01043876

Component

Three drainage test sections were constructed on a segment of I-469 in northwest Indiana. As new construction, the drainage components consisted of asphalt bound open-graded (OG) drainage layer underlain by a filter layer, trench/pipe collection system and outlet. The OG drainage layer thickness varied and the filter layer included combinations of dense asphalt bound and dense unbound aggregate bases. Questions have been raised relative to use of bound and unbound OG materials in drainage layers. Of particular concerns are the stability and rutting characteristics of the OG drainage layers when subjected to truck traffic. In the study, triaxial tests were conducted on all asphalt mixtures, unbound aggregate materials and subgrades. Additional data were obtained from Falling Weight Deflectometer (FWD) tests and condition surveys. Finite element analyses (FEA) were conducted to validate pavement response to the FWD loads, examine layer shear stability in terms of shear stress and strength and compare predicted and measured rutting. The FEA using laboratory determined material properties predicted very well the FWD deflections and accumulated rutting of the three test sections. Comparisons of shear stresses and strengths indicate in general the sections are stable.

01042056

07-2911

English

14p

2007

Transportation Research Board 86th Annual Meeting

CD-ROM

Figures; Photos; References (8) ; Tables (1)

Drainage; Drainage coefficient (Pavements); Finite element method; Open graded aggregates; Pavement design; Pavement distress; Pavement layers; Pavement performance; Pavements; Rutting; Subgrade (Pavements)

Drainage layers; Unbound aggregate base layers (Pavements)

Design; Highways; Hydraulics and Hydrology; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2007 Paper #07-2911

TRIS, TRB

Feb 8 2007 7:36PM