The effects of SO2 and NO2 on the atmospheric corrosion of a limestone were studied by means of laboratory experiments performed on a local building material ("Scaglia") using a special apparatus simulating dry deposition of pollutants. After accurate characterization of the material, experiments were performed at different SO2 and NO2 concentrations in dynamic flow conditions at constant temperature and relative humidity (25 degrees C and 100 per cent, respectively), for a total duration of approximately three weeks. "Scaglia" limestone reveals a reactive behaviour to acid attack, which is mainly related to the small grain and pore size of the material. Nevertheless, a rapid change of the rate-mechanism from chemical reaction to solid state diffusion is expected in the longer term owing to rapid plugging of the pores.
Corrosion of limestone in humid air containing SO2 and NO2: results after short-term laboratory experiments
MORONI, Beatrice;POLI, Giampiero
1996
Abstract
The effects of SO2 and NO2 on the atmospheric corrosion of a limestone were studied by means of laboratory experiments performed on a local building material ("Scaglia") using a special apparatus simulating dry deposition of pollutants. After accurate characterization of the material, experiments were performed at different SO2 and NO2 concentrations in dynamic flow conditions at constant temperature and relative humidity (25 degrees C and 100 per cent, respectively), for a total duration of approximately three weeks. "Scaglia" limestone reveals a reactive behaviour to acid attack, which is mainly related to the small grain and pore size of the material. Nevertheless, a rapid change of the rate-mechanism from chemical reaction to solid state diffusion is expected in the longer term owing to rapid plugging of the pores.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
