摘要(英) |
Reclaimed asphalt pavement (RAP) after repeated re-use, the variance in component materials not only to affects the quality of variability, but also to influence the durability and sustainability. The objective of research is to enhance the durability of Reclaimed Asphalt Pavement quality for the problems from the analysis of current status, construction conditions and performance in Taiwan.
The research is to analyze the Reclaimed Asphalt Pavement used status in Taiwan by the environmental factors of sub-tropical climatic conditions and traffic etc. , the characteristics of Reclaimed Asphalt Pavement and regulations of official authorities, assess the construction conditions effected of quality, performance and durability in laboratory and in-place by both aspects of if mix uniform and densification. And simulate asphalt material aged speed for short-term and long-term in natural environment by adding to different ratio of Reclaimed Asphalt Pavement and rejuvenator and the results form UV oven, Pressure Aging Vessel (PAV) and Tensile Strength Ratio (TSR) to assess durability of pavement for sub-tropical climate. Propose the solution for current problems of Reclaimed Asphalt Pavement form the research.
For enhanced the strength of pavement for the road of heavy traffic with considering the climate can use higher level asphalt binder AC-30 (3000 Poises) in Taiwan. It should set different standard for official authorities used because of the definition of target viscosity is different form Reclaimed Asphalt viscosity. For higher viscosity RAP, It should restrict the application range for aggregate substitute pavement base and subbase or secondary structures, and suggest using rejuvenator with relevant standards to increase the amount of RAP and enhance quality. Placing in the insulation tube for 6 to 12 hours after RAP mixed could effective increasing its uniformity to enhance pavement performance and uniform temperature when construction. The ratio of adding RAP is less than 40% because of Adding more RAP could enhance stable value, resilient modulus of elasticity and indirect tension value but debasing its uniformity and Tensile Strength Ratio (TSR), adding Antistripping Agent or lime could reduce problems of scaling on environmental conditions in Taiwan.
Enhance the uniformity, performance and durability of RAP by Insulation tube. Appropriate control the ratio of adding RAP is less than 40% could achieve the general pavement the same or better performance. The target viscosity can be set at 3,000 Poises by RAP design methods, reclaimed asphalt viscosity at 5,000 Poises ± 35%, the situation in different cities and counties may do so through the Expert Meeting on the viscosity appropriate adjustments. Due to RAP heating process differences with general pavement, that could ensure construction quality and increasing the durability by effective temperature control.
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