Research and Application of UHPFRC Panels and UHPFRC Composite Panels in Japan
Steel plates and concrete panels have been widely used in the early highway bridges in Japan,however the fatigue cracking of steel plates and the aging of concrete panels are critical issues as the ages of these bridges increase.The ultra-high-performance fiber-reinforced concrete(UHPFRC)panels and UHPFRC composite panels that own high strength and sound durability are proposed.There are flat and Waffle-shaped UHPFRC panels,which can be used to replace the deck system of existing road bridges and serve as deck panels for under-construction bridges.When the precast PC panels are overlaid with a UHPFRC layer,the original deck system transforms to be a composite system,where the UHPFRC layer also acts as a waterproof layer,sparing the paving of a traditional waterproof layer and improving the construction efficiency.The UHPFRC panels and UHPFRC composite panels are fabricated off site and delivered to bridge site for installation,to ease construction.The application of UHPFRC panels and UHPFRC composite panels can improve the durability of bridge structures and reduce future maintenance demands and costs.The engineering practices in Japan include the Tamade Rampway Bridge of Hanshin Expressway,Shinanobashi Rampway Bridge of Hanshin Expressway,and Miyagi Shiroshigawa Bridge of Tohoku Expressway.
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