On the microstructure of bituminous binders

The objective of this work is to study the common features and the evolution of microstructures of bituminous binders regardless of their grade (PEN 10/20 to 160/220) and source/origin using the atomic force microscope operated in phase contrast mode. All bituminous binders show the same microstructural features, consisting of three distinct phases, the perpetua-, peri- and catana-phase. The perpetua-phase is soft and viscoelastic in nature, the peri-phase is relatively stiff and solid in nature and the catana-phase is alternatingly hard and soft in nature and is always found in the middle of the peri-phase. Experiments at different temperatures result in a quantitative picture of the changes/transitions between the different microphases upon heating. Phase formation is reversible with respect to temperature, upon heating homogenisation occurs and upon cooling re-formation of the phases can be observed.

[1]  A. Jäger,et al.  Identification of Microstructural Components of Bitumen by Means of Atomic Force Microscopy (AFM) , 2004 .

[2]  F. J. V. Nellensteyn.  Bereiding en constitutie van asphalt , 1923 .

[3]  H. Zhang,et al.  Effect of aging on morphology of organo‐montmorillonite modified bitumen by atomic force microscopy , 2011, Journal of microscopy.

[4]  Emmanuel Chailleux,et al.  Laboratory investigation of bitumen based on round robin DSC and AFM tests , 2014 .

[5]  Tom Scarpas,et al.  On the existence of wax-induced phase separation in bitumen , 2010 .

[6]  Roman Lackner,et al.  Identification of four material phases in bitumen by atomic force microscopy , 2004 .

[7]  M. Michels,et al.  The microstructure of petroleum vacuum residue films for bituminous concrete: a microscopy approach , 2011, Journal of microscopy.

[8]  L. Carbognani,et al.  Asphaltene−Paraffin Structural Interactions. Effect on Crude Oil Stability , 2001 .

[9]  J. Pfeiffer,et al.  Asphaltic Bitumen as Colloid System. , 1940 .

[10]  J. Masson,et al.  Low‐temperature bitumen stiffness and viscous paraffinic nano‐ and micro‐domains by cryogenic AFM and PDM , 2007, Journal of microscopy.

[11]  L. Loeber,et al.  New direct observations of asphalts and asphalt binders by scanning electron microscopy and atomic force microscopy , 1996 .

[12]  A. T. Pauli,et al.  Morphology of asphalts, asphalt fractions and model wax-doped asphalts studied by atomic force microscopy , 2011 .

[13]  T. Yen,et al.  Electron microscopic investigations on the nature of petroleum asphaltics , 1969 .

[14]  R. Simão,et al.  High temperature AFM study of CAP 30/45 pen grade bitumen , 2010, Journal of microscopy.

[15]  María del Carmen García.  Crude Oil Wax Crystallization. The Effect of Heavy n-Paraffins and Flocculated Asphaltenes , 2000 .

[16]  P. Claudy,et al.  CHARACTERIZATION OF ASPHALTS CEMENTS BY THERMOMICROSCOPY AND DIFFERENTIAL SCANNING CALORIMETRY: CORRELATION TO CLASSIC PHYSICAL PROPERTIES , 1992 .

[17]  J. Masson,et al.  Bitumen morphologies by phase‐detection atomic force microscopy , 2006, Journal of microscopy.