01044053

Component

Excessive water retained in the base, subbase, and subgrade can cause early distress to asphalt pavement. A subsurface drainage system, incorporating permeable base and edgedrains, has been used for facilitating water removal from the pavement. Cement-treated permeable base material offers high resilient modulus and high permeability; however, its ability to provide drainage effectiveness and to preserve stiffness with freeze/thaw action needs to be evaluated. In this paper, resilient modulus of cement-treated base materials is measured for specimens subjected to different cycles of freeze/thaw conditioning. A reduction factor of 0.55 is recommended for taking into account of freeze/thaw effect on the resilient modulus. Field monitoring results of moisture and frost depth at an instrumentation site are used to evaluate the EICM (Enhanced Integrated Climatic Modeling) prediction. Although moisture content was successfully predicted by EICM, the frost depth penetration prediction was poor. Finally, a FEM program SEEP/W was used to perform unsaturated, transient analysis to compute the “time to drain” of the as-built cement-treated permeable base. The numerical simulation techniques allow for a realistic estimation of the time to drain, thus confirming the drainage effectiveness of the cement-treated base materials.

01042056

07-3463

English

25p

2007

Transportation Research Board 86th Annual Meeting

CD-ROM

Figures (11) ; References (12) ; Tables (3)

Asphalt pavements; Edge drains; Field tests; Finite element method; Freeze thaw durability; Laboratory tests; Modulus of resilience; Moisture content; Permeability coefficient; Subbase (Pavements); Subbase materials; Subgrade (Pavements); Subsurface drainage

Cement treated bases; Permeable pavements

Geotechnology; Highways; Pavements; I42: Soil Mechanics

Transportation Research Board Annual Meeting 2007 Paper #07-3463

TRIS, TRB

Feb 8 2007 8:09PM