A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Strategic Highway Research Program (SHRP) developed a rational volumetric mix design procedure called Superpave mix design. It originally required aggregate gradations to pass through a selected number of control points and avoid a restricted zone. However, it has been reported that the effect of Superpave gradation on asphalt pavement performance has been contradictory and/or inconclusive. Also, some agencies experienced difficulty meeting the new gradation requirements and had to adjust the gradation in the field. In addition, the gradation requirement introduced in the Superpave mix design has not fully considered aggregate structure. Therefore, there is a need to modify the Superpave Mix-Design and/or to develop a new procedure to design proper aggregate structure for various types of aggregates in Rhode Island. The present study utilized various existing methods including the Bailey method. The Bailey method provides a systemic approach to determine aggregate structure based on aggregate packing properties. After evaluating the procedures of the Rhode Island Department of Transportation (RIDOT), Superpave Mix Design, and Bailey method, a systemic procedure has been developed to optimize mineral aggregates for high-performing asphalt mixtures. IT is anticipated that volumetric properties of these mixtures can be adjusted by controlling Bailey aggregate ratios.
Strategic Highway Research Program (SHRP) developed a rational volumetric mix design procedure called Superpave mix design. It originally required aggregate gradations to pass through a selected number of control points and avoid a restricted zone. However, it has been reported that the effect of Superpave gradation on asphalt pavement performance has been contradictory and/or inconclusive. Also, some agencies experienced difficulty meeting the new gradation requirements and had to adjust the gradation in the field. In addition, the gradation requirement introduced in the Superpave mix design has not fully considered aggregate structure. Therefore, there is a need to modify the Superpave Mix-Design and/or to develop a new procedure to design proper aggregate structure for various types of aggregates in Rhode Island. The present study utilized various existing methods including the Bailey method. The Bailey method provides a systemic approach to determine aggregate structure based on aggregate packing properties. After evaluating the procedures of the Rhode Island Department of Transportation (RIDOT), Superpave Mix Design, and Bailey method, a systemic procedure has been developed to optimize mineral aggregates for high-performing asphalt mixtures. IT is anticipated that volumetric properties of these mixtures can be adjusted by controlling Bailey aggregate ratios.
Evaluation of Aggregate Gradation and Master Ranges on Performance of Asphalt Mixtures
2006
41 pages
Report
No indication
English
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