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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.
TiO<sub>2</sub> 입자 크기 및 구조가 시멘트 페이스트 광촉매 효과에 미치는 영향
유준성 ( Liu Jun-xing ),서형원 ( Suh Heong-won ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.2
With the increasing importance of environmental issues, the cementitious materials with self-cleaning or photocatalytic properties by introducing TiO<sub>2</sub> materials have been gaining a lot of attention. In this work, the influence of TiO<sub>2</sub> particle size and structure on its photocatalytic effect in cement paste was investigated. The degradation of methylene blue solution was used as the parameter for evaluating the photocatalytic effect of micro-TiO<sub>2</sub> (m-TiO<sub>2</sub>), nano-TiO<sub>2</sub> (n-TiO<sub>2</sub>), and TiO<sub>2</sub> nanotube (TNT). Moreover, the effect of these three TiO<sub>2</sub> materials on the cement hydration products was characterized by X-ray diffraction (XRD) and thermgravimetric analysis (TG). According to the results, it can be found that all of the TiO<sub>2</sub> materials promoted the formation of hydration products, especially TNT. On the other hand, the m-TiO<sub>2</sub> exhibited a better photocatalytic effect compared to other materials.
바인더젯 3D 프린팅을 위한 TiO<sub>2</sub> 입자를 함유한 시멘트 기반 재료의 기계적 성능 및 광촉매 특성 분석
유준성 ( Liu Jun-xing ),리패기 ( Li Pei-qi ),배성철 ( Bae Sung-chul ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
The development of advanced 3D printing technologies has opened up new opportunities for customized digital designs in the construction industry. Using nano- and micro-scale additives is expected to improve the performance of cement-based materials in 3D printing. TiO<sub>2</sub> particles have been widely used as reinforcing additives in cement-based materials. Therefore, this study aims to investigate the application of cement-based materials containing multi-size TiO<sub>2</sub> particles in binder jet 3D printing and the effect of different-size TiO<sub>2</sub> particles on the performance of printed samples. TiO<sub>2</sub> particles exhibit an excellent filling effect, which increases the density of the printed samples and promotes hydration, thereby improving the compressive strength of the samples. In addition, larger TiO<sub>2</sub> particles exert more pronounced filling and photocatalytic effects on the resulting samples.
양생기간이 TiO<sub>2</sub> 나노튜브 보강 시멘트 페이스트의 광촉매 효과에 미치는 영향
유준성 ( Liu¸ Jun-xing ),진다형 ( Jin¸ Da-hyung ),배성철 ( Bae¸ Sung-chul ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
With the development of nano-reinforcement technology and the increasing concern for environmental issues, TiO<sub>2</sub> nanomaterials have received wide attention as an additive besides carbon nanomaterials that can be used to enhance the mechanical properties of cement-based materials. Also, TiO<sub>2</sub>-based materials can allow cement-baned materials with photocatalytic capability, providing a potentially effective approach to reduce environmental problems. In this work, compressive strength, splitting tensile strength, and degradation of methylene blue solution were used as target to assess the effect of TiO<sub>2</sub> nanotubes on the mechanical strength and photocatalytic effect of hardened cement paste at different curing time. According to the strength results, the optimum amount of TiO<sub>2</sub> was identified as 0.5% of the weight of cement. Meanwhile, the TiO<sub>2</sub> nanotubes-reinforced specimen exhibited better photocatalytic effect in the early stage of curing.
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.
엑스선 나노영상을 활용한 탄소나노튜브의 혼입이 화재 피해를 입은 시멘트 경화체의 강도회복특성에 미치는 영향 분석
서형원 ( Suh Heong-won ),유준성 ( Liu Jun-xing ),배성철 ( Bae Sung-chul ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
화재에 노출된 시멘트 경화체는 심각한 역학적 성능 저하가 발생되지만, 고온 피해 이후 강도회복 특성에 대한 연구는 부족한 실정이다. 또한, 탄소나노튜브(CNT) 혼입 시멘트 경화체에서 CNT의 혼입이 경화체의 내화성능 및 강도 회복에 미치는 영향에 대한 연구도 부족하다. 그러므로 본 연구에서는 CNT가 혼입된 시멘트 경화체의 고온 가열 이후 재수화에 따른 강도 회복 특성을 조사한 후 강도 회복의 원인 규명을 위한 연구를 진행하였다. 실험 결과, CNT 혼입 시멘트 경화체의 800 ℃ 가열 이후 수중 재수화 시 탁월한 강도 회복은 CNT에 의해 수화물 구조가 밀 하게 형성되었기 때문임을 확인하였다.
PDMS 몰드를 이용하여 제작된 시멘트 경화체 표면의 소수성 평가
진다형 ( Jin¸ Da-hyung ),유준성 ( Liu¸ Jun-xing ),배성철 ( Bae¸ Sung-chul ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2
A hydrophobic surface increases the contact angle between water and cement paste. There are two methods to increase water contact angle, i.e. lowering the surface energy and adjusting the surface roughness of concrete. The hydrophobicity of concrete can be quantitatively evaluated according to the chemical and physical properties of the solid surface. So far, researches have shown the chemical properties of hydrophobic concrete, however it has not covered how to control surface. This study demonstrated the hydrophobic cement paste prepared by low-resolution molds printed with a 3D printer that exhibit rough surface. Thus, we presented the most hydrophobic characteristics of mold.