Electronic Theses and Dissertation

Korosi pada baja tulangan merupakan salah satu penyebab utama degradasi struktur beton bertulang, di mana ketebalan selimut beton diyakini memainkan peran penting dalam memperlambat laju korosi. Banyak cara dapat dilakukan untuk menginvestigasi korosi infrastruktur, salah satu peralatan utama dalam menginvestigasi korosi tersebut adalah menggunakan liquid-based reference electrode. Tujuan dari penelitian ini yaitu melakukan analisis pengaruh ketebalan selimut beton terhadap potensial korosi. Dalam penelitian ini, benda uji direndam selama 2 bulan dalam larutan NaCl 3,5%, dan diberi perlakuan wet-dry cycle. Pengukuran nilai potensial baja tulangan dilakukan dengan alat potentiostat dan pengujian yang dilakukan menggunakan metode OCP (Open Circuit Potensial). Kurva polarisasi diperoleh berdasarkan standar ASTM C876. Pengukuran potensial permukaan menggunakan metode half-cell potential mapping. Hasil pengukuran nilai potensial pada beton menunjukan bahwa beton dengan tebal selimut 2 cm memiliki nilai potensial korosi yang lebih tinggi dibandingkan dengan tebal selimut 4 cm, 6 cm, dan 8 cm. Tingkat potensial korosi paling rendah terjadi pada tebal selimut 8 cm. Nilai potensial korosi hasil pengukuran dengan menggunakan liquid-based reference electrode Cu/CuSO4 adalah lebih tinggi dibandingkan dengan nilai potensial korosi pada permukaan beton yang di ukur dengan metode half-cell potential mapping.

Corrosion in reinforcing steel is one of the main causes of degradation in reinforced concrete structures, where the thickness of the concrete cover is believed to play a significant role in slowing down the corrosion rate. There are many ways to investigate infrastructure corrosion, and one of the main tools used for this is a liquid-based reference electrode. The purpose of this study is to analyze the effect of concrete cover thickness on corrosion potential. In this study, the test specimens were immersed for 2 months in a 3.5% NaCl solution and subjected to a wet-dry cycle treatment. The reinforcement steel potential values were measured using a potentiostat, and the tests were conducted using the OCP (Open Circuit Potential) method. The polarization curve was obtained based on ASTM C876 standards. Surface potential measurements were performed using the half-cell potential mapping method. The measurement results of the potential values in concrete showed that concrete with a cover thickness of 2 cm had a higher corrosion potential than those with cover thicknesses of 4 cm, 6 cm, and 8 cm. The lowest corrosion potential occurred with a cover thickness of 8 cm. The corrosion potential values measured using a Cu/CuSO4 liquid-based reference electrode were higher than the corrosion potential values on the concrete surface measured using the half-cell potential mapping method.