Asphalt roads' maintenance and construction work require massive amounts of non-renewable fossil-based products and natural aggregates annually. To mitigate environmental problems and to promote the transition to a circular and bio-based economy, the use of sustainable materials in asphalt pavement is in urgent demand [1]. Different waste materials, including recycled asphalt pavement (RAP) and bio-based products, have been attempted in asphalt construction [1]. In the recent past, wood-based by-products, and particularly lignin and Tall Oil Pitch (TOP) (residue from the distillation of crude tall oil, which is a by-product of the paper industry), have been tried to be used in asphalt materials as additives or to replace partially or completely the fossil-based binders [3]. Since their use allows to lower the overall environmental footprint of asphalt materials, generating in some cases carbon-neutral materials for paving construction, the industry is looking at the potential use of these biobased materials to replace the fossil-based binder. And their use in combination with RAP could help in saving more natural resources. However, the performances of these bio-based binders highly depend on the source, the process used to obtain them, and the materials and additives used in combination with them [3]. In the present work, a Bio-based polymer modified binder (Bio 25/55-55) was produced starting from a plain binder 30/45 and adding 5% of TOP and 3.5% of SBS to it. These quantities of TOP and SBS were decided to achieve the Penetration and Softening Point of a reference polymer modified binder 25/55-55 (Ref. 25/55-55). The blending protocol was based on ASTM D 4887. Moreover, bituminous blends composed with the Bio 25/55-55 and 50% RAP binder were produced. The RAP binder was extracted with a rotatory evaporator from a real RAP source (EN 12697-3). All the binders' traditional properties, such as Penetration and Softening Point, were evaluated with the Performance Grade (PG) (AASHTO M320). In addition, the performance properties at high, intermediate, and low temperatures were investigated with different testing protocols and aging conditions using the DSR and BBR
Effect of bio materials and polymer modifiers on the performance properties of recycled asphalt binders
Riccardi C.Conceptualization
;
2022-01-01
Abstract
Asphalt roads' maintenance and construction work require massive amounts of non-renewable fossil-based products and natural aggregates annually. To mitigate environmental problems and to promote the transition to a circular and bio-based economy, the use of sustainable materials in asphalt pavement is in urgent demand [1]. Different waste materials, including recycled asphalt pavement (RAP) and bio-based products, have been attempted in asphalt construction [1]. In the recent past, wood-based by-products, and particularly lignin and Tall Oil Pitch (TOP) (residue from the distillation of crude tall oil, which is a by-product of the paper industry), have been tried to be used in asphalt materials as additives or to replace partially or completely the fossil-based binders [3]. Since their use allows to lower the overall environmental footprint of asphalt materials, generating in some cases carbon-neutral materials for paving construction, the industry is looking at the potential use of these biobased materials to replace the fossil-based binder. And their use in combination with RAP could help in saving more natural resources. However, the performances of these bio-based binders highly depend on the source, the process used to obtain them, and the materials and additives used in combination with them [3]. In the present work, a Bio-based polymer modified binder (Bio 25/55-55) was produced starting from a plain binder 30/45 and adding 5% of TOP and 3.5% of SBS to it. These quantities of TOP and SBS were decided to achieve the Penetration and Softening Point of a reference polymer modified binder 25/55-55 (Ref. 25/55-55). The blending protocol was based on ASTM D 4887. Moreover, bituminous blends composed with the Bio 25/55-55 and 50% RAP binder were produced. The RAP binder was extracted with a rotatory evaporator from a real RAP source (EN 12697-3). All the binders' traditional properties, such as Penetration and Softening Point, were evaluated with the Performance Grade (PG) (AASHTO M320). In addition, the performance properties at high, intermediate, and low temperatures were investigated with different testing protocols and aging conditions using the DSR and BBRI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
