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Improving asphalt road pavement with nano-engineered particles

June 22, 2021
Swansea University
New research suggests fumed silica nanoparticles (FSNs) can be used to help improve the performance of warm mix asphalt (WMA).

Warm mix asphalt (WMA) is gaining attention in the asphalt industry as an eco-friendly and sustainable technology. WMA reduces energy consumption while simultaneously minimizing vapors and greenhouse gas emissions during the production of asphalt mixtures in comparison to conventional asphalt. However, high moisture susceptibility and ageing of asphalt make WMA less durable on the roads.

To address both issues in WMA technology, a team from the Energy Safety Research Institute (ESRI) at Swansea University and Braunschweig Pavement Engineering Centre (ISBS) at the Technical University of Braunschweig have discovered potential for fumed silica nanoparticles (FSNs) to be used as an anti-ageing binder that can not only serve to reduce temperature but also significantly overcome limitations caused by moisture susceptibility.

Lead researcher Goshtasp Cheraghian said: "The presented research covers existing gaps in WMA technology. FSNs with large surface area are ideal candidate as a cost-effective and non-toxic materials which can meaningfully impact on shielding asphalt in WMA technology. In addition, our findings on the concept of the molecular interaction between nanoparticle and asphalt binders can open new avenues for the application of nanotechnology in asphalt engineering."

Co-author Sajad Kian said: "It's possible that someday these high surface area NPs will be used in the asphalt and build longer-lasting roadways by minimizing asphalt-related emissions (VOC and CO2) in real world conditions."

Professor Andrew Barron, the Founder and Director of ESRI and the Sêr Cymru Chair of Low Carbon Energy and Environment at Swansea University, said: "Reducing energy and resources is a key goal of ESRI and vital for industry as it moved towards Net Zero."

Story Source:

Materials provided by Swansea University. Note: Content may be edited for style and length.

Journal Reference:

  1. Goshtasp Cheraghian, Michael P. Wistuba, Sajad Kiani, Andrew R. Barron, Ali Behnood. Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles. Scientific Reports, 2021; 11 (1) DOI: 10.1038/s41598-021-90620-w

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Swansea University. "Improving asphalt road pavement with nano-engineered particles." ScienceDaily. ScienceDaily, 22 June 2021. <>.
Swansea University. (2021, June 22). Improving asphalt road pavement with nano-engineered particles. ScienceDaily. Retrieved November 30, 2023 from
Swansea University. "Improving asphalt road pavement with nano-engineered particles." ScienceDaily. (accessed November 30, 2023).

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