MasterChef inspires Highways England funded self-healing road project

After watching a contestant on the Spanish version of the show use a technique known as spherification (the controlled jellification of a liquid to form spheres), Dr Alvaro Garcia, from the Nottingham Transportation Engineering Centre (NTEC), began exploring how the addition of microcapsules of oil to asphalt could be used to create self-repairing road surfaces.

The idea is that as cracks appear in the road the capsules break open, releasing the oil within and softening the asphalt around it. This helps the asphalt ‘stick’ back together, effectively filling in cracks and preventing small defects from deteriorating further.

Working with funding from Highways England, Garcia’s team has created and carried laboratory tests on microcapsules filled with sunflower oil.  Commenting on the research Garcia said, ‘Our preliminary results showed that the capsules can resist the mixing and compaction processes without significantly reducing the physical and mechanical properties of asphalt and they also increased its durability. More importantly, we found that the cracked asphalt samples were restored to their full strength, two days after the sunflower oil was released.’