Capsule-based self-healing of cementitious materials is a promising solution to improve the serviceability and to prolong the longevity of concrete structures. The successful use of mechanical triggering microcapsules to achieve cracks healing is still challenging and is closely dependent on the breakage of capsules upon crack formation.

In this study, self-healing microcapsules were synthesized via complex coacervation using a styrene maleic anhydride (SMA) shell and an epoxy resin adhesive. The SMA/gelatin bi-layer wall formed with gelatin as the out layer for better trigger sensitivity under crack formation. The effects of various preparation parameters, referring to stirring rate, temperature, core-shell ratio and pH, have been investigated by characterizing the microcapsule morphology, shell thickness, size distribution, and chemical nature. The morphology demonstrates the encapsulation ability of SMA/gelatin and the spherical shape facilitates the rupture under crack formation. The elastic modulus and hardness of the microcapsules were determined using nano-indentation to assess the interfacial bonding and likelihood of mechanical triggering. Self-healing functionality of the developed microcapsules were validated in paste according to the in situ Acoustic Emission measurement.

基于胶囊的胶结材料自愈是提高混凝土结构的适用性和延长使用寿命的有前途的解决方案。成功使用机械触发微胶囊来实现裂缝愈合仍然具有挑战性，并且与裂缝形成时胶囊的破裂密切相关。

在这项研究中，使用苯乙烯马来酸酐 (SMA) 壳和环氧树脂粘合剂通过复合凝聚合成自修复微胶囊。SMA/明胶双层壁以明胶为外层形成，在裂纹形成时具有更好的触发灵敏度。通过表征微胶囊形态、壳厚度、尺寸分布和化学性质，研究了各种制备参数的影响，包括搅拌速率、温度、核壳比和 pH 值。形态证明了 SMA/明胶的封装能力，球形有利于裂纹形成下的破裂。微胶囊的弹性模量和硬度使用纳米压痕来确定，以评估界面结合和机械触发的可能性。原位声发射测量。