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

LPC Bituminous Mixtures Design Guide- Mix Design Procedure -3 MIX DESIGN PROCEDUREThe procedure employed to design material mixes has not been codified. The focusherein relies upon meeting the requirements identified from the type testing stagedescribed in Part 2. The mix design process begins by selecting the set ofcomponents: aggregates, fines, binder, and additives. In some instances, thesecomponents may be imposed by the contracting party. Knowing the characteristics ofmix constituents is critical as of the initial mix design phase and will also prove usefulfor all subsequent mix adjustments/refinements should test results not comply withspecifications. The procedure entails adjusting the mix composition using theGyratory Compactor test, complemented afterwards by the set of tests stipulated forthe particular testing level in correspondence with the chosen design. This procedurehas been laid out in the diagram below. The sections that follow will detail thesevarious stages in association with the recommendations issued by practitioners.Change incomponent(s)Selection of componentsDesign of theprototype mix compositionAdjustments of theparticle grading curveGyratory CompactortestyesnoType testing3.1 Component selection3.1.1 Aggregates3.1.1.1 Fines and added fillersAccording EN 13043, fines and added fillers are characterized after a dry sieving witha 0,125 mm sieve by a voids of dry compaction test (Rigden Void Index), by a ∆T R&Btest and by the identification of the methylene blue value MBF.- 73 -