Rheological properties and storage stability of bitumen/SBS/montmorillonite composites

Galooyak, Saeed Sadeghpour; Dabir, Bahram; Nazarbeygi, Ali Ehsan; Moeini, Alireza

doi:10.1016/j.conbuildmat.2009.08.032

Cited by 246 publications

(106 citation statements)

References 21 publications

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“…It can also be observed the presence of a δ plateau at intermediate loading frequency-temperature for modified binders as an indication of a polymer elastic network. 23 The similarity of the plots of δ as a function of frequency along the entire range (for all the binders) suggests that the molecular interaction between additives and the asphalt binder is quite similar. The master curves of G*, G', G" and δ indicate that the degree of SBS and SBS/organoclays modification is more significant at low frequency (high temperatures).…”

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confidence: 94%

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Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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Neste trabalho, investigou-se o efeito da vermiculita e montmorilonita organicamente modificadas (OVMT e OMMT, respectivamente) em ligante asfáltico (AB) modificado por SBS (butadieno-estireno-butadieno). As propriedades físicas e reológicas foram avaliadas para AB, 4,0% SBS MB e nanocompósitos AB modificados por 2,5% SBS com 2,5% de organoargilas. Os ligantes modificados (MB) resultaram no aumento do módulo complexo (G*) e na redução do ângulo de fase (δ), o que significa maior resistência destes à deformação permanente. A viscosidade, penetração e suscetibilidade térmica foram adequadas. Nos diagramas black, observou-se que o efeito da presença das nanoargilas OVMT e OMMT foi semelhante ao efeito da Cloisite ® . As propriedades reológicas dos nanocompósitos foram comparáveis às do 4,0% SBS MB, identificando uma redução de custos, dado o potencial de substituição de polímero pela argila. A presença da OVMT melhorou a estabilidade à estocagem do SBS MB, um resultado importante, visto que a separação de fases é um dos maiores obstáculos ao uso do SBS na pavimentação.In this work, it was investigated the effect of organically modified vermiculite and montmorillonite (OVMT and OMMT, respectively) in asphalt binders (AB) modified by SBS (styrene-butadiene-styrene). The physical and rheological properties were performed for AB, 4.0% SBS MB and nanocomposite AB modified by 2.5% SBS with 2.5% of organoclays. The modified binders (MB) result in the enhancement of complex modulus (G*) and reduction of phase angle (δ), which means greater resistance to permanent deformation. The viscosity, penetration and thermal susceptibility were appropriate. The black diagrams show that the effect of nanoclays OVMT and OMMT was similar to the effect of Cloisite ® . The rheological properties of the nanocomposite were comparable to the 4.0% SBS MB, identifying a cost reduction due to the potential of replacing polymer with clay. The presence of OVMT improved the storage stability of SBS MB, an important result, as the phase separation is a major obstacle to the use of SBS in paving. Keywords: asphalt binder, SBS, montmorillonite, vermiculite, rheology IntroductionPetroleum asphalt has been widely used as binder in road pavements to provide adhesive and protective coating to aggregates. The rheological behavior of a binder is complex, varying from viscous to elastic depending on loading rate and temperature. It has to be fluid enough at high temperature when pumped and mixed with aggregates and has to be stiff enough at service temperature so that, it can resist rutting. In addition, it can not be too stiff in order to avoid thermal cracking. Thus, rheological properties of asphalt binders are of major concern since they are directly related to the field performance.For many years, conventional pure asphalt performed satisfactorily. Due to the increase of traffic loads and also to environmental factors, pure asphalt does not always perform as it is expected. Polymer modified asphalts were developed to overcome distress problems. 1-3 The...

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confidence: 94%

“…From the rheological point of view, the premixed blend (SBS/clay as a nanocomposite) is not equivalent to the physical blend (adding polymer and clay separately to the asphalt). In all cases, 23 the term triple nanocomposite is used to characterize a blend of asphalt/polymer/ nanoclay.…”

Section: Introductionmentioning

confidence: 99%

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Pamplona¹,

Amoni²,

Alencar³

et al. 2012

J. Braz. Chem. Soc.

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show abstract

“…However, SBS copolymers are far from perfect. For example, the compatibility between bitumen and SBS is not that good [23,83,134]. Storage instability of SBS modified bitumen was reported with images as Figure 8 [83].…”

Section: Thermoplastic Elastomersmentioning

confidence: 99%

“…It is claimed that their use in PMB is mainly for two aims: (1) improving the ageing resistance of PMB with barrier properties of the dispersed clay platelets and (2) enhancing the storage stability of PMB by decreasing the density difference between polymer modifiers and bitumen [134]. As shown in Figure 9A, the commonly used clay minerals in PMB, such as montmorillonite and kaolinite, have a 2:1-type layered structure, which means that layers in their crystal structure are made up of two tetrahedrally coordinated silicon atoms fused to an edge-shared octahedral sheet of either aluminum or magnesium hydroxide [152].…”

Section: Hydrophobic Clay Mineralsmentioning

confidence: 99%

Polymer modification of bitumen: Advances and challenges

Zhu

Birgisson

Kringos

2014

European Polymer Journal

745

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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“…It increases the elasticity of bitumen. It has been identified that SBS can obviously improve the mechanical properties of mixtures such as aging [9,10], permanent deformation [11][12][13][14][15][16][17], low temperature cracking [18][19][20] and moisture damage resistance [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Evaluation of the Stiffness Modulus of a Modified Bituminous Concrete with PR PLAST Sahara

Harizi¹,

Morsli²,

Bensaibi³

2013

JCEA

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Uneven roads surface can be observed on bituminous pavements. This is due to moving loads and climate conditions. If the observed deformations exceed the elastic limit, important damages can occur, so new materials are used to improve the stiffness modulus of bituminous mixtures. To achieve this, a modified bituminous concrete by addition of the PR PLAST Sahara (produced by PR industries and PLAST for Plastic) mainly used in arid region has been studied. The use of this additive at various percentages 0.1, 0.3, 0.6 and 0.9 by weight of bituminous concrete has been investigated to determine its stiffness modulus. An experimental design using the Taguchi tables has been elaborated to reduce the number of tests. Marshall and NAT (Nottingham asphalt tester) tests have been carried out, and a mathematical model of the stiffness modulus has been proposed.

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Rheological properties and storage stability of bitumen/SBS/montmorillonite composites

Cited by 246 publications

References 21 publications

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Asphalt binders modified by SBS and SBS/nanoclays: effect on rheological properties

Polymer modification of bitumen: Advances and challenges

Laboratory Evaluation of the Stiffness Modulus of a Modified Bituminous Concrete with PR PLAST Sahara

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