• 한국건설순환자원학회논문집
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• 제8권1호
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• pp.1-10
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• 2013

본 연구에서는 OPC 및 BFS 혼입 콘크리트의 초기재령 압축강도 향상을 위해 산업부산물인 티탄석고, 정수오니를 활용하여 경제성을 만족하면서 콘크리트의 조기강도(재령 1, 3일)를 향상시킬 수 있는 촉진제(이하 HSB) 개발을 위한 기초적 연구를 실시하였다. 조강형 분체의 제조를 위한 산업부산물의 조합 비율은 기초 실험 및 성분분석을 통해 티탄석고(4) : 석회석(3) : 정수오니(3)의 비율로 조합을 확정하였으며, HSB의 혼입률은 사전시험을 거쳐(7~9) %가 적정한 것으로 나타났다. 페이스트 경화체의 SEM 촬영 결과 HSB 혼입을 통한 자극으로 인해 수화반응이 촉진되어 수화생성물이 다량 분포한 것을 SEM 측정을 통해 확인 할 수 있었으며, HSB 혼입 콘크리트 압축강도 측정결과 HSB를 혼입함에 따라 Plain 배합에 비해 초기재령에서 높은 압축강도 발현율을 나타내는 것을 확인할 수 있었다. 또한 GHSB에 비해 FHSB 배합이 더욱 우수한 강도를 나타내었으며, FHSB 치환율이 증가함에 따라 압축강도는 소폭 상승하는 결과를 나타내었다. 한편, HSB 및 혼합시멘트를 사용한 콘크리트의 경우 촉진재 종류에 관계없이 촉진재 치환율 9 %에서 Plain 배합 이상의 조기강도를 발현하는 것으로 나타났으며, 촉진재 종류에 따른 영향을 알아본 결과, GHSB에 비해 FHSB가 재령 1, 3일에는 더욱 우수한 조기강도 발현성능을 나타내었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.152-153
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• 2016

In this research, we evaluate the performance for preventing frost damage at early age of mortar using variable cement and self-heating binder. Purpose of final research is preventing freezing and thawing by making the compressive strength 5MPa in 3days below zero temperature without heat curing. We compare the compressive strength of mortar and concrete using variable cements and self-heating binder in low temperature.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.769-774
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• 2002

In this study, methyl methacrylate (MMA)- modified polyester polymer concrete, in which the MMA was added to the unsaturated polyester resin, was developed for improving the early-age strength and the workability of the conventional polymer concrete, binder of which was the unsaturated polyester resin. Then the fundamental properties of the polymer concrete such as workability and strength were surveyed. The experimental results showed that the workability was remarkably improved as the MMA contents increased, and the filler-binder ratio was turned out to be important factor for the workability. Slump prediction equation was derived by the regression analysis based on MMA content and filler-binder ratio. Furthermore, early-age strength was greater when the MMA content were increased in the range of 20-40 % but the strength rather showed a tendency of decrease when the MMA content was 50 %.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 추계 학술논문 발표대회
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• pp.57-60
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• 2007

This study is to discuss the effect of the liquid type high early strength agent considering early strength, developing strength, and economics of the concrete using admixtures. The powder type high early strength agent does not helpful because the field application is not available such as the problem of mixing process and rack of economics. To make up these subjects, the plain mixture contains the standard type AE water reducing agent, and the types of the agents are the standard type AE water reducing agent(P),liquid type high early strength agent(AD),poly carboxylate high early strength type AE water reducing agent(E1), and naphthalene + melamine high early strength type AE water reducing agent(E2). As the Contents of the agents, E1 and E2 is two types each cases, and P is one type to satisfy the target fluidity and air content, AD is three types as 0.5, 1.0,and 1.5%. In the case that AD is mixed, the fluidity is decreased, but air content is increased. For increasing strength of the early age, using OPC is more effective than FA and BS for increasing the early strength of the concrete, and if the air content is secure as plain, the effect of the developing strength can be increased because the air content is increased about 2% in the case that AD is used.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.48-49
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• 2013

