Abstract
The prevention of corrosion in reinforced concrete structures can be achieved by different means. The aim of this paper is to present the efficiency of corrosion prevention using silane hydrophobic impregnation, through laboratory investigations as well from long term field studies. The laboratory investigation was carried out in Zürich, is based on modified ASTM C109, where the product was applied on cracked concrete beams (before cracking and before corrosion initiation; after cracking and before corrosion initiation and finally after cracking and after corrosion initiation). The long term field studies were carried out over 12-years exposure to de-icing salts in a Swiss tunnel, and after 10 years exposure to a marine zone simulation in Japan. This paper will show that the use of a silane hydrophobic impregnation can be an effective way to reduce the risk of corrosion for concrete structures, including structures exposed to chlorides in a marine environment, or from the use of de-icing salts in winter time.
Highlights
The recent disastrous collapse of the Genova Bridge in Italy and different investigations in various countries have shown that the state of bridges in many countries is critical i.e. in need of urgent renovation works.The cost of corrosion [1] is well documented by various different organizations including NACE in the USA and the World Corrosion Organization
Swiss Laboratory Investigations Only the macrocell measurements are presented in this paper
When the treatment is carried out once corrosion is already advanced, we can see a positive effect from the relative drying-out of the specimens on reducing corrosion activities – this is further confirmed by independent tests carried out by ZAG (Slovenian National Building & Civil Engineering Institute) [11]
Summary
The recent disastrous collapse of the Genova Bridge in Italy and different investigations in various countries have shown that the state of bridges in many countries is critical i.e. in need of urgent renovation works.The cost of corrosion [1] is well documented by various different organizations including NACE in the USA and the World Corrosion Organization. It is estimated that a quarter of the world’s annual steel production is destroyed by corrosion every year. This is equivalent to 150 million tons per year (equivalent to 5 tons/second). The W.C.O. estimates the cost of corrosion as being between 3.1 to 3.5% of a nation’s GDP annually for industrialized countries (e.g. between €1.3 and 1.4 trillion in USA). As these figures reveal this corrosion is very costly for society and financially
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