Surface Condition Effects on Critical Chloride Threshold of Steel Reinforcement

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Title: Surface Condition Effects on Critical Chloride Threshold of Steel Reinforcement

Author(s): Radhakrishna G. Pillai and David Trejo

Publication: Materials Journal

Volume: 102

Issue: 2

Appears on pages(s): 103-109

Keywords: corrosion; mill scale; steel reinforcement

Date: 3/1/2005

Abstract:
To evaluate the influence of the steel reinforcement surface condition on the corrosion performance, the critical chloride threshold values of five uncoated steel reinforcement types (ASTM A 706, ASTM A 615, microcomposite, stainless steel 304, and stainless steel [SS] 316LN) with as-received and polished surface conditions were quantitatively determined using the accelerated chloride threshold (ACT) test procedure. Micrographs of the surfaces for all steel reinforcement types were obtained using both optical and scanning electron microscopy (SEM). This qualitative assessment was correlated with critical chloride threshold values. This study indicated that the mean critical chloride threshold values increased with the complete removal of the as-received surface and with surface polishing for the ASTM A 706, microcomposite, and stainless steel 304 reinforcements and decreased with the complete removal of the as-received surface and with surface polishing of the ASTM A 615 and SS316LN steels.