Microstructural Evolution of Asphalt Binder under Combined Action of Moisture and Pressure

Nivedya, M. K.; Trottier, T. G.; Yu, Xiaokong; Tao, Mingjiang; Burnham, Nancy A.; Mallick, Rajib B.

doi:10.1061/jpeodx.0000104

Cited by 7 publications

(4 citation statements)

References 20 publications

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“…The glass substrate was coated with binder sample via the method proposed by 56 . Identification of microstructures in binder is of interest because it illustrates any change of the chemical compounds and molecular interactions in the asphalt binder 57 . The microstructures of binder samples with FSN are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Cheraghian

Wistuba

Kiani

et al. 2021

Sci Rep

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Warm mix asphalt (WMA) is gaining increased attention in the asphalt paving industry as an eco-friendly and sustainable technology. WMA technologies are favorable in producing asphalt mixtures at temperatures 20–60 °C lower in comparison to conventional hot mix asphalt. This saves non-renewable fossil fuels, reduces energy consumption, and minimizes vapors and greenhouse gas emissions in the production, placement and conservation processes of asphalt mixtures. At the same time, this temperature reduction must not reduce the performance of asphalt pavements in-field. Low aging resistance, high moisture susceptibility, and low durability are generally seen as substantial drawbacks of WMA, which can lead to inferior pavement performance, and increased maintenance costs. This is partly due to the fact that low production temperature may increase the amount of water molecules trapped in the asphalt mixture. As a potential remedy, here we use fumed silica nanoparticles (FSN) have shown excellent potential in enhancing moisture and aging susceptibility of asphalt binders. In this study, asphalt binder modification by means of FSN was investigated, considering the effects of short-term and long-term aging on the rheological, thermal, and microstructural binder properties. This research paves the way for optimizing WMA by nanoparticles to present enhanced green asphalt technology.

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Section: Resultsmentioning

confidence: 99%

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Cheraghian

Wistuba

Kiani

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Nazzal et al studied the special bee-like structure of asphalt by AFM and explored the effect of modifiers [7]. Nivedya et al, studied the change of microstructure before and after immersion [8]. Relevant information is extracted from the force-displacement curve, and the nanohardness, friction force, and elastic modulus of the material can be obtained [9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Surface Micro-Mechanical Properties of Various Asphalt Binders Using AFM

et al. 2022

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The microstructure of asphalt affects the micro-mechanical properties. In this study, atomic force microscopy (AFM) was used to investigate the surface elastic modulus and nanohardness of asphalt binder. Relevant mechanical indexes were quantitatively evaluated by contact mechanical model. Five types of asphalts, including different grades, oil sources, and before and after modification, were selected as test objects, and the effects of asphalt binder type, aging, water, and anti-stripping agent on the asphalt micromechanics were explored. The results showed that the micromechanical properties of asphalt binder are affected by grade, oil source, and modification. The aging resistance of modified asphalt binder is better than that of unmodified asphalt binder. Water immersion reduces the surface micromechanical properties of the asphalt binder. The effect of the anti-stripping agent on the modified asphalt binder is greater than that of the unmodified asphalt binder.

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“…Asphalt is a complex mixture composed of polar asphaltenes with condensed aromatics and heteroatoms, resins with fused rings, and maltene (or oil) . The stable microstructure formed by the interactions among these components changes when it comes in contact with externally diffused water. − The microstructural evolution and microphase reorganization were observed through atomic force microscopy (AFM) in the tapping and PeakForce modes. ,− Optical microscopy reveals that microbumps arise and progressively grow until a rough surface with visible bumps and pits is formed. , Moreover, the presence of water accelerates the structural collapse of asphalt undergoing ultraviolet or thermal aging. ,, The morphological characteristics of the asphalt surface is covered by several irregular cracks and crooked ridges and rapidly eroded beyond recognition. These observations provide considerable evidence of the significant effect of water on the microstructure of bulk asphalt.…”

Section: Introductionmentioning

confidence: 99%

“…12,13 Moreover, the presence of water accelerates the structural collapse of asphalt undergoing ultraviolet or thermal aging. 14,16,17 The morphological characteristics of the asphalt surface is covered by several irregular cracks and crooked ridges and rapidly eroded beyond recognition. These observations provide considerable evidence of the significant effect of water on the microstructure of bulk asphalt.…”

Section: Introductionmentioning

confidence: 99%

Multiscale Investigation of Moisture-Induced Structural Evolution in Asphalt–Aggregate Interfaces and Analysis of the Relevant Chemical Relationship Using Atomic Force Microscopy and Molecular Dynamics

et al. 2020

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Chemical changes and intermolecular interactions in asphalt dominate the molecular reorganization and cause the evolution of micro- and mesostructures. Given the lack of knowledge regarding the molecular chemistry–microstructure relationship of the asphalt–aggregate interface, the moisture-induced adhesive failure occurring at this interface has not been fully understood. This study investigates the multiscale structures of the asphalt–aggregate interfaces exposed to water and establishes the relationship between the structures and molecular interactions. The meso- and micromorphologies of two types of treated interfacial asphalts were observed via optical microscopy and atomic force microscopy. The results show an undulated surface and boundary retreat in asphalts because of the overall interfacial tension. Dispersed microbumps measuring tens of nanometers in height progressively grow until they merge into large bumps with increasing water exposure depending on the types of asphalt and aggregates. Fourier transform infrared (FTIR) spectrometry results show enriched polar components at the surface of the treated interfacial asphalt and water diffusion driven by complex intermolecular forces. The molecular behavior simulated by molecular dynamics calculations reveals that aliphatic molecules amalgamate into nonpolar clusters, while polar molecules migrate out and act as a surfactant to stabilize the asphalt–water system driven by the interfacial tension gradient. Internal coalescence of nonpolar components results in protrusion of the asphalt’s surface, and the migration of polar components to the surface accounts for the increased absorption peaks of the polar groups. This phenomenon could explain the FTIR spectra and formation of microbumps. The state of absorbed water and nanostructures of the interfacial asphalt are dominated by intermolecular interactions among asphalt, water, and aggregates. This study provides deep insights into the structural evolution of asphalt from the chemical and molecular perspectives.

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Microstructural Evolution of Asphalt Binder under Combined Action of Moisture and Pressure

Cited by 7 publications

References 20 publications

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Rheological, physicochemical, and microstructural properties of asphalt binder modified by fumed silica nanoparticles

Investigation of Surface Micro-Mechanical Properties of Various Asphalt Binders Using AFM

Multiscale Investigation of Moisture-Induced Structural Evolution in Asphalt–Aggregate Interfaces and Analysis of the Relevant Chemical Relationship Using Atomic Force Microscopy and Molecular Dynamics

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