Related Experiment Video
Updated: Dec 13, 2025
08:03
Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
Published on: May 31, 2022
5.4K
High-Temperature Performance Evaluation of Asphaltenes-Modified Asphalt Binders.
Amirhossein Ghasemirad1, Nura Bala1, Leila Hashemian1
1Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Molecules (Basel, Switzerland)
|July 26, 2020
Summary
Adding asphaltenes to asphalt binder enhances its stiffness and elasticity. This modification improves high-temperature performance, making asphalt binders more durable and cost-effective.
Area of Science:
- Materials Science
- Chemical Engineering
- Civil Engineering
Background:
- Asphalt binder properties are crucial for road performance.
- The SARA (Saturates, Aromatics, Resins, Asphaltenes) fractions influence binder behavior.
- Asphaltenes are key to the viscoelastic properties of asphalt.
Purpose of the Study:
- To investigate the effect of asphaltenes as a modifier on asphalt binder performance.
- To evaluate the changes in rheological and chemical properties of asphalt binders with added asphaltenes.
Main Methods:
- Asphalt binders were modified by adding asphaltenes.
- Modified binders were aged using a rolling thin film oven.
- Rheological properties were measured using a dynamic shear rheometer.
- SARA fractions were determined using precipitation and gravity-driven chromatography.
Main Results:
- Asphaltenes addition improved the stiffness and elasticity of asphalt binders.
- The high Performance Grade (PG) temperature of asphalt binder increased by one interval for every 6% of asphaltenes added.
- Increased polar fraction content, due to asphaltenes, correlated with higher stiffness, elasticity, and viscosity.
Conclusions:
- Asphaltenes are an effective and economical additive for enhancing asphalt binder performance at high temperatures.
- The modification of SARA fractions through asphaltenes addition leads to improved binder properties.
- This research offers a cost-effective solution for improving asphalt binder durability.
Related Concept Videos
01:20Hot Weather Concreting
220
Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
220
01:14Design Example: Managing Concrete Workability
210
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
210
01:22Toughness and Hardness of Aggregate
496
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
496
01:12Bonding and Strength of Aggregate
354
The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
354
01:17Accelerators
186
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
The effectiveness of calcium chloride can...
186
01:21Types of Cement I
276
Portland cement comes in several types, each with distinct properties and applications based on their chemical composition and hydration characteristics:
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
Type I (Ordinary Portland Cement) is widely used for general construction where special properties are not required. It has moderate sulfate resistance and heat of hydration.
Type II (Modified Cement) offers moderate resistance to sulfate attack and a lower rate of heat development compared to Type I. It is suitable for structures in...
276