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  • 1.
    Karlsson, Robert
    KTH, Superseded Departments, Civil and Architectural Engineering.
    Investigations of binder rejuvenation related to asphalt recycling2002Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    Investigations described in this doctoral thesis concernmaterial behaviour related to asphalt recycling. More indetail, the thesis describes development and application ofmethods for characterisation of the rejuvenation process, inwhich old and new binders are mixed. The thesis also includes astate-of-the-art report on asphalt recycling focusing onmaterial-related aspects.

    As the rejuvenation process involves diffusion of bituminousbinders, a method for measuring rate of diffusion based onFTIR-ATR (Fourier Transform Infrared Spectroscopy by AttenuatedTotal Reflectance) was developed. The method was employed forstudying influence of parameters such as temperature, size andshape of the diffusing molecules as well as the viscosity ofthe medium in which the diffusion takes place. Well-definedsubstances, referred to as markers, were used in some of theseinvestigations. By aid of the FTIR-ATR method, influence ofdegree of binder ageing on the rate of diffusion was analysed.Diffusion in bituminous binders was also characterised byrheological measurements. Finally, knowledge on structuralstability of recycled binders was obtained by solubilitystudies using turbidimetric titrations and three differenttitrants showing widely different solubility parameters(iso-octane, isooctanol and methyl-ethyl-ketone).

    The literature review shows that there are numerouspublications related to asphalt recycling, but fewinvestigations can be characterised as fundamental, whichillustrates the complexity of the research area. The resultspresented show, among other things, that the influence ofdegree of ageing is in principle negligible. A possibleexplanation for this behaviour could be that diffusion takesplace in the maltene phase, which is relatively unaffected byageing. The change in recorded rheological parameterscorrelated fairly well with the rates of diffusion observedusing FTIR-ATR, which indicates that chemical diffusion isaccompanied by changes in binder stiffness. Nothing in theresults presented regarding structural stability of mixtures ofold and new binder suggests that binder stability should be alimiting factor in asphalt recycling, on condition that the oldand new binder are compatible. The doctoral thesis is based onthe following papers, which will be referred to by their Romannumerals:

    I. Karlsson R., Isacsson U.“Material-Related Aspectsof Asphalt Recycling–State-of-the-art”Submittedfor publication in ASCE J of Transportation Eng.

    II. Karlsson R., Isacsson U.“Application of FTIR-ATRto Characterisation of Bitumen Rejuvenator Diffusion”Accepted for publ. in ASCE J of Materials in Civil Eng.

    III. Karlsson R., Isacsson U.“Bitumen RejuvenatorDiffusion as Influenced by Ageing”Int’l J of RoadMaterials and Pavement Design. 3(2) 2002

    IV. Karlsson R., Isacsson U.“Laboratory studies ofdiffusion in bitumen using markers”Submitted forpublication in J of Materials Science.

    V. Karlsson R., Isacsson U., Ekblad J.“RheologicalCharacterisation of Bitumen Diffusion”Submitted forpublication in J of Rheology.

    VI. Karlsson R., Isacsson U.“Bitumen StructuralStability Characterisation using Turbidimetric Titration”Submitted for publication in Energy and Fuels.

  • 2.
    Karlsson, Robert
    KTH, Superseded Departments, Infrastructure and Planning.
    Laboratory studies of bitumen rejuvenator diffusion using FTIR-ATR2000Licentiate thesis, monograph (Other scientific)
  • 3.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Edwards, Ylva
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Fogar på broar och flygfält: En lägesanalys2004Report (Other academic)
  • 4.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Application of FTIR-ATR to Characterisation of Bitumen Rejuvenator Diffusion2003In: ASCE Journal of Materials in Civil Engineering,, Vol. 15, no 2Article in journal (Refereed)
  • 5.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Bitumen Rejuvenator Diffusion as Influenced by Ageing2002In: International Journal of Road Materials and Pavement Design, Vol. 3, no 2Article in journal (Refereed)
  • 6.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Bitumen Structural Stability Characterisation using Turbidimetric Titration2003In: ACS Energy & Fuels., Vol. 17Article in journal (Refereed)
  • 7.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Investigations on bitumen rejuvenator diffusion and structural stability2003In: Journal of Asphalt Paving TechnologistsArticle in journal (Refereed)
  • 8.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Laboratory studies of diffusion in bitumen using markers2003In: Journal of Material Science, Vol. 38Article in journal (Refereed)
  • 9.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Highway and Railway Engineering (closed 20110301).
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Highway and Railway Engineering (closed 20110301).
    Material-related aspects of asphalt recycling-state-of-the-art2006In: Journal of materials in civil engineering, ISSN 0899-1561, E-ISSN 1943-5533, Vol. 18, no 1, p. 81-92Article in journal (Refereed)
    Abstract [en]

