United States Department of Transportation
i
Durability of Precast Prestressed Concrete Piles in Marine Environment, Part 2. Volume 1 : Concrete
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2012-06-01
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[PDF-17.00 MB]
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Abstract:The overall purpose of this research was to determine methods which may be applied economically to mitigate corrosion of reinforcement in precast prestressed concrete piles in Georgia’s marine environments. The research was divided into two parts, reported in volumes 1 and 2: (1) to develop and evaluate concrete mix designs to prolong service lives of precast prestressed concrete piles in aggressive marine environments, and (2) to assess the potential of using stainless steel for prestressing reinforcement and to compare the strength and corrosion resistance of stainless steel strand to conventional prestressing strand. Studies of piles from Georgia’s coastal environment showed that the brackish waters caused both sulfate attack of the cement paste and biological attack to limestone aggregate. Use of granite aggregate, Type II cement, class F fly ash and slag are recommended. For corrosion resistance and high strength, the best, readily accessible stainless steel alloys were 2205 and 2304. Actual production of stainless steel wire and strand showed that induction heating, while the strand was under tension, increased the strand strength and lowered the relaxation from about 8% to about 2.5% for both 2205 and 2304. The presence of crevices in normal A416 prestressing strand geometry significantly increased and accelerated corrosion as compared with plain wires. Strands made with Grades 2205 and 2304 developed ultimate tensile strengths of 242 ksi and 261 ksi, respectively; but the 2304 exhibited notch sensitivity at the prestressing grips, and its use is not recommended in production at this time.
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