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Core Construction


Jetmore, KS: Slag-Cement-Bentonite Slurry Wall, Horsethief Reservoir

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Geo-Con was contracted to build two Cement-Bentonite slurry walls at the future Horsetheif Reservoir. The slurry walls were designed as seepage barriers under earthen dams to be built.

The two Cement-Bentonite (CB) walls were 30 inches wide and keyed into the shale material at depths ranging from 5 to 28 feet. The slurry used for excavation was a mixture of Ground Granulated Blast Furnace Slag, bentonite, and Portland cement. This slurry is self-hardening in the trench and creates the permanent, low-permeability trench backfill. The work platform was created by benching the alignment down into a deep, narrow "canyon". Because the long reach excavator used to dig the slurry wall was working from the narrow platform, the spoils from the trench were loaded directly into haul trucks for disposal.

The barrier walls were constructed using a Caterpillar 375 excavator with a long reach boom and stick combination and a 30" trenching bucket.

The specifications required a permeability of 1x10-6 cm/sec and minimum 25 psi unconfined compressive strength after 28 days. Geo-Con achieved permeability in the range of 1x10-7 to 1x10-8 cm/sec and unconfined compressive strength in the range of 100 to 200 psi using the slag-cement-bentonite mixture.

The project was completed within a narrow window in the General Contractor's schedule and was finished ahead of schedule.



 

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