Rheological investigation of the influence of acrylate polymers on the modification of asphalt

Iqbal, Mohammad H.; Hussein, Ibnelwaleed A.; Wahhab, Hamad I. Al‐Abdul; Amin, Mohamed Bakr

doi:10.1002/app.24408

Cited by 39 publications

(41 citation statements)

References 39 publications

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“…Of course, in the case of EVA, there are some possibilities to increase the compatibility further, such as the use of a commercial MAH grafted EVA, as suggested by Luo and Chen [128]. With regard to acrylates, the paper by Iqbal et al [121] evaluated the storage stability of PMAs prepared using an EBA containing 27% by weight of butyl acrylate. Samples containing 4% by weight of polymer were tested after zero and 72 h of continuous mixing at 160°C and 500 rpm.…”

Section: Asphalt Interaction With Eva and Other Ethylene-based Plastomentioning

confidence: 97%

“…This led to the use of the EVA [90,[111][112][113][114][115][116][117][118][119] copolymer, which is probably the second in order of importance after SBS for asphalt modification. Similarly to EVA, other plastomers derived from copolymerization of a functionalized vinyl monomer with ethylene have been suggested and studied, including the entire class of acrylic polymers such as polyethyl acrylate (PEA), polymethyl acrylate, polybutyl acrylate (PBA), poly(ethylene-co-butyl-acrylate) (EBA), poly(ethylene-coacrylic acid) (EAA), poly(ethylene-co-methyl acrylate) (EMA), and poly(methyl methacrylate) [25,30,91,114,120,121]. EVA has ester functional groups and is available in a huge variety of commercial grades, which allows for choosing among a wide range of acetate contents (and thus degree of polarity and crystallinity) and MW.…”

Section: Asphalt Interaction With Eva and Other Ethylene-based Plastomentioning

confidence: 99%

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A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

524

184

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During the last decades, the number of vehicles per citizen as well as the traffic speed and load has dramatically increased. This sudden and somehow unplanned overloading has strongly shortened the life of pavements and increased its cost of maintenance and risks to users. In order to limit the deterioration of road networks, it is necessary to improve the quality and performance of pavements, which was achieved through the addition of a polymer to the bituminous binder. Since their introduction, polymer-modified asphalts have gained in importance during the second half of the twentieth century, and they now play a fundamental role in the field of road paving. With high-temperature and high-shear mixing with asphalt, the polymer incorporates asphalt molecules, thereby forming a swallowed network that involves the entire binder and results in a significant improvement of the viscoelastic properties in comparison with those of the unmodified binder. Such a process encounters the well-known difficulties related to the poor solubility of polymers, which limits the number of macromolecules able to not only form such a structure but also maintain it during high-temperature storage in static conditions, which may be necessary before laying the binder. Therefore, polymer-modified asphalts have been the subject of numerous studies aimed to understand and optimize their structure and storage stability, which gradually attracted polymer scientists into this field that was initially explored by civil engineers. The analytical techniques of polymer science have been applied to polymer-modified asphalts, which resulted in a good understanding of their internal structure. Nevertheless, the complexity and variability of asphalt composition rendered it nearly impossible to generalize the results and univocally predict the properties of a given polymer/asphalt pair. The aim of this paper is to review these aspects of polymer-modified asphalts. Together with a brief description of the specification and techniques proposed to quantify the storage stability, state-of-the-art knowledge about the internal structure and morphology of polymer-modified asphalts is presented. Moreover, the chemical, physical, and processing solutions suggested in the scientific and patent literature to improve storage stability are extensively discussed, with particular attention to an emerging class of asphalt binders in which the technologies of polymer-modified asphalts and polymer nanocomposites are combined. These polymer-modified asphalt nanocomposites have been introduced less than ten years ago and still do not meet the requirements of industrial practice, but they may constitute a solution for both the performance and storage requirements.

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Section: Asphalt Interaction With Eva and Other Ethylene-based Plastomentioning

confidence: 97%

Section: Asphalt Interaction With Eva and Other Ethylene-based Plastomentioning

confidence: 99%

A review of the fundamentals of polymer-modified asphalts: Asphalt/polymer interactions and principles of compatibility

Polacco

Filippi

Merusi

et al. 2015

Advances in Colloid and Interface Science

524

184

View full text Add to dashboard Cite

show abstract

“…However, the two first classes of polymers usually present a limited compatibility with bitumen. The addition of reactive polymers, which contain functional groups able to react with certain bitumen compounds, may yield some advantages in the resulting binder [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Processing of bitumens modified by a bio-oil-derived polyurethane

Cuadri¹,

García‐Morales²,

Navarro³

et al. 2014

Fuel

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Castor oil (CO) functionalized by isocyanate groups (-NCO) is proposed as a novel bio-based reactive polyurethane (PU) for bitumen modification. This work presents a comparative analysis conducted on blends of bitumen and 2 wt.% of a PU prepolymer prepared by NCO-functionalization of castor oil. Four preparation procedures were evaluated, which resulted from the combination of two processing times (1h or 24h, at 90ºC) followed by two different post-treatments (water addition or ambient curing for up to 6 months). It was found that the degree of modification attained after posttreatment depends on the previous processing conditions. Thus, short processing times are required if the binder is further subjected to ambient curing. Instead, the success of the water-addition modification falls on a previous long processing step. As revealed by rheological tests, ambient curing was seen to be by far a more efficient way of modification if compared to direct addition of water, and makes clear that the resulting binder evolves towards a better performance when in service. In that sense, Thin Layer Chromatography tests, Modulated DSC and AFM images demonstrated a more complex microstructure characterized by the presence of a larger content of molecules with higher polarity, size and molecular weight.

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“…The physico-chemical behaviour of bitumen depends on the relative concentration of its different fractions. Accordingly, a variation in its composition may strongly affect its mechanical properties and chemical reactivity (Becker et al 2003;Iqbal et al 2006). Regarding this concern, the selection of the bitumen to be reactively modified is a key factor in achieving successful binder modification.…”

Section: 4mentioning

confidence: 99%