PURPOSES : The frequency and severity of natural disasters such as torrential rain or typhoons have become increasingly significant worldwide. Events such as summer typhoons and localized torrential downpour can cause severe damages to a residential area and road networks, resulting in serious harm to the daily lives of people, especially in rural areas by isolating residents from road networks. An immediate and emergency repair technology for the collapsed road networks is urgently needed. This study introduces a new technology to repair road bases or slopes. METHODS: The development of new technology for emergency and permanent repair consists of first, packing of cement paste-coated gravel, second, combining appropriate equipment, and third, conducting a field applicability test. In this research, the compressive strength of cement pastecoated gravel, gravel-netting concrete properties, and packing efficiency were determined, and a full scale field mock-up test was carried out. RESULTS : The compressive strength of the cement paste-coated gravel concrete satisfied the required limit for road base of 5 MPa after 7 days. With appropriate netting materials and packing size, gravel-netting concrete was successful up to a slope of 1:1.5. The full scale field mockup test showed efficiency in the field and penetration resistance performance. CONCLUSIONS: The new technology of emergency and permanent repair for damaged road bases and slopes, introduced in this study, showed satisfactory performance. The technology is expected to be applied in the field when construction procedures and quality specifications are made.

PURPOSES : The objective of this study is to develop new pothole repair materials using polyurethane-modified asphalt binder, and to evaluate them relative to current pothole repair materials in order to improve the performance of repaired asphalt pavement. METHODS : In the laboratory, polyurethane-modified asphalt binder is developed, and then asphalt binder is added to produce pothole repair materials. In order to evaluate the properties of this new pothole repair material, both an indirect tension strength test and a direct tension strength test are performed to measure the material strength and bond strength, respectively. Additionally, the basic material properties are evaluated using the asphalt cold mix manual. The strength characteristics based on curing times are evaluated using a total of 7 types of materials (3 types of current materials, 2 types of new materials, and 2 types of moisture conditioned new materials). The indirect tension strength tests are conducted at 1, 2, 4, 8, 16, and 32 days of curing time. The bond strength between current HMA(Hot Mix Asphalt) and the new materials is evaluated by the direct tension strength test. RESULTS AND CONCLUSIONS : Overall, the new materials show better properties than current materials. Based on the test results, the new materials demonstrate less susceptibility to moisture, faster curing times, and an improved bond strength between HMA and the new materials. Therefore, the use of the new materials reported in this study may lead to enhanced performance of repairs made to asphalt pavement potholes.

태풍, 호우등 자연재해로 인한 사회기반시설물 피해를 예방하고 저감시키기 위한 예방 차원의 연구는 다각도로 수행되고 있는 반면, 대응 및 응급복구를 향상시키기 위한 연구는 미비한 실정이다. 본 논문에서는 효율적이고 신속한 피해복구를 지원하고자 피해복구 의사결정 지원시스템의 개발방안에 관한 연구를 수행하였다. 피해복구 의사결정 지원시스템은 복구자원 관리, 복구 우선순위도출, 피해복구 종합계획 수립 및 복구 지원 요청의 세부 모듈로 이루어져 있다. 복구자원관리 부분은 여러 개의 DB 엔티티로 구성되어 있으며, 복구에 필요한 모든 자원을 포함한다. 복구자원(인력 및 장비)은 복구공법과 연계되어 피해복구 종합계획 수립에 사용되며, 복구자원관리 모듈을 통해 효율적으로 관리할 수 있도록 설계하였다. 그와 더불어, 시스템 아키텍처, 복구자원 현행화 방안, ODATA 활용, DB설계, Map을 이용한 자원 정보 표출, 그리고 복구계획 및 실시에 대한 개념설계를 수행하였다. 본 연구는 사회기반시설물에 재해가 발생했을 때 보다 신속하게 복구하여, 2차 피해확산을 방지하고, 인명 및 재산 피해를 최소화 하는데 적용될 수 있을 것으로 판단된다.