The Job
This Virginia load reducing fill project by CJGeo is located at the Hampton Roads Bridge Tunnel. As part of the HRBT expansion project, VDOT's largest project ever, Turner is constructing a new Traffic Operations Center on the North Island. The North Island is on the Hampton end of the new tunnels, which run parallel to the two existing tunnels.
CJGeo batching equipment onsite.
The Challenge
The North Island is an incredibly congested artificial island on the Hampton end of the Hampton Roads Bridge Tunnel. The Traffic Operations Center will be the new operational headquarters for VDOT's ITS system for Hampton Roads and the expanded HRBT. The new TOC can't increase loads on the underlying structures. The designers determined that the most efficient approach would be to undercut the building footprint, pour a mat slab and install perimeter walls, then fill inside with 30lb/cuft cellular concrete.
The Solution
CJGeo pouring cellular grout into the mat slab.
The original design was for 70lb/cuft cellular concrete. CJGeo suggested using 30lb/cuft material to reduce logistics risks, costs & time on site. After evaluating potential buoyancy due to the lightweight fill being lighter than water, the EOR accepted the proposed change.
CJGeo mobilized a single dry batch cellular concrete plant to the site. By using bulk cement, CJGeo was able to batch and place 700 cubic yards per day of material. Because CJFill-UL is self-consolidating, this significantly cut down on labor.
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