Abstract
The feasibility of utilizing Reclaimed Asphalt Pavement (RAP) as a replacement for coarse aggregates in Roller Compacted Concretes (RCCs) was assessed. This replacement was performed in different volumetric percentages (25%, 50%, 75%, and 100%). During this process, RAP materials were subject to abrasion and impact in the Los Angeles drum and mixer before being added to the mixture. Compressive strength, splitting tensile strength, flexural strength, crack propagation, Ultrasonic Pulse Velocity (UPV), electrical resistivity, density, and water absorption (in 7, 28, and 90 days of age) tests were done on all mixtures. Results show that utilizing RAP in RCC can cause a drop in the mechanical properties, but it has positive effects on crack propagation of the specimens due to their increased toughness. Increasing the amount of RAP in the mixtures has increased their electrical resistivity, likely owing to the hydrophobic properties of RAP, which causes prevention from connecting pores to each other. The relationship between the mechanical properties and UPV of the mixtures was analysed using regression models. Moreover, one- and two-way ANOVA (analysis of variance) tests were performed on the results at a 95% confidence level. Finally, replacing the coarse aggregates with RAP only up to 75% is suggested if pre-processing is performed.
Highlights
Nowadays, utilizing waste materials in the construction of road pavement is increasing, and there are positive reports regarding their performance
Reclaimed Asphalt Pavement (RAP) materials can be utilized as backfill, base and sub-base course materials, and in manufacturing different concrete and asphalt mixtures
There have been several studies, all of which have two general results in common, firstly, using RAP as a replacement for aggregates causes the mechanical properties of the mixture to drop, and, secondly, replacing coarse aggregates leads to lower strength drops compared with replacing fine aggregates (Abdel-Mohti et al, 2016; Erdem and Blankson, 2014; Huang et al, 2005; Khodair and Luqman, 2017; Khodair and Raza, 2017; Shi et al, 2017; Singh et al, 2017; Singh et al, 2018)
Summary
Nowadays, utilizing waste materials in the construction of road pavement is increasing, and there are positive reports regarding their performance. One of the most valuable recycled materials with pavement applications is RAP, which is produced in millions of tons in different countries annually. RAP materials can be utilized as backfill, base and sub-base course materials, and in manufacturing different concrete and asphalt mixtures. Due to the presence of asphalt in RAP and the quality of its aggregates, it is less frequently used as backfill materials and is mainly utilized for manufacturing different asphalt mixtures. Utilizing RAP for asphalt mixture manufacturing is done by either in-place recycling or central plant recycling, which themselves can be performed in either cold or warm procedure (Jamshidi et al, 2012; Kar et al, 2018; Kriz et al, 2014; Mathias et al, 2009; Niazi and Jalili, 2009; Rahman et al, 2014; Saberi.K et al, 2017; Stroup-Gardiner, 2013; Xie et al, 2017; Yan et al, 2019). There have been several studies, all of which have two general results in common, firstly, using RAP as a replacement for aggregates causes the mechanical properties of the mixture to drop, and, secondly, replacing coarse aggregates leads to lower strength drops compared with replacing fine aggregates (Abdel-Mohti et al, 2016; Erdem and Blankson, 2014; Huang et al, 2005; Khodair and Luqman, 2017; Khodair and Raza, 2017; Shi et al, 2017; Singh et al, 2017; Singh et al, 2018)
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