چكيده به لاتين
Abstract:
Considering present lack of natural resources and increase in energy price all around world, to recycle waste materials is one of the priorities for any country. Recycling construction waste has also been widespread in construction industry. With regard to pavement, the material lost their desired service conditions, are removed from pavement through one of asphalt reclaimed methods and are recycled through several phases. Hot in-place recycling is one of the methods through which RAP materials are removed from the surface of pavement, smashed, grained and blended with binder materials and/or rejuvenators or they are produced in a central asphalt factory without any new aggregates or are produced by hot method in place according to technical characteristics of hot mix asphalt and are distributed and grinded.
Therefore, the quality of materials of RAP such as graining and characteristics of materials, quantity and characteristics of bitumen in such mixes are very important parameters. This research aims to examine the performance of RAP (in 0, 25, 50, 75, and 100 %) in hot reclaimed asphalt containing Nano-clay (in 0, 2, 4, and 6%).
The research has been conducted in several stages; firstly, aggregates and RAP and new binder were provided and the percent of RAP was indicated. Secondly, the tests related to new binder, binder of RAP, graining and physical characterization of aggregates of RAP and new aggregates were conducted and Marshal Samples were designed for indicating the percent of optimum bitumen. Thirdly, mixtures contain different percent of RAP with different percent of nano-clay were prepared by gyratory machine. Finally, resilient modules, creep resistant, moisture damage, and Marshal Test have been employed in order to examine the performance of the samples. 60/70 binder as new binder, Sigma Aldrich Nano-clay and sycologne rejuvenator have been used for preparing samples. Accordingly, the samples have been produced by Marshal method.
Key words: resilient modules, creep resistant, moisture damage, Nano-clay, RAP
