Performance characteristics of hot mix asphalt with recycled materials

• Main Author: Lee, Zhen Hao.
• Other Authors: Wong Yiik Diew
• Format: Final Year Project
• Language: English
• Published: 2009
• Subjects: DRNTU::Engineering::Civil engineering::Transportation
• Online Access: http://hdl.handle.net/10356/16328
• Institution: Nanyang Technological University

Recycled Concrete Aggregate (RCA) was used as a partial replacement of Indonesian granite aggregates in LTA’s W3B mix to evaluate it’s feasibility in hot mix asphalt (HMA) application. Nine Marshall specimens were fabricated with a binder range of 4.75% to 5.25%. The optimum binder content of 5.3% was adopted from the results of the Marshall Test. An amount of 50% of the top three sieve sizes (>6.3mm) was replaced by RCA in the research. Large pavement slabs of the hybrid mix were fabricated to simulate field constructed conditions. Specimens were cored from the slabs and tests were conducted to compare the performance characteristics of the hybrid HMA mix with conventional W3B mix. The results from the creep tests, on average, revealed higher creep stiffness but lower accumulated strain than those obtained by past studies which involved the fabrication of conventional W3B slab specimens. The findings suggest that the hybrid mix is stiffer and less able to take as much strain as LTA’s W3B mix. The rutting tests showed that the hybrid mix has lower track rate, exhibiting higher rutting resistance than the conventional W3B. This can be due to the specimens being heavily compacted during the fabrication, which keeps the aggregate highly interlocked and resistant to rutting.