할 수 있다. 또한 고유동성 확보에 따른 수축균열의 문제가 유발될 수 있으므로 본 발명에서는 이러한 문제점을 해결하기 위한 첨가제를 제시하고 있다. As described above, it was found that the addition of the admixture composition to the composition of the present invention improves the resistance to material separation while ensuring high fluidity. However, in the case of self-compacting concrete, high fluidity is required to be exhibited without separating the material. When the performance improver is added to the admixture, the fluidity is improved but the strength may be lowered. In addition, since the problem of shrinkage cracking due to securing high fluidity may be caused, the present invention proposes an additive for solving such a problem.
본 실시 예의 첨가제에는 보습제 10 내지 20중량부, 하이드록시에틸섬유소 10 내지 30중량부, 벤잘코늄염화물 1 내지 3중량부가 포함되는 것을 특징으로 한다.The additive of the present embodiment is characterized by containing 10 to 20 parts by weight of a moisturizer, 10 to 30 parts by weight of hydroxyethyl cellulose, and 1 to 3 parts by weight of benzalkonium chloride.
보습제가 첨가되도록 함에 따라 작업성능개선제의 첨가량을 상기와 같이 한정하더라도 작업성을 배가시킬 수 있게 되는 것이며, 수축균열의 문제를 해결하게 되는 것이다.By adding the moisturizing agent, workability can be doubled even when the addition amount of the work performance improving agent is limited as described above, thereby solving the problem of shrinkage cracking.
상기 보습제는 공지의 재질을 사용하는데 예로 글리세린이 첨가될 수 있다. The moisturizing agent is a known material, for example, glycerin may be added.
상기 하이드록시에틸섬유소는 수용성 고분자로서 첨가되는 것으로 수성 성분의 폴리머 에멀젼을 통해 피막기능을 부여하게 되는 것이다. 즉 물에 상기 하이드록시에틸섬유소가 분산된 상태에서 도포 등이 되어 수분증발에 따라 폴리머 필름을 형성시킴으로써 시멘트 입자 표면으로부터의 수분 증발을 억제시킨다.The hydroxyethyl cellulose is added as a water-soluble polymer and imparts a coating function through a polymer emulsion of an aqueous component. That is, the hydroxyethyl cellulose is dispersed in water to form a polymer film upon evaporation of water by coating or the like, thereby suppressing moisture evaporation from the surface of the cement particles.
즉 이러한 하이드록시에틸섬유소에 의해 수분증발을 방지함으로써 모세관현상에 의한 균열 등을 제어하게 되는 것이다. 또한 수분증발에 의한 유동성 저하의 문제도 해결토록 하는 것이다.That is, by preventing the evaporation of moisture by the hydroxyethyl cellulose, it is possible to control cracks due to the capillary phenomenon. Also, the problem of lowering the fluidity due to evaporation of water is also solved.
그런데 균열제어 등을 위해 하이드록시에틸섬유소를 다량으로 첨가하는 경우 하이드록시에틸섬유소 간 뭉침이 발생되는 문제가 있을 수 있다. 또한 자기충전 콘크리트의 경우 피충전물에 잔존하는 유기물 등에 의해 부식 등이 발생될 수 있는 문제가 있을 수 있다.However, when a large amount of hydroxyethyl cellulose is added for crack control, there may be a problem that hydroxyethyl cellulose is clumped. Also, in the case of self-filled concrete, corrosion may occur due to organic matter remaining in the filling material.
이에 본 실시 예에서는 벤잘코늄염화물이 첨가되도록 하는데 벤잘코늄염화물은 상기 보습제의 증발을 방지하여 보습제 기능의 유지성을 높이도록 하는 것이다. 즉 하이드록시에틸섬유소를 상기와 같이 한정된 범위로 첨가하여 균열저항성을 향상시키면서 보습제 기능의 유지성을 높여 수축균열 저항성을 향상시키도록 하는 것이다. 당연히 보습제 기능의 유지성을 통해 작업성의 유지성도 향상되는 것이다.Thus, in this embodiment, benzalkonium chloride is added, and benzalkonium chloride prevents evaporation of the humectant, thereby enhancing the maintenance of humectant function. That is, the hydroxyethyl cellulose is added in a limited range as described above to improve the crack resistance, while enhancing the retention of the function of the moisturizing agent, thereby improving shrinkage crack resistance. Naturally, the maintenance of the workability is improved through the maintenance of the function of the moisturizing agent.
또한 벤잘코늄염화물은 암모늄 분자의 양이온으로 부착되어 있다가 세균이 존재하는 경우 세균 표면의 음이온 부위를 전기적으로 흡착하여 그 표층을 물리화학적으로 파괴함으로써 세균증식을 억제한다. 즉 피충전물에 유기물 등의 존재에 따른 세균을 제어하여 부식을 방지토록 하는 것이다.In addition, benzalkonium chloride is attached to the cation of ammonium molecule. When bacteria are present, it electrically adsorbs the anion part of the surface of bacteria and physically and chemically destroys the surface layer to inhibit bacterial growth. That is, the bacteria to be controlled by the presence of organic substances or the like in the filling material is controlled to prevent corrosion.
