High performance concrete composites with robust self-healing capability

摘要

MEA was found to be effective in producing ECC-MgO system with self-healing capability as confirmed from the strength recovery, better transport property and superior crack healing characteristics. This was attributed to the MEA's ability to densification of microstructure through producing magnesium silicate hydrates (M-S-H) at later ages (characterized by cohesive cementitious properties) supplementing the formation of C-S-H products at early ages as confirmed from the SEM analysis. In addition, magnesium products also supplement the formation of CaCO_3 and C-S-H products formed within the crack openings enhancing the strength of already healed cracks especially when loadings are reapplied. All these findings should provide inspiration/justification to employ MEA as a self-healing agent in the production of an ECC-MgO self-healing system for sustainable crack-free construction.