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Towards a Viscoelastic Model for Phase Separation in Polymer Modified Bitumen
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Structural Engineering and Bridges. (Highway Engineering Research Group)ORCID iD: 0000-0003-1779-1710
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, a review is given on the most popular polymers used today for polymer modification of bitumen. Furthermore, the development of a model for phase separation in polymer modified bitumen (PMB) is proposed, that will enable a better control and understanding of PMB phase behaviour, allowing thus to enhanced long-term performance. PMB is hereby considered as a blend and focus is placed on its structure, its equilibrium thermodynamics and its phase separation dynamics. The effects of dynamic asymmetry on phase separation in PMB are analysed with related theories and some image data. Based on the discussion in this thesis, it is concluded that the effects of dynamic asymmetry between bitumen and polymer should be taken into consideration when studying phase separation in PMB. By analysing related literature and image data, it is found that some features of viscoelastic phase separation are shown during the phase separation process in some PMBs. It is therefore possible and useful to develop a viscoelastic model for PMB to describe its phase separation behaviour. In this, the stress-diffusion coupling is expected to play a key role in the model. Finally, recommendations are made towards the future research which is needed to realize the proposed model.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. , v, 26 p.
Series
TRITA-BKN. Bulletin, ISSN 1103-4270 ; 130
Keyword [en]
Polymer modified bitumen; storage stability; viscoelastic phase separation; PMB model
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
URN: urn:nbn:se:kth:diva-163540ISBN: 978-91-7595-503-2 (print)OAI: oai:DiVA.org:kth-163540DiVA: diva2:800709
Presentation
2015-04-20, B1, Brinellvägen 23, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20150409

Available from: 2015-04-09 Created: 2015-04-07 Last updated: 2015-04-09Bibliographically approved
List of papers
1. Polymer modification of bitumen: Advances and challenges
Open this publication in new window or tab >>Polymer modification of bitumen: Advances and challenges
2014 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 54, no 1, 18-38 p.Article, review/survey (Refereed) Published
Abstract [en]

Advances and challenges in the field of bitumen polymer modification for road construction during the last 40 years are reviewed in this paper. The history of bitumen polymer modification is described chronologically. Some popular plastomers and thermoplastic elastomers in bitumen modification are discussed regarding their advantages and disadvantages, including polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), ethylene-butyl acrylate (EBA), styrene-butadiene-styrene (SBS), styrene-isoprene-styrene (SIS) and styrene-ethylene/butylene-styrene (SEBS). Although these polymers all improve bitumen properties to some extent, there are still some drawbacks limiting the future development of bitumen polymer modification, such as high cost, low ageing resistance and poor storage stability of polymer modified bitumen (PMB). Researchers attempted various ways to remove these drawbacks. Some technical developments for removing drawbacks are reviewed in this paper, including saturation, sulfur vulcanization, adding antioxidants, using hydrophobic clay minerals, functionalization and application of reactive polymers. The future development of polymers for bitumen modification is analyzed as well. Since it is currently challenging to perfectly achieve all expected PMB properties at the same time, some compromised recommendations are given in this paper, among which greatly enhancing the properties with an acceptably high cost, significantly reducing the cost with relatively poor properties and their combinations. Functionalization is emphasized as a promising way to enhance the properties of currently used polymers and develop new-type polymer modifiers with much greater success in the future. It is also recommended that future research on bitumen polymer modification focuses more on function development towards enhancing: adhesion with aggregates, long-term performance and recyclability.

Place, publisher, year, edition, pages
Elsevier, 2014
Keyword
Advance, Challenge, Future development, Polymer modified bitumen
National Category
Infrastructure Engineering Polymer Technologies
Research subject
Transport Science
Identifiers
urn:nbn:se:kth:diva-144175 (URN)10.1016/j.eurpolymj.2014.02.005 (DOI)000336111000003 ()2-s2.0-84898809979 (Scopus ID)
Note

QC 20140612

Available from: 2014-04-11 Created: 2014-04-10 Last updated: 2017-12-05Bibliographically approved
2. Towards the development of a viscoelastic model for phase separation in polymer-modified bitumen
Open this publication in new window or tab >>Towards the development of a viscoelastic model for phase separation in polymer-modified bitumen
2015 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 16, no S1, 39-49 p.Article in journal (Refereed) Published
Abstract [en]

The development of a viscoelastic model for phase separation in polymer-modified bitumen (PMB) is proposed in this paper. PMB is considered as a pseudo-binary blend. Equilibrium thermodynamics and phase separation dynamics of PMB are discussed. The effects of dynamic asymmetry on phase separation in PMB are analysed with related theories and some image data. Based on the discussion in this paper, it is concluded that the effects of dynamic asymmetry between bitumen and polymer should be taken into consideration when studying phase separation in PMB. By analysing related literature and image data, it is found that some features of viscoelastic phase separation are shown during the phase separation process in some PMBs. It is possible to develop a viscoelastic model for PMB to describe its phase separation behaviour. The stress-diffusion coupling would play a key role in the model by introducing composition-dependant mobility, shear and bulk stress.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2015
Keyword
polymer modified bitumen, storage stability, viscoelastic phase separation, model
National Category
Infrastructure Engineering
Research subject
Civil and Architectural Engineering
Identifiers
urn:nbn:se:kth:diva-163539 (URN)10.1080/14680629.2015.1030834 (DOI)000355122400004 ()2-s2.0-84929953979 (Scopus ID)
Note

QC 20150616

Available from: 2015-04-07 Created: 2015-04-07 Last updated: 2017-12-04Bibliographically approved

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