ABSTRACT
Inscriptions, stone lions, statues, sumeru pedestals, tower foundations and fences in Chengde Mountain Resort or in surrounding temples are mainly made of tuff stone, which are also called as Parrot rock in local. Extreme temperature reaches minus 20 °C in winter, as a result, tuff rock frost heave and shrinkage caused by frequent freezethaw action impact not only the integrity and aesthetics of tuff relics but also the global stability of tuff relics. Diseases such as exfoliation and deep cracks threats on valuable tuff relics are required to be relieved urgently. However, neither tuff rock durability evaluation under environmental factors nor deterioration micro mechanisms researches have been done yet, which are not conducive to preservation of tuff relics.
