| Abstract: |
During a freezing event, pore solution in cementitious bodies expands and creates stresses that can cause damage; therefore, reducing the number of freeze/thaw cycles experienced by a structure will extend the structure’s service life. The incorporation of phase change materials (PCMs) as a way to reduce the number of freeze/thaw cycles experienced by bridge decks has been investigated by modeling and mechanical testing, calorimetry, and x-ray microtomography. Models identified regions where freeze/thaw damage is not a significant concern, as well as two regions where this technology may be practical, increasing the service life of a bridge deck by at least one year. The incorporation of PCM reduces strength by varying amounts, and for varying reasons, depending on which PCM is used and how it is introduced into the concrete. As a variety of methods exist to address this loss in strength, PCM incorporation is a promising technique for addressing one aspect of the impending infrastructure crisis in the United States. |
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