Evaluation of Self-Healing Performance of Asphalt Concrete for Macrocracks via Microwave Heating

2020 ◽  
Vol 32 (9) ◽  
pp. 04020248 ◽  
Author(s):  
Hongzhou Zhu ◽  
Hai Yuan ◽  
Yufeng Liu ◽  
Shiping Fan ◽  
Yongjie Ding
Keyword(s):  
Microwave Heating ◽  
Asphalt Concrete ◽  
Self Healing

Watertightness, cracking resistance, and self-healing of asphalt concrete used as a water barrier in dams

2013 ◽  
Vol 50 (3) ◽  
pp. 275-287 ◽  
Author(s):  
Yingbo Zhang ◽  
Kaare Höeg ◽  
Weibiao Wang ◽  
Yue Zhu
Keyword(s):  
Asphalt Concrete ◽  
Leakage Rate ◽  
Strain Rates ◽  
Self Healing ◽  
Test Results ◽  
Direct Tension ◽  
Coefficient Of Permeability ◽  
Tension Tests ◽  
Laboratory Test Results ◽  
Cracked Specimens

The coefficient of permeability of hydraulic asphalt concrete is in the range 10−8–10−10 cm/s. Laboratory test results show that triaxial specimens in axial compression can undergo axial strains up to 18% without any significant increase in permeability until approaching the compressive strength. For temperatures between 5 and 20 °C and strain rates between 2 × 10−3%/s and 5 × 10−3%/s, conventional hydraulic asphalt concrete can tolerate 1%–3% tensile strains before cracking in direct tension tests and strains up to 3%–4% in bending. At 20 °C the tensile and bending strains at cracking are 2–4 times higher than those at 0 °C, and at −20 °C they are approximately 0.2% and 0.8%, respectively. Asphalt concrete possesses pronounced crack self-healing properties. In the experiments, the crack leakage rate dropped 1–4 orders of magnitude within a few hours and the cracked specimens regained 55% of the intact tensile strength after only 1 day of self-healing. In summary, the comprehensive series of laboratory tests documents that asphalt concrete has characteristics that make the material extremely well suited for use in impervious barriers in dams, and the test results reported herein can be of great use in barrier design.

scholarly journals Self-healing capability of asphalt concrete with carbon-based materials

2019 ◽  
Vol 8 (1) ◽  
pp. 827-839 ◽  
Author(s):  
Doo-Yeol Yoo ◽  
Soonho Kim ◽  
Min-Jae Kim ◽  
Doyeong Kim ◽  
Hyun-Oh Shin
Keyword(s):  
Asphalt Concrete ◽  
Self Healing ◽  
Carbon Based

Addressing durability of asphalt concrete by self-healing mechanism

2015 ◽  
pp. 453-461
Author(s):  
R Barrasa ◽  
V López ◽  
C Montoliu ◽  
V Ibáñez ◽  
F Pedrajas ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Self Healing

scholarly journals Evaluation of self-healing of asphalt concrete through induction heating and metallic fibers

2017 ◽  
Vol 146 ◽  
pp. 66-75 ◽  
Author(s):  
Yashwanth Pamulapati ◽  
Mostafa A. Elseifi ◽  
Samuel B. Cooper ◽  
Louay N. Mohammad ◽  
Omar Elbagalati
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Self Healing ◽  
Metallic Fibers

Two Ways of Closing Cracks on Asphalt Concrete Pavements: Microcapsules and Induction Heating

2009 ◽  
Vol 417-418 ◽  
pp. 573-576 ◽  
Author(s):  
Alvaro Garcia ◽  
Erik Schlangen ◽  
Martin Van de Ven
Keyword(s):  
Induction Heating ◽  
Asphalt Concrete ◽  
Healing Rate ◽  
Local Heating ◽  
The Other ◽  
Concrete Pavements ◽  
Self Healing ◽  
Accumulated Damage ◽  
Conductive Particles ◽  
Induction Energy