    Current knowledge on material-related aspects of asphalt recycling with focus on findings from fundamental studies is summarized. By way of introduction, a general description of different types of asphalt recycling methods is given, after which a more detailed compilation of material-related knowledge is presented. Special attention is given to the binder rejuvenation process at asphalt recycling, that is the restoration of reclaimed binder properties. Studies concerning properties of recycled mixtures are also summarized.

  • 10.
    Karlsson, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Ekblad, Jonas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Rheological characterisation of bitumen diffusion2007In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 42, no 1, p. 101-108Article in journal (Refereed)
    Abstract [en]

    Diffusion is considered important in the process of mixing old and new binders during asphalt recycling. The degree of mixing is presumed to greatly influence the final properties of recycled asphalt concrete. Previously, studies have been undertaken to investigate diffusion using FTIR-ATR (Fourier Transform Infrared Spectroscopy using Attenuated Total Reflectance). A need was identified to verify, if the rates of diffusion detected using FTIR-ATR were accompanied by changes in rheological properties. In this paper, a dynamic shear rheometer (DSR) with parallel plates is used for monitoring diffusion. Diffusion coefficients obtained at 60, 80 and 100 degrees C from tests of a soft bitumen (rejuvenator) diffusing into a stiff one are presented. The diffusion coefficients determined are compared with the corresponding diffusion coefficients obtained using FTIR-ATR. The comparison shows that the rates of diffusion detected by the DSR are of the same magnitude, but somewhat higher than the ones detected by FTIR-ATR.

  • 11.
    Lundström, Robert
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Ekblad, Jonas
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Isacsson, Ulf
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Karlsson, Robert
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering.
    Fatigue modeling as related to flexible pavement design - State of the art2007In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402, Vol. 8, no 2, p. 165-205Article, review/survey (Refereed)
    Abstract [en]

    A literature study of rheological and fatigue modeling of asphalt mixtures is presented. Theoretical aspects on structural modeling, rheological behavior and the fatigue integration in design procedures are reviewed In principle, pavement design methods can be categorized in three broad groups: empirical, semi-mechanistic and fully mechanistic methods. Pavement design is generally performed using semi-mechanistic methods comprising analytical or numerical structural response models and deterioration modeling based on transfer functions and shift factors. In the case of fatigue deterioration, several approaches have been elaborated e.g. classical models, fracture mechanics and damage mechanics. The approaches differ regarding theoretical foundation and evaluation methods used. Recognizing significant limitations concerning theoretical basis as well as lack of empirical support for current design methods, a shift in paradigm from semi-empirical methods towards more advanced fully mechanistic methods have been initiated. According to this approach, improved pavements are achieved by appropriate design methods which are capable of predicting fatigue resistance in the actual pavement environment, and thus taking into account complex stress conditions, influence of temperature and material characteristics, such as aging and healing.

  • 12.
    Melin, Anna
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Transport Studies, CTS.
    Lindberg, Gunnar
    KTH, School of Architecture and the Built Environment (ABE), Centres, Centre for Transport Studies, CTS.
    Karlsson, Robert
    KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
    Benz, T.
    Development path of Heavy Route systems: impact and socio-economic consequences. Deliverable 4.22009Report (Other academic)
  • 13. Robert, R
    et al.
    Karlsson, Robert
    KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Highway and Railway Engineering (closed 20110301).
    Oförstörande provning av tätskikts funktion på broar - Kartläggning av status och möjligheter2005Report (Other academic)
1 - 13 of 13
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