The impact of corrosion due to salinity levels in the eastern zone of krueng aceh on the service life of steel frame building structural elements

Abstract

Abstract The use of profile steel as the main element in construction has gained significant popularity due to its mechanical strength and ease of workability. Corrosion is a problem that occurs within steel as a result of the chemical interaction between the steel and its surrounding environment. The purpose of this research is to assess the impact of corrosion rate on the service life of steel frame structures in the East Zone of Krueng Aceh based on varying levels of salinity. This study employs direct observation and an experimental method that carry out testing on-site for 30 days on test objects/items. The test specimens consist of steel plates measuring 50mm x 25mm x 5mm with BJ45 quality, which were cut and buried in soil excavated to a depth of approximately 1 to 2 meters for one month while submerged. Subsequently, calculations were made using the Weight Loss Method to obtain the corrosion rate value.The results obtained in Zone II, which has the highest salinity level of 6788 ppm, yielded a corrosion rate value of 0.145 mm/year. In this study, the structural element under consideration is the column. Remaining service life analysis is based on the reduction in the cross-sectional area of the column profile after corrosion, thus assessing the decrease in its strength while referring back to the requirements outlined in SNI 1729:2020. The remaining service life of the steel frame structure in Zone II after corrosion is 21 years. For the test specimens placed in Zone IV, which has the lowest salinity level of 941 ppm.