01090647

Component

Pavement subgrade characterizations in terms of resilient modulus (MR) and other physical properties are essential for pavement design. Researchers have suggested that MR of subgrade soil is related with soil properties, water content, and weather conditions. In this study, three experimental stages were conducted to develop the MR prediction model for both of the stabilized soils: first the changes of MR along with curing time, then the effect of saturation change on the MR and finally the effect of dry-wet cycles. Based on the laboratory and on site test resultsCa synthesized model was developed to predict the MR of stabilized soils with curing time, moisture(initial saturation and saturation), and dry-wet cycles. The predicted values were close to the laboratory results and the former were consistently higher. The natural water content of the undisturbed subgrade soil was much higher than the optimum water content so the subgrade couldnft meet the design requirements before proper treatments. Both the lime-cement treatment and the lime treatment on wet and soft subgrade soils were effective, and the former performed better than the latter, which was also verified by the test roads. The majority of the strength increase of stabilized soils happens in early stages (60 days) and the strength of laboratory specimen is usually higher than that of on site stabilized soils. The proposed model was applied to predict the MR of the lime and the lime-cement stabilized soils used in highway subgrade with the on site input parameters. Because of the different curing condition between the laboratory and the site, an effective way to reduce the amount of prediction error is to calibrate and validate the prediction model with on site testing data or apply a shift factor.

01084478

08-2188

English

10

2008

Transportation Research Board 87th Annual Meeting

DVD

Figures (3) ; References (16) ; Tables (3)

Calcium oxide; Highways; Lime cement; Modulus of resilience; Moisture content; Soil mechanics; Soil stabilization; Stabilized materials; Subgrade (Pavements)

Geotechnology; Highways; I42: Soil Mechanics

Transportation Research Board Annual Meeting 2008 Paper #08-2188

TRIS, TRB

Jan 29 2008 4:32PM