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