A Comprehensive Study Towards Increasing the Use of Recycled Materials in Asphalt Pavements
Author: Arkan Khudhayer Obaid
Publisher:
Published: 2019
Total Pages:
ISBN-13:
DOWNLOAD EBOOKThis dissertation consists of two parts that are aimed at increasing the use of recycled materials in pavement structures. This first part summarizes the results of a research study that involved the construction of four test sections as part of a pavement resurfacing project to examine the performance of different ground tire rubber (GTR) modified mixes and compare them to that of a conventional polymer modified mix. In the first section (control section), a styrene-butadiene-styrene (SBS) polymer modified asphalt binder meeting performance grade (PG) 70-22M was used in the surface course mixture. Furthermore, the surface course mixtures used in the other three sections a PG 64-22 asphalt binder modified with 7% cryogenic GTR (CR GTR), a PG 64-22 binder modified with 6% cryogenic GTR and 0.5% anti-settling agent (CR GTR+ ASA), and a PG 64-22 binder modified with 7% ambient GTR (AM GTR). All asphalt mixtures included 20% reclaimed asphalt pavement (RAP). Samples of the GTR modified asphalt binders were obtained at the asphalt terminal and asphalt plant and were tested to evaluate the tendency of the different types GTR particles to separate from the modified binder. In addition, samples of the GTR and polymer modified mixes were obtained during construction and were compacted in the laboratory.