Title:
Evaluation of Reinforced Concrete Masonry in a Highly Corrosive Environment
Author(s):
David J. Akers
Publication:
Symposium Paper
Volume:
122
Issue:
Appears on pages(s):
451-468
Keywords:
acids; chemical analysis; chlorides; concrete blocks; corrosion; deterioration; evaluation; grout; masonry mortars; masonry walls; reinforced masonry; reinforcing steels; warehouses; General
DOI:
10.14359/3754
Date:
6/1/1990
Abstract:
Reinforced concrete masonry structures can be effectively used in corrosive environments provided that the design is based upon a rational assessment of the exposure condition. An investigation of wall that had 6000 g of muriatic acid and 11,000 g of sodium hypochlorite stored along its exterior face indicated accelerated deterioration of the wall due to inadequate design and no protection afforded to the wall when the building's usage was changed from general warehouse to chemical storage. Poor construction practices also contributed to the distressed condition. The investigation utilized electrical, visual, and chemical means of assessing the structures's condition. The primary tool was a copper-copper sulfate (Cu-CuSO4) half cell conforming to ASTM C 876. The resulting equipotential contour map provided valuable information regarding the wall's corrosion potential. Visual observations of exposed, corroded reinforcing steel confirmed the half-cell readings. Chemical analysis of block, mortar, and grout samples extracted from the wall revealed high but inconsistent water-soluble chloride ion contents.