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Toughening Characteristics of Plastic Fiber-reinforced Hot-Mix Asphalt Mixtures
유평준,옴병식,최지영 대한토목학회 2012 KSCE JOURNAL OF CIVIL ENGINEERING Vol.16 No.5
With the performance limitation of a conventional hot-mix asphalt mixture, the structural integrity of that is highly needed to be enhanced to increase the fatigue life of the mixture. Various geosynthetic alternatives have been widely utilized, such as geogrid,geotextile, or geomembrane layers at the bottom the mixture or on the top of a subgrade to improve the structural integrity of a hot-mix asphalt pavement system. Although reinforcing effects of such interlayers has been reported with some improvements in hot-mix asphalt pavements’ performances, such as mitigating rut or delaying reflective cracks; however, such alternatives do not enhance toughness, tensile strength, or shear strength of the hot-mix asphalt mixture itself due to that the interlayers are usually installed in between two layers in a pavement system and those interlayers do not mix with hot-mix asphalt mixtures. A new plastic fiberreinforced hot-mix asphalt mixture was proposed in this study to provide more enhanced structural integrity of the mixture not only at the bottom of the mixture but also within the mixture. The developed mixture in this study led to significant enhancements in phenomenological toughness and fatigue life of that at least 1.5 times higher than those for conventional hot-mix asphalt mixtures as resulting from indirect cyclic fatigue tests in loading-control modes and four-point bending beam tests in displacement-control modes.
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Correlation Analysis between Pavement Condition Indices in Korean Roads
Young-chan Suh,Hong-jun Kwon,Ki-soo Park,옴병식,김부일 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
The Korean road network has been aging rapidly. It is necessary to assess the pavement conditions of various road networks inorder to come up with proper rehabilitation strategies against the aging road networks. Pavement management system is an essentialtool for road management, and each road management organization has developed its own pavement condition index for assessingthe road conditions. Nonetheless, because the pavement condition of various types of roads could not be represented by a singlepavement condition index, it was difficult to comprehend the condition of the entire roads of Korea and its changing trend at a glance. Moreover, there has been a limitation on the persuasion of the justification for the use of road management and rehabilitation budgetat national level to the people and the budget office of Korea. This study derived the relationship among the pavement conditionindices of Korean expressways, Korean national highways, and Seoul city roads so that those pavement indices can be represented byone unified pavement condition index. A sensitivity analysis of how variables of pavement distress (roughness, rut depth, and crackratio) influenced each of the pavement condition index was carried out. Then, correlation equations between the pavement conditionindices were developed in order to represent them by a single pavement condition index (NHPCI) through a statistical analysis of thepavement condition monitoring system data over 8 years, and its application plan is proposed.
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