Comparison of the effect of accelerated curing with post-construction induction heating and natural curing on the self-healing index of cold asphalt mixture

Document Type : Research Paper

Authors

1 MSc. Student in Civil Engineering, Road and Transportation Engineering, Semnan University, Semnan, I. R. Iran.

2 Professor, Department of Road and Transportation, Faculty of Civil Engineering, Semnan University, Semnan, I. R. Iran.

3 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, University of Guilan, Rasht, I. R. Iran.

Abstract

Cold asphalt has drawbacks such as lower shear strength due to poor adhesion between bitumen and aggregates (caused by insufficient heating during production), limiting its use on high-traffic roads. Additionally, the weak bond between bitumen and aggregates leads to faster crack initiation and propagation in these pavements. The primary objective of this research is to compare the self-healing capacity of cold asphalt cured with post-construction electromagnetic induction heating and cold asphalt cured using the conventional method. For the laboratory specimens, siliceous aggregates, 63-micron iron powder (as an induction agent), cationic emulsion bitumen, and rock powder were used. Specimens were prepared using the Marshall method at two curing ages of 7 and 21 days, and by two methods: accelerated curing (with initial induction heating for 240 seconds) and natural curing (without initial induction heating). Subsequently, the specimens were subjected to Indirect Tensile Strength (ITS) tests at temperatures of 0, 15, and 40 degrees Celsius. After failure, both sets of specimens were subjected to restorative induction heating to evaluate their self-healing capacity. The specimens were then retested using the ITS test at the same temperatures to calculate the self-healing index by comparing the strength of the specimens before and after failure and induction heating. Results showed that with increasing age, the self-healing index rate of cold asphalt samples decreases with induction heating during curing. This becomes more pronounced with increasing test temperature. This trend indicates a significant effect of heating during curing and a rapid increase in the tensile strength of the samples at early pavement ages.

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References

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History

  • Receive Date: 13 September 2024
  • Revise Date: 06 February 2025
  • Accept Date: 08 February 2025

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