Abstract

Kajima Corporation and NEXCO Central started a joint research and development (R&D) project to develop a method for improving existing RC void slab bridges using cast-in-situ UHPFRC in 2016 and as the final investigation of the R&D project a full-scale construction test was conducted. This paper is the first one of the two papers dealing with the construction test. UHPFRC mix used in the construction test is called AFt-UHPFRC because it is characterised by its matrix densified by controlled ettringite (AFt) formation. UHPFRC was produced in a batching plant built in a testing field of that production capacity is 3.0 m3 per hour. A slab-on-ground (SOG) structure modelling top part of RC void slab bridge decks was built in the testing field and UHPFRC was cast on top of the SOG structures where UHPFRC was transported and placed by a wheel loader and spread/compacted/finished by newly developed construction equipment.

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