4.7 Article

Solubility and structural parameters of asphaltene subfractions separated from bitumen via an improved method

Related references

Note: Only part of the references are listed.
Article Energy & Fuels

Applicability and structural relevance of Hansen solubility parameters for asphaltenes

Maolin Li et al.

Summary: In this study, the Hansen solubility parameters of different asphaltenes were determined, and it was found that these parameters can effectively indicate the strength of interactions between asphaltenes. The study also revealed the applicability of using Hansen solubility parameters in systems involving asphaltenes.
Article Construction & Building Technology

Toward a better understanding of the low-temperature reversible aging phenomenon in asphalt binder

Yanjun Qiu et al.

Summary: This paper compares the effects of oxidation and isothermal conditioning on the low-temperature properties of asphalt binder. The results show that both oxidation and isothermal conditioning increase the amount of crystalline and rigid amorphous phases in asphalt.

INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING (2022)

Article Construction & Building Technology

Non-isothermal low-temperature reversible aging of commercial wax-based warm mix asphalts

Qiu Yanjun et al.

Summary: This study investigates the influence of wax-based warm additive on low-temperature reversible aging of asphalt binders under non-isothermal conditioning. Tests including simplified extended bending beam rheometer (Ex-BBR), non-isothermal rheological analysis, and differential scanning calorimetry (DSC) were conducted on asphalt binders containing different commercial wax modifiers. The results show that all commercial waxes accelerate the physical hardening of unaged asphalt binders. Oxidative aging has a greater impact on the low-temperature reversible aging properties compared to wax-based warm mix additive. The base asphalt exhibits the highest phase angle value while F-T wax modified asphalt has the lowest value. The crystallizable fraction increases with decreasing cooling rate. The magnitude of Ozawa exponent follows the same order as grade loss for PAV aged sample. However, no clear rule is observed for unaged asphalt binders.

INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING (2022)

Article Construction & Building Technology

Effects of crystalline wax and asphaltene on thermoreversible aging of asphalt binder

Haibo Ding et al.

Summary: This study investigated the effects of adding C20H42 wax on the thermoreversible aging properties of asphalt binder, finding that it can improve the low-temperature rheological properties and reduce thermal stresses to a certain extent. However, the impact on thermoreversible aging was not significant.

INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING (2022)

Article Energy & Fuels

Influence of asphaltene structural parameters on solubility

Ronald Nguele et al.

Summary: This paper investigates the influence of asphaltene's structural parameters, including aromatic sheet diameter and aromaticity, on its solubility. The results show that aromatic sheet diameter increases with aromaticity and is inversely proportional to hydrogen bonding capability. In terms of dispersant polarity, 7C-7C interactions dominate and contribute to better asphaltene stability, while nonpolar precipitants exhibit the opposite trend. The study suggests the use of polar inhibitors to inhibit the aggregation of asphaltene with large aromatic sheet diameter.
Review Construction & Building Technology

Wax in Asphalt: A comprehensive literature review

Jen Kovinich et al.

Summary: This article reviews the early research on wax in asphalt and provides new insights into its physical and chemical properties using modern characterization methods. It systematically discusses the advantages and disadvantages of different quantification methods for wax content. The potential effects of wax on asphalt performance and existing specification shortcomings are summarized. The current status of wax-based warm-mix additives in pavement engineering is also analyzed.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Article Energy & Fuels

Separation of wax fraction in asphalt binder by an improved method and determination of its molecular structure

Haibo Ding et al.

Summary: This study focuses on the separation of crystalline wax from asphalt binder to improve the low temperature performance of asphalt pavement. The optimal eluted solvents were determined by solubility parameters, and a reduced pressure column chromatography method was developed. The experiments showed improved efficiency and accuracy, with higher repeatability and recovery of saturates and aromatics. The molecular structures of the wax fraction were determined using various analysis methods, providing a compositional mechanism explanation for the physical hardening of the asphalt binder at low temperatures.
Article Construction & Building Technology

Rheological properties of model wax doped asphalt binders

Han Liu et al.

