Effect of steel wool fibers on mechanical and induction heating response of conductive asphalt concrete

This study characterises the mechanical, rheological, induced heating, and induced healing behaviour of asphalt concrete containing steel wool fibers (SWFs) as the conductive constituent. Induced heating of asphalt concrete through the electromagnetic field is a novel method to heal the damage induc...

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Bibliographic Details
Published in:The international journal of pavement engineering 2020-12, Vol.21 (14), p.1755-1768
Main Authors: Karimi, Mohammad M., Darabi, Masoud K., Jahanbakhsh, H., Jahangiri, Behnam, Rushing, John F.
Format: Article
Language:English
Subjects:
Asphalt
Bend strength
Concrete
Conductive asphalt concrete
Conductivity
Corrosion effects
Electromagnetic fields
Electromagnetic induction
Healing
Heating rate
induced micro-damage healing
Induction heating
microwave heating
Product testing
Rheological properties
Rheology
Steel constituents
steel wool fiber (SWF)
Tensile strength
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Summary:This study characterises the mechanical, rheological, induced heating, and induced healing behaviour of asphalt concrete containing steel wool fibers (SWFs) as the conductive constituent. Induced heating of asphalt concrete through the electromagnetic field is a novel method to heal the damage induced in asphalt concrete. Previous studies used high contents of the SWF as the conductive material to improve the sensitivity of the asphalt concrete to the electromagnetic radiations. Experimental tests conducted in this study (e.g. uniaxial strength, indirect tension, semi-circular bending tests) show that the addition of 0.2 (wt)% SWF meets both the heating and healing requirements. The relatively low amount of SWF resulted in considerably less adverse effects on the mechanical and rheological properties of asphalt concrete comparing to higher percentages of SWF (e.g. 1.5 (wt)% of SWF). Tests conducted on different specimen sizes of asphalt concrete reveal substantial effects of specimen dimension (volume) on the heating rate that should be considered in the evaluation of asphalt concrete induction heating under electromagnetic power. In addition, it is shown that using 0.2 (wt)% SWF significantly reduces the effect of corrosion on induced heating of conductive asphalt concrete materials. Experimental results demonstrate that the tensile strength ratio (TSR) decreases from 25% for 1.5% SWF to 7% for 0.2% SWF.
ISSN:1029-8436
1477-268X
DOI:10.1080/10298436.2019.1567918