Concrete structures undergo internal damage; this usually starts at the atomic level with defects that then grow and form cracks, which can propagate through the material. Here, a method of preparation of poly(methyl methacrylate) (PMMA) nanocapsules adhesive system via miniemulsion polymerization technique is reported, where MMA + DMA (resin + accelerator) and BPO (hardener) components are separately encapsulated by PMMA shells. The crack-healing potential of these nanocapsules was then investigated by embedding them into the mortar matrix. The prepared PMMA core–shell self-healing nanostructures survived the mixing and hardening processes, and the hardened mortar alkaline environment. The stress fields associated with propagating cracks (load‐induced cracking) broke the brittle/weak inert shell of these core–shell structures, resulted in releasing the healing agents to bridge the nascent and early-stage fractures (< 10 µm) in a short time. Long-term healing was achieved through the formation of polymorph calcite crystals in the presence of moisture and CO₂, which improved the durability of mortar by filling the gaps. Formulation design (addition of chemical admixtures) and process parameters (blade design and mixing speed) were found to directly impact the uniform distribution of nanocapsules, the survival rate of nanocapsules, and the overall strength of the hardened concrete. The stepwise approach to formulate and fabricate a novel high-strength self-healing concrete system unlocks unique opportunities to design nanomaterials that safeguard the integrity of concrete structures.

混凝土结构受到内部破坏；这通常从原子级开始，然后出现缺陷，然后生长并形成裂纹，这些裂纹可以传播通过材料。在这里，报道了一种通过细乳液聚合技术制备聚（甲基丙烯酸甲酯）（PMMA）纳米胶囊粘合剂体系的方法，其中MMA + DMA（树脂+促进剂）和BPO（硬化剂）组分分别由PMMA壳包裹。然后，将这些纳米胶囊嵌入砂浆基质中，研究其裂纹愈合潜力。制备的PMMA核-壳自修复纳米结构在混合和硬化过程以及硬化的砂浆碱性环境中均能幸存。与扩展裂纹（载荷引起的裂纹）相关的应力场破坏了这些核-壳结构的脆性/弱惰性壳，导致在短时间内释放出愈合剂以桥接新生和早期骨折（<10 µm）。在有水分和一氧化碳存在的情况下，通过形成多晶形方解石晶体可以实现长期愈合_{如图2所示}，其通过填充间隙提高了砂浆的耐久性。研究发现配方设计（添加化学外加剂）和工艺参数（叶片设计和混合速度）直接影响纳米胶囊的均匀分布，纳米胶囊的存活率以及硬化混凝土的整体强度。逐步配制和制造新型高强度自愈混凝土体系的方法为设计纳米材料提供了独特的机会，从而可以保护混凝土结构的完整性。