Nanotechnology Asphalt Could Last Twice as Long

In spite of many attempts to replace it with a more suitable material, asphalt concrete remains the best and cheapest material for paving roads. Vulnerable to heat, ice, ultraviolet light and mechanical stress, it has a relatively short lifespan and has to be repaired or replaced at regular intervals. Swiss engineers say they may have found a formula for asphalt with self-healing properties VOA’s George Putic reports.