Chapter
Jun 7, 2016
Utilizing Colloidal Nano-Silica as Treatment for Concrete in Salt Water Ports: Laboratory Chloride Diffusion, Life Cycle Modeling, and the Port of Marseille Test Case
Publication: Ports 2016
Abstract
Colloidal nano-silica treatment for concrete was initially developed in the oil and gas industry to reduce the permeability of undersea well caps in the 1970s, acting as a capillary and pore-filling agent to reduce oil loss into seawater. Portland cement concrete with a high chloride diffusion rate leads to premature corrosion of reinforcing steel. Recently, colloidal nano-silica has been shown to reduce the chloride diffusion rate in conventional concrete and to reduce drying shrinkage. Laboratory testing utilizing chloride ponding and non-steady state chloride migration confirm previous work. Lifecycle corrosion modeling demonstrates the utility of colloidal nano-silica for extending the expected lifespan of concrete in saltwater ports. In addition, a test case is presented at the Port of Marseille, France, where a 70 m long boat dock was placed in 2014 with the goal of testing low shrinkage, less permeable concrete treated with colloidal nano-silica as a preamble to renovation of the 6 km sea wall that protects the harbor.
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© 2016 American Society of Civil Engineers.
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Published online: Jun 7, 2016
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Director, Civil Engineering Materials Research Laboratory, Dept. of Civil, Chemical, and General Engineering, College of Engineering and Computer Science, Univ. of Tennessee at Chattanooga, 615 McCallie Ave., Dept. 2502, Chattanooga, TN 37403. E-mail: [email protected]
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