Similarities and Differences in Evaluation Methods for Stone or Earthen Surfaces

Abstract eng:
To prevent or repair from natural and anthropogenic weathering, protective layers can be applied to improve hardness of stones and earthen surfaces, to increase their internal cohesion or to prevent them from important water penetration. Earthen surfaces are often considered as hardly measurable and references and guidelines to evaluate treatments rarely exist. In the frame of a national research project financed by the French ministry of culture, earthen surfaces have been stabilized with two biopolymers, linen oil and flour glue. A panel of lab and field methods has been applied to evaluate their efficiency as a protective layer, compatibility with un-treated material, and durability faced to natural weathering. From high-technology methods as surface roughness measurements to the easiest field tests of contact sponge and tape test, we will show that the two stabilized earthen surfaces can be distinguished and their main properties can be underlined. Stone and earthen surfaces can be studied following equivalent protocol and many of the stones methods can be transposed or slightly modified to evaluate earthen surfaces.

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