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

LPC Bituminous Mixtures Design Guide– General remarks –The distribution of voids within the mix, figure 17, allows to distinguishinterconnecting voids whose geometry enables associating two faces of a pavementor of a sample . This type of void is sought in the case of porous asphalts. Thegeometric complexity of such voids, with respect to the possibility of internal fluidflow, is called "tortuousity".Non-connecting voids open onto one face yet are blocked at the other end. Duringmeasurement of the bulk density, depending on the method employed, they may betaken into account or not, or perhaps only in part, within the volume selected for thecomputation.Occluded voids are not accessible.ConnectingVoidsNon connectingvoidsOccluded voidsFigure 17: Connecting, non-connecting and occluded voidsMaximum densityThe maximum density may be directly determined on the mix according toStandard EN 12697-5 using Method A with water, in which case it getsdenoted MVR.It may be calculated from component mass densities obtained by means of variousmethods (water, solvent, paraffin oil) and would then be denoted MVRc, based onthe following formulas:MVRc =Aggregate mass + Bitumen massVg + VbCase of an external binder content TL ext :MVRc =%Gρ1g1100+TLext%G2%G+ + .... +ρg2 ρgnnTL+ρbextCase of an internal binder content tl int :MVRc =%Gρ1g1%G+ρ2g 2100%G+ .... +ρgnntlint+ρb- 37 -