Effect of montmorillonite organic modification on ultraviolet aging properties of SBS modified bitumen

Abstract Montmorillonite (MMT)/SBS modified bitumen was prepared by melt blending. The microstructures of the binders were characterized by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and atomic force microscopy (AFM), respectively. The effect of MMT on ultraviolet (UV) aging properties of SBS modified bitumen was investigated. The Na + -MMT/SBS modified bitumen forms a phase separated structure, while the OMMT/SBS modified bitumen forms an intercalated structure according to FTIR and XRD analyses. AFM analysis indicates that a network structure is formed in SBS modified bitumen. The phase contrast between the dispersed domains and the matrix is decreased with the introduction of MMT. Na + -MMT shows a different influence on the SBS modified bitumen phase image, while the phase image of OMMT/SBS modified bitumen is more homogeneous. As a result of UV aging, both viscosity aging index and softening point increment of SBS modified bitumen decrease due to the introduction of Na + -MMT, which can be further reduced under the influence of OMMT. The micro-morphology of the binders becomes solid-like after UV aging, as indicated by the single phase trend of the phase images. However, these changes can be effectively prevented under the influence of MMT. Compared with Na + -MMT, the single phase trend of SBS modified bitumen can be prevented more obviously, indicating the good aging resistance of OMMT/SBS modified bitumen.

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

[2]  C. Zilg,et al.  Nanofillers based upon organophilic layered silicates , 2001 .

[3]  Virginie Mouillet,et al.  The influence of UV aging of a Styrene/Butadiene/Styrene modified bitumen: Comparison between laboratory and on site aging , 2007 .

[4]  Weiqing Zhang,et al.  Surface modification of montmorillonite and application to the preparation of polybutadiene/montmorillonite nanocomposites , 2007 .

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

[6]  G. Polacco,et al.  Effect of composition on the properties of SEBS modified asphalts , 2006 .

[7]  Jinsheng Sun,et al.  Preparation of Poly(styrene-block-acrylamide)/Organic Montmorillonite Nanocomposites via Reversible Addition-Fragmentation Chain Transfer , 2008 .

[8]  Alan J. Lesser,et al.  Effect of particle morphology on the emulsion stability and mechanical performance of polyolefin modified asphalts , 1998 .

[9]  Gaylon L. Baumgardner,et al.  Polyphosphoric acid modified asphalt: proposed mechanisms , 2005 .

[10]  Franz J. Giessibl,et al.  Advances in atomic force microscopy , 2003, cond-mat/0305119.

[11]  Yong Zhang,et al.  Improving the aging resistance of styrene-butadiene-styrene tri-block copolymer modified asphalt by addition of antioxidants , 2006 .

[12]  P. Thanki,et al.  Photodegradation and stabilization of styrene–butadiene–styrene rubber , 2000 .

[13]  Shaopeng Wu,et al.  Effect of organo-montmorillonite on aging properties of asphalt , 2009 .

[14]  Henglong Zhang,et al.  Effect of organo-montmorillonite on the morphology and aging properties of various bitumens , 2010 .

[15]  Michael L. Greenfield,et al.  Effects of Polymer Modification on Properties and Microstructure of Model Asphalt Systems , 2008 .

[16]  J. Hrachová,et al.  The effect of mechanical treatment on the structure of montmorillonite , 2007 .

[17]  Jincheng Wang,et al.  Preparation of an organomontmorillonite master batch and its application to high‐temperature‐vulcanized silicone‐rubber systems , 2008 .

[18]  M. Siddiqui,et al.  Studies on the aging behavior of the Arabian asphalts , 1999 .

[19]  Bin Li,et al.  Effect of montmorillonite on properties of styrene–butadiene–styrene copolymer modified bitumen , 2007 .

[20]  Shaopeng Wu,et al.  Influence of aging on the evolution of structure, morphology and rheology of base and SBS modified bitumen , 2009 .

[21]  Kun Xu,et al.  The Effect of MMT/Modified MMT on the Structure and Performance of the Superabsorbent Composite , 2008 .

[22]  Xiaohu Lu,et al.  EFFECT OF AGEING ON BITUMEN CHEMISTRY AND RHEOLOGY , 2002 .

[23]  Virginie Mouillet,et al.  Ageing by UV radiation of an elastomer modified bitumen , 2008 .