Abstract
Recently, there has been growing interest in the use of precast concrete elements in bridge decks and superstructures because of their potentially improved durability and dimensional stability as compared with cast-in-place concrete. However, field grouting of connections can lead to comparatively lesser performance by the connections than by the precast components. These connections can also pose a long-term maintenance and serviceability problem for the structure as a whole. So-called nonshrink grouts are often used in construction projects that engage prefabricated elements. Current standard methods partially limit the volumetric changes of the nonshrink grouts; however, the requirements do not necessarily address the shrinkage and expansion behaviors that are relevant to field-cast connection construction. This lack of guidance raises some questions on the appropriate use of these grouts in this application. In this study, the volume stability and cracking potential of two commercially available nonshrink grouts with different water-to-solid ratios were investigated. Results show that nonshrink grouts may exhibit shrinkage both at early ages and in the hardened state. This result shows that cracking may occur, and this cracking can potentially reduce the service life of structures composed of precast concrete elements.
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