Corrosion-free precast prestressed concrete piles made with stainless steel reinforcement : construction, test and evaluation.
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2015-03-01
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Abstract:The use of duplex high-strength stainless steel (HSSS) grade 2205 prestressing strand and
austenitic stainless steel (SS) grade 304 spiral wire reinforcement is proposed as a replacement of
conventional prestressing steel, in order to provide a 100+ year service life for prestressed
concrete piles located in the Georgia coastal region. The study experimentally investigated 16-in.
square, 70-ft. long piles constructed using duplex HSSS 2205 strands and SS 304 spiral wire
reinforcement and compared their behavior with identical piles which were built using the
conventional strands and spirals. The piles were successfully driven to refusal without visible
damage, were extracted and tested in flexure and shear.
Transfer and development length of piles using duplex HSSS 2205 strands were 57% and
55%, respectively, of the values predicted by AASHTO LRFD (2013). Transfer length of duplex
HSSS 2205 strands was not affected by pile driving and extraction. Flexural and shear strength of
piles using duplex HSSS 2205 strands were greater than predicted by ACI 318-11 and AASHTO
LRFD (2013) specifications. Experimental prestress losses at 335 days for piles using duplex
HSSS 2205 strands were 82% of the predicted losses by AASHTO LRFD refined method.
Prestress losses were not affected by pile driving and extraction.
It was concluded that duplex HSSS 2205 can be used for prestressing strands in combination
with austenitic SS 304 for the transverse confinement and shear reinforcement for prestressed
concrete piles, using the same design requirements and construction procedures used for
conventional prestressing strand and wire reinforcement
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