Modified bitumen emulsion by anionic polyurethane dispersion nanocomposites

• Published in: Road materials and pavement design Vol. 21; no. 6; pp. 1763 - 1774
• Main Authors: Shirkavand Hadavand, Behzad, Ghobadi Jola, Behzad, Didehban, Khadijeh, Mirshokraie, Ahmad
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 17.08.2020; Lavoisier
• Subjects: anionic polyurethane; bitumen modification; Bitumens; Dispersion; Elastic properties; nanoclay; Nanocomposites; Polyurethane resins; rheological behaviour; Rheological properties; Rheology; Water pollution
• ISSN: 1468-0629; 2164-7402
• DOI: 10.1080/14680629.2019.1567373

Different materials and compounds were used for improving mechanical and rheological properties of bitumen. Replacing the traditional bitumen by emulsion bitumen is increasing due to reduced environmental pollution. In recent years, emulsion bitumen modification has been considered to obtain higher efficiency bitumen with water-dispersible polymers. For this purpose, this study intends to investigate the modification of emulsion bitumen using water-dispersible anion polyurethane nanoclay nanocomposite. Since the polymer elasticity property plays an important role in bitumen modification and its properties, anionic polyurethane with different elastic properties was prepared by changing its structure, and its effects on modifying bitumen emulsion were investigated. Preliminary tests of bitumen properties and rheological behaviour analysis were performed on the prepared samples. The results of the tests showed that the penetration-modified bitumen decreased and softening point increased. As the structure of modifier changes, the rheological behaviour of bitumen is improved and changes from viscous to elastic one.