Temporary networks in polymer‐modified asphalts

Polacco, Giovanni; Stastna, Jiri; Vlachovicova, Zora; Biondi, Dario; Zanzotto, Ludo

doi:10.1002/pen.20246

Cited by 85 publications

(65 citation statements)

References 51 publications

(16 reference statements)

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“…The HDPE, first dispersed within the bitumen matrix, forms an interconnected three-dimensional sponge-like structure yielding a gel-type morphology. 22,24 However, after a short period of storage at high temperature (above the fusion temperature of the swollen polymer, i.e., around 120°C, see Fig. 4), the polymer network (as predicted by the rheological and optical characterization, see Figs.…”

Section: Resultsmentioning

confidence: 99%

Destabilization mechanism of polyethylene‐modified bitumen

Pérez-Lepe¹,

Martínez‐Boza²,

Attané³

et al. 2006

J of Applied Polymer Sci

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Polymer-modified binders are widely used for pavement construction. Among different polymers used to modify bitumen, polyolefins have shown to impart beneficial effects on the bitumen, especially to prevent some of the pavement shortcomings at high temperatures, such as rutting. The phase separation problems of these polymers from the bitumen may affect the final properties of the pavement. The determination of the polymer phase destabilization mechanism and rate are crucial to defer or delay the polymer separation from the matrix. With this aim, several HDPE-modified binders were manufactured by using a high-shear mixing device. The binders were stored in tubes at temperatures as high as 180°C. During the storage, the unstable polymer phase creamed up to the surface. The destabilization process was followed by means of optical microscopy observations through time, as the separation process proceeded. The segregation of the polymer phase is shown to be preceded by a coalescence mechanism. Enhanced mechanical properties have been obtained by HDPE modification. However, such binders may not be efficient for the pavement application, since phase separation may occur during the application of the binder on the road. Functionalized reactive polymers are envisaged to hinder the separation problems in bituminous binders.

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Section: Resultsmentioning

confidence: 99%

Destabilization mechanism of polyethylene‐modified bitumen

Pérez-Lepe¹,

Martínez‐Boza²,

Attané³

et al. 2006

J of Applied Polymer Sci

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“…In fact this was possible because all the analyzed materials showed to be thermo-rheologically simple thus making possible to apply the time- Asphalt is a material with very high temperature susceptibility and at a sufficiently high temperature, it starts to flow as a Newtonian fluid. The beginning of this flow can be seen on the graph of the steady shear viscosity [50]. When the master curves of dynamic material functions are available, one can estimate the beginning of the Newtonian flow from the plot of the loss compliance, J"().…”

Section: Resultsmentioning

confidence: 99%

Rheological properties of asphalt/SBS/clay blends

Polacco

Kříž

Filippi

et al. 2008

European Polymer Journal

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140

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The effect of the addition of clay as a third component in polymer modified asphalts has been investigated. After a preliminary investigation on the binary asphalt/clay and polymer/clay blends, the tertiary blends were prepared by adding the clay and polymer to the asphalt, either separately or in the form of a premixed master batch. Intercalated nanocomposites with comparable interlayer distances and glass transition temperatures were obtained in both cases. However, the results show that the mixing procedure significantly affected the final rheological properties. The master curves built in the linear viscoelastic range and represented in both the frequency and the temperature domains help to visualize and evaluate such differences. Suggested Reviewers:Dear Professor Vancso, I'm submitting the new version, revised according to referees' suggestions. I would like to thank you and the referees for helping us in improving the quality of the paper. AbstractThe effect of the addition of clay as a third component in polymer modified asphalts has been investigated. After a preliminary investigation on the binary asphalt/clay and polymer/clay blends, the tertiary blends were prepared by adding the clay and polymer to the asphalt, either separately or in the form of a premixed master batch. Intercalated nanocomposites with comparable interlayer distances and glass transition temperatures were obtained in both cases. However, the results show that the mixing procedure significantly affected the final rheological properties. The master curves built in the linear viscoelastic range and represented in both the frequency and the temperature domains help to visualize and evaluate such differences.

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“…The use of PMBs could be expected to have a resistance to traffic at least four times greater than unmodified bitumens and better performance in extreme climatic conditions [Lenoble and Nahas, 1994]. [Polacco et al, 2003[Polacco et al, , 2004. Yeh et al [2010] found that the PE PMB increases rutting resistance at high temperatures but does not significantly improve elastic resilience.…”

Section: Polymer-modified Bitumensmentioning

confidence: 99%

Modelling the linear viscoelastic rheological properties of bituminous binders

Yusoff

Shaw

Airey

2011

Construction and Building Materials

174

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Rheology involves the study and evaluation of the flow and permanent deformation of time-and temperature-dependent materials, such as bitumen, that are stressed through the application of a force. The fundamental rheological properties of bituminous materials including bitumen are normally measured using a dynamic shear rheometer (DSR), from low to high temperatures. DSR is a powerful tool to measure elastic, viscoelastic and viscous properties of binders over a wide range of temperatures and frequencies, provided the tests are conducted in the linear viscoelastic region. Therefore, the study of bitumen rheology is crucial since its reflects the overall performance of a flexible pavement. However, it is well known that the DSR also has limitations, where the measurements are exposed to compliance (testing) errors particularly at low temperatures and/or high frequencies.In addition, conducting laboratory tests are known to be laborious, time consuming and require skilled personnel. Therefore, this research is conducted to elucidate a better understanding of the rheological properties and modelling procedures of bitumens and bituminous binders.Various materials such as unmodified bitumens, polymer-modified bitumens (PMBs) and bitumen-filler mastics, unaged and aged samples, are used in this study.An extensive literature review was undertaken to identify reliable models that can be considered as a valuable alternative tool to describe or fit the rheological properties of bitumen. These properties are commonly presented in terms of complex modulus and phase angle master curves, together with the determination of shift factor values at a particular reference temperature. In general, the complex modulus and phase angle master curves can be modelled using different techniques; nomographs, mathematical equations and mechanical models. However, the nomographs have become obsolete in recent years and tended to be replaced by the two latter models.Those models are able to satisfactorily describe the rheological properties of unmodified bitumen. However, the observations suggest a lack of agreement between measured and predicted rheological properties for binders that contain a ii phase transition, such as found for highly crystalline bitumen, structured bitumen with high asphaltenes content and highly modified bitumen. An attempt was made to evaluate the validity of several mathematical equations and mechanical element approach using unaged and aged unmodified bitumens and PMBs database. I also owe a profound debt to those whose collective ideas and experiences have contributed greatly for writing the thesis: Prof. Emeritus Montgomery T. Shaw

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Temporary networks in polymer‐modified asphalts

Cited by 85 publications

References 51 publications

Destabilization mechanism of polyethylene‐modified bitumen

Destabilization mechanism of polyethylene‐modified bitumen

Rheological properties of asphalt/SBS/clay blends

Modelling the linear viscoelastic rheological properties of bituminous binders

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