Passive Smart Cementitious Composites for Dynamic Control Structures: Internal Timed Release of Chemicals for Self-Repair of Crack Damage

该提案代表了对开发一种智能结构复合材料的可行性的调查，这种复合材料无论何时何地由于地震超载而产生裂缝，都具有自愈能力。循环载荷或其他机械或环境载荷。本研究的一个主要重点将是空心纤维中化学物质的定时释放，这将导致(1)裂缝密封，(2)脱粘/破裂纤维与基体的重新结合。候选化学品包括粘合剂，结晶再水剂Xypex，交联或空气固化聚合物化学品。特定纤维类型作为被动传感器和致动器的问题，在涉及纤维/基体界面结合的控制系统中，伪应变硬化和裂缝宽度控制，在修复机制中，实时过程可视化、事件后属性和结构控制是本研究的重点。

This proposal represents an investigation into the feasibility of developing a smart structural composite which has a self-healing capability whenever and wherever cracks are generated as a result of seismic overloads, cyclic loading or other mechanical or environmental loads. A major focus of this research will be on the timed release of chemicals from hollow fibers which results in (1) crack sealing, and (2) rebonding of debonded/ruptured fibers from the matrix. Candidate chemicals include adhesive, crystallizing rehydrater Xypex, and crosslinking or air curing polymer chemicals. Issues in specific fiber types acting as passive sensors and actuators, in a control system involving fiber/matrix interfacial bond, pseudo strain-hardening and crack width control, in repair mechanisms, real time process visualization, post-event properties, and structural control are addressed in this research.