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Title: Alkali-silica reaction and pore solution composition in mortars in sea water

The promotion of expansion of mortars containing a reactive aggregate in 1N NaCl solution at 38 C was attributed to a rise of OH{sup {minus}} ion concentration in the pore solution in the mortars. However, it is ambiguous whether the promotion of expansion of mortars in sea water at a room temperature can be explained in the same way as in NaCl solution at an elevated temperature. This study aims at pursuing the expansion behavior of mortars containing a reactive aggregate relating it to their pore solution composition and the extent of alkali-silica reaction occurring within reactive grains. The alkali-silica reaction in mortars in sea water and 0.5 1N NaCl solution at 20 C appears to progress differently from that in mortars in 1N NaCl solution at an elevated temperature of 38 C. The promotion of expansion of mortars in sea water at 20 C was found to be responsible for an effect of Cl{sup {minus}} ions in the alkali-silica reaction at early stages of immersion. Only when OH{sup {minus}} ion concentration in the pore solution was relatively high, NaCl and sea water could accelerate the alkali-silica reaction in mortars at 20 C.
Authors:
;  [1]
  1. Kanazawa Univ., Ishikawa (Japan). Dept. of Civil Engineering
Publication Date:
OSTI Identifier:
417922
Resource Type:
Journal Article
Resource Relation:
Journal Name: Cement and Concrete Research; Journal Volume: 26; Journal Issue: 12; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; MORTARS; EXPANSION; OFFSHORE PLATFORMS; MATERIALS; CHEMICAL REACTIONS; SILICA; AQUEOUS SOLUTIONS; SODIUM CHLORIDES; SEAWATER; TEMPERATURE DEPENDENCE; POROSITY; EXPERIMENTAL DATA