• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.199-200
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• 2010

본 논문은 석회석 미분말을 활용한 고유동 콘크리트의 염소이온 확산계수를 통하여 확산계수를 추정 하였다. 또한 석회석 미분말의 혼합률에 따른 미세공극을 수은압입법에 의해 알아보았다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 봄 학술논문 발표대회
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• pp.72-73
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• 2021

For the development of high-fluidity concrete using low-binder, The effect of the use of the developed acrylic viscosity agent on the physical properties of concrete evaluated. The amount acrylic viscosity agent used was 1.5%, 1.7%, and 2.0% based on the binder amount of 400kg/m3, and slump flow test, slump flow 500mm arrival time measurement, air volume measurement, and U-Box passing test were conducted to determine the effect of the physical properties of concrete. it was judged that 1.5% of the acrylic viscosity agent used in high-fluidity concrete using low-binder was most suitable.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2021년도 가을 학술논문 발표대회
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• pp.129-130
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• 2021

For the development of high-fluidity concrete using low-binder, The effect of the use of the developed acrylic viscosity agent on the physical properties of concrete evaluated. The amount acrylic viscosity agent used was 0.28%, 0.29% and 0.30% based on the binder amount of 350kg/m³, and slump flow test, air volume measurement, U-Box passing test and strength compressive were conducted to determine the effect of the physical properties of concrete. it was judged that 0.29% of the cellulose type viscosity agent used in high-fluidity concrete using low-binder was most suitable.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문 발표회
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• pp.9-12
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• 2003

High flowing concrete has not spread whole in the normal concrete structure, because it requires special quality control technique. And recently owing to the lack of natural resources and reinforcement of environmental standard, the construction cost of cement is increased rapidly. Also rem icon industry has gone through various economical difficulty as the manufacture cost of concrete is increased. So, the purpose of this study is to evaluate the qualities of middle fluidity concrete using the fly-ash and portland blast-furnace slag cement in order to decrease the amount of cement and resolve the problem of the quality control of high flowing concrete and the manufacture cost. The results of this study show that it reduce the amount of addition of superplasticizer and develope properties of concrete to the use the fly-ash and portland blast-furnace slag cement.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1995년도 가을 학술발표회 논문집
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• pp.41-44
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• 1995

The purpose of this study is analyze to the properties of high fluidity concrete(W/C 35~50%) with the dosage of viscosity agent(Hydroxy Propyl Methyl Cellulose ; HPMC ; 15U), From the resuls, flowability was good about 200g/㎥. segregation-resisibility and placeability were good upward 300g/㎥, To synthetic, the dosage of viscosity agent are discovered best in 200~400g/㎥

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.801-804
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• 2006

Polycarboxylate type superplasticizers(PC) have got widely used for making not only high performance concrete but low grade concrete as well. It is known that fluidity of cement with PC is affected by the characteristics of cement especially sulphate ion concentration and hydration activity. But the characteristics of PC also affect the fluidity. The fluidity of cement mortar with various types of PC was measured and critical dosage(CD) and dispersing ability(DA) was calculated. CD and DA is strongly dependent on the type of PC. And the variation of fluidity on time was affected by the type of PC also. So, it is advisable to investigate the property of PC before production of concrete and adjust it to meet the requirements of concrete depending on the materials, the time of transport and so on.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 추계 학술논문 발표대회
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• pp.71-74
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• 2005

The viscosity of high-flowability paste is very high compared to normal concrete for the low water-binder ratio(W/B). Therefore, high-flowability concrete is positively necessary to high-range water reducing agent. High-Flowability paste can make much higher fluidity with no occurrence of segregation, by its higher viscosity and lower yield value than normal concrete. The flowability of high-flowability paste must be evaluated not only by convention consistency test such as slump test but also by the base of the rheological properties of the fresh concrete. The purpose of this study is to analyze the fluidity of high-flowability paste according to the addition ratio of the Melamine Sulphonate high-range water reducing agent.; high-flowability paste is considered as Bingham plastic fluid with the rheology parameters of the plaste viscosity and yield value.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1999년도 봄 학술발표회 논문집(I)
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• pp.89-94
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• 1999

The workability of high strength concrete using high range water reducing admixture is varied rapidly according to elapsed time. For using the high strength concrete in situ, careful caution on workability is necessary. By using fly ash as a admixture, the slump loss of concrete can be reduced considerably, but the early strength of concrete used fly ash is smaller than that not used fly ash. For the purpose of elevating the utilization of fly ash on high strength concrete, the high fluidity retention and the strength development in early age are necessary in concrete used fly ash. In this study, to improve the fluidity retention and to acquire strength development on concrete used fly ash, the gypsum is applied.

• 한국건축시공학회지
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• 제10권4호
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• pp.75-82
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• 2010

건설산업이 대형화, 초고층화, 다양화되면서 우수한 기술과 Know-how가 요구되고 있고, 또한 건설기술자의 부족, 특수환경 하에서의 건설공사의 증가 및 구조물의 고성능화 등의 요구에 따라 콘크리트 분야 기술력을 개발하고 실용화하는 것이 필요하다. 이를 위하여 고성능 콘크리트에 대한 성능규정 및 기술개발에 많은 노력을 기울여 왔으며 한 가지 방안으로 신뢰성이 높은 고유동 콘크리트를 적용하면 시공의 제약조건을 극복할 수 있으며, 작업인원의 절감 및 공기단축의 효과를 얻을 수 있을 것으로 기대된다. 고유동 콘크리트를 현장에 적용하기 위해서 실제 건설현장에서 대용량의 배치플랜트에서 생산할 경우에도 시공성을 만족시킬 수 있는지를 평가하기 위하여 현장 모의시험을 실시하였다. 시험결과로부터 다성분계 고유동 콘크리트는 실제 구조물에서도 양호한 충전성능을 가진 것을 확인할 수 있었고, 수화열로 인한 콘크리트 내부온도 상승도 양호한 범위 값을 나타내었다. 향후 시공조건에 따라 전련산업관련 구조물 등에 유용하게 활용될 수 있을 것이다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.385-386
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• 2010

본 논문은 석회석 미분말을 활용한 고유동 콘크리트의 유동 특성 및 자기수축량을 통하여 자기수축 특성을 알아보았다.