Abstract
The calcium alginate capsules can release the interior rejuvenator under the activation of microwave irradiation and compressive loading. However, the healing capacities of asphalt concrete with the capsules under actions of microwave and loading were yet not investigated. In view of this, the paper aimed at exploring the healing capacities of asphalt concrete with dual-responsive capsules via microwave irradiation and compressive loading. The capsules were synthesized using the orifice-coagulation bath method. Numerous tests were undertaken on the capsules for determining the interior structure, thermal property, mechanical characteristics, and relative rejuvenator content. Besides, the spatial location of capsules within asphalt concrete following mixing and compaction was explored. The surface temperature distribution of asphalt mixture beam after multiple microwave irradiation was characterized. Additionally, the rejuvenator release ratios of capsules and self-healing properties of asphalt mixture containing capsules were investigated following different cycles of compression loading and multiple cycles of microwave action. The results manifested that the muti-chamber capsules had the excellent thermal and mechanical resistance during the preparation of asphalt mixture and presented uniform spatial distribution in asphalt concrete. Besides, the asphalt mixture containing capsules owns dual responsive healing system and had high self-healing level under the stimulation of compressive loading and microwave irradiation.
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