Abstract
Although there are typical and well-known standard methods for designing hot mix asphalt in the world, there is no unique design method for cold recycled asphalt mixes. The current methods are mainly local or even dependent on technology owners due to the diversity of materials and qualitative control limitations. Currently, most of the design methods are based on 4 inch mold. The major problem of these methods is that in the mix design, the effect of aggregates larger than 25 mm is neglected, while this size of aggregates is used in the recycling projects. Therefore, there is a significant difference between in-situ and laboratory mix behaviors. So, 6-inch mold is used. In this study, a simple mix design has been obtained for reclaimed asphalt pavements (RAP) considering the different amount of emulsified asphalt, Portland cement, three gradations, moisture contents, temperatures, and curing times. For this reason, 315 samples were prepared. The results show that the mixes with aggregates larger than 25 mm have a significant difference with 25 mm and smaller aggregates sizes in terms of mechanical properties and moisture susceptibility. Therefore, 6-inch molds should be used for RAP materials that are larger than 25 mm in the mix design.
Highlights
Asphalt pavements recycling, using cold and hot methods, is one of the most effective rehabilitation and reclamation methods (Ma et al 2016)
The properties studied include determination of the percentage of asphalt according to the ASTM D6307 (2016) and gradation of extracted reclaimed asphalt pavements (RAP) materials according to the ASTM C136 (2014)
According to same role of water and emulsified asphalt on the level of compaction, all of samples were prepared by water and compacted with Marshall hammer
Summary
Asphalt pavements recycling, using cold and hot methods, is one of the most effective rehabilitation and reclamation methods (Ma et al 2016). Cold in-place recycling (CIR) is an option with environmental and economic benefits. It can perform the process of modification and reuse of top layers aggregates through one passage of advanced machinery without causing any damage to its subgrade. Most of the recent mix design methods are based on a series of parameters and characteristics (Marshal resistance, uniaxial compressive strength, indirect tensile strength (ITS), resilient modulus, etc.) along with estimating of their limits and values (Asphalt Recycling and Reclaiming Association 2004; Kavussi, Modarres 2010; Kim 2007; Suleiman 2002). The optimum value of each constituent and mix design are specified
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