It is well known that asphalt concrete is a self healing material: immediately after both faces of a crack are in contact, the diffusion of molecules from one face to the other starts. If there are no more loads, this process takes place until the crack has completely disappeared and the material has recovered its original resistance [1]. To increase this healing rate two methods are proposed. The first one is a passive self-healing mechanism. Embedded encapsulated chemicals are used in the binder. When microcracks start appearing in the binder due to the combination of ageing and accumulated damage, they break the capsules and the chemicals enter the binder by diffusion. These chemicals repair the material, decreasing the stiffness and increasing the healing rates of bitumen. The second approach makes use of an active self healing mechanism. Local heating inside the material is used to repair the binder and to improve the properties again. This is realized by adding conductive particles to the binder and using induction energy to increase the temperature. These methods are a fairly new concept in the asphalt industry.

scholarly journals Addressing Durability of Asphalt Concrete by Self-healing Mechanism

2014 ◽  
Vol 162 ◽  
pp. 188-197 ◽  
Author(s):  
Raquel Casado Barrasa ◽  
Víctor Blanco López ◽  
Carlos Martín-Portugués Montoliu ◽  
Verónica Contreras Ibáñez ◽  
Josefina Pedrajas ◽  
...  
Keyword(s):  
Asphalt Concrete ◽  
Self Healing

scholarly journals Induction Heating and Healing Behaviors of Asphalt Concretes Doped with Different Conductive Additives

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Hechuan Li ◽  
Jianying Yu ◽  
Quantao Liu ◽  
Yuanyuan Li ◽  
Yaqi Wu ◽  
...  
Keyword(s):  
High Temperature ◽  
Induction Heating ◽  
Asphalt Concrete ◽  
Healing Rate ◽  
Steel Fiber ◽  
Steel Slag ◽  
Rest Period ◽  
Self Healing ◽  
Heating Efficiency ◽  
Conductive Additives

It is consensual that the self-healing property of asphalt concrete can repair the damage inside it during high temperature and rest period. In order to not affect the traffic, the rest period of asphalt pavement is very short and uncontrollable; so, it is necessary to obtain enough high temperature in a limited time to achieve higher healing efficiency of asphalt concrete. The purpose of this paper is to study the induction heating efficiency and healing behaviors of asphalt concretes doped with different conductive additives. Steel fiber, steel grit, and steel slag were added to asphalt mixtures as conductive additives to prepare induction healing asphalt concretes. The steel grit and steel slag were added to replace the aggregates of corresponding particle size by equal volume to ensure the consistency of asphalt concrete volume, which can avoid degrading the performance of asphalt concrete due to the change of porosity. The induction heating efficiency and healing rate of asphalt concrete were quantified by infrared camera and three-point bending-healing experiment, respectively. The results showed that the thermal properties of asphalt concrete changed with the addition of different conductive additives. The asphalt concrete with steel fiber had the best induction heating property. While steel slag had extremely weak induction heating speed, the better thermal insulation property of the asphalt concrete with steel slag resulted in a higher induction healing rate. It was suggested to add steel slag to induction healing asphalt concrete to improve the healing rate.

Snow and ice melting properties of self-healing asphalt mixtures with induction heating and microwave heating

2018 ◽  
Vol 129 ◽  
pp. 871-883 ◽  
Author(s):  
Yihan Sun ◽  
Shaopeng Wu ◽  
Quantao Liu ◽  
Jianfu Hu ◽  
Yuan Yuan ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Induction Heating ◽  
Asphalt Mixtures ◽  
Self Healing ◽  
Ice Melting ◽  
Melting Properties ◽  
Snow And Ice

Fatigue Life Analysis of Asphalt Mixture Coupling with Loading Intermittent Time

2012 ◽  
Vol 204-208 ◽  
pp. 3852-3858 ◽  
Author(s):  
Li Qiang Luan ◽  
Xiao Ge Tian
Keyword(s):  
Asphalt Concrete ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Asphalt Mixture ◽  
Time Factor ◽  
Repeated Loading ◽  
Self Healing ◽  
Effect Factor ◽  
Higher Temperature ◽  
Fatigue Life Analysis

Repeated loading will produce cumulative damage to asphalt concrete, because of the visco-elastic property of asphalt concrete, a certain degree of self-healing may occurred in case the loads being taken away.( the healing effect is more obvious under higher temperature or pressure),this process can be indicated through adding the intermittent time factor to fatigue test of asphalt concrete .This study adds intermittent time factor to asphalt concrete fatigue testing through universal testing machine,, deeply analyzing the effect of intermittent time, confirming that 0.5 second intermittent time is a key time point to fatigue process ,fatigue rate under 15 °C is slower than that under 20 °C,and introducing the effect factor to the fatigue equation.

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