Abstract
The cast in place ultra-high-performance fiber reinforced concrete (herein after, UHPFRC) basically does not contain the coarse aggregates so that behaves high fluidity immediately after mixing.
In order to apply the cast in place type UHPFRC to reinforcing concrete bridge deck with a thin UHPFRC overlay, it is necessary to examine not only the composition of UHPFRC itself, but also the construction method in detail such as surface treatment to ensure bonding between the concrete deck and the UHPFRC layer, the specifications of the construction machine, and the curing method. In this study, the suitable composition of UHPFRC for the overlay method was found from the laboratory test results. The UHPFRC was placed with a 40mm thick layer on the cement concrete slab to simulate an overlay on concrete bridge deck and evaluate the workability on the site and the adhesion of the UHPFRC layer with the underneath concrete slab. The results indicated that a good adhesion performance could be secured with the suitable composition of UHPFRC and the wet or adhesive surface treatment of the concrete slab.
