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Mortars for encapsulating sacrificial zinc anodes in reinforced concrete
Author(s) -
Jordan Lee C.,
Page Christopher L.
Publication year - 2003
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200390088
Subject(s) - mortar , lithium hydroxide , materials science , sodium hydroxide , alkali–aggregate reaction , alkalinity , hydroxide , zinc , alkali–silica reaction , molar concentration , lithium (medication) , aggregate (composite) , alkali metal , portland cement , corrosion , cathodic protection , galvanic anode , galvanic cell , anode , composite material , metallurgy , cement , inorganic chemistry , chemistry , electrode , organic chemistry , ion , medicine , ion exchange , endocrinology
Expansion measurements, chemical analysis and petrography have been undertaken to assess a possible side‐effect of using strongly alkaline additives (lithium hydroxide or sodium hydroxide) in encapsulating mortars used to promote the activity of sacrificial zinc anodes employed for galvanic cathodic protection of steel in concrete. Very high concentrations of lithium hydroxide in the encapsulating mortars were found to cause no deleterious expansion associated with alkali‐silica reaction (ASR) in surrounding “model” concrete specimens even when the latter contained aggregate of known susceptibility to ASR and a near‐threshold level of intrinsic alkalinity. Encapsulating mortars formulated with an equivalent molarity of sodium hydroxide, however, were found to induce significant expansion due to ASR in similar specimens.