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가열건조법에 의한 단위수량 추정에 미치는 혼화재료의 영향
문학룡 ( Wen¸ Xue-long ),김영득 ( Kim¸ Young Deuk ),황인성 ( Hwang¸ Yin-seong ),한천구 ( Han¸ Cheon-goo ),김광서 ( Kim¸ Kwang Soe ) 한국구조물진단유지관리공학회 2002 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.6 No.2
This study is intended to investigate the influence of admixture factor on estimation of water content in fresh concrete. According to the results, as the replacing ratio of blast furnace slag powder and fly ash increases, the difference between designed and estimated water content by heat drying method grows small before correction, but water content is estimated favorably in the range of ± 5kg/m<sup>3</sup>, compared with designed water content after correction. Estimated water content shows the difference of 20~30kg/m<sup>3</sup> with increase of AE agent in comparison with designed water content before correction, but it is similar to designed water. As the mixing ratio of AE agent increases, water content is estimated less than designed water content with increase of air content.
팽창재 혼입률 변화에 따른 고성능 콘크리트의 수축저감에 관한 연구
김호림(Jin Hu-Lin),문학룡(Wen Xue-Long),고경택(Koh Kyoung-Taek),김성욱(Kim Sung-Wook),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
This study discusses the use of expansive additive as the method to reduce autogenous and drying shrinkage. According to results, as for the fundamental properties of high performance concrete, when shrinkage reduction agent is not used, fluidity and strength do not make a difference with the adding ratio of expansive additive. On the other hand, when shrinkage reduction agent is added by 1%, fluidity decreases, and air content increases with an increase of the adding ratio of expansive additive. Compressive strength is highest at the adding ratio of expansive additive of 5%. Autogenous and drying shrinkage are reduced with an increase of the adding ratio of expansive additive, and are reduced more largely in the case of combination with shrinkage reduction agent. Therefore, as expansive additive of 5% and shrinkage reduction agent of 1% are added to high performance concrete of W/B 30%, it is considered that fluidity and strength are hardly influenced, and in addition, crack by shrinkage can be prevented effectively.
회수수에 처리되는 당류계 안정화제의 혼입률 변화가 콘크리트의 품질에 미치는 영향
文學龍,金虎林,우종완,한민철,한천구 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
The objective of present paper is to investigate the engineering properties of concrete using recycling water incorporating saccharic based stabilizing agent in order to improve qualities of concrete in the region of normal strength and high strength. According to test results, fluidity and air content do not exhibit significant difference with an increase in stabilizing agent contents. Bleeding was not observed at 30% of W Ie, regardless of stabilizing agent contents, nonetheless, concrete with stabilizing agent of 0.15% was observed to occur the least bleeding at 40 and 50% of W IC. For setting time, although presence of recycled water accelerates setting time, setting time shows to be retarded gradually with an increase in stabilizing agent content. For compressive strength, use of stabilizing agent enhanced compressive strength of concrete compared with that of concrete without stabilizing agent. In the side of strength enhancement, adequate dosage of stabilizing agent is found to be 0.15%. As dosage of stabilizing agent increased above 0.15%, drying shrinkage exhibited a tendency to decrease.
문학룡,배정렬,한천구 청주대학교 산업과학연구소 2003 産業科學硏究 Vol.21 No.1
This study discusses the influence of fineness of cement on the properties of cement mortar. According to the results, compressive strength shows a higher value in order of high early cement with 8000㎠/g of fineness(C), 4600㎠/g of fineness(B), 3000㎠/g of fineness(A) and ordinary cement(OPC) at mixture proportion of 1:3, and it does in order of C, B, OPC and A at mixture proportion of 1:1. Compressive strength shows a higher value in order of exposure at outside, standard and air curing with variation of curing condition. Flexural strength shows the similar tendency with compressive strength, and is about 1/7∼1/6 in comparison with compressive strength. And, its correlativity is above 0.93, so it is very favorable. Length change by drying shrinkage is higher in order of C, B, OPC and A at mixture proportion of 1:1 and 1:3.
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%.
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.