Adoption of Highly Workable Concrete to Construction of Asukayama Tunnel

Construction of Upper Slab of Tunnel Culvert Structure Close to Pipe Roofing and Quality Control of Concrete

Abstract

We are now constructing Asukayama Tunnel in Central Circular Oji Root of Metroporitan Expressway. The upper slab of tunnel culvert structure, which is constructed under the crossing of trunk roads by means of Pipe Roofing Method, is very close to Pipe Roofing, and has too many steel materials as obstacles to place and fill with concrete. So we've decided to adopt Highly Workable Concrete to perform a perfect filling in slab. This report describes about an outline of construction, how to design mix proportion and some results of quality control of concrete.