Using Recycled Tyre Rubber in Road Paving Mixtures

Hayder Kamil  Shanbaraa; Sarah Safaaldeen Musaa; Noorance Al-Mukarama

Authors

Hayder Kamil Shanbaraa Al-Muthanna University, College of Engineering, Department of Civil Engineering, Samawah, Iraq
Sarah Safaaldeen Musaa Al-Muthanna University, College of Engineering, Department of Civil Engineering, Samawah, Iraq
Noorance Al-Mukarama Al-Muthanna University, College of Engineering, Department of Civil Engineering, Samawah, Iraq

Keywords:

Asphalt mixture, Tyre rubber, Crumb rubber, Dry mixing method, Marshall tests

Abstract

This investigation presents experimental works of using Recycled Tyre Rubber (RTR) in asphalt mixture using dry mixing method. Two types of asphalt mixtures were designed and produced for preparing surface layer. One of them includes well-graded natural aggregate with crumb rubberized binder. Whereas the second mixture implemented by adding specific amounts of RTR as a replacement material of 50% of fine aggregated retaining on sieve No. 50 (0.3 mm). Following that, both prepared mixtures were tested in Marshall apparatus to investigate their volumetric properties. Then, the results of Marshall were compared with the Iraqi general specifications for roads and bridges SORB/R9. The findings showed significant increases in the values of Marshall stability and flow. In addition, contents of voids achieved the acceptable requirements of SORB/R9 in the modified mixtures. Finally, the addition of rubber particles as a past of asphalt mixture contents is a technical process that shows significant improvement of its life, reduces cracking and wear and enhances adhesion and anti-slip properties.