Main Report on Results of Comparative Site Monitoring

• The objective of WP 2 is to analyse the potential use of reclaimed asphalt (RA) in new asphalt surface layer mixes and particularly the use of modified binders. Therefore the chemical compatibility of new binders with old bitumen in RA and the physical performance of the resulting binder and asphalt mixes have been examined separately to develop mix-design guidelines to ensure a long service life of asphalt mixes with reclaimed asphalt.In new bituminous bound courses, especially in base asphalt layers, the use of up to 40 % of RA is state of the art in most of the European countries. In surface layers, RA is currently used in relatively small amounts (10 to 20 %) if at all, because the demands on the properties of surface courses are very high. Surface courses need good deformation resistance at high temperatures as well as a high resistance against top-down cracks at low temperature and good skid resistance. The aggregates and binder used in surface courses are therefore of premium quality.The objective of WP 2 is to analyse the potential use of reclaimed asphalt (RA) in new asphalt surface layer mixes including the use of penetration grade and polymer modified binders (PmB’s). In lower asphalt layers (e.g. bituminous base courses) the use of high quantities of RA is common in most European countries. In surface course layers this occurs less frequently due to the high demands on the surface course.Incorporation of RA into asphalt layers can reduce the demand for added binder to the new mixture, depending on the residual binder content and recovered binder properties of the RA. Using RA in new asphalt mixtures has the potential to reduce costs and reduce energy requirements through reduced demand for raw materials and reduced transport of raw materials. This report covers the performance RA sites monitored which include both plant mixed RA sites (with and without polymer modified binder); and in situ hot recycling sites. The performance of sites is compared with control sections where no RA has been used.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Samhällsbyggnadsteknik -- Infrastrukturteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Civil Engineering -- Infrastructure Engineering (hsv//eng)

Nyckelord

Recycling (mater)

Bituminous mixture

Surfacing course

Polymer modified bitumen

Mixing plant

In situ

51 Road: Bituminous materials and binders

51 Road: Bituminous materials and binders

Publikations- och innehållstyp

vet (ämneskategori)

rap (ämneskategori)