A preliminary analysis of failed prestressing strands within a post-tensioned tendon on the Wando River
bridge in South Carolina showed signs of possible hydrogen embrittlement. One proposed source of
hydrogen is through galvanic coupling that may exist between the galvanized steel duct and the steel strands. This coupling, if present, cand promote hydrogen evolution at the streel strand's surface which may or may not be mitigated by the condition and quality of the grout. To fully understand the susceptibility of post-tensioned steel strands to hydrogen embrittlement in galvanized steel tendon ducts, the conditions that promote hydrogen production, the kinetics of hydrogen evolution and adsorption into the steel, as well as the subsequent loss of strength need to be well understood.
In an effort to avoid these costly failures in the future, the likely effects of grout quality and the presence
of grout deficiencies within galvanized steel ducts will be deduced from prior knowledge of hydrogen
embrittlement mechanisms of cold-drawn steels. The focus of the review will be placed on studies and
reports that have detailed the kinetics of hydrogen production and adsorption on cold drawn steel strands,
and the relationship between stress state and hydrogen content distribution on strength reduction.