Calcium alginate capsules can gradually release the healing agent inside without rupture under cyclic traffic loading and are a promising self-healing technology for asphalt pavement. However, they have a low strength and tend to release the healing agent too fast. To enhance the strength of calcium alginate capsules and prevent them from releasing healing agent prematurely, calcium alginate-attapulgite composite capsules were synthesized with different synthesis parameters and their physical properties, morphological characteristics, release and healing behaviors were studied respectively. It was found that the incorporation of attapulgite improved the strength of calcium alginate capsules and could prevent the capsules from leaking healing agent during the drying process. The incorporation of attapulgite also slowed down the healing agent (sunflower oil) release speed of the calcium alginate capsules. Calcium alginate-attapulgite composite capsules can release 55.2% of the oil inside after 4 years of service within a medium traffic grade pavement, providing asphalt mixture with the ability to release the oil gradually to suit the cracking process of asphalt pavement. The released oil from the calcium alginate-attapulgite composite capsules improved the self-healing property of asphalt mixture and the capsules maintained their original spherical shape after releasing most of the oil inside.

海藻酸钙胶囊可以在周期性交通负荷下逐渐释放出内部的愈合剂而不会破裂，是一种很有前景的沥青路面自修复技术。但是，它们的强度低，并且往往会过快地释放愈合剂。为了提高海藻酸钙胶囊的强度并防止其过早地释放治疗剂，合成了具有不同合成参数的海藻酸钙-凹凸棒石复合胶囊，并对其物理性质，形态特征，释放和愈合行为进行了研究。已经发现，凹凸棒土的掺入提高了藻酸钙胶囊的强度，并且可以防止胶囊在干燥过程中泄漏愈合剂。凹凸棒土的掺入也减慢了藻酸钙胶囊的愈合剂（葵花油）的释放速度。海藻酸钙-凹凸棒石复合胶囊在中等交通等级的路面中使用4年后可在内部释放55.2％的油，使沥青混合料具有逐渐释放油的能力，以适应沥青路面的裂化过程。海藻酸钙-凹凸棒石复合胶囊释放的油改善了沥青混合物的自愈性能，并且在释放了大部分油后，胶囊保持了其原始球形。为沥青混合料提供逐渐释放油的能力，以适应沥青路面的裂化过程。海藻酸钙-凹凸棒石复合胶囊释放的油改善了沥青混合物的自愈性能，并且在释放了大部分油后，胶囊保持了其原始球形。为沥青混合料提供逐渐释放油的能力，以适应沥青路面的裂化过程。海藻酸钙-凹凸棒石复合胶囊释放的油改善了沥青混合物的自愈性能，并且在释放了大部分油后，胶囊保持了其原始球形。