In this paper an attempt has been made to study the effects of stress corrosion cracking (SCC) phenomena in high strength steel, typical of those used as tensioning tendons in prestressed concrete, in several corrosive environments. Chlorides and sulphates present in the concrete affect corrosion of prestressed strand which in turn influence long term performance of the structure. As a part of the experimental work, stress bench of 21ft. length was prepared with two end-bearing plates each having 18 numbers of holes of 5mm diameter which allow the strand of 4 mm diameter to pass through it. The three different sets (each set having six numbers of strands) of stressed strands are kept in acrylic buckets of three different corrosive environments like Sodium Chloride (NaCI), Ammonium Thiocyanate (NH4SCN), Sodium Sulphate (Na2SO4) with their respective concentration recommended by FIP (Federation International de la Prestressing). Effects and changes in surface of strands are studied by keeping the stressed strands in wet and dry cycle of 36 hrs. for 45 days. Stressed strands in different corrosive environment show different rate of loss in its cross sections based on its severity. For further detailed investigation, Scanning Electron Microscopy (SEM) images and EDS for chemical analysis turned out to be very helpful to observe clear changes in loss of few significant metals in particular sample of strand before and after the test performed.
|專業出版物||Indian Concrete Journal|
|出版狀態||Published - 2015 5月 1|
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