This test investigates early strength and durability of concrete using early strength type materials(cement, Polycarboxylate acid). The goal of this test is to secure the strength of 5.0 MPa in 12 hours early age and strength of 14 MPa for 24 hours correspondingly. This type of admixtures, concrete curing temperature, amount of binder and other concrete properties were confirmed by experimental factors. Comparing outcomes from two cases on using early strength type materials and common materials resulted in reducing of costs and shortening of the construction period, that determined the economical benefits of using early strength materials in construction.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 추계 학술논문 발표대회
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• pp.144-145
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• 2016

In this study, the research to be utilized as a binder to increase the early strength of concrete polysilicon sludge is a byproduct industries. In this paper, there is a purpose to confirm the initial strength performance of polysilicon sludge.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.123-127
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• 2005

EVA Powder modified high strength concretes were prepared by varying polymer/binder mass ratio with a constant water/binder mass ratio of 0.3. The effect of EVA powder on the slump, hydration heat, compressive and flexural strength, toughness and water absorption ratio was studied. In hydration heat test, temperature of hydration reaction displayed almost fixed level regardless of containing rate of EVA powder, but peak time of hydration reaction displayed late inclination as containing rate of powder increases. With the same water/binder mass ratio, the compressive strength and water absorption of EVA powder modified concretes decreased slightly when EVA powder was added and the flexural strength of EVA powder modified concretes rised slightly when EVA powder was added. Also, the toughness of the modified concretes can be improved markedly. The interpenetrating structure between the polymeric phase and cement hydrates formed at a $2{\sim}6%$(containing rate of EVA powder). The properties of the polymer modified concretes were influenced by the polymer film, cement hydrates and the combined structure between the organic and inorganic phases.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.599-602
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• 2005

In this research, the characteristics of the strength development and chloride attack resistance on the concrete using high early strength cement by steam curing temperature condition were studied. As a result, It is observed that the early strength(16hr) is increasing and the strength of 28 days is decreasing, according as the rising of the steam curing temperature without the kinds of base cement(OPC and high early strength cement). On the other hand, it is observed that the more the contents of the unit binder(base cement + GGBF) is abundant, the more the steam curing temperature can be reduced in case of the high early strength. Also, the chloride attack resistance is improved according as the amount of GGBF is increased with the kinds of base cement(OPC and high early strength cement).

• 한국결정성장학회지
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• 제24권1호
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• pp.27-32
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• 2014

본 연구에서는 매스콘크리트의 수화열 저감 및 초기강도 향상을 목적으로 3성분계 배합에 따른 콘크리트의 기초적 특성을 분석하였는데 결과를 요약하면 다음과 같다. 굳지 않은 콘크리트의 물성은 목표범위를 모두 만족하는 것으로 나타났다. 응결시간은 W/B와 관계없이 저열 시멘트 배합이 가장 빠른 것으로 나타났고, 간이 수화열은 저열 배합의 피크 온도가 가장 높은 것으로 나타났고, 저발열-B 배합이 가장 낮은 온도를 나타내었으며, 조강형 저발열 배합은 저발열-B와 유사한 것으로 나타났다. 경화 콘크리트의 압축강도는 초기재령에서 저발열-B 배합을 제외한 모든 배합이 유사한 강도 범위를 나타내었고, 장기 재령에서는 큰 차이 없이 유사한 강도 범위를 나타내었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.19-22
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• 2003

This study is carried out (1) checking the development of compressive strength of high flowing concrete at early age, changing water-binder ratio, curing temperature, and type of aggregate, and (2) suggesting basic date that helping cost and schedule plan in future construction. As the result of this study, we find that high curing temperature is effective for the development of compressive strength of concrete at early age on the condition of each water-binder ratio, and after making the compressive prediction formula related to the curing temperature by maturity, the result of the formular is similar to the temperature-compressive strength-age measured data