6. LPC Bituminous Mixtures Design Guide, Sept 2007. - Aapaq.org

LPC Bituminous Mixtures Design Guide- Mix Design Procedure -The stiffness modulus values generated using this method may deviate fromexperimental values by a factor of 2.Shell method: Estimation of the bitumen modulus (Péné + TBA); computation of themix modulus based on granular compacity and loading time or frequency).The standard modulus calculation formula is given by:Sm⎡= S⎣2,5Cvb ⎢1 + × , in MPa.n 1−Cv⎥ ⎦⎤n−44×10Vgn = 0.83lg and C v=SbVg + VbThis relation is applicable to highly compact mixes (≅ 3% voids).' 100 × CvFor other asphalt mixes, C v is replaced by Cv=100 + v − 3with v = percentage of voids.Francken's method: The elastic modulus E ∞ is calculated (for low temperature andhigh frequency values):The complex modulusmodulus R * " function:E ∞ = 1,436×104⎛Vg⎞× ⎜ ⎟⎝ Vb ⎠0,55Vg: aggregate volume in the mix,Vb: binder volume in the mix,v: percentage of residual voids in the mix.−2( −5,81×10× e), in MPA*E is proportional to the elastic modulus via the "reducedE**= R xE∞R * depends on the bitumen consistency at a given temperature and frequency, asVgexpressed by G* and the ratio on the following graph:Vb- 120 -