Speaker
Description
Abstract. Globally, transportation agencies are adopting reclamation and recycling strategies for their rehabilitation and construction needs. Cold recycling technologies are regarded as a sustainable approach for rehabil-itating flexible pavements, primarily due to their economic and envi-ronmental benefits. Cold in-place recycling (CIR) as one method in-volves reclaiming a portion of the distressed asphalt layer and incorpo-rating stabilizing agent(s) into the formation of a new base layer. Re-search has shown positive indicators from the use of recycling agents (RA) to treat reclaimed asphalt pavement (RAP) while using them in traditional asphalt mixtures. The impact of RAs on the performance improvement of cold recycled mixtures remains a subject of ongoing re-search. This study assesses the performance of a conventional and RA-treated CIR pavement towards perpetual pavement characteristics. Four test sections were constructed, differing only in the inclusion of RA in two of the test sections, and the existence of stabilized full depth recla-mation (SFDR) sub-base layers in two sections. These sections were subjected to Falling Weight Deflectometer (FWD) tests, spanning a pe-riod of four seasons on the outer wheel paths in both driving and pass-ing lanes following construction and exposure to vehicular traffic. The findings from the back-calculation analysis, when comparing two sec-tions showed that the RA affected the CIR layer's stiffness whereas for two other compared sections, no discernible change in the CIR layer was observed. Perpetual characteristics analysis indicates potential for bottom-up fatigue cracking in all sections, necessitating an optimized design in terms of Hot Mix Asphalt (HMA) and CIR layer thicknesses.
