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Title |
Bond Performance of Quasi Non-Combustible ETICS under Freeze-Thaw Cycles
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Authors |
하수경(Soo-Kyoung Ha) ; 최기선(Ki-Sun Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2025.29.6.1 |
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Keywords |
외단열 복합시스템; 동결융해 내구성; 부착강도; 직접인발실험; 현장타설 부착공법 External thermal insulation composite systems; Freeze?thaw durability; Bond strength; Pull-off test; Cast-in-place attachment |
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Abstract |
This study conducted a pull-off test to evaluate the bond performance of a quasi non-combustible external thermal insulation composite system (ETICS) cast onto concrete substrates under repeated freeze?thaw conditions. The specimens were manufactured as sandwich panels composed of quasi non-combustible EPS cores with calcium carbonate-based RCB exterior finishing materials on both sides and were exposed to up to 500 freeze? thaw cycles. The results showed that the average bond strength under all cycle conditions satisfied the ETAG 004 minimum requirement of 0.08 MPa, maintaining approximately 22.5% surplus strength even after 500 cycles. Cohesive failure within the insulation core was observed in most specimens, with adhesive failure between dissimilar materials appearing in only one case. These findings suggest that the cast-in-place method ensures reliable bonding at the insulation-to-concrete interface. However, potential quality variations within the composite panel highlight the need for precision in the manufacturing process. Overall, the cast-in-place attachment method is considered an effective approach for securing structural durability and reliability of ETICS affixed to external walls under prolonged freeze?thaw exposure.
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