Abstract
To ensure the standard properties of half-warm asphalt (HWA) mixes produced with foamed bitumen, the binder needs to have the best possible characteristics. One way to attain this is to modify the bitumen before it is foamed. The 50/70 penetration bitumen used in this study, was modified with a surface active agent (SAA) at different rates (0.2%, 0.4%, and 0.6% by wt.). The effect of the modifier on the bitumen properties (penetration, softening point, the Fraass breaking point, dynamic viscosity at 60 °C, 90 °C, and 135 °C) and on the binder foaming parameters (expansion ratio - ER, half-life - HL, foam index - FI) was investigated and the optimum quantity of foaming water was determined. Statistical analysis of the results showed that the addition of 0.6% SAA had the most beneficial effect on the set of 50/70 bitumen standard properties and foaming characteristics.
Highlights
The majority of asphalt road surfaces are made of traditional hot bituminous mixtures (HMA)
50/70showed penetration bitumen used in foamed bitumen processactive were investigated
The analysis of the results showed that the surface active agent (SAA) content affected the tested 50/70 bitumen characteristics in different ways depending on the evaluated properties: the SAA content affected the tested 50/70 bitumen characteristics in different ways depending on the evaluated properties:
Summary
The majority of asphalt road surfaces are made of traditional hot bituminous mixtures (HMA). A technology that allows lowering the mix production temperature even further to around 100 ◦ C is labelled half warm mix asphalt (HWA) and makes use of bitumen foamed with water [26,27,28]. The foam characteristics of the HWA binder should have higher values to meet the higher requirements set forth for the bituminous mixes intended for the upper layers of the pavement structure For this purpose, before foaming the bitumen was modified by adding various types of additives. The F-T wax was found to significantly enhance the bitumen foam characteristics [33,34], reduce the viscosity of the bitumen within the operating temperature range [35], improve the rheological parameters of the binder [36] and increase the resistance of the bituminous mix to permanent deformations [37,38]. The aim of this study was to assess the impact of a surface active agent on the conventional and foaming properties of a 50/70 penetration bitumen and its prospects as a way for improving the foaming performance of the investigated bitumen
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
