Differential Scanning Calorimetry Study of Asphalt Crystallinity

Daly, William H.; Qiu, Zhaoyao

doi:10.1177/0361198196153500108

Cited by 8 publications

References 5 publications

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Investigation of flow properties of asphalt binders containing polymer modifiers

et al. 2008

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Modified asphalts using polymeric additives, including isotactic polypropylene (iPP) and different degrees of chlorinated polypropylene (CPP), have been prepared and examined using differential scanning calorimetry (DSC), scanning electron microscopy (SEM), rotational viscometer, and dynamic shear rheometer (DSR) in this study. The results of DSC studies show that different levels of the crystallization occur in asphalt/iPP blends because most of the crystallinity of iPP remain intact in the blend, while those asphalt samples having CPP tend to affect the thermal behavior in the DSC thermograms because of increasing the amorphous region of CPP. From the images of SEM, the distinctions of the phase distributions between the asphalt/iPP and asphalt/CPP blends illustrate that the chlorine content in CPP is a significant factor in controlling its compatibility with asphalt. The rheological studies show that the asphalt blends containing CPP (26 wt% of Cl) exhibit higher viscosity in terms of higher temperature to get Newtonian behavior and display superior rutting resistance to avoid permanent deformation at high temperature. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers

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Investigation of flow properties of asphalt binders containing polymer modifiers

et al. 2008

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Evaluation of thermal and viscoelastic properties of asphalt binders by compounding with polymer modifiers

et al. 2010

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A series of potentially useful asphalt blends containing polyethylene with different extents of polarity as modifiers have been prepared and characterized for asphalt pavement. The results of differential scanning calorimetry (DSC) studies show that poly(ethylene‐graft‐maleic anhydride) (MPE) exhibit more interaction with asphalt phase than low density polyethylene (LDPE) and high density polyethylene (HDPE) due to more dispersion of the amorphous content of MPE into the asphalt matrix. The phase distributions of micrographs from scanning electron microscopy (SEM) confirm that polyethylene modifiers with different extents of polarity in asphalt blends results in dispersion of polymer additive into the asphalt phase and affect the certain degree of the phase separation of asphalt blends. From rheological studies, most of asphalt blends exhibit superior performance at higher temperature with increasing the contents of modifiers such as reducing Newtonian flow response, enhancing rutting resistance as well as frequency of loading and improving creep resistance than tank asphalt. POLYM. COMPOS., 31:1738–1744, 2010. © 2010 Society of Plastics Engineers.

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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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Differential Scanning Calorimetry Study of Asphalt Crystallinity

Cited by 8 publications

References 5 publications

Investigation of flow properties of asphalt binders containing polymer modifiers

Investigation of flow properties of asphalt binders containing polymer modifiers

Evaluation of thermal and viscoelastic properties of asphalt binders by compounding with polymer modifiers

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

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