Summary: This study investigated the effects of three kinds of pure wax on the rheological properties of asphalt binder. The results showed that waxes have varying influences on the high-temperature rutting, medium temperature fatigue, and low-temperature thermoreversible aging of asphalt.

CONSTRUCTION AND BUILDING MATERIALS (2022)

Article Energy & Fuels

In-depth characterization of light, medium and heavy oil asphaltenes as well as asphaltenes subfractions

Marziyeh Salehzadeh et al.

Summary: This research provides extensive analysis on the structure of asphaltenes extracted from different oils, with a focus on their stability. The results showed that heavy oil asphaltenes and the most soluble subfraction have higher hydrogen content and hydrogen/carbon atomic ratio, and lower aromatic nature and olefinic entities. Furthermore, the molecular structure of heavy oil asphaltenes and the most soluble subfraction also exhibited differences.
Article Construction & Building Technology

Direct Observation of Crystalline Wax in Asphalt Binders by Variable-Temperature Polarizing Microscope

Haibo Ding et al.

Summary: This paper investigates the influence of crystalline wax on the low-temperature performance of asphalt pavement and the composition of phase separation at the microscopic scale. It is demonstrated that the reflected polarization system of a microscope is the best method to observe the morphology of crystalline wax. The study validates the components of phase separation and shows that aging increases intermolecular force and solubility of wax in the asphalt binder. Additionally, low temperature reduces the solubility of wax in the asphalt binder, leading to the formation of crystalline wax, which explains the physical aging of the asphalt binder at low temperature.

JOURNAL OF MATERIALS IN CIVIL ENGINEERING (2022)

Article Construction & Building Technology

Another look at the use of modulated differential scanning calorimetry to study thermoreversible aging phenomena in asphalt binders

Haibo Ding et al.

Summary: Thermoreversible aging of asphalt is an important attribute that affects durability of flexible pavements. The aging process strongly depends on composition and particularly wax content. Binders produced from oil sands-derived crude oil with low wax contents benefit overall life cycle costs and improve the sustainability of the road building industry.

CONSTRUCTION AND BUILDING MATERIALS (2021)

Article Construction & Building Technology

Thermoreversible aging in model asphalt binders

Haibo Ding et al.

Summary: This research focuses on the impact of different pure waxes in asphalt binders on thermoreversible aging, finding that eicosane improves low-temperature performance but exacerbates thermoreversible aging. The branching of straight-chain hydrocarbons can enhance low-temperature performance without worsening thermoreversible aging. Limiting phase angle temperature is more sensitive to C30 and squalane additives.

CONSTRUCTION AND BUILDING MATERIALS (2021)

Article Chemistry, Multidisciplinary

Determining the Sustainable Component of Wax-Based Warm Mix Additives for Improving the Cracking Resistance of Asphalt Binders

Haopeng Zhang et al.

Summary: The cracking resistance of asphalt binder is crucial for the durability of asphalt pavements and wax-based warm mix additives aim to enhance this property. Different types of wax additives have varying effects on the cracking resistance, with long-chain molecules improving high-temperature performance and short-chain molecules enhancing ductile fracture resistance. The recommended optimum carbon number range for wax-based additives is C-40 to C-60, determined through a combination of microscopic and macroscopic testing methods.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2021)

Article Thermodynamics

Modulated differential scanning calorimetry study of wax-doped asphalt binders

Jen Kovinich et al.

Summary: This study utilized MDSC analysis to investigate the impact of adding n-alkanes to asphalt binders, finding that it alters the thermal behavior of the asphalt, with varying effects depending on the type of n-alkane used. As the wax oxidizes, the heat flow peaks in the asphalt decrease, and the crystallizable fractions can be modeled using different theoretical frameworks.

THERMOCHIMICA ACTA (2021)

Article Chemistry, Multidisciplinary

Balancing the Use of Wax-Based Warm Mix Additives for Improved Asphalt Compaction with Long-Term Pavement Performance

Haibo Ding et al.

Summary: The study found that using wax-based additives can reduce gas emissions in asphalt construction, but excessive use may affect the pavement's durability. By analyzing the spectral and thermal properties, the effects of additives on asphalt can be determined.

ACS SUSTAINABLE CHEMISTRY & ENGINEERING (2021)

Review Energy & Fuels

Structure-Dynamic Function Relations of Asphaltenes

Linzhou Zhang et al.

