Newly observed effects of water on the microstructures of bitumen surface

Santos, Salomé dos; Partl, Manfred N.; Poulikakos, Lily D.

doi:10.1016/j.conbuildmat.2014.08.076

Cited by 65 publications

(42 citation statements)

References 34 publications

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“…These two observations are similar to other observations reported in previous works [9]. The phenomena and mechanisms behind these observations will be the subject of future work.…”

Section: Bitumensupporting

confidence: 92%

From virgin to recycled bitumen: A microstructural view

Santos¹,

Partl²,

Poulikakos³

2015

Composites Part B: Engineering

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“…These two observations are similar to other observations reported in previous works [9]. The phenomena and mechanisms behind these observations will be the subject of future work.…”

Section: Bitumensupporting

confidence: 92%

From virgin to recycled bitumen: A microstructural view

Santos¹,

Partl²,

Poulikakos³

2015

Composites Part B: Engineering

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“…AFM results showed that the so-called "bee" structures located in the center of presumably wax crystallites (dos Santos et al 2014b;Lyne et al 2013), were present on the surface of all virgin bitumens, blended bitumens and mastic samples. Additionally, films prepared using cr_slow presented higher surface roughness than films prepared using cr_fast.…”

Section: Resultsmentioning

confidence: 98%

Thermal and Water Effects on Virgin Bitumen, Recycled and Mastic Mixtures

2015

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Blending between aged bitumen from reclaimed asphalt pavement (RAP) and virgin bitumen is important in recycled asphalt. In this work, bitumen blends prepared by mixing virgin bitumen and recovered bitumen from RAP, were investigated as well as mastic mixtures prepared by mixing virgin bitumen with RAP. The aim of the study was to investigate the differences between virgin bitumen, bitumen blends containing different amounts of bitumen recovered from RAP, and mastic mixtures, in terms of surface microstructure, rheological properties and wetting behaviour. Thermal studies were carried out using different mixing times, annealing temperatures and cooling rates. The change in the molecular assembly was determined using attenuated total reflectance Fourier transform infrared spectroscopy; surface properties were evaluated using atomic force microscopy and the rheological properties were evaluated using dynamic shear rheometer. It was observed that the shear complex modulus and phase angle as well as the surface properties of the bitumen blends depended on the BitRAP content. The cooling rate of bitumen films influenced strongly the surface properties such as the roughness and size of the so-called "bee" structures as well as the molecular assembly. Additionally, contact angle measurements performed during dispensing of a water drop on the bitumen surface showed that in the presence of water, the viscoelastic bitumen films deformed at the three phase (bitumen-water-vapour) contact line and the deformation was influenced by the cooling rate of the bitumen films.

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“…Dos Santos et al . () reported that, by buttering the asphalt binder at room temperature with no heat treatment, no ‘bee’ structures were observed, although it was not specified what the thickness of the sample was.…”

Section: Resultsmentioning

confidence: 99%

“…Dos Santos et al . () did not detect any catana and peri phase in the binder before annealing at 110°C, although these microstructures are detectable after annealing: this suggests that the heat treatment plays a role in the development of microstructures. Menapace et al .…”

Section: Introductionmentioning

confidence: 88%

Effect of treatment temperature on the microstructure of asphalt binders: insights on the development of dispersed domains

Menapace

Masad

Bhasin

2015

Journal of Microscopy

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This paper offers important insights on the development of the microstructure in asphalt binders as a function of the treatment temperature. Different treatment temperatures are useful to understand how dispersed domains form when different driving energies for the mobility of molecular species are provided. Small and flat dispersed domains, with average diameter between 0.02 and 0.70 μm, were detected on the surface of two binders at room temperature, and these domains were observed to grow with an increase in treatment temperature (up to over 2 μm). Bee-like structures started to appear after treatment at or above 100°C. Moreover, the effect of the binder thickness on its microstructure at room temperature and at higher treatment temperatures was investigated and is discussed in this paper. At room temperature, the average size of the dispersed domains increased as the binder thickness decreased. A hypothesis that conciliates current theories on the origin and development of dispersed domains is proposed. Small dispersed domains (average diameter around 0.02 μm) are present in the bulk of the binder, whereas larger domains and bee-like structures develop on the surface, following heat treatment or mechanical disturbance that reduces the film thickness. Molecular mobility and association are the key factors in the development of binder microstructure.

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Newly observed effects of water on the microstructures of bitumen surface

Cited by 65 publications

References 34 publications

From virgin to recycled bitumen: A microstructural view

From virgin to recycled bitumen: A microstructural view

Thermal and Water Effects on Virgin Bitumen, Recycled and Mastic Mixtures

Effect of treatment temperature on the microstructure of asphalt binders: insights on the development of dispersed domains

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