RJC’s engineers set national standards for structural repairs, durability and protection. We contributed to the CSA S478 Guidelines on Durability in Buildings, and our engineers advise municipalities and industry associations.
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Extend Production Life with Structural Restoration
Ammonium Nitrate Prill Tower, Redwater, AB
The Agrium Prill Tower was constructed in 1968. The 125-foot high, 30-foot diameter reinforced concrete silo structure is used in the production of ammonium nitrate fertilizer products.
The aggressive environment, and years of contamination from liquid ammonium nitrate, caused expansion and softening of the weakened cement matrix resulting in severe concrete deterioration.
The combination of concrete deterioration and corrosion of the reinforcing steel eventually led to a significant reduction in the load-carrying capacity of the concrete structure. The facility either had to undergo significant structural repairs or be demolished.
In 2009, a structural repair program was developed by RJC to provide an additional 15-years of service life for the severely deteriorated, 41-year-old reinforced concrete structure.
The repair program included removal of the existing eight-inch thick concrete walls in selected areas, followed by the construction of new reinforced concrete ribs at intervals along the tower perimeter. The removal and replacements were performed in several phases to permit the tower structure to remain safely supported and intact during repairs.
The 2009 repair phase is now complete, with the remaining structural repairs scheduled for completion in 2010.
Quick facts
- Engineered by RJC's Edmonton Building Science and Restoration teams
- RJC devised a digital model of the deteriorated tower and this allowed for normal plant operations during restoration