复合结构微胶囊的掺量与粒径对自修复性能的影响研究

Key Points

• This research aims to improve the self-healing capabilities of cement-based materials by developing microcapsules.
• Developed microcapsules using mineral powder, fast-setting cement, and polyvinyl alcohol.
• Analyzed the effects of microcapsule dosage and particle size on mechanical properties and self-healing.
• Utilized spray drying combined with disc granulation and coating techniques for microcapsule preparation.
• At a microcapsule dosage of 10% (particle size 2.36-3.2mm), the 28-day compressive strength was minimally affected, with optimal self-healing performance.
• After 28 days of repair maintenance, the crack repair rate exceeded 85% and compressive strength recovery rate was over 90%.
• The permeability coefficient significantly decreased to 0.15, and repair products were primarily calcium carbonate and C-S-H gel.