Abstract
In the present research, was studied the electrochemical behavior of AISI 304 stainless steel and Galvanized Steel embedded in Ternary Ecological Concrete made with partial substitution of Portland Cement (PC) by combination of Sugar Cane Bagasse Ash and Silica Fume (SCBA-SF) in 10, 20 and 30% and exposed to a 3.5% solution of Na2SO4 as an aggressive medium. For the design of the concrete mixtures was used ACI 211.1 method. Quality control tests of fresh and hardened concrete were carried out in accordance with the ONNCCE and ASTM standards. The electrochemical evaluation was carried out for a period of 6 months, using the techniques of corrosion potential Ecorr (ASTM C-876-15) and Linear Polarization Resistance-LPR- (ASTM G59) to determine the corrosion rate Icorr. The results indicate that AISI 304 SS has a high corrosion resistance from the curing stage to the end of monitoring, with values of Ecorr lower than -200 mV and negligible corrosion levels with values of Icorr below 0.1 µA/cm2, greater protection is identified in the Ternary Ecological Concrete with replacement of 30% of PC by SCBA-SF.
Highlights
Corrosion is a phenomenon that destructively attacks reinforced concrete structures, being one of the main factors causing the reduction or shortening of their useful life, durability and operation [1,2]
The results of increased corrosion of galvanized steel are consistent with those reported in other investigations [32,33,34], which indicate a good protection of galvanized steel, but which depends a lot on the exposure conditions or the aggressiveness of the contact environment
Corrosion resistance in sulfate environments is good in the MC-GAL and M10-GAL specimens, with Icorr values less than 0.1 μA/cm2, indicating a negligible corrosion level or passivation
Summary
Corrosion is a phenomenon that destructively attacks reinforced concrete structures, being one of the main factors causing the reduction or shortening of their useful life, durability and operation [1,2]. This problem is due to the exposure of structures in environments where aggressive or deactivating ions such as sulfates and chlorides are found. Among the causes causing the onset of corrosion are sulphates ions. The objective of present research is to evaluate the corrosion behavior of bars of Galvanized Steel and AISI 304 stainless steel embedded in Conventional Concrete (CC) and Ecological Concrete (EC) made with partial substitution of Portland Cement (PC) by combinations of Sugar Cane Bagasse Ash (SCBA) and Silica Fume (SF) in different percentages (10%, 20% and 30%), agroindustrial and industrial waste of pozzolanic characteristics as indicated in various investigations [9,10]
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