In the short term, the answer to potholes is simple — fill them in. In the longer term, road builders are looking at a new type of material that could be pothole-proof. Officially known as an engineered cementitious composite, or ECC, it is both flexible, so less likely to fracture, and capable of filling in its own cracks.

Victor Li, professor of civil engineering at the University of Michigan, whose team developed the concrete, says it reacts with ...


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