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경제성을 고려한 80MPa급 초고강도 콘크리트의 결합재 조합에 대한 검토
박천진,고경택,류금성,안기홍,안상구,Park, Chun-Jin,Koh, Kyung-Teak,Ryu, Gum-Sung,Ahn, Gi-Hong,Ahn, Sang-Ku 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.1
초고강도 콘크리트의 혼화재로는 일반적으로 실리카퓸(SF)을 사용한다. 실리카퓸은 강도, 내구성 측면에서 유리하나 제조원가를 상승시키는 원인이 된다. 따라서 본 연구에서는 80MPa급 초고강도 콘크리트의 제조원가를 낮추기 위하여 실리카퓸 대신에 고로슬래그(BS)와 플라이애시(FA)에 대해 검토하였다. 실험은 모르타르 배합으로 결합재 조합, 물-결합재비 및 단위결합재량에 대해 검토하였고, 그 결과를 토대로 콘크리트 배합설계를 통하여 물성에 대하여 검증하였다. 그 결과 압축강도 80MPa를 달성하기 위한 결합재는 OPC 60% BS 30%, FA10%로 구성하고, 물-결합재비는 21%, 단위 결합재량은 $720kg/m^3$이 적절한 것으로 분석되었다. 상기 도출된 결합재 조합, W/B 및 단위 결합재량을 반영한 콘크리트 배합에서 슬럼프 플로우는 715mm, 28일 압축강도는 97MPa로 양호하게 나타났다. 본 연구에서 도출한 결합재 조합을 사용하는 경우 실리카퓸을 사용한 결합재에 비하여 동등한 성능을 발휘하면서 약 50%의 결합재 비용을 절감할 수 있는 것으로 분석되었다. Silica fume is generally adopted as admixture for Ultra High Strength Concrete (UHSC) owing to its remarkable contribution to the strength and durability but increases significantly the fabrication cost of UHSC. Accordingly, this study investigates the replacement of silica fume by blast furnace slag (BS) and fly ash (FA) in order to lower the fabrication cost of 80MPa-UHSC. To that goal, experiment is conducted on the mix proportions of mortar in terms of its binder combination, water-to-binder ratio (W/B) and unit binder content. Based on the experimental data, a mix design of concrete is derived and its properties are verified. The results reveal that a W/B of 21% and unit binder content of $720kg/m^3$ are appropriate to achieve 80MPa-UHSC using a binder composed of 60% of OPC, 30% of BS and 10% of FA. The properties of the corresponding UHSC are seen to be satisfactory with a slump flow of 715mm and compressive strength of 97MPa at 28days. The application of the binder combination derived in this study is analyzed to reduce the cost by 50% of binder compared to the mix using silica fume while realizing equivalent performance.
실리카퓸 종류가 초고성능 콘크리트의 공학적 특성에 미치는 영향
박천진,고경택,안기홍,한민철,Park, Chun-Jin,Koh, Kyung-Teak,Ahn, Gi-Hong,Han, Min-Cheol 한국건설순환자원학회 2015 한국건설순환자원학회 논문집 Vol.3 No.3
초고성능 콘크리트(UHPC)는 낮은 물-결합재비를 바탕으로 다량의 강섬유, 실리카퓸, 충전재 및 고성능 감수제를 사용한다. UHPC는 높은 역학적 성능을 가지는 대신 실리카퓸을 사용함에 따라 점성이 증가되며 고가의 재료를 다량으로 사용하기 때문에 제조비용이 일반 콘크리트에 비하여 고가이다. 따라서 본 연구에서는 180MPa급 UHPC의 점성 저하를 위하여 실리카퓸 대신 지르코늄 실리카퓸(Zr)을 사용한 UHPC의 고성능 감수제(SP)의 사용량 및 종류, 충전재 크기에 따른 공학적 특성을 분석하였다. 그 결과 W/B 20%, Zr 100% 사용, SP-L 사용량 2~3%, 강섬유 혼입율 1.5 vol.%이고 $4{\mu}m$의 충전재를 사용하는 Zr-UHPC의 경우 기존의 실리카퓸을 사용한 배합에 비하여 우수한 유동성을 발현하고 압축강도 180MPa이상 확보 하였다. 또한 기존 UHPC 대비 33%의 제조비용 절감이 가능한 것으로 분석되었다. Ultra high performance concrete (UHPC) uses large quantities of steel fiber, silica fume, filler and superplasticizer for a low water-to-binder ratio (W/B). Despite of exceptional mechanical performances, UHPC exhibits increased viscosity due to the adoption of silica fume and its fabrication cost is costlier than ordinary concrete because of the use of large quantities of expensive materials. Following, this study evaluates the mechanical properties of 180MPa-UHPC using zirconium silica fume (Zr) instead of silica fume with respect to the quantity and type of superplasticizer (SP) and the size of filler. The results reveal that the Zr-UHPC using W/B of 20%, 100% of Zr, amount of SP-L of 2 to 3% and $4{\mu}m$-filler with steel fiber in 1.5 vol.% can develop better fluidity than the traditional mix composition using silica fume and secure a compressive strength higher than 180 MPa. In addition, the proposed mix composition is shown to enable a reduction of the fabrication cost by 33% compared to traditional UHPC.
