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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48487 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Tabatabaee, Nader
- Abstract:
- Pavement preventive maintenance methods such as slurry seals are cost-effective treatments that enhance pavement longevity. Incorporation of recycled materials such as reclaimed asphalt pavement (RAP) into asphalt pavements helps further reduce costs and energy consumption. Because the use of emulsions and pavement preventive methods is uncommon in Iran, there is little experience with the technology in this area. The present study designed and developed slurry seal and emulsion test devices at Sharif University lab to study the feasibility of incorporation of RAP into slurry seal mixtures while respecting the limits specified by the ISSA and ASTM. Two slurry seal mixtures in which cement and hydrated lime were used as filler were then tested. The first type included the slurry seal made with virgin aggregate and the second used RAP as aggregate. The mixtures with the best results were selected and wet cohesion and friction testing (sand patch and British pendulum) was performed on the selected slurry seal mixtures. Cost analysis using the ranking method determined the mixture with the lowest cost and best performance. The results showed that it was possible to prepare slurry seal using RAP. Although the curing time increased by 1 h for RAP aggregate, the wear value in WTAT and vertical displacement decreased by half. Horizontal displacement and the British pendulum test results improved considerably for RAP aggregate. The results of the sand patch test on WTAT samples showed that slurry seals made with RAP should be rolled to improve their friction life. Cost analysis indicated that using RAP as an aggregate in slurry seal decreased costs up to 14%. The slurry seal made with RAP had the highest ranking both in terms of performance and cost. WTAT samples were image analysised to see the effect of two parameter of large aggregate loss and bitumen and small aggregate loss on WTAT results. It was concluded that, as the wear value increased, large aggregate loss increased while bitumen and small aggregate loss decreased
- Keywords:
- Reclaimed Asphalt Pavement (RAP) ; Hydrated Lime ; Image Processing ; Performance Evaluation ; Cost Analysis ; Slurry Seal
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