spallation

/spɔˈleɪʃən/
noun
  1. The process of breaking off into small chips or fragments, especially of rock, concrete, or other hard materials.
    • The spallation of the old bridge's concrete surface was caused by years of weather exposure.
    • Geologists studied the spallation of rocks in the desert due to temperature changes.
    • The construction crew had to repair the spallation on the building's exterior walls.