Bitumen and foaming properties. October 15, NABin 2013, Grand Hotel Oslo, Helene Odelius, Nynas AB

Transcription

1 Bitumen and foaming properties October 15, NABin 2013, Grand Hotel Oslo, Helene Odelius, Nynas AB

2 Content Bitumen foaming; why, when and how? Foaming characterisation of binders Laboratory asphalt evaluation with foamed bitumen Some aspects of asphalt production and paving when using foamed bitumen Conclusion 2 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

3 Why foaming? Improved working environment because of the decrease in temperature Lowering temperature with 10 C gives approximately 50% less bitumen fumes (EAPA, 2005) Less exposure to particles at lower temperatures Lower energy consumption Lower CO 2 -emissions Less binder aging during asphalt production Less NOx emissions have been observed 3 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

4 When is foaming of bitumen used? Soil Stabilization In situ recycling of base courses Half warm (< C) asphalt production using bitumen foam and wet aggregate Warm (>100 C) asphalt production using bitumen foam and dry aggregate December 2011-June 2012, Processing of foundation material contaminated by coal and mineral residue in the port of Antwerp, Belgium 4 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

5 How does foaming of bitumen work? 5 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

6 Foaming characteristics of binders Foaming characteristics of bitumen binders changes with Bitumen source and manufacturing Added water content Foaming temperature PMB harder to foam than Penetration bitumen 6 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

7 Expansion ratio and half life Expansion ratio The ratio of the maximum volume of the foamed bitumen to the initial volume of the liquid bitumen A high expansion ratio will make coating of aggregates easier and faster Half life The time (in seconds) needed by the foam to halve its expansion volume A high half life means that the foam is more stable, also improves the coating of the aggregates 7 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

8 Equipment for binder foaming characterisation Foaming characterisation of binders conducted by Henrik Arnerdal, Bitumen Technology Nordic, Nynäshamn, Sweden and Geert Lemoine, Nynas Competence Center Antwerp, Belgium 8 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

9 Influence of bitumen source Binders A-D fulfil the European Norm for 70/100 in EN and the PMB fulfils the 75/ specification of EN NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

10 Difference in half life between binders 10 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

11 Influence of binder temperature 11 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

12 Laboratory asphalt evaluation with foamed bitumen Foamed bitumen collapses rapidly The foam need to be mixed with aggregates immediately Optimum water content in foam need to be established Water content in aggregates need to be controlled (half warm applications) Can influence water sensitivity Curing will effect compaction 12 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

13 Coating of aggregates Binder X Binder Y Binder Y Binder X 5% water 4% water 5% water 4% water Binder X Binder X Binder Y Binder Y 5% water 4% water 5% water 4% water Source: European Union founded SCORE Superior Cold Recycling project 13 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

14 Mixing and paving with foamed bitumen Foamed bitumen collapses rapidly Workability at lower temperature remains in asphalt mix Water sensitivity Adhesion agents Less short term aging due to the lower production temperature August 2009, New surface course, Årsunda, Sweden, NCC Roads AB, Green Asphalt 14 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

15 Summary Foaming characteristics of binder are influenced by Bitumen source and manufacturing Added water content Foaming temperature Foaming characteristics effect coating of aggregates Water sensitivity needs to be considered when using foamed bitumen Foamed bitumen can be used also in half warm applications with wet aggregate 15 NABin 2013, Bitumen and Foaming properies, Helene Odelius, Nynas AB, Bitumen Technology Nordic

16 Nynas AS Tollbugata 39B NO-3044 Drammen Norge Tel Fax Nynas AB Bitumen Technology Nordic SE Nynäshamn Sweden Tel Fax Emulsionsmarknaden 2013, Shadi Tentak 16-Oct-13