Abstract
The effect of meteorological variables such as relative humidity, maximum temperature, and predominant wind orientation, as well as oxidant species on the variation of mechanical resistance to compression of the cylinders extracted from two electric transmission towers was investigated. The obtained results are compared with the mechanical strength to compression achieved in concrete cylinders prepared in the laboratory and submerged in solutions of nitric acid and sulfuric acid in concentrations taken from the statistical data of nitrous oxide and sulfurous present in the environment where have installed the towers under study. The results show a decrease in the mechanical strength of the exposed cores in the predominant direction of the wind and of the cylinders submerged in the solution with acids, concluding that both conditions favor the degradation of concrete properties.
Highlights
One of the most significant effects of global climate change is the increase in the rate of deterioration of reinforced concrete structures due to the corrosion induced by carbonation Reference [1] shows with penetration, by diffusion from the external environment, the carbon dioxide reacts with the calcium hydroxide present in the hydrated concrete, forming the calcium carbonate
To obtain the mechanical compressive strength was divided the maximum load supported by the sample during the test, between its crosssectional area, the length/diameter ratio for the sample T1C2 is 1.33, less than 1.75 so it was necessary to make use of correction factors
It can be explained because, in the presence of water, it reacts with calcium hydroxide to generate calcium oxide and hydrated silicon the compound that is the key contributor to concrete strength
Summary
One of the most significant effects of global climate change is the increase in the rate of deterioration of reinforced concrete structures due to the corrosion induced by carbonation Reference [1] shows with penetration, by diffusion from the external environment, the carbon dioxide reacts with the calcium hydroxide present in the hydrated concrete, forming the calcium carbonate. This reaction known as carbonation decreases the alkalinity of the concrete by breaking the passive film around the reinforcing rod that prevents corrosion [2]. They implemented meteorological stations to help evaluate the aggressiveness of atmospheric pollutants, considering corrosive environments due to salinity and industrial pollutants and less aggressive in regions remote from the source of those pollutants
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