SUBGRADE STABILIZATION WITH PORTLAND CEMENT AND HYDRATED LIME UNDER MODIFIED T11 LANDING MAT.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
Pagination or Media Count:
Sections of a low-strength subgrade 4 to 7 CBR were treated with portland cement and hydrated lime to assist in maintaining the strength of the sensitive clayey-silt soil during inclement weather and to develop information on the relative merits of selected methods for stabilizing the subgrade. It was determined that both portland cement and hydrated lime, applied as 3 percent admixtures, were effective in improving the resistance of the sensitive subgrade soil to loss in bearing capacity during wetweather operations, the benefits resulting primarily from modification of the soil plasticity rather than any significant strength increase mechanism. The technique of applying hydrated lime by alternating layers of lime with layers of soil did not result in any determinable benefit, although some diffusion of lime was indicated. The use of polyethylene sheeting as a membrane under landing mat was of doubtful value because of its inability to withstand mat embedment without damage. Recommendations are made to consider the use of admixed cement or lime, the choice depending on the particular soil and problem, in future landing mat test operations were bearing capacity of the subgrade needs to be preserved.
- Terminal Flight Facilities
- Soil Mechanics