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Abstract:The presence of unstable cohesive soils is a constant problem in highway construction in Louisiana. An intimate mixture of soil and lime has been proven effective in improving the quality of these soils and lending stability to them. Economic considerations, however, make mixing of the soil and lime, by conventional methods, to the depths required for embankment stability, impractical by conventional methods.
In order to test methods for in-place stabilization the Department, in cooperation with the Federal Highway Administration, Bureau of Public Roads, initiated a study of (1) movement of lime by electro-osmosis, (2) injection of lime slurry from a high-pressure nozzle forced into the ground by hydraulic pressure and (3) the placement of lime in previously drilled holes.
Neither the electro-osmosis nor the drill lime method effected any measurable improvement in soil characteristics. Of the three methods the pressure-injection method is the most effective. However, this method, as presently used, does not distribute the lime satisfactorily throughout the soil. Modification in equipment or technique could possibly make this process workable. However, economic considerations would probably limit the process to maintenance use unless a considerable lowering of the overall cost can be made.
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