|
Title |
Safety and Concrete Quality Evaluation According to Surface Treatment Method and the Number of Reuses of Aluminum Formwork
|
|
Authors |
장홍석(Hong-Seok Jang) ; 김성일(Sung-il Kim) ; 소승영(Seung-Young So) |
|
DOI |
https://doi.org/10.11112/jksmi.2025.29.3.10 |
|
Keywords |
거푸집 해체; 폴리프로필렌 시트지; 이형제; 당김 강도; 반발경도; 전용횟수 Formwork demolding; PP sheet; Release agent; Pull value; Rebound hardness; Number of reuses |
|
Abstract |
When using a formwork exclusively, the concrete residue remaining on the surface gradually accumulates and increases as the number of uses increases. This residue reduces the release performance when the formwork is demolded and causes unevenness and voids on the concrete surface, causing physical adverse effects on the surface. This study aimed to evaluate the usability of polypropylene(PP) sheet with excellent release properties attached to the surface of aluminum formwork for walls. The pull strength required for formwork removal according to the number of reuses was measured, and the formwork and concrete surface conditions were visually inspected according to the type of PP sheet, whether it was cleaned, and whether release agent was applied. As a result of the study, As the reuses increased, the newly poured concrete was more easily attached to the concrete residue on the panel surface, expanding its area and showing a shape that was completely covered. The lower the pull value required for removing the formwork during formwork dismoling, the fewer the unevenness of the concrete surface after the formwork was demolded, and the result of measuring the rebound hardness of the concrete surface showed a high average rebound hardness.
|