이하에서 실험예를 통해 본 발명을 설명한다.Hereinafter, the present invention will be described with reference to experimental examples.
본 실험에서는 하기 표 1에서 보는 바와 같이 시료를 배합하였으며, 배합 1은 혼화제에 작업성능개선제만이 첨가된 시료이며, 배합 2는 혼화제에 작업성능개선제 및 재료분리저감제가 첨가된 시료이며, 배합 3은 혼화제에 작업성능개선제, 재료분리저감제 및 첨가제가 첨가된 시료이다.In this experiment, as shown in Table 1, a sample was mixed. In the mixture 1, only the performance improving agent was added to the admixture. In the
도 1에서 보는 바와 같이 혼화제의 첨가량을 높일수록 유동성면에서는 배합 1 내지 3이 모두 좋아지는 것을 알 수 있으나, 배합 1의 경우 표 1에서 보는 바와 같이 재료분리가 발생되는 것을 알 수 있다.As shown in FIG. 1, it can be seen that as the addition amount of the admixture is increased, the formulations 1 to 3 are improved in terms of fluidity, but in the case of Formulation 1, material separation occurs as shown in Table 1.
또한 배합 2 및 배합 3을 비교하면 배합 3의 경우가 유동성면에서 더욱 유리한 효과가 나타나는 것을 알 수 있다. 이는 상기에서 본 바와 같이 첨가제에 보습제, 하이드록시에틸섬유소 및 벤잘코늄염화물이 포함됨에 기인한 것으로 판단된다. Further, when the
그 다음으로 배합 3을 가지고 혼화제의 첨가량에 따른 FLOW시험, V-lot시험, U-box시험을 실시 하였는다. Then, FLOW, V-lot and U-box tests were carried out according to the amount of admixture added.
그 결과가 도 2 내지 도 4에 도시되고 있는 바, 도 2 내지 도 4에서 보는 바와 같이 혼화제의 첨가량이 전체 중량대비 0.1 내지 0.15중량%가 첨가되는 경우가 콘크리트의 Flow가 500~600mm이고, V-lot시험에서 7~15초, U-box시험에서 단차가 10cm이내인 자기충전 콘크리트 성능을 갖는 것으로 판단되며 0.15중량%를 초과하는 경우는 그 성능향상이 미미한 것을 알 수 있다.2 to 4, when the addition amount of the admixture is 0.1 to 0.15 wt% based on the total weight, the flow of the concrete is 500 to 600 mm, the V -lot test for 7 to 15 seconds, and the U-box test has a self-filled concrete performance of less than 10 cm in step. If it exceeds 0.15% by weight, the performance improvement is insignificant.
이상 설명한 내용을 통해 당업자라면 본 발명의 기술사상을 일탈하지 아니하는 범위에서 다양한 변경 및 수정이 가능함을 알 수 있을 것이다. 따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허 청구의 범위에 의해 정하여 져야만 할 것이다.It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.
Claims (3)
2 to 10 parts by weight of the material separation reduction with respect to 100 parts by weight of the work performance improving agent, and 80 to 150 parts by weight of the additive.
고유동성혼화제는 전체 중량대비 0.1 내지 0.15중량부로 포함되는 것을 특징으로 하는 고유동성혼화제가 포함된 자기충전 콘크리트 조성물.
The method according to claim 1,
Wherein the high-permittivity admixture is contained in an amount of 0.1 to 0.15 part by weight based on the total weight of the composition.
상기 첨가제에는 보습제 10 내지 20중량부, 하이드록시에틸섬유소 10 내지 30중량부, 벤잘코늄염화물 1 내지 3중량부가 포함되는 것을 특징으로 하는 고유동성혼화제가 포함된 자기충전 콘크리트 조성물.The method according to claim 1,
Wherein the additive comprises 10 to 20 parts by weight of a humectant, 10 to 30 parts by weight of hydroxyethyl cellulose, and 1 to 3 parts by weight of benzalkonium chloride.
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| KR20010089977A (en) * | 2000-04-07 | 2001-10-17 | 심명수 | Inorganic compositions for the protection of concrete material |
| KR100875899B1 (en) * | 2007-08-17 | 2008-12-26 | 주식회사 웸 | Inorganic-based hydraulic composition and construction process of floor using the same |
| KR100888534B1 (en) | 2007-08-08 | 2009-03-11 | 한국전력공사 | Cement composition and method of manufacturing high flow concrete |
| KR101644846B1 (en) * | 2016-01-18 | 2016-08-02 | 최현욱 | Cement mortar composition for protecting surface of concrete structure and method for protecting surface of concrete structure therewith |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20010089977A (en) * | 2000-04-07 | 2001-10-17 | 심명수 | Inorganic compositions for the protection of concrete material |
| KR100888534B1 (en) | 2007-08-08 | 2009-03-11 | 한국전력공사 | Cement composition and method of manufacturing high flow concrete |
| KR100875899B1 (en) * | 2007-08-17 | 2008-12-26 | 주식회사 웸 | Inorganic-based hydraulic composition and construction process of floor using the same |
| KR101644846B1 (en) * | 2016-01-18 | 2016-08-02 | 최현욱 | Cement mortar composition for protecting surface of concrete structure and method for protecting surface of concrete structure therewith |
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