Morphological analysis of bitumen phases using atomic force microscopy

Aguiar-Moya, José Pablo; Salazar-Delgado, Jorge; Bonilla-Mora, Vivian; Rodríguez-Castro, Ellen; Leiva-Villacorta, Fabricio; Loría-Salazar, Luis Guillermo

doi:10.1080/14680629.2015.1029672

Cited by 41 publications

(10 citation statements)

References 14 publications

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“…Asphaltenes/colloid determine the distribution and geometric characteristics of the “bee‐like structure”, aromatic phenol provides the base of the “bee‐like structure”, saturated fraction provides the surface environment, and the surface roughness of asphalt is mainly determined by the bee‐like structure 37,38 . Under the same volume fraction, the area proportion of “bee‐like structure” of LAM is the largest, followed by CAM and GAM, and the area proportion of FAM is the smallest.…”

Section: Resultsmentioning

confidence: 99%

Evaluation and mechanism of interaction effect between thermoplastic polyurethane elastomer modified asphalt and fillers

Jin

Wang

Yang

et al. 2022

J of Applied Polymer Sci

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Thermoplastic polyurethane (TPU) elastomer modified asphalt mastic is regarded as a two-phase composite composed of TPU modified asphalt and filler according to the micro-mechanics theory of composites, and its rheological properties are affected by various types of asphalt, mineral filler, and dosage. In this study, different kinds of fillers (limestone, granite, fly-ash, coal gangue) and TPU modified asphalt (grade of base asphalt labeled as 90# and polyether-based TPU modified asphalt with C h = 40, r = 1.05 through a selfdetermined laboratory process) were prepared into asphalt mastic. The dynamic shear rheology and bending beam rheology (BBR) were used to test and evaluate the high and low temperature rheological properties of TPU modified asphalt mastic with different kinds of fillers. The scanning electron microscopy, atomic force microscopy, Brunauer, Emmett, and Teller method, X-ray diffraction, Fourier transform infrared spectroscopy, and other tests were used to analyze the interaction mechanism between fillers and TPU modified asphalt. The results indicated that the enhancement coefficients λ H and λ L of different fillers are obtained based on the |G*| and S master curve, and the optimum ratio range in TPU modified asphalt with different kinds of fillers are from 1.04 to 1.41. The interaction parameters Luis Ibrarra-A (A-values) and Palierne-C (C-values) were obviously better than K. Ziegel-B (B-values) and Complex shear modulus coefficient (ΔG Ã -values). The surface of coal gangue was rough and emerged micro-void, the BET specific surface area reached 2.681 m 2 /g, which was the largest than the other fillers, and the interaction with TPU modified asphalt was the strongest due to the C-value is 1.562. The chemical composition of coal gangue played an important role in the interaction with asphalt. Physical adsorption is the main mechanism between TPU modified asphalt and fillers. The absorption peak of the original TPU modified asphalt disappeared at 3343 cm À1 , and more CaO and Al 2 O 3 in coal gangue are helpful to improve the interaction ability with TPU modified asphalt. There is a significant correlation between the number and area ratio of "bee-like structure" in TPU modified asphalt mastic and interaction coefficient C-values.

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Section: Resultsmentioning

confidence: 99%

Evaluation and mechanism of interaction effect between thermoplastic polyurethane elastomer modified asphalt and fillers

Jin

Wang

Yang

et al. 2022

J of Applied Polymer Sci

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“…For some specific cases, the difference of various domains is within the error bars and, therefore, not significant. These results, as well as the availability of the chemical functional groups for each fraction of the SARA fractions (Aguiar‐Moya et al ., 2015; Zhang et al ., 2015) are shown in Table 1 and Figure 6, respectively. As indicated, previous reports that used s‐SNOM to characterise bitumen found a distinguishable chemical difference between the para and peri domains and showed that concentrations of sulfoxide and carbonyl groups are different in the peri and para domains (Fischer & Cernescu, 2015); however, the IR spectra of these domains are not reported.…”

Section: Resultsmentioning

confidence: 99%

Bitumen surface microstructure evolution in subzero environments

Baheri

Schutzius

Poulikakos

et al. 2020

Journal of Microscopy

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Bitumen is a widely used material employed as a binder in pavement engineering and as a surface sealant in construction. Its surface microstructure and microscale properties have been shown to be temperature-dependent, with effects manifesting themselves on surface composition and texture, including the formation of the visually striking catana 'bee'like structures. Despite the importance of a good performance of bitumen in subzero environments (<0°C), the behaviour of bitumen surface texture and composition at cold temperatures, affecting cracking, degradation and road icing, has received practically no attention. In particular, such knowledge is relevant to world regions experiencing long periods of subzero temperatures during the year. Employing advanced atomic force microscopy combined with infrared spectroscopy (AFM-IR) and an environmental chamber, we demonstrate the ability to characterise surface structure and composition with nanoscale precision for a broad range of temperatures. We show that cooling bitumen to subzero temperatures can have several interesting effects on its surface microtexture, nanotexture and composition, especially on its three surface domains, catana, peri and para. We found that the para domain coarsens and extends to form an interfacial transition domain (characterised by increasing surface roughness with peri domain composition) between the para and peri domains. We show that the catana and peri domains have a similar composition, but have different mechanical and chemical properties compared to the para domain. The essential findings of this work improve our understanding of the behaviour of bitumen in subzero environments, aiding us in our quest towards attaining better road and sealant performance.

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“…The forces produced between the end of a cantilever beam and bitumen are quantified using atomic force microscopy (AFM) as a function of the distance between the two surfaces [32]. Appendix C presents a schematic of AFM test procedure.…”

Section: Experimental Methodsmentioning

confidence: 99%

Rheological and Morphological Characterization of Modified Bitumen with Cup Lump Rubber

Albuaymi¹,

Alanazi²,

Alanazi³

et al. 2023

Journal of Renewable Materials

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Pure bitumen is not suitable for heavy traffic loads; hence modifiers are used to improve the bitumen performance. Recently, cup lump rubber (CLR) has become a preferred modifier due to its outstanding performance and less cost. However, little is known about the interactions between CLR and bitumen. Thus, this study investigates the behavior of bitumen with CLR. Four percentages of CLR (2.5%, 5.0%, 7.5%, and 10.0% by weight of bitumen) were used to modify conventional 60/70 penetration grade bitumen. The modified bitumen was evaluated through different laboratory testing such as dynamic shear rheometer, rotational viscosity, softening point, bending beam rheometer, ductility, and elastic recovery. The testing results show that the addition of CLR increased the bitumen's rutting resistance by 3 PG grades at high temperatures. At low pavement temperatures, the cup lump rubber modified bitumen (CMB) can withstand up to −34°C. Fourier Transform Infrared (FTIR) analysis shows that the Aromaticity index at 1600 cm -1 rose as the CLR percentage increased, indicating the formation of a binder with a compact structure. This is expected to improve the elasticity of bitumen through π -π interactions. Atomic Force Microscopy (AFM) results showed the Catana phase increased in size and quantity at 5.0% and 7.5% CLR content. While contact angle measurement revealed that the binders are hydrophobic and tend to repel the dropped water on the bitumen surface.

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Morphological analysis of bitumen phases using atomic force microscopy

Cited by 41 publications

References 14 publications

Evaluation and mechanism of interaction effect between thermoplastic polyurethane elastomer modified asphalt and fillers

Evaluation and mechanism of interaction effect between thermoplastic polyurethane elastomer modified asphalt and fillers

Bitumen surface microstructure evolution in subzero environments

Rheological and Morphological Characterization of Modified Bitumen with Cup Lump Rubber

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