Analysis of binary Bitumen – Polymer mixtures




bitumen, polymer modified bitumen, asphalt


Bitumen  is  a  black  material  composed  of  a  mixture  of  various  natural hydrocarbons. Bitumen has been commonly used in road paving and roofing applications thanks to its hydrophobic and adhesives properties. The production of  Polymer  Modified  Bitumens  (PMB)  has  allowed  the  development  of materials with better performance in comparison to pure bitumen. This work presents  the  effect  of  addition  of  polymer  to  a  Colombian  bitumen  from  its  morphological, rheological and thermal properties, in order to identify different modification levels. The polymers used as modifiers were polyethylene wax (CPE), styrene butadiene styrene (SBS) and crumb rubber (CR). They were added to bitumen in proportions between 3 to 15% w / w. Both neat bitumen and PMB were characterized by penetration and softening point. Thermal and rheological characteristics were analyzed by differential scanning calorimetry (DSC) and rotational rheometry, respectively. Changes in the morphology were measured by atomic force microscopy (AFM). The experimental results showed that the CPE mixtures had the most pronounced effect on the conventional properties,  achieving  a  75%  reduction  in  penetration  and  a  250%  increase  in  the softening point compared to neat bitumen. The results obtained by DSC allowed identifying three glass transition temperatures (Tg) in neat bitumen. Mixtures with SBS altered Tg, showing changes on the thermal characteristics of neat bitumen. Mixtures with CPE and SBS showed the highest values of G*.  The  results  obtained  by  AFM  help  identifying three different phases in neat bitumen and its variation with the addition of different polymer modifiers, showing considerable structural changes that led to changes in the material properties at the macroscopic level.

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Author Biographies

E. Alexander Ossa, EAFIT University

Full Professor, Department of Production Engineering, School of Engineering.

Juan Camilo Múnera , EAFIT University

Engineering Materials Research Group.


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How to Cite

Ossa, E. A., & Múnera , J. C. (2014). Analysis of binary Bitumen – Polymer mixtures. Revista Facultad De Ingeniería Universidad De Antioquia, (70), 18–33.

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