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그래핀 나노리본 혼입 시멘트 경화체의 고온 노출에 의한 기계강도 변화에 관한 연구
리패기 ( Li Pei-qi ),유준성 ( Liu Jun-xing ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
This work explores the effectiveness of graphene nanoribbons (GNRs) in modifying the fire resistance of cement paste. The GNRs are added to the ordinary Portland cement at 0.10 wt% of the cement, and the sample is heated to target temperatures after curing for 28 days. Subsequently, the variations of compressive strength and pore structure are inquired by compared to the control sample without nano reinforcing and the sample with the same amount of carbon nanotubes (CNTs).
그래핀 나노리본 보강 시멘트 복합체의 기계적 전기적 특성 분석
리패기 ( Li Pei-qi ),유준성 ( Liu Jun-xing ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
This study researched the effect of graphene nanoribbons (0.05 wt%) on cement-based materials' mechanical and electrical properties. The results were compared with the ordinary Portland cement (OPC) paste and OPC paste with the same content of carbon nanotubes. The experiment results showed that after curing for 28 days, the compressive and splitting tensile strength of the sample with graphene nanoribbons were increased by 17.8% and 6.6% compared to OPC paste, and its reinforced effect for cement-based materials was superior to carbon nanotubes. Besides, due to the excellent electrical properties of graphene nanoribbons, the sample reinforced by graphene nanoribbons had a lower electrical resistivity (135.5 Ω·m) than OPC paste (418.5 Ω·m) and paste with carbon nanotubes (175.5 Ω·m). This proved the promising application of graphene nanoribbons on cement-based materials.
그래핀 옥사이드 나노리본-기능화 탄소 나노 튜브-그래 핀 옥사이드 복합체 강화 시멘트 페이스트의 내화성에 관한 연구
리패기 ( Li Pei-qi ),서형원 ( Suh Heong-won ),배성철 ( Bae Sung-chul ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
In this paper, we studied the fire resistance properties of the graphene oxide nanoribbons-functionalized carbon nanotubes-graphene oxide (GNFG) complex incorporated cement paste. Experimental results showed that cement paste reinforced with 0.05 wt% GNFG had the higher residual compressive and splitting tensile strengths after heating at 800℃, which were 73.48 and 78.19%, respectively. This also suggests that GNFG can be used as a new nano agent to enhance the fire resistance of cement paste.
산화그래핀-기능성 탄소나노튜브 복합체 합성 및 시멘트 내 혼입 시 물성에 미치는 영향
리패기 ( Li Pei-qi ),유준성 ( Liu Jun-xing ),서형원 ( Suh Heong-won ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
In this paper, we investigated the performance of synthetic graphene oxide-functionalized carbon nanotubes (GF) to promote cement hydration and increase the mechanical properties of cement paste. The enhancement effect of GF on the various properties of cement paste was evaluated via the mechanical strength, X-ray diffraction, and heat of hydration of cement paste. The results clearly showed that GF incorporation into cement paste promotes the early hydration of cement paste, generates more hydration products, which results in the mechanical improvement of cement paste. The compressive and splitting tensile strength were increased by 32.17% and 17.31%, respectively, compared to ordinary Portland cement at 28 days of hydration.
그래핀 나노리본 강화 시멘트 페이스트와 일반 시멘트 페이스트의 전기적 특성 비교 연구
리패기 ( Li Pei-qi ),조성민 ( Cho Seong-min ),배성철 ( Bae Sung-chul ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
In this paper, the electrical properties of the cement paste with graphene nanoribbons (GNRs) were compared to ordinary portland cement paste (OPC). In addition, due to carbon nanotubes (CNTs) are the raw material to synthesize GNRs, the results of sample contained GNRs were also compare to the CNTs. Experimental results showed that cement paste reinforced by 0.05 wt% GNRs had the lowest electrical resistivity. This also suggests that GNRs can be used as a new nano agent to improve the electrical properties of cement paste.
TiO<sub>2</sub> 입자의 사이즈가 바인더젯 3D 프린팅 시멘트계 재료의 특성에 미치는 영향
유준성 ( Liu Jun-xing ),리패기 ( Li Pei-qi ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1
With the development of nano-reinforcement technology, TiO<sub>2</sub> nanomaterials have received widespread attention as one of the additives without pozzolanic reaction, which can be used to improve the mechanical properties of cement-based materials. Meanwhile, with the development of additive manufacturing technology or known as 3D printing technology, its application in the construction field has also got noticed. Therefore, in this work, the effect of three sizes of TiO<sub>2</sub> on the compressive strength of hardened cement-based materials fabricated by binder jetting 3d printing was evaluated. According to the results, the TiO<sub>2</sub> particles with larger sizes can provide better reinforcement to the hardened cement due to its more significant filling effect.
TiO<sub>2</sub> 나노 튜브 함유 된 시멘트 페이스트의 기계적 물성 및 광촉매 성능 평가
유준성 ( Liu Jun-xing ),리패기 ( Li Pei-qi ),배성철 ( Bae Sung-chul ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
With the development of nano-enhancement technology and the increasing importance of environmental issues, cementitious materials with good mechanical and photocatalytic properties through the introduction of TiO<sub>2</sub> nanomaterials have received wide attention. In this work, compressive strength, splitting tensile strength, and degradation of methylene blue solution were used as parameters to evaluate the effect of TiO<sub>2</sub> nanotubes on the mechanical properties and photocatalytic performance of hardened cement paste, respectively. According to the results, after 28 days of curing, the compressive strength and splitting strength of the hardened cement paste increased by 9% and 26%, respectively, at the optimum content (0.5 wt%) of TiO<sub>2</sub> nanotubes. Moreover, TiO<sub>2</sub> nanotubes showed a better photocatalytic effect compared to TiO<sub>2</sub> nanoparticles.