earticle

영어

Efficient maintenance and upgrading of a building during its lifecycle are difficult because a cementitious finish uses materials and parts with low disassembly properties. Additionally, the reuse and recycling processes during building demolition also present numerous problems from the perspective of environmental technology. In this study, an induction heating (IH) method was used to disassemble cementitious finish joints, which are widely used to join building members and materials. The IH rapidly and selectively heated and weakened these joints. The temperature elevation characteristics of the cementitious joint materials were measured as a function of several resistor types, including wire meshes and punching metals, which are usually used for cementitious finishing. The disassembly properties were evaluated through various tests using conductive resistors in cementitious joints such as mortar. When steel fiber, punching metal, and wire mesh were used as conductive resistors, the cementitious modifiers could be weakened within 60 s when high frequency output conditon is 2.25kW. But spalling phenomenon of mortar was occurred by induction heating according to moisture condition and polymer contens.

한국어

건식 접합방법에 비하여 시멘트계 접합방법은 건축물의 다양한 접합시스템 가운데 가장 범용적으로 사용되며 조립성이 우수한 반면, 해체 등의 역공정에서 각 부재 및 부품의 분리･분해가 어려운 실정이다. 따라서 본 연구에서는 건축 부재 및 재료의 결합방법으로서 범용적으로 이용되는 시멘트계 접합부에 분해성을 부여하는 것을 목적으로 유도가열 메커니즘의 적용을 도모하였다. 연구결과, 유도가열에 의해 도전성 저항체가 삽입된 시멘트계 접합부의 분해효과를 확인할 수 있었으며, 철제망, 펀칭메탈, 강섬유가 혼입된 시멘트 모르타르는 고주파 출력 2.25kW 조건에서 약 60초 이내에 계면의 취약화가 가능하였다. 그러나 모르타르 내부 함수상태 및 폴리머 함유율에 따라 유도가열에 의한 폭렬현상이 나타나는 경우가 있었다.