Autogenous healing of hollow natural fiber (HNF)-reinforced reactive magnesium cement (RMC)

This work investigated the autogenous healing of interface bond between hollow natural fiber (HNF) (e.g., sisal fiber) and reactive magnesium cement (RMC). Preloading -reloading test was conducted to single embedded specimens, results suggested that can be improved by over 300% after wetting-air cycles conditioning, hot water conditioning demonstrated greater efficiency compared room temperature conditioning. Based on SEM-EDS characterization, this prominent restoration is due to: 1) further hydration carbonation RMC, which partially fills microcracks matrix; 2) migration precipitation expansive agents in lumens, improves contact matrix. Furthermore, resulted a significant recovery fiber-bridging strength fiber-reinforced doubled with preloading.