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09206 Performance of Corrosion Resistant Reinforcements in Concrete Test Specimens and Application of Results to Service Life Projection

Product Number: 51300-09206-SG
ISBN: 09206 2009 CP
Author: William Hartt, Richard J. Kessler and Rodney G. Powers
Publication Date: 2009
Industry: Highways & Bridges
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Corrosion resistant reinforcements (CRR) have been studied increasingly over the past decade as alternatives to black bar and epoxy-coated reinforcement for concrete bridges and other structures exposed to chlorides. The present paper reports results of experiments where three different concrete specimen configurations reinforced with a series of CRR, as well as black bar, underwent long-term chloride exposure. Alloys studied were 3Cr12 (UNS-S41003), 2101LDX (ASTM A955-98), 2304 (UNS-S32304), and 316L (UNS S31603) stainless steels, two 316 stainless steel clad black bar products, MMFX-2 (ASTM A1035), and black bar (ASTM A615). Time-tocorrosion initiation, Ti, and the critical [Cl-] to initiate corrosion, CT, were determined, with the distributed nature of these two parameters, as opposed to their having a discrete value, being emphasized. Results are expressed in terms of the extent to which Ti and CT exceeded that for black bar. The effect of concrete quality upon CRR performance is discussed, and an example life-cycle analysis that compares Ti for CRR compared to black bar is provided.

Key words: Corrosion resistant reinforcement, concrete, stainless steel, MMFX-2, chlorides, time-to-corrosion, chloride threshold, service life projection
Corrosion resistant reinforcements (CRR) have been studied increasingly over the past decade as alternatives to black bar and epoxy-coated reinforcement for concrete bridges and other structures exposed to chlorides. The present paper reports results of experiments where three different concrete specimen configurations reinforced with a series of CRR, as well as black bar, underwent long-term chloride exposure. Alloys studied were 3Cr12 (UNS-S41003), 2101LDX (ASTM A955-98), 2304 (UNS-S32304), and 316L (UNS S31603) stainless steels, two 316 stainless steel clad black bar products, MMFX-2 (ASTM A1035), and black bar (ASTM A615). Time-tocorrosion initiation, Ti, and the critical [Cl-] to initiate corrosion, CT, were determined, with the distributed nature of these two parameters, as opposed to their having a discrete value, being emphasized. Results are expressed in terms of the extent to which Ti and CT exceeded that for black bar. The effect of concrete quality upon CRR performance is discussed, and an example life-cycle analysis that compares Ti for CRR compared to black bar is provided.

Key words: Corrosion resistant reinforcement, concrete, stainless steel, MMFX-2, chlorides, time-to-corrosion, chloride threshold, service life projection
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