화재피해를 입은 고강도 콘크리트 기둥의 피복깊이에 따른 반발도 특성
박천진 ( Park Chun-jin ),인기호 ( In Gi-ho ),여인환 ( Yeo In-hwan ),민병렬 ( Min Byung-yeol ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The purpose of the study was to analyze the remaining repulsive force followed by the covering depth after testing fire resistance of structure with high-strength concrete. The results were as follows. In the event of fire resistance characteristics, polylon fiber mixing rate of 0.05% and 075% didn't cause burst and satisfied the scope of the maxim temperature and the average temperature prescribed by the Ministry of Land, Transport and maritime Affairs. In the event of repulsive characteristics of structure, the remaining repulsive force was increased as much as the covering depth was increased. Namely, the remaining repulsive force of structure was about 78% in the depth 40m in the event of the polylon fiber mixing rate of 0.05% and had a high repulsive rate of about 70% in the event of 0.075%. As the result of inducing relations between the covering depthof structure and the remaining repulsive rate in the regressive process, it had a high correlation coefficient. It was estimated that the covering thickness/depth with 100% repulsive force was about 6.73~7.74mm.
화재피해를 입은 고강도 콘크리트 기둥의 피복깊이에 따른 반발도 특성
박천진(Park, Chun-Jin),인기호(In, Gi-Ho),여인환(Yeo, In-Hwan),민병렬(Min, Byung-Yeol),한천구(Han, Cheon-Goo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The purpose of the study was to analyze the remaining repulsive force followed by the covering depth after testing fire resistance of structure with high-strength concrete. The results were as follows. In the event of fire resistance characteristics, polylon fiber mixing rate of 0.05% and 0.075% didn't cause burst and satisfied the scope of the maxim temperature and the average temperature prescribed by the Ministry of Land, Transport and maritime Affairs. In the event of repulsive characteristics of structure, the remaining repulsive force was increased as much as the covering depth was increased. Namely, the remaining repulsive force of structure was about 78% in the depth 40m in the event of the polylon fiber mixing rate of 0.05% and had a high repulsive rate of about 70% in the event of 0.075%. As the result of inducing relations between the covering depthof structure and the remaining repulsive rate in the regressive process, it had a high correlation coefficient. It was estimated that the covering thickness/depth with 100% repulsive force was about 6.73~7.74mm.
내화성 고강도 콘크리트 구조물의 화재 후 반발도 특성 비교
박천진(Park, Chun-Jin),황동규(Hwang, Dong-Gyu),한창평(Hann, Chang-Pyung),양성환(Yang, Seong-Hwan),한천구(Han, Cheon-Goo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
The purpose of the study was to analyze damage characteristics and the remaining repulsion after testing a fire of high-strength concrete structure supposing a real housing building. The results of the study were as follows. Scaling and spalling were logically taken place in a pillar not mixing polylon fiber with fireproofing characteristics. However, a pillar mixing polylon fiber had a good fireproofing performance. The internal average temperature history of the real structure approached the highest temperature (713℃on average) in about four minutes after c mbustion, and its duration time was very short as about 20 seconds. As the results of c minuing the standnud heating curve of KS 2257-1 with the internal average temperature history of the structure, the internal average temperature of the structure was beyond the standnud heating curve within enuly fs afminutes. In temperature history characteristics of an internal pillar of the structure, when polylon fiber was not mixed, repulsion on the average generally was lower about 10 than before the fire test and difference in the remaining internal force between the upper inut and the lower inut was about 5 on the average. On the other hand, when polylon fiber was mixed, average repulsion was lower about 4 than before the fire test and deviation between the upper part and the lower part was not large.