㎔/Sub-㎜ 전자기파를 이용한 나노콘크리트의 분포도 영상화 기술 기초 연구

초록

Recently, many studies on nanomaterials such as carbon nanotube and graphene have been conducted in many research areas. In early times, nanomaterials have been applied to composite materials in mechanics and aeronautics. Also, applications of nanomaterials have been gradually increasing in civil engineering in order to improve compressive strength of concrete. In studies on improving compressive strength of concrete, dispersion of nanomaterials is the key factor to guarantee the performance because nanomaterials can role as a kind of defect when they are applied with low dispersion. Generally, destructive testing methods like SEM are used for investigating the dispersion of nanomaterials by extracting samples from the specimen. For the reason, a new nondestructive testing method is highly required to promote the commercialization of products with nanomaterials like nano-concrete in the future. Among many nondestructive testing methods, a testing method using THz/Sub-mm electromagnetic waves can be a good candidate for visualizing the dispersion of nanomaterials nondestructively because they have merits of both microwave and infrared radiation, going straight and penetrating an obstacle. In this paper, optical properties of nano-cement mortar specimens are measured as a fundamental study and this can prove the possibility of a system for visualizing the dispersion of various nanomaterials within structures.