Microstructural behavior of the low-temperature cracking and self-healing of asphalt mixtures based on the discrete element method

2022 ◽  
Vol 55 (1) ◽  
Author(s):  
Haitao Zhang ◽  
Hailin Liu ◽  
Weiqun You
Keyword(s):  
Low Temperature ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Asphalt Mixtures ◽  
Self Healing ◽  
Low Temperature Cracking ◽  
Microstructural Behavior ◽  
Element Method

scholarly journals Investigating the Functions of Particles in Packed Aggregate Blend using a Discrete Element Method

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 556 ◽  
Author(s):  
Yinghao Miao ◽  
Weixiao Yu ◽  
Yue Hou ◽  
Liyan Guo ◽  
Linbing Wang
Keyword(s):  
Discrete Element Method ◽  
Mechanical Characteristics ◽  
Asphalt Mixture ◽  
Discrete Element ◽  
Asphalt Mixtures ◽  
Coarse Aggregates ◽  
And Function ◽  
Skeleton Structure ◽  
Element Method ◽  
Aggregate Particles

In asphalt mixture, aggregates account for up to 90% of the total volume and play an important role in the mechanical characteristics of asphalt mixture. The proportions of fine and coarse aggregates in gradation, as well as the function of aggregate particles, are important factors for the skeleton structure performance of asphalt mixtures. However, the existing asphalt mixture design methods are mostly based on empirical methods, where the non-uniformity and complexity of the composition of asphalt mixtures are not fully studied. In this study, the skeleton structure of aggregate mixture and function of aggregate are studied and analyzed using the Discrete Element Method (DEM). The Particle Flow 3D (PFC3D) DEM program is used to perform the numerical simulation. The average contact number and interaction forces by aggregate particles of different sizes are obtained and studied. The skeleton structure of aggregate mixture and function of aggregate particles are further analyzed from the meso-structural perspective.

Modeling microcapsule-enabled self-healing cementitious composite materials using discrete element method

2017 ◽  
Vol 26 (2) ◽  
pp. 340-357 ◽  
Author(s):  
Shuai Zhou ◽  
Hehua Zhu ◽  
J Woody Ju ◽  
Zhiguo Yan ◽  
Qing Chen
Keyword(s):  
Discrete Element Method ◽  
Healing Process ◽  
Compressive Loading ◽  
Discrete Element ◽  
Cementitious Materials ◽  
Self Healing ◽  
Healing Effect ◽  
Healing Agent ◽  
Damage Healing ◽  
Element Method

Concrete with a micro-encapsulated healing agent is appealing due to its self-healing capacity. The discrete element method (DEM) is emerging as an increasingly used approach for investigating the damage phenomenon of materials at the microscale. It provides a promising way to study the microcapsule-enabled self-healing concrete. Based on the experimental observation and DEM, a three-dimensional damage-healing numerical model of microcapsule-enabled self-healing cementitious materials under compressive loading is proposed. The local healing effect can be simulated in our model, as well as the stress concentration effect and the partial healing effect. The healing variable of the DEM model is developed to describe the healing process. We examine the dependence of the mechanical properties of the microcapsule-enabled self-healing material on (a) the stiffness of the solidified healing agent, (b) the strength of the solidified healing agent, (c) the initial damage of specimens, and (d) the partial healing effect. In particular, the proposed numerical damage-healing model demonstrates the potential capability to explain and simulate the physical behavior of microcapsule-enabled self-healing materials on the microscale.

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