Authors : Agus Maryoto, Buntara S. Gan, Nor Intang Setyo Hermanto and Rachmad Setijadi
Abstract: Concrete is a man-made rock composed of cement, water and aggregates. During the hardening process of concrete, the amount of water not used in the cement hydration reaction, evaporates. The evaporated water leaves the capillary pores in the concrete. Chloride ions as one of the major ions in sea water, can penetrate into the concrete through these capillaries, resulting in corrosion of reinforcing steel bars. This process begins when the chloride ions reach the surface of the reinforcement. A method to control the corrosion process is by the use of the additives. The additives are utilized to improve the microstructure of concrete by reducing the water absorption. Calcium stearate is a compound that can improve these properties. The study investigated the use of calcium stearate in concrete as a concrete additive. The amount used was 0, 1 and 5 kg/m3 of concrete. Two types of experiments were conducted: the water absorption and accelerated corrosion test. For the water absorption, the test specimen was a cylinder with a diameter of 75 mm and a height of 150 mm while for the accelerated corrosion test the specimen was a beam with a sized about 100×100×200 mm having a plain steel reinforcement bar with a diameter of 12 mm inserted inside. The test results showed that, the addition of calcium stearate in concrete decreased the absorption of 77% and reduced the corrosion by 78%.
Agus Maryoto, Buntara S. Gan, Nor Intang Setyo Hermanto and Rachmad Setijadi, 2017. Protection of Corrosion Attack in Reinforced Concrete Due to Chloride Ion using Calcium Stearate. Journal of Engineering and Applied Sciences, 12: 7965-7970.