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레디믹스트콘크리트에 순환굵은골재를 치환한 R/C 보의 장기처짐에 관한 사용성 검토
윤승조,서수연,이우진,강성덕,김대영,민석환 대한건축학회지회연합회 2006 대한건축학회지회연합회 학술발표대회논문집 Vol.2 No.1
In accordance with the national trend, although research about deflection of reinforced concrete that use nature aggregate in domestic research had been studied, they have prescribed to use the recycled aggregate compulsorily in case of over construction scale as an applicable construction of "Law about contract that the nation should be a contracting party" since 2005. However, although it has still obligated to use the recycled aggregate based on "Recycled aggregate quality standard" by Construction and Transportation Ministry, actually its study on long-term deflection of recycled aggregate is an unsatisfied situation. Therefore, the purpose of this study is to resolve the technical problems for cycling concrete through its experiment and analysis of long-term deflection by the substitution rate of recycled aggregate.
순환골재 치환율에 따른 R/C보의 장기처짐에 관한 연구-Ⅱ
윤승조(Yoon Seung-Joe),서수연(Seo Soo-Yeon),이우진(Lee Woo-Jin),강성덕(Kang Seong-Duk),민석환(Min Suk-Hwan) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
In this paper, long term deflection of RC beam with variable replacement ratio of recycled aggregate[RA] is investigated. 6 RC beam specimens are designed using concrete made of coarse aggregate[CA] of 25㎜ size, mix strength of 21㎫, slump of 120㎜ and air content of 5.0±1.5%. A few concrete blocks are made and used for long term loading. The loading and deflection instrumentation are conducted following the process codified in ACI 318-05 code. Test result shows that the deflection of specimens with RA replacement ratio 10%, 20% is low compared with normal specimen with natural CA but the specimen with RA replacement ratio 30%, 40%, 50% is higher than the normal specimen.
순환굵은골재 치환율에 따른 콘크리트의 부착성능 평가에 관한 연구
윤승조 ( Yoon Seung-joe ),서수연 ( Seo Soo-yeon ),이우진 ( Lee Woo-jin ),강성덕 ( Kang Seong-duk ),민석환 ( Min Suk-hwan ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.1
This study investigated the effect of recycled coarse aggregate satisfied the MOCTs quality criterion on bonding stress in concrete. Main parameter considered included the substitution ratio of recycled aggregate, 0%, 10%, 20%, 30%, 40% and 50%. The test results indicated that the bonding stress of specimens used recycled aggregate by maximum 50% higher than plain concrete. From the test, when the substitution ratio of recycled coarse aggregate decreased about 10% in concrete compressive strength and bonding-stress, but the predicted bonding-stress by design code as ACI, CEB-FIP was conservative.
순환굵은골재 치환율에 따른 콘크리트의 부착성능 평가에 관한 연구
윤승조(Yoon Seung-Joe),서수연(Seo Soo-Yeon),이우진(Lee Woo-Jin),강성덕(Kang Seong-Duk),민석환(Min Suk-Hwan) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
This study investigated the effect of recycled coarse aggregate satisfied the MOCTs quality criterion on bonding stress in concrete. Main parameter considered included the substitution ratio of recycled aggregate, 0%, 10%, 20%, 30%, 40% and 50%. The test results indicated that the bonding stress of specimens used recycled aggregate by maximum 50% higher than plain concrete. From the test, when the substitution ratio of recycled coarse aggregate decreased about 10% in concrete compressive strength and bonding-stress, but the predicted bonding-stress by design code as ACI, CEB-FIP was conservative.