Pavement Structural Analysis of the Design Recommendations for ...

Pavement Structural Analysis August 2004
Report No. 15953-2/1 ARA-ERES Consultants
Tensile Strain at Failure, mils/in.
100
10
1
10 100 1000 10000
Total Resilient Modulus, psi
Figure 12 Relationship between minimum tensile failure strains and indirect
tensile resilient modulus. (12)
3.5 Subsurface Drainage System
A subsurface drainage system was included in the proposed design for I-96. The
subsurface drainage system ensures that the non-frost susceptible sand subbase and soils
will not become saturated for extended periods of time. This recommendation and design
feature is based on information recovered from boring logs and reported by Michigan
DOT for the supporting soils in adjacent areas along I-96.
4. Mechanistic-Empirical Thickness Design-Evaluation Method
Two M-E analysis procedures were used to evaluate the design resulting from the
AASHTO DARWin program (refer to figure 1). One is defined as the simplistic M-E
procedure and the other is the new M-E Pavement Design Guide. Appendix C includes
the response computations for the simplistic M-E procedure, while Appendix D provides
the results of the evaualtion using the new M-E Pavement Design Guide software. This
section of the report provides a summary of the results from the simplistic and new M-E
analysis procedures.
The structural deterioration of flexible pavements is associated with cracking of the HMA
surface, and/or development of ruts in the wheel path. The methodology used in this
13