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Video answers: ‘Relaying airport surfaces’

Here are the answers to last Friday’s video, enjoy!

Suggested ICAO level for video: 5+

  1. They have approximately eight hours to relay this section of taxiway.
  2. They have to dig down a total of 32 inches. (20 inches + 1 foot)
  3. Frost heave, that’s when water and soil freeze, they swell upwards, causing the surface of the taxiway to crack.
  4. The team add a one foot layer of gravel which helps to keep water away from the surface.
  5. It has been chemically altered so that its laying temperature is 55 degrees lower than normal asphalt, meaning it cools and sets 50% faster.

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