Abstract
The ability to control self-healing of cement by using nanoparticles was investigated in the present work. The physico-mechanical properties, the mineralogical composition and the microstructure observation were tested before cracking at 28 days. After the formation of cracks the healing capability under water immersion was detected by optical observation. The self-healing was supported by porosity reduction, new formed materials’ formation in micropores and cracks’ width elimination in the pastes. The addition of 1.5%wt nano-calcium oxide (NC) healed the cracks by 100% on some areas and by 61% in other areas, based to the crack width measurement. The combination of NC and nanosilica (NS) by 1.5%wt respectively, led to crack width decrease, through the formation of efflorescence-like crystals. Overall, the use of nanoparticles in low proportions is proposed for self-healing properties promotion in cement pastes.
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