Evaluation of the induction healing effect of porous asphalt concrete through four point bending fatigue test

Induction healing is a proven technology which is able to improve the self-healing capacity of asphalt concrete. Healing is achieved via electromagnetic current produced by passing induction machine, where steel asphalt constituents heat up which in turn soften the bitumen in the asphalt layer, allowing it to flow and close cracks, repairing the damage. This paper reports on the study which investigated the influence of ageing on the healing capacity of Porous Asphalt (PA) concrete. Porous Asphalt concrete mix was prepared first, then subjected to an accelerated (laboratory) ageing process using a ventilated oven. In order to further evaluate the induction healing efficiency of asphalt concrete, Semi-circular bending (SCB) and healing cycles were performed on asphalt concrete specimens. The results show that with an increase of the ageing level of porous asphalt concrete, the induction healing efficiency decreases.

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BASIC STUDY OF THE CRACK PROPAGATION PROPERTIES OF ASPHALT MIXTURE IN THE FOUR-POINT BENDING FATIGUE TEST

Journal of Japan Society of Civil Engineers Ser E1 (Pavement Engineering) ◽

10.2208/jscejpe.72.i_211 ◽

2016 ◽

Vol 72 (3) ◽

pp. I_211-I_218

Author(s):

Tsutomu OTANI ◽

Yuya YANAGII ◽

Kiyokazu KIMURA ◽

Osamu TAKAHASHI ◽

Tadaaki SHIMIZU

Keyword(s):

Crack Propagation ◽

Fatigue Test ◽

Asphalt Mixture ◽

Basic Study ◽

Bending Fatigue ◽

Four Point Bending ◽

Bending Fatigue Test ◽

Propagation Properties

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Investigate of Performance of Asphalt Concrete with Gneiss

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.417-418.497 ◽

2009 ◽

Vol 417-418 ◽

pp. 497-500 ◽

Cited By ~ 2

Author(s):

Ling Pang ◽

Shao Peng Wu ◽

Jun Xie ◽

De Ming Hu

Keyword(s):

Asphalt Concrete ◽

Asphalt Mixture ◽

Hydrated Lime ◽

Asphalt Mixtures ◽

Processing Property ◽

Bending Fatigue ◽

Tensile Strength Test ◽

Four Point Bending ◽

Bending Fatigue Test ◽

Indirect Tensile

The use of gneiss as aggregates might help meet the pavement constructing demands. However, the study of the pavement performances of gneiss asphalt mixture is few. In this paper, the microstructure of gneiss aggregate was studied by Scanning Electron Microscopy (SEM). And the pavement performances of gneiss asphalt mixture with different improving measure were characterized by means of Indirect Tensile Strength Test and Four-Point Bending Fatigue Test. Gneiss is flaky, surface texture rougher and imporosity characteristic in microstructure, resulting to its adhesion and processing property are poor. Experiment results indicate that the use of hydrated lime replacing limestone power partly in filler can improve pavement properties of the gneiss asphalt mixtures distinctly.

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The Prospect of Microwave Heating: Towards a Faster and Deeper Crack Healing in Asphalt Pavement

Processes ◽

10.3390/pr9030507 ◽

2021 ◽

Vol 9 (3) ◽

pp. 507

Author(s):

Shi Xu ◽

Xueyan Liu ◽

Amir Tabaković ◽

Erik Schlangen

Keyword(s):

Microwave Heating ◽

Asphalt Concrete ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Heating Time ◽

Porous Asphalt ◽

Heating Efficiency ◽

Healing Effect ◽

Uneven Heating ◽

Porous Asphalt Concrete

Microwave heating has been shown to be an effective method of heating asphalt concrete and in turn healing the damage. As such, microwave heating holds great potential in rapid (1–3 min) and effective damage healing, resulting in improvement in the service life, safety, and sustainability of asphalt pavement. This study focused on the microwave healing effect on porous asphalt concrete. Steel wool fibres were incorporated into porous asphalt to improve the microwave heating efficiency, and the optimum microwave heating time was determined. Afterwards, the microwave healing efficiency was evaluated using a semi–circular bending and healing programme. The results show that the microwave healing effect is largely determined by the steel fibre content and the mix design of the porous asphalt concrete.. Besides, the uneven heating effect of microwave contributes to an unstable damage recovery in the asphalt mixture, which makes it less efficient than induction heating. However, microwaves exhibited the ability to penetrate further into the depth of the test specimen and heat beneath the surface, indicating deeper damage recovery prospects.

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The Development of Pneumatic Fatigue Test Rig for Wood-Based Specimens

Forests ◽

10.3390/f11111187 ◽

2020 ◽

Vol 11 (11) ◽

pp. 1187

Author(s):

Gorazd Fajdiga ◽

Denis Rajh ◽

Drago Vidic ◽

Bojan Gospodarič

Keyword(s):

Fatigue Test ◽

Development Process ◽

Dynamic Strength ◽

Test Rig ◽

Bending Fatigue ◽

Four Point Bending ◽

Precise Knowledge ◽

Bending Fatigue Test ◽

Numerical Tools ◽

Load Behavior

In product design, the focus is increasingly shifting towards optimizing and increasing the efficiency of the development process. This can be achieved with advanced numerical tools, but these methods require precise knowledge of material properties. One of the desired properties is the dynamic load behavior of the material. The research is directly related with the company that developed the slender wooden beams used in industry to produce windows of larger dimensions (height over 3 m). For the testing of wooden beams, the pneumatic four-point bending fatigue test rig was developed. In this paper, the whole structure of the test rig is described in detail. Based on the performed experiments of dynamic strength, the Woehler curve was determined, which serves as a necessary input for further numerical simulation of the fatigue process of wood-based beams. Knowledge of the response of wood to dynamic loads is very important to predict its life expectancy in various products.

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