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

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LPC Bituminous Mixtures Design Guide- Type testing of bituminous mixtures -The 0/4 and 0/6 all-in aggregates are of category G A 85 (passing 100% at 2D, 98-100% at 1,4D, and 85-99% at D).The tolerances applied to the particle size distribution of both fine and coarseaggregate must respect the specifications associated with category G TC 10 (±5% at D,±10% at D/2, ±3% at 0,063 mm).The harmfulness of fine and coarse aggregate must be either MB F 10 (as measuredon the fines from fine aggregate) or MB 2 (as measured on the 0/2 particle sizes)which is considered more severe than MB F10.The fines content from fine aggregate generally lies between 12% and 22%. Fineaggregates from category f 16 or f 22 can also be used, but in all cases, the finescontent from fine aggregate must be specified through a declared value.The minimum angularity of fine aggregates (EN 933-6) is determined when themixture is intended for surface courses. In general, this would apply to the categoriesE CS 35 or 38, except in the case of “soft “ asphalt concrete AC-BBS (asphalt concreteused on flexible pavements with low traffic loads), for which E CS 30 is accepted.For the other asphalt mixtures (used for the binder or base courses), angularity is notspecified in the case where a wheel tracking test has been called for in the typetesting protocol.Limiting the inclusion rate to just 10% of fine aggregate with round particles (declaredE CS < 30) is accepted for the asphalt concrete for surface and binder course ( “BétonBitumineux Semi Grenu” AC-BBSG), asphalt concrete for airfields (Béton Bitumineuxaéronautique – AC-BBA), “soft” asphalt concrete (Béton Bitumineux Souple AC-BBS)and High modulus asphalt concrete for surface and binder course (Béton Bitumineuxà module élevé – AC-BBME) categories.For asphalt concretes, a maximum value of fine aggregate friability (EN 932-3) is setat 40 for a 0/4 and at 45 for a 0/2. These specifications are not included any more inthe product standards, however, they may be relevant and then can be verified.2.1.4 Specifications regarding coarse aggregates2.1.4.1 Physical requirements (Mechanical strength) and productioncharacteristicsBoth the minimum mechanical strength values and minimum productioncharacteristics of coarse aggregates depend upon the position of the layer for whichthe mix is being designed as well as its thickness for surface courses.Production characteristics deal with grading, shape and fines content.Concerning the grading characteristics, the category G C 85/20 [passing to D sievebetween 85 % and 99 %, passing to d sieve between 0 % and 20 %, 100 % to 2 Dsieve, 0 % to 5 % to d/2 sieve] is generally retained. For gap-graded mixtures,category G C 85/15 may be necessary [passing to d sieve between 0 % and 15 %,instead of 20 % and for single size coarse aggregate D/d, where D/d < 2, which is thecase for gap-graded mixtures used in surface course, passing to D sieve between 90% and 99 %, 100 % to 2 D sieve, 0 % to 5 % to d/2 sieve]- 44 -
LPC Bituminous Mixtures Design Guide- Type testing of bituminous mixtures -The percentage passing at mid-size sieve [D/1,4], shall be between 25 % and 80 %for base course materials, and between 20% and 70% for binder and surface coursematerials, with in both cases, a tolerance on the typical grading of ± 15 %, declaredby the producer, that means categories respectively G 25/15 and G 20/15 .The shape of coarse aggregate is determined in terms of the flakiness index FI. FI 25is the generally retained category. For very thin layers intended mixtures, categoryFI 20 may be necessary.The fines content of coarse aggregate is measured by the percentage of passing at0,063 mm sieve. Category f 1 is used [≤ 1 % at 0,063 mm sieve], for common usesand category f 0,5 for very thin layer intended materials.An overview of these characteristics is given in table 3.- 45 -
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