Abstract
Demolished concretes are being recycled to produce recycled concrete aggregates (RCA) in different scales around the world. Therefore, applications of RCA as a construction material are being popular by replacing conventional materials. Many research studies have confirmed the potential use of RCA to be applied as an unbound pavement material. However, presence of constituents such as reclaimed asphalt pavement (RAP) in RCA effects on its native properties. Therefore, this study evaluates performance characteristics of RCA with RAP under dynamic loading condition. A series of “repeated load tri-axial (RLT)” test was conducted on RAP blended RCA samples to evaluate the elastic and plastic deformation characteristics with increase of load cycles. The elastic deformation was characterised by resilient modulus and slightly dropped with increase of RAP from 0, 5, 10 to 15% in RCA. Further, it observed a trend of small increase of the plastic deformation of the RCA with the increase of RAP portion. However, presence of RAP up to about 15% in RCA did not significantly affect on the accumulation of permanent strain.
Highlights
Recycling and reusing of C&D waste creates many economic and environmental benefits while enhance the sustainability in construction material industry
The results introduced to allow only up to 15% of reclaimed asphalt pavements (RAP) to be mixed in recycled concrete aggregates (RCA) to assure the required performance
4.1 Effect of RAP and moisture content on plastic properties of RCA Minimize the formation of rut depth in pavement structure is the key aspect in pavement designing
Summary
Recycling and reusing of C&D waste creates many economic and environmental benefits while enhance the sustainability in construction material industry. Concrete is the major component of total among the various types of C&D waste which is greater than 80% in Australia [1]. Recycling the concrete to produce the crushed aggregates is one of the sustainable outcomes of waste management. Utilization of recycled concrete aggregates in granular layers in flexible pavements is a viable alternative since road are typically demanded a huge volume of crushed aggregates. The reclaimed asphalt pavements (RAP) is one of the major constituents in RCA in Australia and its influence on the properties of RCA has not been completely investigated.
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