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1 Introduction and Research Approach
Pages 1-9

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From page 1...
... Mechanistic based design methods use layered theories to predict pavement response. Good relationships have been found to exist between flexible pavement performance and the stresses, strains, and displacements calculated by lavered pavement theories using appropriate resilient moduli for the layers.
From page 2...
... In the repeated load test, instead of applying a single slow loading, a series of load pulses are applied that are separated by a distinct rest period as shown in Figure 3a. The repeated load test concept can be incorporated into many conventional static types of tests such as the diametral, biaxial, beam bending and simple shear tests.
From page 3...
... Measured vertical stress pulse applied to the subgrade due to a slowly moving vehicle - 23 in. thick pavement (after reference 1 )
From page 4...
... Therefore, to select design resilient moduli the representative stress state acting upon each layer must be either known or assumed. The complete stress state consists of the combined effect of the initial residual stresses existing abler construction and the dynamic stresses caused by traffic loading.
From page 5...
... Repeated load and cyclic loading wave forms (after reference 3 ~ VEH1CI-E aonoe ~nos ~ ~T10N ~llm tIlll1 /~/_ //~% I/~_ /~y '% 1' %`O1 q' I q.
From page 6...
... 4. Compare and analyze field determined moduli using common nondestructive devices with moduli determined using validated test procedures.
From page 7...
... REPORT ORGANIZATION Chapter 2 describes diametral tests performed on asphalt concrete specimens and presents and discusses the results. Chapter 3 summarizes the findings of repeated load biaxial tests performed on granular bases, lime stabilized granular materials and subgrade soils.
From page 8...
... Laboratory Resilient Modulus Testing Resilient Modulus Testing . AC | Base | Subgrade · ~ \ 1 / Limited Round Robin Testing .
From page 9...
... Appendix H summarizes~e multi-Laboratory validation study, and Appendix ~ compares laboratory measured resilient moduli with moduli back-calculated from FWD tests performed in the field.


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