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

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LPC Bituminous Mixtures Design Guide- Type testing of bituminous mixtures -Table 3 – Indicative minimum characteristics of coarse aggregates :Mechanical strength and production characteristicsThe minimum values, as indicated in bold characters, extracted from Standard EN 13043,correspond to classifications either less than or equal to the minima transposed from the formerFrench aggregate standards. The italic values correspond to the French application of aggregatestandards as described in XP P 18-545.Type of useLower base layerUpper Base layerMechanical strengthEN 13043XP P 18-545LA 40 M DE 35LA 40 M DE35(1)LA 30 M DE 25LA 30 M DE 25(1)Production characteristicsG C 85/20G 25/15FI 25 f 1G C 85/20G 25/15FI 25 f 1Thick binder layer(≥ 5cm)Thin binder layer (AC-BBM)Thick surface course andlightweight airfield pavementsThin surface course (BBTMand Porous Asphalt PA-BBDr)and heavy airfield pavementsLA 30 M DE 25LA 30 M DE 25(1)G C 85/20G 20/15FI 25 f 1LA 25 M DE 20G C 85/20LA 25 M DE 20 (1) G 20/15FI 25 f 1LA 25 M DE 20PSV M DE 50LA 25 M DE 20(1)LA 20 MDE15PSV 50(2)LA 20 M DE15(1)G C 85/20G 20/15FI 25 f 1G C 85/15 (gap-graded grading)G C 85/20G 20/15FI 20 f 0,5(1)With any potential application, when justified and given an explicit justification within the materials contract documents, amaximum compensation of 5 points between the LA and MDE characteristics (see XP P 18-545). For example:⎯ an aggregate with LA = 25 is deemed compliant with [LA 20 , M DE 15] if it exhibits an MDE value of 10⎯ an aggregate with M DE = 20 is deemed compliant with [LA 20 , M DE 15] if it exhibits an LA value of 15⎯ an aggregate with M DE = 18 is deemed compliant with [LA 20 , M DE 15] if it exhibits an LA value of 17(2)For a number of unique points, it becomes necessary to predict the PSV 53 (declared) value, or even the PSV 56 value.2.1.4.2 Particle size distributionFor coarse aggregates, the usual grading fractions are: 2/4, 2/6, 4/6, 4/10, 6/10and 10/14.For mixes intended in applications as road base, the fractions 2/10, 6/14, 6/20, 10/20and 14/20 may also be used.The possible D values for each type of mixture are displayed in Table 4.- 46 -
LPC Bituminous Mixtures Design Guide- Type testing of bituminous mixtures -Standard EN 13043 imposes using the base series + series 2 sieve or the baseseries + series 1 sieve. It is common practice to opt for the base series + series 2sieve.Table 4 – Accepted values of D vs. type of mixtureAsphalt mixAsphalt concrete for surface and binder course(AC-BBSG)High modulus asphalt concrete for surface andbinder course (AC-BBME)Asphalt concrete for surface and binder coursefor airfield (AC-BBA)Thin layer asphalt concrete A or B type(AC-BBM type A or B)Graves-bitume (Asphalt concrete for base)(AC-GB)High modulus asphalt concrete for base course(AC-EME)Thin layer asphalt concrete C type( AC-BBM type C)Very thin layer asphalt concrete (BBTM), Porousasphalt (PA-BBDr)D, expressed in mm10 - 1414 - 20 (2)10 - 14 - 20 (2)106 - 10 (1)(1)(2)It is possible to use the 8-mm sieve (European standard).It is possible to use the 16-mm sieve (European standard).The type A thin layer asphalt concretes (AC-BBM type A) are characterized by adiscontinuity between 2 and 6 mm, while the type B (AC-BBM type B) arecharacterized by a discontinuity between 4 and 6 mm. The type C (AC-BBM type C)mix designs are of a continuous grading.2.1.4.3 AngularityThe angularity of coarse aggregates exerts a sizable impact on the surface coursewith respect to texture, which is why this characteristic must always be taken intoaccount for mixes designed with this purpose.The angularity of coarse aggregates is measured in accordance with StandardEN 933-5 guidelines. The aggregates derived from crushed rock are considered to liein category C 100/0 .Coarse aggregates from alluvial deposit extraction for use on surface courses mustbe of category C 95/1 . For some “soft” asphalt concretes types (AC-BBS) submitted tolow traffic levels, coarse aggregates of category C 50/10 could also be employed.2.1.5 Specifications regarding additivesNo distinct specification has been incorporated into the standards.- 47 -
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6. LPC Bituminous Mixtures Design Guide, Sept 2007. - Aapaq.org

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