Determination of the origin of the strength regain after self-healing of binary and ternary cementitious materials including slag and metakaolin
Résumé
A mechanical assessment of the self-healing process of complex cementitious materials with mineral additions is presented. Mortars made with binary and ternary binders (blast furnace slag, fly ash, metakaolin and silica fume) to reach 30 vol% substitution ratios were prepared, and then small cracks with a width of 10 µm were created at the age of 2 days. After a 26-day healing period, mechanical properties obtained from three point bending tests were analyzed to identify the recovery due to healing. In addition, the microstructure of self-healing products was studied using various techniques (TGA, SEM/EDS, and XRD). It was found that ternary compositions might exhibit a better self-healing performance compared to single or binary compositions. The mechanical tests indicate a better stiffness recovery for specimens prepared from the ternary mixture. This improvement of mechanical response is presumably due to the newly formed products precipitated in the cracks.
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