Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Rheological Properties of Asphalt Binder Partially Substituted with Wood Lignin
Concerns about the cost, availability, and environmental impact of using petroleum-based materials have led to development of alternative asphalt binders for flexible pavements. The objective of this study is to investigate the feasibility of using wood lignin, a high-molecular weight powder, as an asphalt substitute or performance modifier. The rheological properties of the virgin asphalt and the lignin-asphalt blends were evaluated using laboratory performance tests according to Superpave specifications. Two types of asphalt binder (PG 64-22 and 76-22) and two lignin replacement contents (5% and 10%) were used in the experiment. It was found that the addition of lignin into the asphalt binder increased the viscosity of asphalt binder. The DSR test results indicate that the addition of lignin improves the rutting resistance of asphalt binder before or after the short-term aging process. However, the stiffening effect is less significant for the polymer-modified binder compared with the virgin binder, which suggests that lignin may chemically react with the cross-linking polymer molecule and does not purely act as filler. The BBR test results show that the addition of lignin does not significantly affect the susceptibility of the asphalt to thermal cracking. In addition, the separation tube test results indicate that the degree of separation varies among different binder types and lignin contents.
Rheological Properties of Asphalt Binder Partially Substituted with Wood Lignin
Concerns about the cost, availability, and environmental impact of using petroleum-based materials have led to development of alternative asphalt binders for flexible pavements. The objective of this study is to investigate the feasibility of using wood lignin, a high-molecular weight powder, as an asphalt substitute or performance modifier. The rheological properties of the virgin asphalt and the lignin-asphalt blends were evaluated using laboratory performance tests according to Superpave specifications. Two types of asphalt binder (PG 64-22 and 76-22) and two lignin replacement contents (5% and 10%) were used in the experiment. It was found that the addition of lignin into the asphalt binder increased the viscosity of asphalt binder. The DSR test results indicate that the addition of lignin improves the rutting resistance of asphalt binder before or after the short-term aging process. However, the stiffening effect is less significant for the polymer-modified binder compared with the virgin binder, which suggests that lignin may chemically react with the cross-linking polymer molecule and does not purely act as filler. The BBR test results show that the addition of lignin does not significantly affect the susceptibility of the asphalt to thermal cracking. In addition, the separation tube test results indicate that the degree of separation varies among different binder types and lignin contents.
Rheological Properties of Asphalt Binder Partially Substituted with Wood Lignin
Wang, Hao (Autor:in) / Derewecki, Kristen (Autor:in)
2013 Airfield & Highway Pavement Conference ; 2013 ; Los Angeles, California, United States
Airfield and Highway Pavement 2013 ; 977-986
18.06.2013
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Rheological properties and anti-aging performance of asphalt binder modified with wood lignin
| Online Contents | 2017
Rheological properties and anti-aging performance of asphalt binder modified with wood lignin
| British Library Online Contents | 2017
Rheological properties and anti-aging performance of asphalt binder modified with wood lignin
| British Library Online Contents | 2017