still for protection or restoration of outside existing foremal of absorbent mineral building materials and a uppsettning waterproofing products intended to anvendas at

摘要

A method and a set of impregnation agents for protecting or restoring outdoor objects of absorbent mineral building materials. Impregnation is made with a first agent containing barium salt and calcium salt of a carboxylic acid, e.g. acetic acid, and a water soluble protein, e.g. casein, and optionally silicon tetraalkylester, and immediately thereafter with a second agent containing one or more mono- or dialdehydes, e.g. glyoxal and formaldehyde, and optionally, after drying, with a third agent containing a hydrophobing agent, e.g. a siliane, dissolved in a slowly evaporating hydrocarbon oil. The treated material shows decreased water absorption and increased compression strength.