Abstract
Stone mastic asphalt (SMA) mixtures exhibit excellent behaviour; they are highly resistant to reflective cracking and permanent deformation, as well as providing the wearing surface with an optimal texture. However, the production and compaction temperatures are similar to conventional mixtures, which means that there is a significant consumption of energy, as well as greenhouse gas emissions. Warm mix asphalt (WMA) technology, which has been developed over the last few years, might allow lower temperatures without compromising the mechanical behaviour of the mixtures. Also, over the last few decades, rubberized asphalt has proved to be effective in improving the performance and being environmentally suitable, but it requires higher production temperatures than conventional mixtures. In this study, several tests were performed to evaluate the effect of a chemical WMA additive on the compactability and water sensitivity of rubberized SMA mixtures with both the Marshall and the gyratory compactor. The investigation has shown that the gyratory compactor is more suitable for studying compactability and the water sensitivity of rubberized SMA with WMA additives.
Highlights
Stone mastic asphalt (SMA) mixtures offer increased durability, are highly resistant to permanent deformation and reflective cracking and provide a wearing surface with a proper texture
Several tests were performed to evaluate the effect of a chemical Warm mix asphalt (WMA) additive on the compactability and water sensitivity of rubberized SMA mixtures with both the Marshall and the gyratory compactor
These characteristics are based on the high content of binder that is achieved with a good mineral skeleton, a high proportion of filler and the incorporation of additives, especially cellulose fibres, which allow for a higher content of binder without risk of binder drainage
Summary
Stone mastic asphalt (SMA) mixtures offer increased durability, are highly resistant to permanent deformation and reflective cracking and provide a wearing surface with a proper texture. These characteristics are based on the high content of binder that is achieved with a good mineral skeleton, a high proportion of filler and the incorporation of additives, especially cellulose fibres, which allow for a higher content of binder without risk of binder drainage. Polyamide fibres and fibres, including those coming from the recycling of cardboard cellulose, are the most common stabilizing additives for the prevention of the drain-down of the binder [1] These types of cellulose fibres from recycling give the SMA mixture an excellent performance against drain-down, plastic deformation or water susceptibility [2].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
