scholarly journals A novel self-healing system: Towards a sustainable porous asphalt

2020 ◽  
Vol 259 ◽  
pp. 120815 ◽  
Author(s):  
S. Xu ◽  
X. Liu ◽  
A. Tabaković ◽  
E. Schlangen
Keyword(s):  
Self Healing ◽  
Porous Asphalt ◽  
Healing System

scholarly journals Experimental Investigation of the Performance of a Hybrid Self-Healing System in Porous Asphalt under Fatigue Loadings

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3415
Author(s):  
Shi Xu ◽  
Xueyan Liu ◽  
Amir Tabaković ◽  
Erik Schlangen
Keyword(s):  
Fatigue Life ◽  
Fatigue Test ◽  
Rest Period ◽  
Life Extension ◽  
Fatigue Properties ◽  
Self Healing ◽  
Porous Asphalt ◽  
Healing Effect ◽  
Healing System ◽  
Healing Efficiency

Self-healing asphalt, which is designed to achieve autonomic damage repair in asphalt pavement, offers a great life-extension prospect and therefore not only reduces pavement maintenance costs but also saves energy and reduces CO2 emissions. The combined asphalt self-healing system, incorporating both encapsulated rejuvenator and induction heating, can heal cracks with melted binder and aged binder rejuvenation, and the synergistic effect of the two technologies shows significant advantages in healing efficiency over the single self-healing method. This study explores the fatigue life extension prospect of the combined healing system in porous asphalt. To this aim, porous asphalt (PA) test specimens with various healing systems were prepared, including: (i) the capsule healing system, (ii) the induction healing system, (iii) the combined healing system and (iv) a reference system (without extrinsic healing). The fatigue properties of the PA samples were characterized by an indirect tensile fatigue test and a four-point bending fatigue test. Additionally, a 24-h rest period was designed to activate the built-in self-healing system(s) in the PA. Finally, a damaging and healing programme was employed to evaluate the fatigue damage healing efficiency of these systems. The results indicate that all these self-healing systems can extend the fatigue life of porous asphalt, while in the combined healing system, the gradual healing effect of the released rejuvenator from the capsules may contribute to a better induction healing effect in the damaging and healing cycles.

scholarly journals Influencing Factors on the Healing Performance of Microcapsule Self-Healing Concrete

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4139
Author(s):  
Yanju Wang ◽  
Zhiyang Lin ◽  
Can Tang ◽  
Wenfeng Hao
Keyword(s):  
Compressive Strength ◽  
Sodium Silicate ◽  
Recovery Rate ◽  
Sound Speed ◽  
Orthogonal Experimental Design ◽  
Self Healing ◽  
Damage Degree ◽  
Strength Recovery ◽  
Healing System ◽  
Recovery Performance

The amounts of the components in a microcapsule self-healing system significantly impact the basic performance and self-healing performance of concrete. In this paper, an orthogonal experimental design is used to investigate the healing performance of microcapsule self-healing concrete under different pre-damage loads. The strength recovery performance and sound speed recovery performance under extensive damage are analyzed. The optimum factor combination of the microcapsule self-healing concrete is obtained. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) are carried out on the concrete samples before and after healing to determine the healing mechanism. The results show that the healing effect of self-healing concrete decreases with an increase in the pre-damage load, and the sound speed recovery rate increases with an increase in the damage degree. The influence of the sodium silicate content on the compressive strength and compressive strength recovery rate of the self-healing concrete increases, followed by a decrease. The optimum combination of factors of the microcapsule self-healing system is 3% microcapsules, 30% sodium silicate, and 15% sodium fluosilicate. The results can be used for the design and preparation of self-healing concrete.

Laboratory Investigation of the Adhesion and Self-Healing Properties of High-Viscosity Modified Asphalt Binders

2020 ◽  
Vol 2674 (1) ◽  
pp. 307-318 ◽  
Author(s):  
Mingjun Hu ◽  
Daquan Sun ◽  
Tong Lu ◽  
Jianmin Ma ◽  
Fan Yu
Keyword(s):  
Water Immersion ◽  
Gel Permeation Chromatography ◽  
High Viscosity ◽  
Healing Time ◽  
Adhesion Property ◽  
Asphalt Binders ◽  
Self Healing ◽  
Porous Asphalt ◽  
Modified Asphalt ◽  
Water Damage

