Bitumens modified with recycled polymers

Murphy, Michael J.; O’Mahony, Margaret; Lycett, C J; Jamieson, I L

doi:10.1007/bf02480663

Cited by 26 publications

(10 citation statements)

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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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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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“…One of the means for utilizing crumb rubber is in the bitumen as rheology modifier for making rubberized bitumen8 because it contains a variety of rubber polymers, predominantly natural rubber and styrene‐butadiene rubber. Several attempts9–19 have been made on the use of crumb rubber in the modification of bitumen for pavement and roofing purposes by one of the two processes namely a wet process or a dry process. In wet processes, beneficial changes in the properties of bitumen can be achieved by the appropriate blending of additives whereas in the dry process, chemical changes in the bitumen such as bond cleavage or stabilization of additives are extremely difficult.…”

Section: Introductionmentioning

confidence: 99%

Effect of activated crumb rubber on the properties of crumb rubber‐modified bitumen

Singh

Kumar

Gupta

et al. 2013

J of Applied Polymer Sci

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Bitumen modification was made with the activated crumb rubber concentrate and its efficacy was examined in terms of its consistency and rheological properties. It was found that softening point of the activated crumb rubber-modified bitumen increased while its penetration and elastic recovery decreased compared with the nonactivated crumb rubber system. Based on contact angle results, the activated crumb rubber-bitumen system was found to be more wettable and exhibited better adhesion to the substrate than those of other systems. The shifting of glass transition temperature towards higher temperature and the occurrence of inter-mix phases in the activated crumb rubber-bitumen system supported its superior temperature resistance. The difference in viscosity obtained between the activated and nonactivated crumb rubber systems is attributed to the high swelling of activated crumb rubber and its soluble fractions in the bitumen as viewed in scanning electron images. High complex modulus and low phase angle of the activated crumb rubber system over the entire range of temperatures indicated its reduced temperature susceptibility and more elasticity. The activated crumb rubber-bitumen system meets the requirements of commercial standard specification.

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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

715

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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Bitumens modified with recycled polymers

Cited by 26 publications

References 0 publications

Study of recycled polyethylene materials as asphalt modifiers

Study of recycled polyethylene materials as asphalt modifiers

Effect of activated crumb rubber on the properties of crumb rubber‐modified bitumen

Polymer modification of bitumen: Advances and challenges

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