The Effects of Acid Rain to the Strength of Reinforcing Steel
Keywords:
acid rain, tensile strength, reinforcing steelAbstract
The acid rain is a result of the air pollution from the burning of fossil fuels, such as coal, natural gas, and oil, from electricity production and industries. Acid rain is the result of chemical reactions of sulfur dioxide (SO2) or nitrogen dioxides (NO2) with moisture in the air. It is in the form of sulfuric acid (H2SO4) and nitric acid (HNO3). The reinforced concrete and the structure of steel buildings were in the acid rain for long time periods. The buildings may were affected by acid rain to their strength and life of using.
Objective: The objective of this research was to study the effects of acid rain on the maximum tensile strength of reinforcing steels.
Methods: The examples of steels were soaked in nitric acid and sulfuric acid at the concentration of 0.5 percent, 1 percent, 2 percent and 3 percent by moles per volume of solute. The samples were soaked for 15 days, 30 days, 45 days and 60 days. Then the maximum tensile strength and the lost weights of steels were compared.
Results: This study revealed that both the acids types soaking with the increasing of concentrations had a significant effect on the decreasing of the maximum tensile strength of steel. If the concentration of sulfuric acid and nitric acid were the same and the durations of immersion in both acids were equal, the maximum tensile strength of steels soaked in sulfuric acid was decreased significantly compared to those soaked in nitric acid. Comparison of the maximum tensile strength of steel soaked in nitric acid and sulfuric acid at the various immersion periods. This study also indicated that the longer the immersion time of the steel the higher the amount of the decreasing of the maximum tensile strength of steel.
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