Water damage often occurs on porous asphalt pavement during service life because of the well-developed pore structure. Determining the adhesion and adhesion healing properties of high-viscosity modified asphalt (HVMA) under water condition is beneficial to understand the water damage process of porous asphalt. In this study, the modified binder bond strength test was first conducted to investigate the adhesion property and self-healing behavior of HVMA at different conditions. Then, the surface energy test was carried out to further characterize the differences in adhesion property of HVMA. Moreover, the gel permeation chromatography test and fluorescence microscopic test were used to investigate the influence of chemical composition and polymer morphology on the adhesion property of HVMA. Results show that the presence of water reduces the adhesion property of HVMA. The addition of polymers leads to an increasing adhesion strength and a decreasing self-healing ability of HVMA. The self-healing ability of HVMA improves with the increase of temperature, but also shows a decreased trend when the healing time is long at high-temperature water immersion. The effect of polymers on the adhesion property of asphalt has two aspects. First, the swelling of polymers leads to an increasing content of polar heavy components in HVMA, thus enhancing polarity adsorption between asphalt and aggregate. Moreover, a polymer-centered interfacial diffusion layer can be formed during the adsorption of light components, which increases the overlapping area of structural asphalt between adjacent aggregates. This can also improve the adhesion property at the asphalt–aggregate interface.

A probabilistic approach for design and certification of self-healing advanced composite structures

2011 ◽  
Vol 225 (4) ◽  
pp. 435-449 ◽  
Author(s):  
H R Williams ◽  
R S Trask ◽  
I P Bond
Keyword(s):  
Composite Structures ◽  
High Performance ◽  
Probabilistic Approach ◽  
Healing Time ◽  
Self Healing ◽  
Structural Failure ◽  
Healing System ◽  
Order Of Magnitude ◽  
Damage Tolerant

Design and certification of novel self-healing aerospace structures was explored by reviewing the suitability of conventional deterministic certification approaches. A sandwich structure with a vascular network self-healing system was used as a case study. A novel probabilistic approach using a Monte Carlo method to generate an overall probability of structural failure yields notable new insights into design of self-healing systems, including a drive for a faster healing time of less than two flight hours. In the case study considered, a mature self-healing system could be expected to reduce the probability of structural failure (compared to a conventional damage-tolerant construction) by almost an order of magnitude. In a risk-based framework this could be traded against simplified maintenance activity (to save cost) and/or increased allowable stress (to allow a lighter structure). The first estimate of the increase in design allowable stresses permitted by a self-healing system is around 8 per cent, with a self-healing system much lighter than previously envisaged. It is thought these methods and conclusions could have wider application to self-healing and conventional high-performance composite structures.

Full Recovery of Fracture Toughness Using a Nontoxic Solvent‐Based Self‐Healing System

2008 ◽  
Vol 18 (13) ◽  
pp. 1898-1904 ◽  
Author(s):  
Mary M. Caruso ◽  
Benjamin J. Blaiszik ◽  
Scott R. White ◽  
Nancy R. Sottos ◽  
Jeffrey S. Moore
Keyword(s):  
Fracture Toughness ◽  
Full Recovery ◽  
Self Healing ◽  
Healing System

Integrated Sensing, Monitoring and Healing of Composite Systems

2016 ◽  
Vol 101 ◽  
pp. 62-68
Author(s):  
Oluwafemi Sedoten Kuponu ◽  
Visakan Kadirkamanathan ◽  
Bishakh Bhattacharya ◽  
Simon Alexander Pope
Keyword(s):  
Composite Materials ◽  
Failure Rate ◽  
Feedback Loop ◽  
Healing Rate ◽  
Research Community ◽  
Self Healing ◽  
Thin Line ◽  
Composite Systems ◽  
Damage Rate ◽  
Healing System

The ability of a material to recover its nominal properties through self-healing is gaininginterest in the research community. However, current approaches remain predominantly passive incounteracting the effect of damage. As a result, healing only begins when the material has occurreddamage and typically there is a mismatch between the healing and damage rate. For applications suchas aircraft, where there is a thin line between functionality and non-functionality, these limitations maybe inherently restrictive. A self-healing system that combines a prognosis unit to predict and estimatethe failure rate and an active self-healing system that matches the healing rate to the estimated failurerate using a feedback loop, has the potential to overcome these limitations. In this paper we proposesuch a system and present results for its application to composite materials.

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