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황인성,장덕우,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study is intended to develop AE water reducing agent for reduction of bleeding and investigate its practical use. According to the results, fluidity and air content increases with an increase of superplasticizer and MC viscosity agent, AE water reducing agent for reduction of bleeding is developed after determining the ratio of superplasticizer and MC viscosity agent as 3:1 to satisfy the same fluidity and air content to conventional concrete and reduce bleeding amount. As the adding ratio of developed AE water reducing agent for reduction of bleeding increases, fluidity also increases, air content satisfies the aimed range, bleeding and sinking amount of concrete are reduced, and compressive strength is almost not different from plain concrete. Therefore, developed AE water reducing agent for reduction of bleeding satisfies the aimed air content in the range of slump 12~21cm, and can also reduce bleeding amount effectively without quality deterioration of compressive strength.
트리에탄올아민의 혼입률 변화에 따른 콘크리트의 초기 강도발현 특성
황인성,金光華,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
In this study, the influence of TEA on early strength development of concrete is discussed in order to reduce a construction period in RC structure by early removal of forms. According to the results, as for the properties of fresh concrete, fluidity of concrete shows no difference, and air content increases with an increase of the mixing ratio of TEA. Setting time is shortened upto mixing ratio of 0.025%, but is retarded above the mixing ratio of 0.025%. The time when compressive strength gains 5MPa is fast in about 2 hours in the case of the mixing ratio of 0.05%, but it is retarded above the mixing ratio of 0.05%. The relativity between compressive strength and the rebound value of P-type Schmidt hammer is also favorable at early age, and compressive strength of 5MPa, which the side forms can be removed, is estimated at the rebound value of 23.
황인성,윤섭,백병훈,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The objective of present paper is to develop the gluconic based super retarding admixture(GSRA) to improve the quality of existing super retarding admixture(SRA) by mixing gluconic acid, MC based viscosity enhancing admixture(VEA) with specific ratio. For fresh concrete properties, the use of gluconic acid with 0.4% exhibited an increase in slump and bleeding and a decrease in air content compared with those with plain concrete. To control increased bleeding and decreased air content by gluconic acid, use of VEA with 0.04% make the bleeding and air content of concrete with gluconic acid maintained the level of plain concrete. For setting time, final set was observed at 4~4.5 days with the presence of gluconic acid. Setting time of concrete with gluconic acid was not affected by the use of VEA. For compressive strength, compressive strength of concrete with gluconic acid increased by about 15~20% at 28days after final set compared with plain concrete. And also. compressive strength of concrete with gluconic acid was not affected by the use of VEA. In the scope of the paper, proper combination of newly developed GSRA was fixed at 1:0.1(gluconic acid:MC based VEA) to both enhance the quality of existing SRA and fluidity increase.
황인성,文學龍,金光華,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(구조계)
This study is to investigate the influence of contents of mineral admixture on bleeding of concrete. According to the results, as W/B increases, bleeding occurs rapidly at early age regardless of replacement of mineral admixture, and when slump and air content are kept equal, the amount of bleeding decreases proportionately with an increase of replacing ratio of fly ash and blast furnace slag powder. Bleeding speed is highest at 60 minutes after placing concrete, and grow slower after 180 minutes. Bleeding speed also grows high with an increase of W/B, and is lower in the case of fly ash than in the case of blast furnace slag powder.
조기강도 발현형 AE감수제를 사용한 콘크리트의 특성에 관한 연구
황인성,김규동,이승훈,한천구 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study discusses the fundamental properties and early strength development of concrete using AE water reducing agent of early-strength type. According to the result, when AE water reducing agent of early-strength type is used, slump and air content loss is smaller than normal AE water reducing agent. While setting time is retarded with an increase of the adding amount of normal AE water reducing agent, it is maintained constantly regardless of the adding amount and faster than normal AE water reducing agent in the case of AE water reducing agent of early-strength type, and bleeding amount is larger than normal AE water reducing agent especially at early age. At curing temperature of 20℃, early compressive strength gains 5MPa, which side form can be removed, before 16 hours in the case of AE water reducing agent of early-strength type, but early compressive strength development is delayed in the case of normal AE water reducing agent. At curing temperature of 10℃, AE water reducing agent of early-strength type is also better than normal AE water reducing agent especially for early compressive strength development.
글루콘산계 지연제의 종류 및 혼입률 변화에 따른 시멘트 모르터의 응결 및 강도특성
윤섭,황인성,백병훈,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper, fundamental engineering properties of cement mortar with gluconic based super retarding admixture(GSRA) type and content are discussed. For fresh mortar properties, flow of cement mortar exhibited an increase tendency with an increase in GSRA content. Remarkable flow loss was not observed at GSRA A with an elapse of age. For setting properties, presence of GSRA affected the setting time retarding. The effect of GSRA type on setting time retarding is in order for A, B, C. This is due to the gap of consistency. Compressive strength of cement mortar with GSRA is higher than that with plain mortar after 28days since final set.
팽창재 및 수축저감제 사용에 따른 고성능 콘크리트의 특성
문학룡,황인성,한천구 청주대학교 산업과학연구소 2004 産業科學硏究 Vol.21 No.2
This study is investigate the fundamental and shrinkage properties of high performance concrete of W/B 30% with using expansive additive and shrinkage reducing agent. According to the results, it is considered that fluidity and air content are hardly influenced and strength development well by using expansive additive and shrinkage reducing agent. As for the shrinkage properties, it shows the best efficient to reduce autogenous and drying shrinkage when combined use of expansive additive and shrinkage reducing agent which have different shrinkage reducing concept. There for, combined use of expansive additive and shrinkage reducing agent is efficient to reduce shrinkage in high performance concrete of W/B 30%.
배정렬,김은호,황인성,한천구 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
This paper is a fundamental study on the influence on the properties of high peformance concrete by mineral admixture. According to the results, while the fluidity decreases with the increase of replacement ratio of silica fume, it increases with the increase of replacement ratio of the other mineral admixture. Air content shows decreasing tendency with the increase of replacement ratio of fly ash, and the compressive strength of FA-SF2 shows the highest score. And the drying shrinkage increases with the increase of replacement ratio of fly ash, but it does not show much difference with the increase of replacement ratio of blast furnace slag powder. The autogenous shrinkage increases with the increase of replacement ratio of blast furnace slag powder, silica fume, while it decrease with the increase of replacement ratio of fly ash or combination of fly ash and silica fume. Therefore, it is thought that the fluidity, the placeability and the strength will be improved and the crack caused by autogenous shrinkage will be reduced by use of fly ash and silica fume together when making the high performance concrete.
운반시간 지연에 의해 저하된 레미콘의 성능회복에 관한 기초적 연구
전충근,文學龍,황인성,양성환,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
In this paper, availability of deteriorated remicon due to delaying delivery time is discussed. According to test results, fluidity and air content of plain concrete exhibited a tendency to decline with a elapse of time. After 90 minutes since mixed, use of superplasticizer and AE admixture resulted in an increase in fluidity and air content. Adequate dosage of superplasticizer and AE adimixture is found to add with 0.4% and 0.002% respectively to restore the level of original slump and air content from loss one. Setting time of concrete exhibited an acceleration with an increase in leaving time of concrete. Compressive strength of plain concrete is enhanced with and increase of leaving time of concrete. Therefore, it is found that the use of superplasticizer with 0.4% and AE admixture with 0.002% has a desirable effect on restoring the deteriorated quality of concrete related to fluidity, air content and setting time without strength loss caused by delivery time delaying.