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Title |
Electrochemical Studies on the Corrosion Performance of Steel Embeded in Activated Fly Ash Blended Concrete
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Authors |
송하원 ; 이창홍 ; 이근주 ; 벨루사라스와티 |
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Keywords |
철근부식 ; 플라이애쉬 ; 활성화 ; 활성화된 플라이애쉬 시멘트 ; 부식 저항성 ; 전기화학적 연구 reinforcement corrosion ; fly ash activation ; activated fly ash cement ; corrosion resistance ; electrochemical studies |
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Abstract |
The use of fly ash to replace a portion of cement has resulted significant savings in the cost of cement production. Fly ash blended cement concretes require a longer curing time and their early strength is low when compared to ordinary Portland cement(OPC) concrete. By adopting various activation techniques such as physical, thermal and chemical method, hydration of fly ash blended cement concrete was accelerated and thereby improved the corrosion-resistance of concrete. Concrete specimens prepared with 10-40% of activated fly ash replacement were evaluated for their open circuit potential measurements, weight loss measurements, impedance measurements, linear polarization measurements, water absorption test, rapid chloride ion penetration test and scanning electron microscopy (SEM) test and the results were compared with those for OPC concrete without fly ash. All the studies confirmed that up to a critical level of 20-30% replacement; activated fly ash cement improved the corrosion-resistance properties of concrete. It was also confirmed that the chemical activation of fly ash better results than the other methods of activation investigated in this study.
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