The Morphology of Bitumen-SBS Blends by UV Microscopy. An Evaluation of Preparation Methods

Soenen, Hilde; Lu, Xionggang; Redelius, Per

doi:10.3166/rmpd.9.97-110

Cited by 20 publications

(35 citation statements)

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“…However, despite the large amount of research dedicated to the rheological analysis of these materials, only a very limited number of investigations concern the dependence of these test results on specimen handling prior to the testing. Soenen et al [28][29][30] pointed out that rheological properties of various modified binders, including wax modified binders, are highly dependent on their thermal history and storage prior to the testing. Furthermore, they concluded that deviations in the rheological data of wax modified binders are related to the crystallization (or melting) of wax.…”

Section: Introductionmentioning

confidence: 99%

Rheological characterization of wax modified bituminous binders: Effect of specimen preparation and thermal history

Laukkanen

Soenen²

2015

Construction and Building Materials

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Section: Introductionmentioning

confidence: 99%

Rheological characterization of wax modified bituminous binders: Effect of specimen preparation and thermal history

Laukkanen

Soenen²

2015

Construction and Building Materials

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“…Some previous investigations [14,28] have observed that SBS modified bitumen separates upon cooling and shows an upper critical solution temperature (UCST) on the phase diagram. In this case, when the temperature is high enough (e.g.…”

Section: Phase-field Modelling For Phase Separation In Pmbmentioning

confidence: 99%

“…Experimentally, the phase separation behaviour of three different PMBs (numbered I, II and III) with the same SBS copolymer modifier (5% by weight of the blend) was observed with a microscope. The experimental procedure represented the same condition as the numerical simulation: the thin film method [14] was used for sampling and isothermal annealing conditioning was conducted at 180 °C. Two light sources were used, i.e.…”

Section: Experimental Characterization and Numerical Reproductionmentioning

confidence: 99%

“…the separation of polymer-rich phase from bitumen-rich phase [11]. Many previous studies [1][2][3][4][5][12][13][14][15] have experimentally investigated the effects of bitumen and polymer properties and their compatibility on the PMB morphology and storage stability. However, these studies found it difficult to demonstrate the key parameters controlling the phase separation process.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and numerical simulation of phase separation in polymer modified bitumen by phase-field method

Zhu

Balieu

et al. 2016

Materials & Design

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In this paper, a phase-field model with viscoelastic effects is developed for polymer modified bitumen (PMB) with the aim to describe and predict the PMB storage stability and phase separation behaviour. The viscoelastic effects due to dynamic asymmetry between bitumen and polymer are represented in the model by introducing a composition-dependent mobility coefficient. A double-well potential for PMB system is proposed on the basis of the Flory-Huggins free energy of mixing, with some simplifying assumptions made to take into account the complex chemical composition of bitumen. The model has been implemented in a finite element software package for pseudo-binary PMBs and calibrated with experimental observations of three different PMBs. Parametric studies have been conducted. Simulation results indicate that all the investigated model parameters, including the mobility and gradient energy coefficients, interaction and dilution parameters, have specific effects on the phase separation process of an unstable PMB. In addition to the unstable cases, the model can also describe and predict stable PMBs. Moreover, the phase inversion phenomenon with increasing polymer content in PMBs is also well reproduced by the model. This model can be the foundation of an applicable numerical tool for prediction of PMB storage stability and phase separation behaviour.

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“…But at a lower temperature, it is closely related to the PMB morphology which may affect the binder properties at that temperature. Some previous studies [10][11][12] have indicated that the thermal condition has important influences on the PMB microstructure. This means that the temperature level and its changing rate can significantly affect the phase separation behaviour of a PMB.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on phase separation in polymer-modified bitumen: effect of thermal condition

Zhu

Balieu

Lu³

et al. 2017

J Mater Sci

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With the aim to understand the effect of thermal condition on phase separation in polymer-modified bitumen (PMB), this paper numerically investigates four PMB binders under five thermal conditions between 140 and 180°C. Based on a phase-field model previously developed by the authors for PMB phase separation, the updated model presented in this paper uses temperature-dependent parameters in order to approach the concerned temperature range, including mobility coefficients, interaction and dilution parameters. The model is implemented in a finite element software package and calibrated with the experimental observations of the four PMBs. The experimental results are well reproduced by the model, and it is thus believed that the calibrated parameters can represent the four PMBs. The simulation results indicate that the model proposed in this paper is capable of capturing the stability differences among the four PMBs and their distinct microstructures at different temperatures. Due to the transition of some PMBs from the thermodynamically stable state at 180°C to the unstable state at 140°C, a homogenization process may occur during the cooling applied numerically. After the transition, the PMBs start to separate into two phases and gradually form the binary structures controlled by the temperature. It is indicated that the cooling rate slightly affects the final pattern of the PMB binary microstructure, although the process can be more complicated in reality due to the potential dynamic reasons.

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The Morphology of Bitumen-SBS Blends by UV Microscopy. An Evaluation of Preparation Methods

Cited by 20 publications

References 0 publications

Rheological characterization of wax modified bituminous binders: Effect of specimen preparation and thermal history

Rheological characterization of wax modified bituminous binders: Effect of specimen preparation and thermal history

Modelling and numerical simulation of phase separation in polymer modified bitumen by phase-field method

Numerical investigation on phase separation in polymer-modified bitumen: effect of thermal condition

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