8Koch G H, Brongers M P H, Thompson N G, et al. Corrosion Cost and Preventive Strategies in the United States [ C ]. Dunblin, Ohio : CC Technologies, 2001: 22- 24.
9Ottosen, N S. Failure and Elasticity of Concrete, Dan Atom Energy Comm Res Establ[ C]. Ris Eng Dept Ris - M - 1801, Roskilde, Den- mark, 1975.