Related Experiment Video
Updated: Apr 23, 2026
08:03
Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
Published on: May 31, 2022
4.7K
Frequency analysis of stress relaxation dynamics in model asphalts
Mohammad Masoori1, Michael L Greenfield1
1Department of Chemical Engineering, University of Rhode Island, Kingston, Rhode Island 02881, USA.
The Journal of Chemical Physics
|October 3, 2014
Summary
Molecular dynamics simulations reveal how asphalt composition affects its viscoelastic properties. Larger molecules in asphalt lead to higher complex modulus, which decreases with temperature, impacting road performance.
Area of Science:
- Materials Science
- Chemical Engineering
- Computational Chemistry
Background:
- Asphalt's mechanical performance is governed by viscoelasticity.
- Understanding asphalt's chemical composition is crucial for predicting its behavior under stress.
Purpose of the Study:
- To investigate the influence of chemical composition on the viscoelastic properties of model asphalts.
- To compute complex modulus using molecular dynamics simulations for two distinct asphalt models.
Main Methods:
- Employed molecular dynamics simulations to calculate the complex modulus of two model asphalts.
- Analyzed storage and loss modulus, and phase angle variations with temperature and frequency.
Main Results:
- A model asphalt with smaller molecules exhibited Maxwell model scaling limits at 443 K.
- A model asphalt with larger molecules (300-900 g/mol) showed higher complex modulus, decreasing with temperature (400-533 K).
- Black/van Gurp-Palman plots indicated Christensen-Anderson-Marasteanu model consistency for larger molecules.
Conclusions:
- Both model asphalts demonstrate thermorheological complexity at high frequencies.
- Asphalt composition significantly impacts viscoelastic properties, influencing material performance.
- Simulation results provide insights into asphalt behavior and pave the way for improved material design.
Related Concept Videos
01:15Stress: General Loading Conditions
733
To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes....
733
01:13Stress Concentrations
809
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
The stress...
809
01:24Stress Concentrations
829
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
829
01:22Creep in Concrete
1.9K
Creep refers to the time-dependent increase in strain under a sustained load, excluding other time-dependent deformations associated with shrinkage, swelling, and thermal expansion in concrete. The primary mechanism behind creep involves the loss of physically adsorbed water from the calcium silicate hydrate within the hydrated cement paste. This process is further exacerbated by concrete's non-linear stress-strain relationship, microcrack development in the interfacial transition zone, and...
1.9K
01:18Transformation of Plane Stress
898
Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's...
898
01:24Stress-Strain Diagram - Ductile Materials
2.4K
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
2.4K