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<p>Recent study discovered progressing internal cracks in retrofitted reinforced concrete (RC)decks and the difficulties to secure long-term durability of the structure, creating the need to replace the entire deck with more lightweight and durable materials. Thus, Hanshin Expressway has been developing the Ultra High Performance Fiber Reinforced Concrete (UHPFRC) decks and plans to conduct experimental replacement of old decks with new decks. In the meantime, to minimize a period of road closure necessary for replacement of decks, the company has been developing a hydrodemolition technique, a technique to remove concrete with high-pressure water. Experimental introduction is planned to remove the concrete that joins steel girders and decks, while the road is still in service. This paper reports the advantages of the UHPFRC decks and hydrodemolition technique in retrofitting old concrete decks of elevated roads.</p>

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