Utilization of Reclaimed Polyethylene in Bituminous Paving Mixes

Panda, Mahabir; Mazumdar, Mayajit

doi:10.1061/(asce)0899-1561(2002)14:6(527)

Cited by 90 publications

(32 citation statements)

References 4 publications

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“…For this reason, their main application is in asphaltic roofing membranes, where the high-shear mixing phase is followed by a rapid cooling that freezes the morphology, which remains kinetically stable during room-temperature storage. Nevertheless, extensive literature on olefinic PMAs for paving applications is available (see e.g., [76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93]), but storage stability is not often mentioned.…”

Section: Asphalt/polyolefins Compatibilitymentioning

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

498

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/polyolefins Compatibilitymentioning

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

498

184

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“…It is not surprising that researchers have been very interested in incorporating waste polyethylene into asphalt pavements, as a modifier (Hinislioglu and Agar 2004;Edwards 2003;Panda and Mazumdar 2002;Murphy et al 2000Murphy et al , 2001Yousefi et al 2000;Morrison et al 1994;Liang 1993;Little 1993) or aggregate replacement (Zoorob 2000). However, using waste polyethylene as a modifier in hot-mix asphalt can be quite complicated.…”

Section: Introductionmentioning

confidence: 97%

Study of recycled polyethylene materials as asphalt modifiers

Ho¹,

Church²,

Klassen³

et al. 2006

Can. J. Civ. Eng.

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There has been interest in modifying asphalt with polyethylene materials, which are a major plastic waste substance, especially low-density polyethylene (LDPE). In this study, combinations of three low molecular weight polyethylene (PE) wax materials and three recycled LDPE materials were used as asphalt modifiers. The modified asphalts were studied using the Superpave TM MP1 and MP1a specifications, 1% direct tension test (DTT) failure strain criteria, phase separation, and microscopy. When the molecular weight distribution of the polyethylene modifiers was widened, the bending beam rheometer thermal stress curve of the modified asphalt shifted to the low-temperature end, giving a better critical cracking temperature. Not all recycled LDPE are the same. When using recycled LDPE in asphalt modification, we have to consider the LDPE properties, such as molecular weight and molecular weight distribution, which have been found to play important roles in asphalt's low-temperature properties, hot storage stability, and polymer phase distribution. This study showed that LDPE with lower molecular weight and wider molecular weight distribution are more suitable materials for asphalt modification, compared with high molecular weight LDPE with very narrow molecular weight distribution.Résumé : Il se développe un intérêt envers la modification de l'asphalte par des polyéthylènes, des déchets de plastiques importants, surtout le polyéthylène à faible densité (LDPE). Dans la présente étude, des combinaisons de trois composés de cire de polyéthylène (PE) de faible poids moléculaire et de trois matériaux en LDPE recyclés ont été utilisées comme agents modificateurs de l'asphalte. Les asphaltes modifiés ont été étudiés selon les spécifications MP1 et MP1a Superpave TM , des critères de contrainte de défaillance par essai en traction pure (DTT) de 1 %, la séparation des phases et la microscopie. Lorsque la répartition des poids moléculaires des agents modificateurs du polyéthylène a été élargie, la courbe de contrainte thermique du rhéomètre de flexion de poutre Bending Beam Rheometer de l'asphalte modifié s'est déplacée vers l'extrémité de basse température, donnant une meilleure température critique de fissuration. Les LDPE recyclés ne sont pas tous les mêmes. Lors de l'utilisation de LDPE recyclés dans l'asphalte modifié, nous avons dû tenir compte des propriétés des LDPE telles que le poids moléculaire et la répartition du poids moléculaire, ce qui s'est avéré jouer un rôle important dans les propriétés de l'asphalte à basse température, la stabilité d'entreposage à chaud et la répartition des phases du polymère. La présente étude montre que les LDPE ayant un poids moléculaire plus faible et une répartition plus large du poids moléculaire sont de meilleurs matériaux pour la modification de l'asphalte par rapport aux LDPE de poids moléculaire plus élevé ayant une répartition très étroite du poids moléculaire.Mots clés : superpave, LDPE, polyéthylène, asphalte, recyclé, rhéomètre à flexion de poutre (« bending beam rheometer (B...

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“…waste rubber, waste plastics and polymeric biomass by-products), could have potential applications with greater success in the future. The multifold of research focusing on this domain [161][162][163][164][165][166][167][168][169][170][171][172][173][174][175][176][177] further emphasizes this potential. In spite of good environmentfriendliness, these wastes or by-products usually make some properties of the PMB relatively poor.…”

Section: Future Developmentsmentioning

confidence: 99%

Polymer modification of bitumen: Advances and challenges

Zhu

Birgisson

Kringos

2014

European Polymer Journal

714

287

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Abstract. Advances and challenges in the field of bitumen polymer modification for road construction during the last 40 years are reviewed in this paper. The history of bitumen polymer modification is described chronologically. Some popular plastomers and thermoplastic elastomers in bitumen modification are discussed regarding their advantages and disadvantages, including polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), ethylene-butyl acrylate (EBA), styrene-butadiene-styrene (SBS), styrene-isoprenestyrene (SIS) and styrene-ethylene/butylene-styrene (SEBS). Although these polymers all improve bitumen properties to some extent, there are still some drawbacks limiting the future development of bitumen polymer modification, such as high cost, low ageing resistance and poor storage stability of polymer modified bitumen (PMB). Researchers attempted various ways to remove these drawbacks. Some technical developments for removing drawbacks are reviewed in this paper, including saturation, sulfur vulcanization, adding antioxidants, using hydrophobic clay minerals, functionalization and application of reactive polymers. The future development of polymers for bitumen modification is analyzed as well. Since it is currently challenging to perfectly achieve all expected PMB properties at the same time, some compromised recommendations are given in this paper, among which greatly enhancing the properties with an acceptably high cost, significantly reducing the cost with relatively poor properties and their combinations. Functionalization is emphasized as a promising way to enhance the properties of currently used polymers and develop new-type polymer modifiers with much greater success in the future. It is also recommended that future research on bitumen polymer modification focuses more on function development towards enhancing: adhesion with aggregates, long-term performance and recyclability.

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Utilization of Reclaimed Polyethylene in Bituminous Paving Mixes

Cited by 90 publications

References 4 publications

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

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

Study of recycled polyethylene materials as asphalt modifiers

Polymer modification of bitumen: Advances and challenges

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