Solutions – Cellular Grouting
Service – Annular Space Grouting
The Job
This annular space grouting project is part of the City of Atlanta’s Sugar Creek project. It involves replacing and upsizing aging sewer infrastructure southeast of downtown Atlanta. The tunnel is 84 inch diameter, roughly 1500 linear feet, and carries a 48 inch sanitary line. The volume of the annulus is around 1400 cubic yards.
Generating and placing 200CY/hour of CJFill-UL.
The Challenge
This tunnel required complete grouting of the annular space. The tunneling contractor was very concerned about:
- carrier pipe buoyancy during grouting, the
- volume of material needed, and the
- placement length.
On shorter, smaller tunnels, they generally self-perform annular grouting with ready mix, without problems. However for this tunnel, they identified cellular grout as being significantly lower risk, and also cost due to the scale.
The Solution
CJGeo proposed 30lb/cuft CJFill-UL cellular grout, made with onsite dry batch equipment. This allows pours up to 200CY/hour, has very low pumping pressures, and does not depend on ready mix trucks. CJGeo sent a plant and crew to the site, and over three days mixed and placed 1400 cubic yards of cellular grout. The 30lb/cuft material exceeded the 150psi strength requirement. Carrier pipe buoyancy was addressed with water fill.
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Facing a challenge similar to this Sugar Creek annular space grouting project?
