Bitumen modifiers for reduced temperature asphalts: A comparative analysis between three polymeric and non-polymeric additives

Abstract This study presents three bitumen modifiers which may find successful application in the fabrication of binders for warm mix asphalt in the paving industry. In that sense, two non-polymeric additives, thiourea and thiourea dioxide, along with a reactive isocyanate-terminated prepolymer have been evaluated. Viscous flow and linear viscoelasticity tests, at 60 °C, reveal bituminous modified binders which evolve towards highly viscous materials when subjected to ambient curing. However, at 135 °C, they show lower viscosity than a typical 3 wt.% SBS binder used as reference. These results suggest modified binders with low viscosity which may contribute to reduce the mix asphalt temperature. On the contrary, they are expected to undergo an important increase in viscosity when the asphalt is in-service, which would contribute to improve further their performance. Low temperature performance and effects of short-term and long-term aging were not considered in this study.

[1]  E. Windhab.  Fluid Immobilization – A Structure-Related Key Mechanism for the Viscous Flow Behavior of Concentrated Suspension Systems , 2000 .

[2]  Qun-fang Lei,et al.  Thermogravimetric analysis of petroleum asphaltenes along with estimation of average chemical structure by nuclear magnetic resonance spectroscopy , 2005 .

[3]  Joel Oliveira,et al.  Optimization of warm mix asphalts using different blends of binders and synthetic paraffin wax contents , 2010 .

[4]  P. Partal,et al.  End-performance evaluation of thiourea-modified bituminous binders through viscous flow and linear viscoelasticy testing , 2013, Rheologica Acta.

[5]  T. McNally,et al.  Blends of Bitumen with Polymers having a Styrene Component , 2001 .

[6]  Ali Akbar Yousefi,et al.  Polyethylene dispersions in bitumen: The effects of the polymer structural parameters , 2003 .

[7]  M. Gupta,et al.  Evaluation of TDI production waste as a modifier for bituminous waterproofing , 2004 .

[8]  F. Martínez-Boza,et al.  Bituminous polyurethane foams for building applications: Influence of bitumen hardness , 2012 .

[9]  Jiri Stastna,et al.  Thermomechanical Properties of Several Polymer Modified Asphalts , 2000 .

[10]  D. M. Segura,et al.  Chapter 3 Chemistry of polyurethane adhesives and sealants , 2005 .

[11]  S. Cimmino,et al.  Viscoelastic properties and morphological characteristics of polymer‐modified bitumen blends , 2010 .

[12]  Pedro Partal,et al.  Thermo-rheological behaviour and storage stability of ground tire rubber-modified bitumens , 2004 .

[13]  C. Gallegos,et al.  Influence of Processing Temperature on the Modification Route and Rheological Properties of Thiourea Dioxide-Modified Bitumen , 2011 .

[14]  M. Bousmina,et al.  Polymer blends for enhanced asphalt binders , 1996 .

[15]  V. Castaño,et al.  Rheological properties of styrene-butadiene copolymer–reinforced asphalt , 1996 .

[16]  J. Planche,et al.  A structure‐related model to describe asphalt linear viscoelasticity , 1996 .

[17]  D. Lesueur.  The colloidal structure of bitumen: consequences on the rheology and on the mechanisms of bitumen modification. , 2009, Advances in colloid and interface science.

[18]  Jichang Wang,et al.  Thermodynamic analysis of decomposition of thiourea and thiourea oxides. , 2005, The journal of physical chemistry. B.

[19]  M. Bousmina,et al.  Comparing the effect of corona treatment and block copolymer addition on rheological properties of polystyrene/polyethylene blends , 1995 .

[20]  F. Martínez-Boza,et al.  Influence of Temperature and Composition on the Linear Viscoelastic Properties of Synthetic Binders , 2000 .

[21]  Moisés García-Morales,et al.  Viscous properties and microstructure of recycled eva modified bitumen , 2004 .

[22]  B. Singh,et al.  Use of isocyanate production waste in the preparation of improved waterproofing bitumen , 2003 .

[23]  Ulf Isacsson,et al.  Modification of road bitumens with thermoplastic polymers , 2000 .

[24]  D. Khakhar,et al.  Hydraulic resistance of rigid polyurethane foams. III. Effect of variation of the concentration of catalysts on foam structure and properties , 2004 .

[25]  R. Woodhams,et al.  Asphalt-polyolefin emulsion breakdown , 1991 .

[26]  G. Airey.  Rheological properties of styrene butadiene styrene polymer modified road bitumens , 2003 .

[27]  P. Redelius.  Solubility parameters and bitumen , 2000 .

[28]  J. Kent Newman,et al.  Dynamic Shear Rheological Properties of Polymer-Modified Asphalt Binders , 1998 .

[29]  C. Gallegos,et al.  Effect of processing on the rheological properties of poly-urethane/urea bituminous products , 2010 .