Lunju, Gabriel F. Risal (2024) Studi Penelitian Pengaruh Selimut Beton Terhadap Laju Korosi Baja Tulangan Dan Gaya Tekan Aksial Kolom Pedestal. Undergraduate thesis, Fakultas Teknik Sipil Universitas Merdeka Malang.

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Abstract

Reinforced concrete is a composite material consisting of concrete and steel reinforcement. This combination provides optimal strength to the building structure.
Concrete is strong in compression and steel reinforcement is strong in tension. One of the factors that affects the corrosion of rebar is the thickness of the concrete
cover. This study aims to evaluate the effect of variations in concrete cover thickness on the corrosion rate of steel reinforcement and the compressive strength of
concrete.
The research involves testing the compressive strength on pedestal columns and testing the corrosion rate on reinforcement steel. The test specimens consist of 15 pedestal columns measuring 15 x 15 x 30 cm. The variations in concrete cover thickness used are 10 mm, 15 mm, and 25 mm. The process to accelerate corrosion on the reinforcement steel was carried out by immersing the test specimens in a 3.5% NaCl solution for 10 days using the galvanostatic method. The compressive strength test was conducted according to ASTM C39 (Determine the compressive strength of cylindrical concrete specimens such as mold cylinders and drill cores) and the corrosion rate test according to ASTM G31 (Standard Practice for laboratory immersion corrosion testing of metals) on the rebar. The research results show a correlation between the thickness of the concrete cover and the corrosion rate and compressive strength. The thicker the concrete cover, the lower the corrosion rate occurring on the steel reinforcement. The test
specimen with a cover thickness of 25 mm showed the lowest corrosion rate (5814 mpy) and the highest compressive strength (392.00 kN). Conversely, the test
specimen with a cover thickness of 10 mm experienced the highest corrosion rate (10315 mpy) and the lowest compressive strength. (322,50 kN)

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