서울대학교 · Engineering
홍성국 교수의 연구실은 초고강도 콘크리트 및 첨단 세라믹 복합재료의 개발과 응용을 중심으로, 우수한 내구성과 기계적 성질을 갖춘 신소재 콘크리트 기반의 구조물 설계 및 성능 향상을 연구하고 있습니다. 특히 우수한 균열 저항성과 내구성을 확보하기 위해 섬유, 나노소재(예: 탄소나노튜브), 천연 점토 기반 보강재를 활용한 복합체 개발에 주력하고 있으며, 지속 가능한 건설자재의 실현을 목표로 하고 있습니다. 또한, 전기적 특성과 기계적 거동을 동시에 확보한 스마트 콘크리트 및 지진에 대한 내구성 향상 기술도 핵심 연구 분야입니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
One of the primary concerns about the design aspects is that how to deal with the shear reinforcement in the ultra-high performance fiber reinforced concrete (UHPFRC) beam. This study aims to investigate the shear behavior of UHPFRC rectangular cross sectional beams with fiber volume fraction of 1.5 % considering a spacing of shear reinforcement. Shear tests for simply supported UHPFRC beams were performed. Test results showed that the steel fibers substantially improved of the shear resistance
For optimum production of ultra-high performance concrete (UHPC), the material and microstructural properties of UHPC cured under various heat treatment (HT) conditions are studied. The effects of HT temperature and duration on the hydration reaction, microstructure, and mechanical properties of UHPC are investigated. Increasing HT temperature accelerates both cement hydration and pozzolanic reaction, but the latter is more significantly affected. This accelerated pozzolanic reaction in UHPC cle
The effects of incorporating carbon nanotubes (CNTs) into ultra-high performance concrete (UHPC), thereby forming UHPC/CNT composites, were investigated in terms of electrical curing efficiency, mechanical properties, and crack sensing capability. The addition of CNTs significantly decreased the electrical resistivity of the UHPC, allowing effective electrical curing at low voltage; improved mechanical properties through bridging, pore filling, and calcium-silicate-hydrate (C-S-H) stiffening eff
The objective of this study is to develop and characterize kaolinite clay-based structural mortar. The pozzolanic reaction induced from two mineral additives, i.e., calcium hydroxide and silica fume (SF), and the physical filling effect from SF, were found to be effective on the enhancement of structural properties. Based on several preliminary experiments, 7:3 ratio of kaolinite clay/calcium hydroxide was selected as a basic binder. Then, the amount of SF was chosen as 0%, 7.5%, and 15% of the
This study aimed at investigating the effects of ozone treatment on the dispersion of carbon nanotubes (CNTs) in aqueous solution and the resulting influence on the material properties of ultra-high performance concrete (UHPC). The CNT suspension was fabricated by the ozone treatment and used to produce UHPC/CNT composites. Using spatially-resolved small angle X-ray scattering, the degree of dispersion of CNTs in UHPC matrix was quantitatively evaluated. It was confirmed that the ozone treatment
This paper presents the structural performance of jacketed concrete columns subjected to cyclic lateral loading using ultrahigh-performance fiber-reinforced concrete (UHPFRC) with various advantages as construction materials of high strength and durability with self-compacting. The UHPFRC jacketing with/without textile reinforcement for concrete columns for the seismic retrofitting demonstrates its strengthening efficiency and reduction of jacket thickness through the experimental program in thi
This study aims to elucidate the effect of carbon nanotube (CNT) concentrations on the mechanical, electrical, shrinkage, and thermal properties of ultra-high performance concrete (UHPC). The stable dispersion of CNTs was achieved using well-dispersed CNT suspension and confirmed by consistent decrease in electrical resistivity. The autogenous shrinkage was effectively reduced by over 30% by incorporating around 0.5 wt% CNT content. While thermal conductivity was gradually increased with increas
