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Mortars for encapsulating sacrificial zinc anodes in reinforced concrete

✍ Scribed by Lee C. Jordan; Christopher L. Page

Publisher
John Wiley and Sons
Year
2003
Tongue
German
Weight
402 KB
Volume
54
Category
Article
ISSN
0947-5117

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✦ Synopsis

Abstract

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.

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