Evaluation of Solidification/Stabilization for Treating Contaminates Soils from the Frontier Hard Chrome Site

Solidificationstabilization SS of chromium in contaminated soils has proven to be one of the more intractable problems in applying SS technology. This is particularly true when attempting to reduce the mobility of the chromium VI ion. The evaluation problem is compounded by the availability of numerous proprietary SS mixes. This paper describes a study in which eight formulations were evaluated for their ability to reduce the mobility of chromium III an chromium VI. The physical and contaminant release properties of a generic formulation and formulations provided by seven vendors were evaluated in a rigidly controlled study conducted at the US Army Engineer Waterways Experiment Station. The suite of physical tests included unconfined compressive strength, wetdry durability, permeability, moisture content, Atterberg limits, Proctor density, bulk density, specific gravity, slump, cracking, bleed water, and resistance to penetration. MWEP, Permeability, Solidification,