2019 – Design of Concrete and Migration Cell Block for Testing Chloride Permeability in Cracked Concrete Using Steady-State Migration Test

Abstract: The impact of chloride ions is very dangerous for concrete in the sea area, especially if the concrete is cracked, because the reinforcement in the concrete will be more exposed to sea water. In this final project, an experiment was carried out to determine the effect of concrete cracks on the penetration of chloride ions on concrete with different compressive strengths with the steady- state migration method. In addition, this research will also see whether there is an effect of the compressive strength of concrete and the addition of additives on the penetration of chloride ions. In this final project an experiment is made in the form of concrete samples with a diameter of 10 cm and a length of 20 cm with the quality of K-250, K-400, and K- 400 + fly ash, which are then cut into concrete slabs with a thickness of 5 cm, then performed cracking in the test sample, with a crack width range from 0.2 mm to 0.8 mm. The making of tools for testing using the steady-state migration method is adjusted to the existing standard, namely the NT-355 code. The average test is carried out for four days using 10V voltage and temperatures below 40oC. Data is taken every 12 hours for small cracks, and 6 hours for large cracks. The hypothesis of this research is that the greater the width of the crack, the greater the effect of chloride ion penetration, which means the greater the concentration of chloride ions.

Keywords: concrete, cracks, steady-state migration, penetration, chloride ions

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