Abstract
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 30 s. Cementitious joints with conductive resistors also showed complete disassembly with little residual bond strength.
Highlights
The building production technologies that have been realized to date include those for the composition of building materials and structural members, as well as the simplification of assembly processes
The results show outstanding temperature elevation characteristics in the conductive resistor induction-heating experiment
In the case of the steel fiber, the temperature increased with the duration of the induction heating, it did not depend on the radio frequency power as it did with the metal mesh or punching metal
Summary
The building production technologies that have been realized to date include those for the composition of building materials and structural members, as well as the simplification of assembly processes. In Japan, the impurity contents of finishing materials have been greater than 10% of total concrete waste, even if the preceding collection of demolished finishing materials was conducted at demolition site of reinforced concrete structure buildings. This affects the quality of building material recycling as a result [3]. It is expected to provide local heating only for building members and materials that are in contact. This technique is highly regarded as an environment-friendly technique for a forward-backward process. Because wire mesh and rebar are widely used as the conductive materials of the heating source for induction heating in existing buildings, they are judged to be capable of facilitating the easy specification of disassembly properties without the deterioration of the assembly properties
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