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Excavator Mixing


Erie Lake, PA: Soil Stabilization by In Situ Soil Mixing, PSI Material Stabilization

soil-excavator-mixing-erie-pa

The PSI area of this site was the location of previous industrial operations at least one of which resulted in a large deposit of silica fume dust throughout the near surface soils at the project site.

The development design required stabilization of the silica fume dust because of the tendency of the silica fume dust to liquefy under vibration. The future site development, a parking lot and load transfer area needed to be stable enough to hold large trucks, equipment, and loads for the nearby Hardinger Transfer facility. Geo-Solutions' expertise in the field of soil stabilization was key to stabilizing the silica fume dust to facilitate future site development.

Soil mixing was completed using bucket mixing (see photo above). Two excavators, one for pre-excavation and one for mixing, were able to stabilize 500 - 700 CYs / 10 hour shift.

Field personnel utilized a grout blend consisting of Erie, PA municipal water and Portland cement to stabilize the silica fume dust and site soils. The cement acted to bind and strengthen the mixed materials.

soil-excavator-mixing-erie-pa

Geo-Solutions was responsible for overall quality control of the stabilization activities which included process controls to ensure accurate reagent addition as well as laboratory testing on field collected samples of the mixed materials.

This project was successfully completed having met all of our client's expectations, as well on schedule and within budget.

Project Objective

  • Stabilize the silica fume dust to allow future development of the property

Description of Work

  • Stabilized approximately 8,500 cubic yards of silica impacted soils.
  • Portland cement was utilized as a stabilizing reagent.
  • Performed in-house bench scale treatability study.

Project Challenges

  • Fast track schedule for completion due to approaching winter weather and development milestones



 
   

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