Projekt BVFF - publicerade   BVFF nummer:  2018:2-21 Projekttitel  Bitumen selection protocol to minimize shear-related distresses of asphalt pavement Projektledare/Kontaktperson  Jiqing Zhu Telefon  013-20 42 56 Utförarorganisation  VTI Medutförare  Nynas AB KTH Peab Asfalt AB (in discussion) Bakgrund  As roads age and experience repeated loading from the traffic, the pavement condition degrades and distresses begin to accumulate. This has become a big challenge globally, as the road infrastructure renewal usually costs a lot. Since asphalt is the predominant material used for road surface, it would make great sense to study how to proactively minimize the distress potential of asphalt pavement beforehand, for example, as early as in the design stage of road construction, maintenance and renewal. This proposed project aims to minimize shear-related distresses of asphalt pavement, for example, rutting issues and shear fatigue failures, by developing an effective, efficient and reliable protocol for bitumen selection. Sammanfattning  Shear failure of asphalt mixture is the cause for many pavement distresses, for example, rutting and shear fatigue issues. To minimize the shear-related distresses of asphalt pavement, this proposed project aims to develop an effective, efficient and reliable protocol for bitumen selection. The shear-related behaviour of bitumen, asphalt mastic and asphalt mixture will be experimentally investigated. Their permanent deformation potential, viscosity and shear fatigue behaviour will be characterized. Based on the obtained data, the bitumen-mastic-mixture correlation will be analysed. A prediction model for the effect of used bitumen on the asphalt mixture will be the outcome. Its reliability will be evaluated as a tool for bitumen selection. Förväntat resultat  The primary deliverable of this proposed project is an effective, efficient and reliable protocol for bitumen selection with defined scope of application. It is based on the rheological characterization and prediction of bitumen’s influence on asphalt mixture, to ensure the reduced shear-related distresses of asphalt pavement. This can assist the industry contractors in selecting the right bitumen for more durable asphalt pavement and the relevant authorities in specifying technical requirements and verifying design and production formulas. Another main outcome from this proposed project is a prediction model for the effect of selected bitumen on the shear-related distresses potential of asphalt pavement. The model will be integrated into the PEDRO model, which will contribute to enhancing the predictability of transport quality from selected materials via the resulted road performance. Meanwhile, the model will help enable more reliable life-cycle cost analysis and thus contribute to the improved cost-effectiveness of roads from the life-cycle perspective. Plan för resultatspridning och implementering  In order to spread the project results and seek for implementation, the following plan is made: - Project meetings and seminars with partners, reference group (TrV, contractors, material suppliers etc.) and international experts will be held on a regular basis, for the purpose of implementation. - The project outcomes will be integrated into the PEDRO model as a tool openly accessible at the VTI website. - The results will be published as peer-reviewed scientific articles, conference contributions and project reports. All the publications will be openly archived in the database DiVA (Digitala vetenskapliga arkivet). Tidsramar  2018-10-01 till 2020-12-31