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Characterization of styrene-butadiene-styrene polymer modified bitumens - comparison of conventional methods and dynamic mechanical analyses
During the last two decades, increased deterioration of road structures due to increased traffic volumes and loads has been observed in many countries. To counteract this process, several types of improvement of the engineering properties of asphalt pavement have been proposed, one of which is the use of polymers as bitumen modifiers. Today, polymer modified bitumens (PMBs) are gaining wider acceptance in various road applications, such as in heavy duty pavement surfaces (reducing permanent deformation) and open graded courses (improving asphalt strength properties). In order to predict PMB performance in practice, it is necessary to determine fundamental parameters of the binder related to the performance of the asphalt pavement. Rheological properties of styrene-butadiene-styrene polymer (SBS) modified bitumens were studied using conventional test methods (penetration, softening point, kinematic viscosity and Fraass breaking point) and dynamic mechanical analysis (DMA). The study indicated that SBS modification improved the viscoelastic properties of bitumens, which can be demonstrated using DMA but not conventional methods. Significantly improved properties of binders included increased dynamic mechanical moduli and decreased phase angle at high temperatures, as well as reduced complex modulus and increased phase angle at low temperatures. SBS modification also caused reductions in glass transition temperature, Fraass breaking point, and temperature susceptibility. The degree of improvement was observed to be influenced by bitumen source/grade and polymer content/structure. Comparison showed that certain relationships exist between parameters obtained using conventional methods and DMA, such as between penetration and complex modulus, kinematic viscosity and complex viscosity, and Fraass breaking point and glass transition temperature. However, the main conclusion of the study is that conventional test parameters such as penetration and softening point are not suitable for characterisation of rheological properties of SBS modified bitumens.
Characterization of styrene-butadiene-styrene polymer modified bitumens - comparison of conventional methods and dynamic mechanical analyses
During the last two decades, increased deterioration of road structures due to increased traffic volumes and loads has been observed in many countries. To counteract this process, several types of improvement of the engineering properties of asphalt pavement have been proposed, one of which is the use of polymers as bitumen modifiers. Today, polymer modified bitumens (PMBs) are gaining wider acceptance in various road applications, such as in heavy duty pavement surfaces (reducing permanent deformation) and open graded courses (improving asphalt strength properties). In order to predict PMB performance in practice, it is necessary to determine fundamental parameters of the binder related to the performance of the asphalt pavement. Rheological properties of styrene-butadiene-styrene polymer (SBS) modified bitumens were studied using conventional test methods (penetration, softening point, kinematic viscosity and Fraass breaking point) and dynamic mechanical analysis (DMA). The study indicated that SBS modification improved the viscoelastic properties of bitumens, which can be demonstrated using DMA but not conventional methods. Significantly improved properties of binders included increased dynamic mechanical moduli and decreased phase angle at high temperatures, as well as reduced complex modulus and increased phase angle at low temperatures. SBS modification also caused reductions in glass transition temperature, Fraass breaking point, and temperature susceptibility. The degree of improvement was observed to be influenced by bitumen source/grade and polymer content/structure. Comparison showed that certain relationships exist between parameters obtained using conventional methods and DMA, such as between penetration and complex modulus, kinematic viscosity and complex viscosity, and Fraass breaking point and glass transition temperature. However, the main conclusion of the study is that conventional test parameters such as penetration and softening point are not suitable for characterisation of rheological properties of SBS modified bitumens.
Characterization of styrene-butadiene-styrene polymer modified bitumens - comparison of conventional methods and dynamic mechanical analyses
Charakterisierung des rheologischen Verhaltens von mit Styrol-Butadien-Styrol-Polymeren modifizierten Asphaltmischungen für den Strassenbau - Vergleich konventioneller und dynamischer Meßverfahren
Lu, X. (author) / Isacsson, U. (author)
Journal of Testing and Evaluation ; 25 ; 383-390
1997
8 Seiten, 6 Bilder, 6 Tabellen, 14 Quellen
Article (Journal)
English
| British Library Online Contents | 1997
Rheological characterization of styrene-butadiene-styrene copolymer modified bitumens
| Online Contents | 1997
Rheological characterization of styrene-butadiene-styrene copolymer modified bitumens
| British Library Online Contents | 1997
Low-temperature properties of styrene-butadiene-styrene polymer modified bitumens
| Online Contents | 1998