In current accelerated bridge construction, grouted sleeve connections are widely used to connect bridge substructures, such as prefabricated piers and abutments. Grouting material age is the main factor affecting the mechanical properties of the sleeve connections, which in turn affects the efficiency of the accelerated bridge construction. On the basis of varyingly aged grout specimens, this article presented an experimental test regarding the influence of grout age on the mechanical properties of grouted sleeve connections. The specimens were loaded on the universal testing machine, and their interior failure mode was analyzed using industrial Computed Tomography (CT) detecting technology, which is a method of examing structures by scanning X rays. The results revealed that the bearing capacity of the 1-day-old grouted sleeve connection can reach the yield strength of the connection bar. After 14 days, the sleeve’s connection strength remained basically stabilized. Moreover, the failure of bonding interface between the bar and the grouting material mainly occurred in grouted sleeve connections. Based on the measured load–displacement data before the bar yield, model parameters related to grout age and the stress-slip model of the bonding interface between bar and the grouting material are presented, which can guide the mechanical analysis and the design of grouted sleeve connections.
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