UK Team Invents Self-Healing Road Surface To Prevent Potholes

An anonymous reader quotes a report from The Guardian: For all motorists, but perhaps the Ferrari-collecting rocker Rod Stewart in particular, it will be music to the ears: researchers have developed a road surface that heals when it cracks, preventing potholes without a need for human intervention. The international team devised a self-healing bitumen that mends cracks as they form by fusing the asphalt back together. In laboratory tests, pieces of the material repaired small fractures within an hour of them first appearing. 'When you close the cracks you prevent potholes forming in the future and extend the lifespan of the road,' said Dr Jose Norambuena-Contreras, a researcher on the project at Swansea University. 'We can extend the surface lifespan by 30%.'

Potholes typically start from small surface cracks that form under the weight of traffic. These allow water to seep into the road surface, where it causes more damage through cycles of freezing and thawing. Bitumen, the sticky black substance used in asphalt, becomes susceptible to cracking when it hardens through oxidation. To make the self-healing bitumen, the researchers mixed in tiny porous plant spores soaked in recycled oils. When the road surface is compressed by passing traffic, it squeezes the spores, which release their oil into any nearby cracks. The oils soften the bitumen enough for it to flow and seal the cracks. Working with researchers at King's College London and Google Cloud, the scientists used machine learning, a form of artificial intelligence, to model the movement of organic molecules in bitumen and simulate the behaviour of the self-healing material to see how it responded to newly formed cracks. The material could be scaled up for use on British roads in a couple of years, the researchers believe. Google published a blog post with more information about the 'self-healing' asphalt.

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