Foundation, Concrete and Earthquake Engineering

What is Acid Rain? and What are its impacts on structure?

From 18th  century acid rain has been observed in many places of world industrial emissions are above pollution level. Chemical chemical precursors of sulfuric and nitric acids combine with natural sources of acidic particles results acid rain. Precursors are nitrogen oxide (NOx) and sulfur dioxide (SO2). Acidic particles are from volcanoes and decaying vegetation. This mixture when reacts with oxygen, water and other chemicals the acid carried to soil and groundwater through rain snow, frost and mist.

The scenario of USA are- 2/3 of all SO2 and 1/4 of the NOx emissions in the atmosphere are generated from coals that burn in power plants and agricultural and vehicular equipment that use gasoline as fuel. It can be said that some wear on building structures in industrialized regions might be occurred due to acid rain. But in some arid regions where dry depositions containing acidic pollutants, forms on buildings can suffer more sticking. 
Rusting and Subsequent Corossion of steel due to acid rain
In this arid regions when rain or snow falls, subsequent wet deposition of nitric and sulfuric acids becomes more acidic. These acidic components than wash into soil and subsequently recharge aquifers.
silver bridge on ohio river fails due to acid rain

streaking and discolorization of bridges and commercial or industrial metal buildings have been observed from many years due to impact of acid rain. This is due to corrosion of bronze, zinc, nickel, carbon-steel and copper.
Acid Rain Silver Bridge fails due to rusting and corrosion.
When limestone and marble are used as building stone, the acidic chemicals of acid rain dissolve them easily. All minerals, paint and road overlay are affected to some degree due to acid element of acid rain.

No comments:

Post a Comment