Abstract
The aim of this study is to investigate the corrosion performance of reinforcement steels coated with a coating containing wheat straw, sunflower stalk, and corn stalk ashes and moreover to discuss the effect of the coating on the concrete durability. By replacing calcite with different amounts of these organic ashes in the dye production, innovative corrosion inhibitive coating types were introduced. These coating types have been applied both on the reinforcement steels and concrete surface. In order to understand the effects of the coating types produced with these organic ashes, the steel bars coated with them containing 6% of the organic ashes as fine aggregate were embedded into concrete samples. The samples were cured both in tap water and 3.5% NaCl solution for 180 days, and the mass losses of the steel bars were determined. Also, the inhibition efficiency of the coating was determined by using the galvanic cell method and accelerated corrosion tests. Furthermore, mass loss, compressive strength, abrasion resistance, freeze-thaw property, and capillary water permeability of the reinforced concrete samples with the produced coating were investigated. Test results showed that the minimum mass loss ratio in reinforcement was observed as 0.185% in samples coated with all three organic ash-added mixes. Also, for the same samples compressive strength loss was the lowest as 14%. As a result, the durability of concrete and the corrosion resistance of steel bars improve with the addition of wheat straw, sunflower stalk, and corn stalk ashes into the coating and they could be used as environment-friendly corrosion inhibitors.
Highlights
It was found out that the most effective inhibitive coating material in the corrosion of the steel bars which were kept in the NaCl solution for 180 days was the mix containing wheat straw, sunflower stalk, and corn stalk ashes, all together, WSC. e corresponding mass loss ratio was 0.185%. e least mass loss in the single additive cases was observed in group S. e sample with the highest mass loss was the uncoated reference sample, R, with a ratio of 1.679%. is value is approximately nine times the mass loss obtained with the triple combination, WSC. ese results show that these ashes can be
Among the samples kept in NaCl solution, the highest compressive strength loss was observed in R sample with 30% and the lowest in WSC sample with 14%
Protection of reinforcement against corrosion using a coating containing wheat straw, sunflower stalk, and corn stalk ashes was investigated, and the improvements in the corrosion performance were evaluated. e results obtained led to the following conclusions: (i) Among all the samples immersed in NaCl solution for 180 days, the ones coated with WSC had the least mass loss, whereas sample R had the highest
Summary
In addition to other durability problems, the increase in the permeability of concrete initiates and accelerates the corrosion of reinforcement steel [2]. Soft steels which are used as reinforcement in concrete are not resistant to corrosion in atmospheric and aqueous environments. Reinforcement steels in a normal concrete would not be exposed to corrosion [5]. Steel reinforcement would not be subjected to corrosion in dry concrete. In order to evaluate the performance of reinforced concrete subjected to corrosion, changes in the bond properties have been investigated [8, 9]. Studies have shown that when the bond between the reinforcement and surrounding concrete is decreased due to the mass loss of reinforcement caused by corrosion, the widths of the corrosion-induced cracks are increased.
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