English translation: plastering / thixotropic coating
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Explanation: Is this "sous-dalle" or "sous dalle"? If the latter, they may possibly (? total guesswork here) be improving the bearing capacity of the soil by mixing in gypsum and some thixotropic product (basically, thixotropic means it becomes fluid when stirred and solidifies when left to rest - which would be a desirable quality for a material mixed into the ground to improve it - except in earthquakes, possibly!)
xxxBourth Local time: 12:09 Specializes in field Native speaker of: English PRO pts in category: 4135