Summary: Asphaltene molecular and nanocolloidal structures have been elucidated, allowing for the development of structure-function relationships. Advanced microscopy techniques have provided insights into the molecular structures of asphaltenes, confirming previous findings and providing a foundation for thermodynamic treatment of crude oils. Recent results have impacted evaluation of heavy oil refining and hydrotreatment processes, showing excellent agreement between modeling and experiment.

ENERGY & FUELS (2021)

Article Construction & Building Technology

Using combined Avrami-Ozawa method to evaluate low-temperature reversible aging in asphalt binders

Yanjun Qiu et al.

ROAD MATERIALS AND PAVEMENT DESIGN (2020)

Article Construction & Building Technology

Influence of thermal history on the intermediate and low-temperature reversible aging properties of asphalt binders

Haibo Ding et al.

ROAD MATERIALS AND PAVEMENT DESIGN (2020)

Article Construction & Building Technology

Low-Temperature Reversible Aging Properties of Selected Asphalt Binders Based on Thermal Analysis

Haibo Ding et al.

JOURNAL OF MATERIALS IN CIVIL ENGINEERING (2019)

Review Energy & Fuels

A comprehensive review on the recent advances on the petroleum asphaltene aggregation

Zeeshan Rashid et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2019)

Article Chemistry, Multidisciplinary

Characterizing aliphatic moieties in hydrocarbons with atomic force microscopy

Bruno Schuler et al.

CHEMICAL SCIENCE (2017)

Article Construction & Building Technology

Impact of maltene and asphaltene fraction on mechanical behavior and microstructure of bitumen

B. Hofko et al.

MATERIALS AND STRUCTURES (2016)

Article Construction & Building Technology

Influence of waxes on adhesion properties of bituminous binders

Riccardo Lamperti et al.

CONSTRUCTION AND BUILDING MATERIALS (2015)

Article Chemistry, Multidisciplinary

Unraveling the Molecular Structures of Asphaltenes by Atomic Force Microscopy

Bruno Schuler et al.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2015)

Article Construction & Building Technology

Influence of asphaltene content on mechanical bitumen behavior: experimental investigation and micromechanical modeling

Lukas Eberhardsteiner et al.

MATERIALS AND STRUCTURES (2015)

Article Chemistry, Applied

Chemical characterization of asphaltenes from various crude oils

Carolina Leyva et al.

FUEL PROCESSING TECHNOLOGY (2013)

Article Energy & Fuels

Raman Spectrum of Asphaltene

Wael A. Abdallah et al.

ENERGY & FUELS (2012)

Article Construction & Building Technology

Asphaltenes in Bitumen, What They Are and What They Are Not

Per Redelius

Road Materials and Pavement Design (2012)

Article Energy & Fuels

The Modified Yen Model

Oliver C. Mullins

ENERGY & FUELS (2010)

Article Construction & Building Technology

On the existence of wax-induced phase separation in bitumen

Alexander Schmets et al.

INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING (2010)

Article Engineering, Petroleum

Review of the molecular structure and aggregation of asphaltenes and petroleomics

Oliver C. Mullins

SPE JOURNAL (2008)

Article Engineering, Chemical

Characterization of asphaltene fractions from hydrotreated maya crude oil

Fernando Trejo et al.

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH (2007)

Article Energy & Fuels

Reversible aging in asphalt binders

Simon A. M. Hesp et al.

ENERGY & FUELS (2007)

Article Energy & Fuels

Effect of asphaltenes on crude oil wax crystallization

P Kriz et al.

ENERGY & FUELS (2005)

Article Energy & Fuels

Steric hardening and the ordering of asphaltenes in bitumen

JF Masson et al.

ENERGY & FUELS (2005)

Article Energy & Fuels

Bitumen solubility model using Hansen solubility parameter

P Redelius

ENERGY & FUELS (2004)

Article Energy & Fuels

Bitumen structural stability characterization using turbidimetric titration

R Karlsson et al.

ENERGY & FUELS (2003)

Article Energy & Fuels

Solubility parameters and bitumen

PG Redelius