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

Laukkanen, Olli-Ville; Soenen, Hilde

doi:10.1016/j.conbuildmat.2015.07.065

Cited by 14 publications

(3 citation statements)

References 57 publications

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“…Soenen et al [19][20][21][22] concluded that the thermal history can have a considerable influence on the morphology of PMB samples and thus can affect the measurement results of rheological properties, especially when the applied loading frequency is low. A similar effect was also observed for other types of modified bitumen, for example, wax-modified bitumen, because of the formation of its microcrystalline network structure [23]. This might have provided a potential way to vary the morphology of PMB with the same raw materials and formulation, that is, to vary the thermal history.…”

Section: Introductionsupporting

confidence: 59%

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

Zhu

Lü²

2021

Front. Struct. Civ. Eng.

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Different microstructures of the same polymer-modified bitumen (PMB) were obtained by subjecting the bitumen modified with styrene-butadiene-styrene (SBS) copolymer to isothermal annealing at various temperatures. The effects of the morphology on the rheological properties of SBS-modified bitumen were investigated within the high-temperature range. The PMB microstructures were quantitatively evaluated using image analysis. A dynamic shear rheometer was used to measure the rheological parameters of the PMB samples and perform the multiple stress creep and recovery (MSCR) test. A quantitative basis could be established on which to discuss the relationship between the PMB morphology and rheology. The image analysis indicated that conditioning by isothermal annealing evidently led to a difference in the microstructure of the samples. Variation of the thermal history is demonstrated to be a practical way to vary the morphology of the PMB with the same raw materials and formulation. Compared with the two-phase morphology, the single-phase microstructure tended to have a narrower linear viscoelastic (LVE) region of the PMB. Within the LVE region, especially at low frequencies, the homogenous PMB can store more energy when experiencing loadings and is more elastic. Outside the LVE region, based on the MSCR test results, the homogenous morphology could assist in reaching a higher percentage of strain recovery after the creep period.

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Section: Introductionsupporting

confidence: 59%

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

Zhu

Lü²

2021

Front. Struct. Civ. Eng.

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“…In addition, the plots indicate that the shape of the curves inclined to be more upward when the nanofillers loading is increased, reflecting that a more obvious network structure is established. [50] It is noteworthy that we also determined the rheological percolation threshold and the gel point of the nanocomposites using the power-law scaling equation [51] and Winter-Chambon criterion, [52] respectively. The results showed that both Figure 5 illustrates the variation of tan δ (damping factor) with ω for the pristine polymers, the blend, and the nanocomposites.…”

Section: Rheologymentioning

confidence: 99%

Physico–mechanical properties of poly(ethylene‐co‐vinyl acetate)/acrylonitrile‐butadiene rubber/multi‐walled carbon nanotubes nanocomposites

Razavi‐Nouri

Salavati

2022

Polymer Composites

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The influence of multi-walled carbon nanotubes (MWCNTs) on thermal, mechanical and wetting properties as well as rheological behavior of poly(ethylene-co-vinyl acetate) (EVA)/acrylonitrile-butadiene rubber nanocomposites were studied. The solid surface free energy (γ s ), work of adhesion (W A ), interfacial free energy (γ sl ), spreading coefficient (S c ) and Girifalco-Good's interaction parameter (ϕ) were calculated for the materials fabricated.The results showed that the contact angle and γ sl decreased; however, γ s , W A , S c , and ϕ increased with the increase in MWCNTs content. The maximum tensile strength and toughness were obtained for the nanocomposite containing 1 wt% nanofillers. It was also found that both of the relaxation ratio (Rr) and relaxation rate index (n) decreased with increasing in the carbon nanotubes (CNTs) concentration. The results designated that the values of Rr and n for the nanocomposite containing 7 wt% MWCNTs were 19% and 60% smaller than those of the unfilled blend, respectively. The Casson plot analysis indicated that the yield stress of the molten materials incremented with the increase in MWCNTs loading according to a quadratic equation. The analysis of crystallization exotherms and melting endotherms revealed that CNTs triggered the crystallization process at slightly higher temperature, however, melting point slightly and the rate of nucleation noticeably reduced with the increase in the nanofillers content.

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“…As a consequence of bitumen modification, binder behavior can become more complicated and more challenging to characterise [9,10]. Additionally, several studies indicated that WMA additives could alter bitumen basic and rheological properties to different extents [11][12][13][14]. This means that traditional bitumen characterisation methods such as penetration or viscosity, or the Superpave performance indicators, such as rutting (G*/sind) or fatigue cracking (G*sind) parameters, may not be valid in characterising the behavior of WMA modified binders since these methods are intrinsically developed for unmodified bitumen [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Thermo-rheological analysis of WMA-additive modified binders

et al. 2020

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Thermo-rheological characteristics of unmodified and modified bitumen have significant impacts on the mechanical response of asphalt. This study investigates the impacts of an organic and a chemical Warm Mix Asphalt additive on bitumen thermo-rheological and mechanical characteristics. Modified binders with different concentrations of each additive were studied and analysed comparatively to a 40/60 penetration grade bitumen. Frequency sweep tests were performed at different ageing levels to characterise the Linear Viscoelastic properties. The multiple stress creep and recovery, linear amplitude sweep (LAS) and low temperature creep stiffness tests, together with the Glover-Rowe (G-R) fatigue parameter (determined from fitting of the 2S2P1D model to the complex shear modulus and phase angle master curves) were used to analyse the performance of the binders at critical operating temperatures. The results demonstrated the necessity to analyse the behavior of the studied binders beyond the limits of linear viscoelasticity to better characterise these types of bitumen. The results also indicated that both additives retarded bitumen ageing with the organic additive increasing bitumen elastic response while the chemical additive increased its viscous response. The results also showed an excellent correlation between the G-R parameter and LAS results which suggests the ability to use this parameter in characterising fatigue performance of the studied binders. This also suggests that bitumen fatigue life may be improving over time due to the increased elastic behahviour during ageing so long as a certain critical level of ageing is not reached.

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

Cited by 14 publications

References 57 publications

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

Influence of morphology on high-temperature rheological properties of bitumen modified with styrene-butadiene-styrene (SBS) copolymer

Physico–mechanical properties of poly(ethylene‐co‐vinyl acetate)/acrylonitrile‐butadiene rubber/multi‐walled carbon nanotubes nanocomposites

Thermo-rheological analysis of WMA-additive modified binders

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