WRScompass is an industry leader in the performance of stabilization / solidification (S/S) operations, both ex situ and in situ. In fact, our key personnel have stabilized more than three million cubic yards of contaminated soils via ex situ and in situ S/S techniques.
Ex situ S/S typically is accomplished using a pugmill mixing device, although smaller projects can be completed via hoe mixing (i.e. mixing with an excavator bucket). Organic, inorganic, and metal-contaminated soils are excavated and processed through a dual-shaft pugmill to completely mix the soil with the selected stabilization reagents. Reagents, such as Portland cement, are metered into the pugmill at the desired rate to achieve stabilization of the impacted materials. Production rates using a pugmill often approach 200 tons per hour.
We also have the capability to conduct in situ S/S via various techniques, including single-auger mixing, patented rake injectors, and high-speed, rotating mixing devices. The characteristics of each project are reviewed to determine the most effective treatment method.
Single-auger mixing, or deep soil mixing (DSM), uses a crane-mounted auger system to drill into affected soils and uniformly mix the soils with cement additives. Equipment utilized for treatment primarily consists of a grout-mixing plant, a grout pump, and a mixing rig designed to encapsulate the contaminants in a monolithic solid of high structural integrity. This monolithic solid minimizes contaminant migration.
Similar results for shallow soil stabilization can be achieved through the use of rake injectors and high-speed, rotating mixing devices fitted to heavy equipment (excavators and dozers).