SOIL STABILIZATION. INVESTIGATIONS OF A CHEMICALLY MODIFIED QUICKLIME AS A STABILIZING MATERIAL.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Laboratory tests showed that a system of 4 quicklime plus 1 magnesium sulfate, by dry soil weight, was capable of increasing the unconfined compressive strength of several clay soils from 20 to well over 100 psi, thereby exceeding minimum strength criteria established for emergency mili tary road and airfield stabilization. In the laboratory the bearing strength of both a heavy clay and a lean clay, representing the field-test soils, was increased from an initial CBR of 4 to values generally exceeding 50 within 24 hr, with no loss in strength evident upon soaking. In the field, two 9-in.-thick stabilized-soil layers were constructed on a 4-CBR subgrade using a heavy clay and a lean clay soil, both treated with the 4 quicklime-1 magneisum sulfate combination. The performance of these soil surfaces under applied traffic loads showed that sufficient strength was developed within one day after con struction to withstand minimum traffic require ments for emergency military road andor airfield operations. To determine the treated soils water resistance, water was ponded on an untrafficked lane of both stabilized-soil layers for several days, after which traffic was applied. The treated lean clay retained sufficient strength to sustain traffic, but the treated heavy clay did not.