BS EN 13108-3:2006 pdf download – Bituminous mixtures — Material specifications — Part 3: Soft Asphalt
4 Requirements for constituent materials
4.1 General Only constituent materials with established suitability shall be used. The establishment of suitability shall result from one or more of the following:
European Standard;
European Technical Approval;
specifications for materials based on a demonstrable history of satisfactory use in asphalt. Evidence shall be provided on their suitability. This evidence may be based on research combined with evidence from practice. NOTE In the European asphalt industry it is common practice to use additives like inorganic or organic fibres, pigments, waxes etc., which are not covered by a European Standard or ETA. This European Standard allows the use of those materials.
4.2 Binder
4.2.1 General The binder shall be paving grade bitumen or a modified bitumen. The paving grade bitumen shall conform to EN 12591 and the modified bitumen to EN 14023.
4.2.2 Selection of binder The grade of the bitumen, the type and grade of modified bitumen shall be as specified. In case of a paving grade bitumen the grade shall be selected from the grades between 250/330 and 650/900 or V1 500 and V12 000 inclusively.
NOTE 1 Given the wide variety of climates, traffic loads, used materials etc. it can be necessary to select on a regional level specific binders. When modified bitumen is used to improve properties that are not covered by the empirical specification additional proof shall be provided. This proof shall be delivered through investigation using standards in the EN 12697 series, that the modified bitumen is suitable for improving the desired functional characteristics. The proof may be based on earlier research.
NOTE 2 EN 14023 is a grading system and is only meant to characterise the modified bitumen. The modified bitumen specifications are not functionally based, and it is not possible to combine these specifications with empirical asphalt specifications to demonstrate functional behaviour. The proof required would normally be a Type Testing on a similar mixture incorporating the modified binder showing fulfilment of the relevant property. The grade of the bitumen, the type and grade of the modified bitumen may be selected
4.2.3 Surface courses with reclaimed asphalt When using more than 10 % by mass of the total mixture of reclaimed asphalt from mixtures in which mainly paving grade bitumen has been used and when the binder added to the mixture is a paving grade bitumen and the grade of the bitumen is selected, the binder shall conform to the following requirement:
Penetration, the softening point or the viscosity of the binder in the resulting mixture, calculated from the penetrations, the softening points or the viscosities of the added binder and the recovered binder from the reclaimed asphalt, shall meet the penetration, softening point or viscosity requirements of the specified grade. The calculation shall be executed according to Annex A. Either the penetration, the softening point or the viscosity requirement shall be selected.
4.2.4 Regulating courses, binder courses and bases with reclaimed asphalt When using more than 20 % by mass of the total mixture of reclaimed asphalt from mixtures in which only paving grade bitumen has been used and when the binder added to the mixture is a paving grade bitumen and the grade of the bitumen is specified, the binder shall conform to the following requirement:
Penetration, the softening point or the viscosity of the binder in the resulting mixture, calculated from the penetrations, the softening points or the viscosities of the added binder and the recovered binder from the reclaimed asphalt, shall meet the penetration, softening point or viscosity requirements of the specified grade. The calculation shall be executed according to Annex A. Either the penetration, the softening point or viscosity requirement shall be selected.