• 한국도로학회논문집
• /
• 제17권1호
• /
• pp.43-49
• /
• 2015

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.

• 한국도로학회논문집
• /
• 제16권4호
• /
• pp.21-33
• /
• 2014

PURPOSES: The purpose of this study was to break away from the workforce method using cold-mix asphalt mixtures and has a constant quality and has develop repair materials of pre-production asphalt-precast types. METHODS: The selection of the repair material was determined as the results obtained through physical properties of materials and the field applicability. In case of repair materials, values obtained through Marshall stability test & the dynamic stability test & retained stability test as well as the site conditions was considered. In case of adhesive, test results were obtained through examination of the bond strength(tensile, shear) and the field applicability of the adhesive was examined through combined specimens to simulate field applications. RESULTS : According to the results of laboratory tests, in the case of repair materials, Marshall stability and dynamic stability, retained stability of cold-mix reaction type asphalt mixture is the highest. In the case of adhesive, two-component epoxy-urea has a very high bonding strength(tensile, shear) was most excellent. According to the results of field tests, when epoxy-urea was excellent workability. Also, the repair body through actual mock-up test did not occur large deformation and fracture after 12 months. CONCLUSIONS : A suitable repair material is cold-mix reaction type mixture of asphalt-precast, a suitable adhesive is a two-component epoxy-urea.

• 대한토목학회논문집
• /
• 제37권3호
• /
• pp.603-610
• /
• 2017

최근 집중호우, 잦은 강설, 급격한 기온차이 등 환경변화의 가속화에 따라 균열, 단차, 포트홀 등 다양한 형태의 도로 파손이 급증하고 있다. 이중 포트홀 관련 사고는 파손 특징상 대형사고를 유발하며 08년 기준 5년간 약 5배 이상 증가하였다. 매년 포트홀로 인한 인명피해, 차량파손 등 직 간접적인 피해가 증가함에 따라 보다 신속하고 효율적인 관리 대책이 필요하다. 따라서 본 연구에서는 포트홀 규모, 면적과의 상관관계를 통해 체적 보정계수와 보수재료 물량산출 알고리즘을 제시하였다. 제시된 물량산출 알고리즘의 검증을 위해 수도권 지역 15개소의 포트홀을 측정한 결과 통상적으로 개소당 약 5~7 kg까지 발생하던 재료 잔량이 1~2 kg까지 감소하는 것으로 나타났다. 작업자의 주관적인 판단에 의존하여 시공하고 있는 실정에서 포트홀 체적 감지 자동화 통합시스템은 재료/자원 절감뿐 아니라 적정한 보수물량 산정을 통해 다짐상태 등 포장 품질향상에 기여할 수 있을 것이다.