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전현규,김대회,이종찬,지석원,유택동,서치호,Jeon, Hyun-Kyu,Kim, Dae-Hoi,Lee, Jong-Chan,Ji, Suk-Won,Yoo, Taek-Dong,Seo, Chee-Ho 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.2
In this research, we used fly-ash and blast-furnace slag as substitute material of cement and fine aggregate, and we, through experiments, researched and analyzed the features of high-flowable concrete added high efficiency AE water reduction agent. The results are below. 1. Liquefaction generally presented high-slump flow value; on the other hand, partial segregation was observed in case of mixing proportion with 65 cm slump flow and above. This segregation was partially improved in accordance with mixing admixture. 2. Compressive strength according to mixing admixture and increasing mixing ratio of fly-ash were subject to be declined when it was initially cast-in, but its gap was improved when time was fully passed. 3. After mixing blast-furnace slag and fly-ash as substitute material, the result showed that the modulus of elasticity against freezing & melting was improved according to mixing blast-furnace slag and also increased in accordance with increasing pulverulent-body volume. 4. According to increasing the mixing volume of fly-ash, the durability factor was deteriorated because compressive strength became lower as well as air content was decreased when it was initially case-in. 5. The minimum air content to secure durability was 3.7%, for that reason, we had better secure admixture such as air entraining agent when cast-in high-flowable concrete.
전현규 ( Jeon Hyun-kyu ),임진규 ( Lim Jin-kyu ),서치호 ( Seo Chee-ho ) 한국구조물진단유지관리공학회 1999 한국구조물진단유지관리공학회 논문집 Vol.3 No.3
In this study, study about fly ash and blast-furnace slag used as substitutive materials for cement, and the influence on the neutralization of high flow concrete durability with these substitutive materials was performed and analyzed. The results are as follows 1) Aggregate segregation was partially improved with the progress of the admixture input at the mix proportion above slump flow 65 cm 2) Compressive strength with the progress of the increasement of fly ash input was decreased in early age, but decrease range was improved in long term age. Also, in case of blast-furnace, similar or improved compressive strength was appeared. 3) The neutralization depth with fly ash input was noticeably increased. But blast-furnace slag was effective to prevent. 4) In this experiment, high powder content was advantageously affected on preventive effect of the neutralization, and the relationship between the compressive strength and the neutralization depth was inversely proportional.
팽창펄라이트를 사용한 콘크리트의 특성에 관한 실험적 연구
전현규(Jeon Hyun-kyu),서치호(Seo Chee-Ho),김대희(Kim Dae-hoi) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.5
Improve thermal insulated in structure of building and examination of development existing material of material that can improve performance of structure is required. There is expanded perlite that is having special quality suitable material to be used for composition material of building in various characteristic such as lightweight, incombustible, thermal insulation, sound absorption in this research. But, is used circumscriptively. Therefore, was going to apply to concrete and estimate the performance. Hereafter, I wished to recognize about practical use of expanded perlite as insulating lightweight concrete aggregate. Result that execute a concrete experiment that use in fine aggregate is as following. 1. According as the mixing rate increases 15% as result that average 2.25㎝ of slump value decreased. Air content was expose that 0.3∼0.4% increases. 2. Unit weight decreased by unit of average 23㎏/㎥ and 10㎏/㎥ according as increase by mixing rate 15% of expanded perlite. Improvement effect that is high more than wet condition that test piece gets into dry is expected. 3. Concrete compressive strength that use expanded perlite in fine aggregate expressed Compressive Strength of 248∼259kgf/㎠ in mixing design 210kgf/cm2. 240kgf/㎠'s mixing design expressed Compressive Strength of 290∼316kgf/㎠. Expressed higher value than 235kgf/㎠ and 279kgf/㎠ of standard mixing design. 4. Expanded perlite mixing rate rises, concrete compressive strength and tensile strength were fallen. Therefore, Choice of correct suitable mixing design to need in practical use usage. 5. Thermal conductivity is decrease average 0.059∼0.067㎉/mh℃ according as increase by mixing rate 15% of expanded perlite.
유동화제 첨가시기에 따른 콘크리트의 특성에 관한 실험적 연구
권춘안,전현규,Kwon, Chun-Ahn,Jeon, Hyun-Kyu 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.1
In order to analyze liquidity change according to increasing the charge of superplasticizer, we inputted charges by dividing into six steps, 0% through 1.25%; at the same time, to observe liquidity change according to the change of charge-time, we carried out the experiment applying 30-minute intervals, i.e. at beginning of mixing, 30, 60 and 90 minutes. The results are below. 1) According to increasing the charge of superplasticizer, the liquidity of concrete was enhanced, however, when inputted 1.25%, a little segregation was occurred, which allowed us to make a conclusion that concrete performance would be deteriorated due to this segregation. 2) When we inputted 1.25% of superplsticizer, steady liquidity features were shown regardless of the charge-time of concrete, which allowed us to make a conclusion that this input would be the best for liquidity performance considering only liquidity features. 3) After analyzing the dynamical features of liquid concrete, the result showed that there was not significant effect on revelation of compressive strength. We concluded form this result that there was no influence on the stripping-time of a mold form. 4) When we charge superplasticizer in concrete more than 1%, we, in advance, should clearly judge the concrete performance required during constructing in site, as it were, the compressive strength or liquidity etc.; furthermore, we had better decide a charge and input-time of superplasticizer to meet the required performance.