Probabilistic life cycle analysis of alternative reinforcement products in the design of concrete structures - Phase One: Laboratory Durability Testing

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In Canada, bridges are exposed to harsh weather conditions. Such conditions result not only in deterioration ofthe concrete but mainly lead to corrosion of the steel rebar. Deterioration of aging bridge structures represents agrowing issue. Significant part of the issue is due to corrosion of the internal reinforcement. In Canadianenvironment, the rate of corrosion of the internal reinforcement in bridge structures is a function of severalparameters such as temperature, i.e., cycles of freezing and thawing, level of humidity and direct exposure towater, presence of de-icing salts, sustained and repetitive loads, and time. Due these factors, concrete loses itsability to protect the internal reinforcement. Unprotected reinforcement starts to corrode sooner thananticipated and, therefore, reduces the bridge service life. To avoid shortening of the service life, and safe costof maintenance, several types of advanced corrosion resistant reinforcing materials have been developed.In this research, performance and durability testing is proposed on several types of corrosion resistantreinforcing rebars including Fibre Reinforced Polymer (FRP) (Glass FRP, Carbon FRP and Basalt FRP),Martensitic Micro-composite Formable Steel (MMFX), and Stainless steel, in addition to the conventionaluncoated steel for comparison purposes. The reinforcing bars will be embedded in concrete specimensrepresenting a bridge parapet. These reinforced concrete specimens will be exposed to severe weatherconditions including spraying water and cycles of freezing and thawing then tested for ultimate capacity afterthe exposure. The study will evaluate material performance in terms of strength, durability, section loss of therebar, ductility, and cracking patterns to not only establish reference guidelines for the industry but mainlybroaden the fundamental knowledge about the behavioral patterns of selected materials in harsh environments.It is expected that the different types of rebars will influence the response of the concrete beams when loaded.As an outcome of the study, a report will be prepared summarizing how the application of the selectedmaterials can extend the service life and reduce the maintenance cost of structures exposed to harsh weather.