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Evaluation of Dynamic Modulus of HMA Sigmoidal Prediction Models and Optimization by Approach of U.S. Mesh Sieve by AFNOR and LC Mesh Sieve

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Document pages: 18 pages

Abstract: Pavement design tools are not universal. Indeed, in the sizing ofpavements in the USA, the prediction models used in the calculation of thedynamic modulus of HMA are not adapted to the characterization of the mineralskeleton of the HMA mix designed with the French method. This article aims to assess thepredictive models of the dynamic modulus used in the mechanistic-empiricaldesign for their use in the design of bituminous pavements, and to develop newpredictive models taking into account the sieve series LC and AFNOR standards.A total of six types of mixtures were subjected to the determination of complexmodulus testing by direct tensile-compression on cylindrical specimens (26-700LC) over a temperature range (5) and frequency (5) data. Dynamic modulusprediction models |E*| are studiedWitczak model 1999 and model Witczak 2006. These models do not take intoaccount the AFNOR or LC mesh sieve, an approach was made in relation to the USmesh sieve to replace ρ200 (0.075 mm), ρ4 (4.76 mm), ρ38 (9.5 mm) and ρ34 (19 mm) respectively bythe AFNOR mesh P0.08 (0.08mm), R5 (5 mm), R10 (10 mm) and R14 (14 mm). The result isthe production of two models whose are evaluated by correlation with the values|E*| of modulus measured in the laboratory issatisfactory (R2 = 0.83respectively R2 = 0.71 and p-value = 0.00). The optimization ofthese approximate models gave new models with the same frame as the originalmodels and a better correlation with the data observed in the laboratory(respectively R2 = 0. 95and R2 = 0.91 p-value = 0.00).

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