• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1992년도 봄 학술발표회 논문집
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• pp.19-22
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• 1992

Properties of concrete has effected on the dosage variation of AE superplasticizer agent, Therefore, this study is designed for analysis of concrete properies according to the dosage variation of AE superplasticizer agent , and is aimed to analyze the effect slump, air content, compressive strength, resistance of freezing-and-thawing and for presenting the reference data on the practical use.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 추계 학술논문 발표대회
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• pp.75-76
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• 2019

The purpose of this study is to achieving a sufficient fluidity without segregation for normal strength grade concrete mixture. therefore in this research, by analyzing the various superplasticizer dosages on the concrete mixture, the segregation range was analyzed to provide a proper concrete mix design with sufficient fluidity.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표논문집(II)
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• pp.297-300
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• 1998

Usually the flowing concrete manufactured upon normal-mixed base concrete would segregate due to the less of fine particle content. In the previous studies, a new type admixture(liquid segregation reducing type superplasticizer) has been developed to prevent such segregation without modification of base concrete mixture. In this study, the tests are performed in laboratory to evaluate the admixture by analyzing the properties of flowing concrete with different water to cement ratios, so that it could be used in the fields. According to the results, this kind of superplasticizer could improve the fluidity of concrete without causing segregation. However, it seems to be more desirable of the superplasticizer could be adjusted, before it is put into the practical use, not to cause some other problems such as rapid rate of slump and air loss and retarding of setting time.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.661-664
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• 2000

It is known that high flowing concrete performs much higher fluidity, segregation resistibility and better placeability than normal concrete. However, it is hard to apply high fluidity concrete in field because of high manufacturing cost. Therefore, we intend to investigate the validity of segregation reducing type superplasticizer which is made by combining 0.61 of viscosity agent and 0.022 of AE agent for 1 of superplasticizer. Test are conducted on high flowing concrete using fly ash by applying segregation reducing type superplasticizer. According to experimental results, As contents of fly ash increase, fluidity, segregation resistibility and placeability shows favorable results. And also compressive strength at early age shows to be retarded, while it gains high strength at later age.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.265-268
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• 2003

This study discusses the fundamental properties of high performance concrete and autogenous drying shrinkage with the kinds and the adding amount of superplasticizer. According to results, drying shrinkage hardly shows differences by the kinds of superplasticizer, and is reduced with an increase of the adding ratio. Autogenous shrinkage is reduced in order of HP>HN>HM, but does not make a big difference. As the adding amount of superplasticizer increases, autogenous shrinkage is reduced due to a decrease of cement content which influences on autogenous shrinkage seriously.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.671-674
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• 2005

In this study, it is examined the properties of early strength of concrete mixed with polycarboxylate superplasticizer. For this experiment, it is analyzed that the slump and strength properties according to the mixture factors, compared with cements and superplasticizers of each company and curing temperature($15,\;20^{\circ}C$). (1) The slump loss of concrete used polycarboxylate superplasticizer(rapid strength type) showed $0.5\~1.5cm$, it is judged that slump loss according to the time lapse can be minimized. (2) The performance of polycarboxylate superplasticizer kept up consistency and accelerated strength development. it is possible to reveal 12MPa within $18\~20$hours at $20^{\circ}C$ curing, but impossible within 24hours at $15^{\circ}C$. (3) It is necessary to studies about rapid strength development in the low temperature.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.501-504
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• 2005

This paper discusses the development of drying shrinkage reducing type superplasticizer(DSRS) by varying dosage of polycarboxylic based superplasticizer, liquid type expansive admixture and antifoaming agent. Adequate mixture proportion of each admixture is fixed at 0.3$\%$ of superplasticizer, 0.15$\%$ of liquidtype expansive admixture and 0.0005$\%$ of antifoaming agent to insure the improvement in drying shrinkage as well as comparable to the slump and air content of conventional concrete. With this mixture proportion, compressive strength of concrete using DSRS is comparable to that of conventional concrete. The use of DSRS studied by the authors has a favorable effect on reducing drying shrinkage due to the effect of water content and expansion by expansive admixture.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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• pp.55-56
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• 2011

This paper is to compare and analyze the properties of ultra high strength concrete depending on the use of SF aiming for applicability of superplasticizer containing CASB as a functional agent for strength improvement. As experimental results, in case superplasticizer containing CASB is used, regardless of W/B, settiing time was more accelerated than N, and both compressive strength and tensile strength showed an increase in their strength minutely.

• 공업화학
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• 제21권4호
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• pp.463-468
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• 2010

콘크리트 유동화제로 사용되는 polycarboxylate 계 콘크리트 유동화제를 합성하였다. 합성에 있어서 친수기인 polyethylene oxide 부가몰 및 분자량에 따른 합성된 유동화제의 물성 및 이의 콘크리트 몰타르에 미치는 영향을 조사하였다. 합성원료로서 methoxy-polyethyleneglycol 및 methacrylic acid의 종류, methacrylic acid 부가량, 개시제 종류 및 양에 따른 graft 공중합 조건에 따라 얻어진 PC의 물성 및 이가 모르타르에 미치는 영향을 조사하였다. 물성으로는 PC 수용액의 계면물성, 시멘트 입자의 젖음성, 몰타르의 유동성 및 최종 콘크리트의 강도 등을 측정하였다. 합성된 PC는 수용액에 대한 표면장력 값이 작을수록 시멘트 입자에 대한 젖음성이 우수할수록 우수한 모르타르 유동성을 보였으며 콘크리트의 강도가 높았다. 본 연구 조건에서는 MPEG 대비 MA 함량이 1.3 정도일 경우 그리고 개시제가 KSP일 경우에 합성된 PC가 가장 적합하였다.

• 자원리싸이클링
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• 제25권3호
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• pp.20-28
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• 2016

산업부산물을 사용한 친환경 초고성능 콘크리트(Ultra-high performance concrete, UHPC)의 시공성 확보를 위해 요구되는 초유동화제의 적정 혼입량을 검토하였다. UHPC에 적용한 산업부산물은 고로슬래그 미분말, 화력발전소 바텀애시, 급랭 슬래그였다. 일반적인 UHPC에 사용되던 기존 재료를 산업부산물로 부분 혹은 전량 치환한 배합에, 다양한 초유동화제 혼입량을 적용하였다. 부산물 사용에 의해 UHPC의 유동성이 개선되었으며, 이 때 초유동화제 혼입량을 감소시킨 경우에도 유동성 및 압축강도의 저하는 발견되지 않았다. 부산물 사용 및 초유동화제 혼입량 감소로 인해 UHPC의 재료 가격이 감소함을 확인하였다.