Evaluation for Application of Warm-mix Asphalt Concrete for Rural Road Pavement
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초록
The asphalt pavement industry has introduced the warm-mix asphalt (WMA) as a mean of energy saving and environmentally safe technology, becausethe WMA mixture can be mixed and compacted at 30oC lower than conventional hot-mix asphalt (HMA) at 160oC or higher. The implementation ofWMA can be a good option for paving operations for rural road in remote place, not only due to energy saving and environmental issues, but alsolower working temperature. Using WMA technology, the cooled-down asphalt mixture can be still compacted to meet the quality requirement in narrowwinding rural road in remote places. Therefore, this study is designed to evaluate engineering properties of WMA binders and concretes, which wereprepared for rural road pavement. The objective of the study was to evaluate and suggest proper fundamental properties level of the WMA concretefor rural road pavement. The kinematic viscosity test result indicated that the WMA binders used in this study were effective for compaction at lowertemperature, i.e., at 115oC, compared to the HMA binder. According to strength property analyses, it was found that the WMA concrete was acceptablefor rural road pavement even though it was compacted at 30oC lower level. Since the deformation strength (SD) of 3.2 MPa was found to satisfy ruttingand cracking resistance minimum guidelines, this value was suggested as a minimum SD value for rural road pavement, considering lack of maintenanceprogram for rural area.
Abstract
The asphalt pavement industry has introduced the warm-mix asphalt (WMA) as a mean of energy saving and environmentally safe technology, becausethe WMA mixture can be mixed and compacted at 30oC lower than conventional hot-mix asphalt (HMA) at 160oC or higher. The implementation ofWMA can be a good option for paving operations for rural road in remote place, not only due to energy saving and environmental issues, but alsolower working temperature. Using WMA technology, the cooled-down asphalt mixture can be still compacted to meet the quality requirement in narrowwinding rural road in remote places. Therefore, this study is designed to evaluate engineering properties of WMA binders and concretes, which wereprepared for rural road pavement. The objective of the study was to evaluate and suggest proper fundamental properties level of the WMA concretefor rural road pavement. The kinematic viscosity test result indicated that the WMA binders used in this study were effective for compaction at lowertemperature, i.e., at 115oC, compared to the HMA binder. According to strength property analyses, it was found that the WMA concrete was acceptablefor rural road pavement even though it was compacted at 30oC lower level. Since the deformation strength (SD) of 3.2 MPa was found to satisfy ruttingand cracking resistance minimum guidelines, this value was suggested as a minimum SD value for rural road pavement, considering lack of maintenanceprogram for rural area.
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