Journal of the Korea Institute of Building Construction (한국건축시공학회지)

The Korean Institute of Building Construction (한국건축시공학회)
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Evaluation of Shape Deviation in Phase Change Material Molds Subjected to Hydration Heat During Ultra-High Performance Concrete Free-form Panel Fabrication

UHPC 비정형 패널 제작 시 수화열에 의한 PCM 거푸집의 형상오차 분석

  • Kim, Hong-Yeon (Graduate School, Hanbat National University) ;
  • Cha, Jae-Hyeok (Graduate School, Hanbat National University) ;
  • Youn, Jong-Young (Department of Architectural Engineering, Hanbat National University) ;
  • Kim, Sung-Jin (Department of Architectural Engineering, Hanbat National University) ;
  • Lee, Donghoon (Department of Architectural Engineering, Hanbat National University)
  • Received : 2023.03.28
  • Accepted : 2023.04.24
  • Published : 2023.06.20
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Abstract

The construction of free-form structures with intricate curved exteriors necessitates the use of bespoke molds. To fulfill this requirement, a blend of Phase Change Material(PCM) and Ultra-High Performance Concrete(UHPC) is utilized. PCM endows the solution with recyclability, while UHPC facilitates the effortless execution of curvature in the mold fabrication process. However, it's worth mentioning that the melting point of PCM hovers around 58-64℃, and the heat emanating from UHPC's hydration process can potentially jeopardize the integrity of the PCM mold. Hence, experimental validation of the mold shape is a prerequisite. In the conducted experiment, UHPC was poured into two distinct mold types: one that incorporated a 3mm silicone sheet mounted on the fabricated PCM mold(Panel A), and the other devoid of the silicone sheet(Panel B). The experimental outcomes revealed that Panel A possessed a thickness of 3.793mm, while Panel B exhibited a thickness of 5.72mm. This suggests that the mold lacking the silicone sheet(Panel B) was more susceptible to the thermal effects of hydration. These investigations furnish invaluable fundamental data for the manufacturing of ultra-high strength irregular panels and PCM molds. They contribute substantially to the enrichment of comprehension and application of these materials within the realm of construction.

비정형 건축물은 외부면이 다양한 곡선이기 때문에 비정형 거푸집은 맞춤제작되어 사용된다. 비정형 거푸집 제작에 있어 재활용이 가능한 Phase Change Material(PCM)과 곡률구현에 용이한 Ultra-High Performance Concrete(UHPC)가 사용된다. 그러나 PCM은 약 58~64℃가 융점이며, UHPC의 수화열로 PCM 거푸집이 손상될 수 있어 실험을 통해 형상을 확인한다. 실험은 제작한 PCM 거푸집에 Silicone sheet 3mm를 설치한 (A)와 설치하지 않은 (B) 거푸집에 UHPC를 타설한다. 실험결과 (A) 3.793mm, (B) 5.72mm가 측정되었으며, (B) 거푸집이 수화열에 취약한 것으로 분석되었다. 이러한 연구는 초고강도 비정형 패널 및 PCM 거푸집 제작 관련 기초자료로 활용될 것으로 기대된다.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea(NRF) grant funded by the Korea government (MSIT)(No. 2020R1C1C1012600).

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