Predicting low temperature physical hardening in asphalt binders

Tabatabaee, Hassan A.; Velasquez, Raul; Bahia, Hussain U.

doi:10.1016/j.conbuildmat.2012.02.039

Cited by 94 publications

(49 citation statements)

References 15 publications

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“…Findings reported above are coherent with those reported by Tabatabaee et al (2012). They can be explained by considering that at temperatures lower than a certain limit, specific volume tends to a new thermodynamic equilibrium with an energy level higher than that of temperatures far above the glass transition region.…”

Section: Resultssupporting

confidence: 93%

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Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

et al. 2015

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Physical hardening is a phenomenon that takes place at low temperatures, producing time-dependent isothermal changes in the rheological properties of bituminous binders. Stiffening effects caused by physical hardening combine with those consequent to chemical ageing, thus promoting the build-up of thermally-induced stresses which may lead to premature pavement failure. The main goal of this paper was to investigate the influence of physical hardening on low temperature properties of bituminous binders tested in different ageing conditions. Moreover, reversibility of hardening phenomena was directly assessed by means of a dedicated testing protocol. The study, carried out by making use of the Bending Beam Rheometer (BBR), considered four binders of different type and origin (two neat bitumens and two commercial SBS polymer-modified binders) and three ageing conditions (original, short-term ageing and long-term ageing). Obtained results, expressed in terms of a Physical Hardening Rate (PHR), showed a significant effect of chemical ageing on low temperature hardening of binders. In particular, rate of hardening was found to vary with temperature and to decrease with degree of ageing. Reversibility of the hardening process was also verified.

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Section: Resultssupporting

confidence: 93%

“…Similar to HI is the Hardening Rate Baglieri et al 2012) (HR) proposed by Tabatabaee et al (2012), that considers the relative increase in stiffness caused by an increase of storage period.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

et al. 2015

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“…Although the variations in the aging shift rate are relatively small in the investigated temperature range, it may be noted that the rate of physical aging appears to be highest at Tg or very close to it (μ Tg ≈ 0.60), while decreasing at temperatures further away from Tg (μ Tg+10 K ≈ μ Tg-10 K ≈ 0.40). This Planche et al (1998) and Tabatabaee et al (2012) who studied the temperature dependence of physical aging in a total of 55 bituminous binders by means of bending beam rheometer (BBR) measurements. In comparison with other smallmolecule glass-forming liquids, aging shift rates of similar order of magnitude have been reported for m-toluidine (μ = 0.50), glycerol (μ = 0.38) and sucrose benzoate (μ = 0.25) at Tg-6 K (Hutcheson and McKenna 2008).…”

Section: Figmentioning

confidence: 99%

Characterization of physical aging by time-resolved rheometry: fundamentals and application to bituminous binders

2018

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Physical aging is a ubiquitous phenomenon in glassy materials and it is reflected, for example, in the time evolution of rheological properties under isothermal conditions. In this paper, time-resolved rheometry (TRR) is used to characterize this time-dependent rheological behavior. The fundamentals of TRR are briefly reviewed, and its advantages over the traditional Struik's physical aging test protocol are discussed. In the experimental section, the TRR technique is applied to study physical aging in bituminous binders. Small-diameter parallel plate (SDPP) rheometry is employed to perform cyclic frequency sweep (CFS) experiments over extended periods of time (from one to 8.6 days). The results verify that the mutation of rheological properties is relatively slow during physical aging (mutation number N'mu << 1), thus allowing rheological measurements on a quasi-stable sample. The effects of temperature, crystallinity and styrene-butadiene-styrene (SBS) polymer modification on the physical aging of bitumen are evaluated. The time-aging time superposition is found to be valid both for unmodified and for polymer modified bitumen. Vertical shifts are necessary, in addition to horizontal time-aging time shifts, to generate smooth master curves for highly SBS modified bitumen.

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“…The glass transition temperature of the control asphalt model is around 300 K [24]. As shown in the Figure, it is deduced that the Tg of the xGNP modified asphalt system is around 250 K. Based on the laboratory data in the reference [43], the Tg of asphalt ranges from 223 K to 303 K. The Tg of the modified asphalt model is within the laboratory data range, and it is also better than the reference data [18] (298 K-358 K) of the asphalt model. In order to get better thermal relaxation in the asphalt, a low Tg of asphalt is expected.…”

Section: Glass Transition Temperaturementioning

confidence: 99%

Property Analysis of Exfoliated Graphite Nanoplatelets Modified Asphalt Model Using Molecular Dynamics (MD) Method

et al. 2017

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This Molecular Dynamics (MD) simulation paper presents a physical property comparison study between exfoliated graphite nanoplatelets (xGNP) modified and control asphalt models, including density, glass transition temperature, viscosity and thermal conductivity. The three-component control asphalt model consists of asphaltenes, aromatics, and saturates based on previous references. The xGNP asphalt model was built by incorporating an xGNP and control asphalt model and controlling mass ratios to represent the laboratory prepared samples. The Amber Cornell Extension Force Field (ACEFF) was used with assigned molecular electro-static potential (ESP) charge from NWChem analysis. After optimization and ensemble relaxation, the properties of the control and xGNP modified asphalt models were computed and analyzed using the MD method. The MD simulated results have a similar trend as the test results. The property analysis showed that: (1) the density of the xGNP modified model is higher than that of the control model; (2) the glass transition temperature of the xGNP modified model is closer to the laboratory data of the Strategic Highway Research Program (SHRP) asphalt binders than that of the control model; (3) the viscosities of the xGNP modified model at different temperatures are higher than those of the control model, and it coincides with the trend in the laboratory data; (4) the thermal conductivities of the xGNP modified asphalt model are higher than those of the control asphalt model at different temperatures, and it is consistent with the trend in the laboratory data.

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Predicting low temperature physical hardening in asphalt binders

Cited by 94 publications

References 15 publications

Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

Experimental Investigation on the Combined Effects of Physical Hardening and Chemical Ageing on Low Temperature Properties of Bituminous Binders

Characterization of physical aging by time-resolved rheometry: fundamentals and application to bituminous binders

Property Analysis of Exfoliated Graphite Nanoplatelets Modified Asphalt Model Using Molecular Dynamics (MD) Method

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