Abstract
Magnesium oxychloride (MOC) cement has a series of advantages, such as high compressive resistance, low thermal conductivity, however, the poor toughness has limited the application. In this study, polyformaldehyde (POM) fiber was selected to enhance the toughness of MOC cement. The influence of HNO3, NaOH and plasma treatments on POM fibers were investigated and the morphology, chemical groups, tensile strength and pullout force of the treated POM fibers were characterized. It was found that the plasma-treated POM fibers exhibited an excellent bonding effect with the MOC cement matrix since the nanoscale cement crystal could grow in the micron-level pores of the fibers that were generated during the plasma treatment. This strong bonding effect induces a mechanically interlock structure between POM fibers and the MOC cement matrix, toughening and reinforcing the MOC cement significantly. Therefore, the buildings made by the developed POM/MOC composites would maintain a better structural integrity when encountering natural disasters (e.g., earthquakes, mudslides), providing a better chance for people to escape.
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