Soil Fill Applications
An illustration of real-world examples of the problem-solving merits of Norlite Geotechnical Fill.
Earth Retaining Structures:
Earth Retaining Structures
Design of the Capital Center Project in Providence, Rhode Island included a pile-supported 35' high cantilever retaining wall adjacent to the Providence River. The weight of the proposed structure, including the backfill soil, would significantly increase loads on the underlying soft silt. The designers wanted to avoid triggering a deep-seated failure of an old bulkhead along the river bank.
Engineers specified over 10,000 cubic yards of Norlite Lightweight Aggregate for placement behind the cantilever wall. Because of its light weight, Norlite reduced the loads on the foundation soils and behind the retaining wall, and increased the safety factor against deep-seated failure to acceptable levels.
In another application, 5,500 cubic yards of Norlite maintained stability of an existing bulkhead along Long Wharf in Boston.
MBTA's renovations to a railway bed in Natick, Massachusetts required increasing the bridge clearance. This would involve raising both abutments and adjacent elevation. The increased lateral loads and overturning moments could have damaged the bridge's old masonry abutments.
Norlite Lightweight Aggregate was used to both raise the adjoining area to the desired elevation and to replace some of the heavier existing backfill. Because Norlite aggregate is lighter than natural soils, it maintained the same lateral loads and overturning moments behind the abutments.
Soft Ground Improvements
The underlying soils at the Vermont Cheese Factory warehouse in Hinesburg, Vermont consisted of soft clay and peat. Engineers wanted to avoid structurally damaging differential settlements between the existing warehouse and a proposed new addition
Several feet of existing soft soils were replaced with Norlite Lightweight Aggregate. Because the aggregate weighs only half as much as the existing soil, Norlite reduced the total foundation load of the new structure and kept differential settlements well within tolerable limits.
Engineers have used Norlite in soil replacement techniques for many years on a variety of structures, including the Massachusetts Institute of Technology Arts and Media Facility
A 12" utility line in the town of New London, Connecticut had to be placed across a swampy, twoacre site. Settlement in the soft organic soils induced by the trench backfill could damage the pipe.
Norlite Lightweight Aggregate was used to solve several problems. The aggregate limited the amount of ground settlement to levels that the utility line could safely tolerate and its light weight reduced loads on the pipe. In addition, the aggregate's thermal insulating properties provided protection from freezing.
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