Generally, reinforcing steel in concrete is protected from corrosion. This happens because the cement content in the concrete has an alkaline effect. It can reduce the risk of corrosion, but the reinforcing steel may still corrode if exposed to a corrosive environment. One method of providing a high protection value against corrosion is the sacrificial anode cathodic protection system. This study aims to evaluate the effectiveness of the sacrificial anode cathodic protection on reinforced concrete. Three types of specimens were used in the study. The specimens were (a) unconnected anode-cathode specimen, (b) connected anode-cathode (design 1), and (c) connected anode-cathode (design 2). The dimensions of the concrete specimen are 1000 mm in length, 100 mm in width, and 100 mm in height. Profometer 5+ was used to locate the reinforcing steel in the concrete. In this study, the condition of the protected criteria of reinforced concrete was achieved within 30 weeks in 2019 after wet-dry cycle treatment in 3.5% NaCl media, and thus, the specimen was exposed in an open air for one year. In 2020, all of the specimens were treated again with a wet-dry cycle for 3 weeks to measure the potential value of the reinforcing steel after a year. The measurement result of the corrosion potential value after one year showed that the specimen (c) had a potential value of -884.67 mV. While the specimen (b) had a potential value of -689 mV. These results show that the specimen (c) still within the protected criteria based on the NACE standard after one year of exposure, whereas the specimen (b) is no longer protected after one year of exposure.
Korosi dapat menyebabkan kegagalan dini pada bangunan infrastruktur, termasuk pada lingkungan sekitaran masyarakat, korosi dapat menyebabkan kerugian besar jika korosi tidak ditangani lebih awal. Korosi dapat dikendalikan dengan proteksi kathodik anoda korban, namun metode tersebut lebih cocok digunakan pada industry karena pengeluaran untuk perawatan cukup mahal. Selain dengan metode anoda korban, korosi juga dapat dikendalikan menggunakan inhibitor. inhibitor ialah senyawa yang apabila ditambahkan dalam jumlah kecil pada suatu sistem korosi bisa mengurangi laju korosi pada konsentrasi tertentu. Sangat banyak inhibitor alami yang dapat diperoleh dari tanaman sekitar untuk menghemat biaya proteksi. Salah satu bahan alami yang dapat menjadi inhibitor korosi adalah belimbing wuluh. Tujuan dari pengabdian ini terdiri dari tujuan umum dan khusus, tujuan umum dari pengabdian ini yaitu untuk memberikan penyuluhan kepada masyarakat bagaimana cara membuat ekstrak daun belimbing wuluh sebagai inhibitor korosi, berhubung permasalahan kelompok tani ingin maju yaitu kontruksi pertanian yang terbuat dari besi seperti pagar mudah berkarat. Tujuan khusus dari pengabdian ini untuk menganalisa efisiensi ekstrak daun belimbing wuluh sebagai inhibitor penghambat korosi. Kegiatan pengabdian dimulai dengan melakukan survey, membuat larutan inhibitor, melakukan pengujian terhadap larutan inhibitor, dan memberikan penyuluhan kepada kelompok tani ingin maju, Dusun Persatuan Gp. Baroh Langsa Lama, Kec Langsa Lama, Kota Langsa
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