Acid Rain Resistance Property of Three Fluoro-organosilane Materials for Carbonate Stone

One of the most important factors of carbonate stone decay is the chemical attack caused by atmospheric pollutants such as acid rain.Simulated acid rain was used to evaluate the protection properties sorts of three commercial fluoro-organosilane(Pelicoat,Coesol and Mellerud) for carbonate stone by continuous immersion method and periodic spraying method.The results showed that the carbonate stone treated with three sorts commercial fluoro-organosilane could not obviously resist acid rain in continuous immersion test.The Ca loss was 5.2481 g/m2,6.3807 g/m2,6.2405 g/m2 for Pelicoat,Coesol and MelleRud respectively during simulated acid rain periodic spraying testing which corresponded to 10 year rainfall in Nanjing city,while the Ca loss was 21.5945 g/m2 for untreated carbonate stone.There are long-term protective effects against acid rain for carbonate stones with Pelicoat,Coesol and MelleRud treated.