Influence of the Microwave Heating Time on the Self-Healing Properties of Asphalt Mixtures

This paper aims to evaluate the influence of the microwave heating time on the self-healing properties of fibre-reinforced asphalt mixtures. To this purpose, self-healing properties of dense asphalt mixtures with four different percentages of steel wool fibres were evaluated as the three-point bending strength before and after healing via microwave heating at four different heating times. Furthermore, the thermal behaviour of asphalt mixtures during microwave heating was also evaluated. With the aim of quantifying the efficiency of the repair process, ten damage-healing cycles were done in the test samples. In addition, self-healing results were compared with the fibre spatial distribution inside asphalt samples evaluated by CT-scans. Crack-size change on asphalt samples during healing cycles was also evaluated through optical microscopy. It was found that the heating time is the most influential variable on the healing level reached by the asphalt mixtures tested by microwave radiation. CT-Scans results proved that fibre spatial distribution into the asphalt mixtures play an important role in the asphalt healing level. Finally, it was concluded that 40 s was the optimum heating time to reach the highest healing levels with the lowest damage on the asphalt samples, and that heating times over 30 s can seal the cracks, thus achieving the self-healing of asphalt mixtures via microwave heating.

[1]  Martin van de Ven,et al.  A simple model to define induction heating in asphalt mastic , 2012 .

[2]  Ning Li,et al.  Investigation of rheological and fatigue properties of asphalt mixtures containing polyester fibers , 2008 .

[3]  R. Collin.  Foundations for microwave engineering , 1966 .

[4]  Bradley J. Putman,et al.  Utilization of waste fibers in stone matrix asphalt mixtures , 2004 .

[5]  Pooyan Ayar,et al.  The healing capability of asphalt pavements: a state of the art review , 2016 .

[6]  Manfred N. Partl,et al.  Influence of Steel Wool Fibers on the Mechanical, Termal, and Healing Properties of Dense Asphalt Concrete , 2014 .

[7]  Erik Schlangen,et al.  Induction heating of mastic containing conductive fibers and fillers , 2011 .

[8]  Shaopeng Wu,et al.  Microwave Heating of Steel Slag Asphalt Mixture , 2014 .

[9]  Rebecca Lynn Fitzgerald,et al.  Novel Applications of Carbon Fiber for Hot Mix Asphalt Reinforcement and Carbon-Carbon Pre-forms , 2000 .

[10]  Alvaro Garcia.  Self-healing of open cracks in asphalt mastic , 2012 .

[11]  Young-Kyu Choi,et al.  State of the Art Report on Moisture Sensitivity Test Methods for Bituminous Pavement Materials , 2002 .

[12]  Rodrigo Delgadillo,et al.  Asphalt Technology in Chile: Leading Research and Practice , 2012 .

[13]  Juan Gallego,et al.  Heating asphalt mixtures with microwaves to promote self-healing , 2013 .

[14]  Manfred N. Partl,et al.  Induction healing of dense asphalt concrete , 2013 .

[15]  Gordon Airey,et al.  State of the Art Report on Ageing Test Methods for Bituminous Pavement Materials , 2003 .

[16]  Ted S. Vinson,et al.  Prediction of Low-Temperature Cracking of Asphalt Concrete Mixtures with Thermal Stress Restrained Specimen Test Results , 1996 .

[17]  S. M. Abtahi,et al.  Fiber-reinforced asphalt-concrete – A review , 2010 .

[18]  Moises Bueno,et al.  Single and multiple healing of porous and dense asphalt concrete , 2015 .

[19]  Erik Schlangen,et al.  Effect of fibres addition on the physical and mechanical properties of asphalt mixtures with crack-healing purposes by microwave radiation , 2016 .

[20]  Gerald J. Malasheskie,et al.  FIELD PERFORMANCE OF FABRICS AND FIBERS TO RETARD REFLECTIVE CRACKING , 1989 .

[21]  Ramzi Taha,et al.  Evaluation of Open-graded Friction Course Mixtures Containing Cellulose Fibers and Styrene Butadiene Rubber Polymer , 2005 .

[22]  Q. Liu,et al.  Induction Healing of Porous Asphalt Concrete , 2012 .

[23]  Shaopeng Wu,et al.  Investigation of the conductivity of asphalt concrete containing conductive fillers , 2005 .

[24]  Alvaro Garcia,et al.  Self-healing of asphalt mixture by microwave and induction heating , 2016 .