ESEM Microstructural and Physical Properties of Virgin and Laboratory Aged Bitumen

Mikhailenko, Peter; Baaj, Hassan; Kou, Changjiang; Poulikakos, Lily D.; Falchetto, Augusto Cannone; Besamusca, Jeroen; Hofko, Bernhard

doi:10.1007/978-3-030-00476-7_24

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…In this investigation, ESEM was used to study the microstructure of asphalt binder with different percentages of geopolymer, 3, 6 and 9%. It is noted that the microstructure of the asphalt binder with 0% of geopolymer matches the microstructure reported by Mikhailenko et al [39]; whereas, there is no significant effect of adding 3, 6, and 9% of geopolymer on the structure of the fibrils in ESEM imaging. In addition, the nanoparticles of the geopolymer were observed under ESEM, as shown in Figure 11.…”

Section: Effects Of Geopolymer On the Microstructure Of The Bindersupporting

confidence: 84%

Evaluating Fly Ash‐Based Geopolymers as a Modifier for Asphalt Binders

Hamid

Alfaidi

Baaj

et al. 2020

Advances in Materials Science and Engineering

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Severe Canadian winter conditions and growing traffic volumes are vital factors resulting in a reduction of the service life of flexible pavements. Researchers and engineers strived to develop several additives to develop balanced asphalt mixers capable of resisting distresses that caused deterioration of flexible pavements in Canada. In this study, a critical literature review regarding the use of geopolymers and their application in construction materials is provided. Moreover, an experimental matrix of laboratory testing was conducted to study the rheological and microstructural properties of the PG 58-28 asphalt binder, with different percentages (0%, 3%, 6%, and 9%) of geopolymer. The effect of geopolymer-curing time on rheological properties was investigated. Rotational viscometer, dynamic shear rheometer (DSR), and environmental scanning electron microscopy (ESEM) imaging devices were used to compare the performance of control binder with a binder with different percentages of geopolymers. Results indicated that the increase in the geopolymer content and the curing time affect the rheological behavior of the asphalt binder by increasing its viscosity, complex shear modulus, and failure temperature. Samples with higher geopolymer percentage exhibited better performance in terms of rutting resistance. Moreover, an increase in the failure temperature of modified asphalt binder with 9% geopolymer is recorded as 8.58%, 14.2%, and 15.2% for curing times of 2, 7, and 14 days, respectively, compared with virgin asphalt. Furthermore, the nanoparticles appear to be well dispersed in the binder, and increasing the percentage of the geopolymer does not seem to affect the microstructure of the binder. Overall research conclusion is that geopolymer application resulted in a potential enhancement of some of the properties of the asphalt binder.

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Section: Effects Of Geopolymer On the Microstructure Of The Bindersupporting

confidence: 84%

Evaluating Fly Ash‐Based Geopolymers as a Modifier for Asphalt Binders

Hamid

Alfaidi

Baaj

et al. 2020

Advances in Materials Science and Engineering

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“…Nevertheless, this review suggests that even these few works, provided in Table 2, report 276 a consistent evolution of the captured fibril network with oxidation. More specifically, the studies so far support 277 that the fibril network formation time is increasing with ageing [104,105,[108][109][110][111][112], whereas it was observed that 278 this three-dimensional network is becoming also denser and coarser [104][105][106][107][109][110][111]. Processing of the ESEM 279 images in aged bituminous samples also showed that the fibril size (area, diameter, length) varies differently based 280 on the examined bitumen which can either increase [106,107,112] or decrease [104,105,[108][109][110][111].…”

Section: Ageing-induced Microstructure 274mentioning

confidence: 99%

“…More specifically, the studies so far support 277 that the fibril network formation time is increasing with ageing [104,105,[108][109][110][111][112], whereas it was observed that 278 this three-dimensional network is becoming also denser and coarser [104][105][106][107][109][110][111]. Processing of the ESEM 279 images in aged bituminous samples also showed that the fibril size (area, diameter, length) varies differently based 280 on the examined bitumen which can either increase [106,107,112] or decrease [104,105,[108][109][110][111]. More extensive 281 research is needed in the near future for the effect of ageing in modified bitumens with thermosets or crumb rubber 282 [113].…”

Section: Ageing-induced Microstructure 274mentioning

confidence: 99%

Application of Atomic Force (AFM), Environmental Scanning Electron (ESEM) and Confocal Laser Scanning Microscopy (CLSM) in bitumen: A review of the ageing effect

Pipintakos

Hasheminejad

Lommaert

et al. 2021

Micron

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“…It appears that other microscopic techniques such as the Environmental Scanning Electron Microscopy (ESEM) are also able to capture a fibril network [20], which is becoming denser and coarser with ageing, but not the bee formations [21]. Additionally, fluorescence, optical brightand dark-field, as well as scanning microscopy, have been utilised in the last decades to investigate the morphology of bitumen and the effects of ageing [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%