현재 터널시설물에 대한 점검 시 대부분 기술자의 육안조사에 의존하고 있어 점검자의 판단에 따라 점검결과에 편차가 발생하거나 접근불가 부위에 대한 조사가 어려운 측면이 있다. 이러한 문제점들을 해결하기 위하여 국내외적으로 터널스캐닝 장비가 활발히 개발되고 있는 실정이다. 본 연구에서는 지금까지 국내외에서 개발된 터널스캐닝 장비들의 장단점을 분석하고 향후 개선방안을 도출하고자 하였다. 기 개발된 터널스캐닝 장비들은 공통적으로 거미줄, 물 때, 이물질 등이 손상으로 추출되는 문제가 있고 그 사양에 따라 3D 형상화 불가, 스캔속도의 제약, 내부손상 측정 불가 등의 한계가 있는 것으로 조 사되었다. 이러한 문제점들은 손상패턴 및 빅데이터를 활용한 소프트웨어 개발, 3D 센서 활용, 라인카메라나 열화상 카메라 등을 활용하여 개선한다면 더 신뢰성 있는 터널스캐닝 장비의 개발 및 활용이 가능할 것으로 판단된다.

In the present study, carbon dioxide emission was investigated at various pozzolanic materials such as ordinary Portland cement(OPC), pulverized fuel ash(PFA) and ground granulated blast furnace slag(GGBS). The result of the investigation was worked out at environmental assessment by using triangular method. The raw materials without the additional bulk process rather than materials, carbon dioxide occur to lead to much intension on the environment.

In present study, leaching alkali ions in concrete are measured to inhibition of effect to binder(OPC, GGBS, Loess) at 100 days. As a result, OPC concrete was measured the value of pH 9.15 and GGBS concrete was showed the value of pH 8.61.

In a attempt to verify a reduction characteristic in leaching for hexavalent chromium from concrete structures, concrete specimens blended with Loess additive was exposed to sea environment followed by measuring the concentration of Hexavalent chromium from the specimens. Additional experiments with respect to basic properties of concrete with Loess additive were also performed. The entire results of experiments revealed that the reduction characteristic was predominant for concrete with Loess additive and basic properties of concrete with Loess additive were comparable to that of concrete with OPC.

Electrochemical treatments have been applied to many concrete structures. However, excessive current density degrades the bond strength by the change of microstructure at the steel-concrete interface. In this study, the optimal current density of electrochemical treatment without a influence on the bond strength could be derived from related literatures.