Title:
Salt Weathering of Concrete by Sodium Carbonate and Sodium Chloride
Author(s):
Harvey Haynes, Robert O’Neill, Michael Neff, and P. Kumar Mehta
Publication:
Materials Journal
Volume:
107
Issue:
3
Appears on pages(s):
258-266
Keywords:
deterioration; durability; physical salt attack; salt hydration distress; salt weathering; sodium carbonate; sodium chloride
DOI:
10.14359/51663754
Date:
5/1/2010
Abstract:
Concrete cylinders were partially submerged in 5% sodium carbonate or 5% sodium chloride solutions for up to 3.1 years. Environmental conditions were varied during the test to promote crystallization of various salts, such as thermonatrite (Na2CO3•H2O), natron (Na2CO3•10H2O), or halite (NaCl). In sodium carbonate solution, temperature and humidity cycles that, alternately, promoted the formation of thermonatrite and natron appeared to be the major cause of scaling distress at the concrete surface. Distress by sodium chloride solution was minor.