Reuse of Wood Used in Underground Construction and Suggestion of a Method of Differentiation

When demolishing a structure, reusable and secondary materials are obtained, such as lumps of as-phalt and concrete, including articles of excavated construction wood. Most especially, waste woods should be aimed at recycling with the view of effective utilization of resources, controlling wastes generated and conserving the environment. However, they are disposed of as industrial wastes in many cases, because specific uses and methods are not standardized. On the other hand, underground use of wood for the purpose of ground improvement has been suggested as new utilization of logs in large quantities. However, there are few cases in which logs excavated from construction sites are recycled for underground use because their strength and soundness cannot be specified. This study suggests an economical judging method by which timbers generated during construction that would be available for recycling can be identified on site by including excavated materials generated from locations with high moisture content because always being buried in water. wood, youngʼs modulus, longitudinal vibration test