Abstract
This paper aims to study the effect of hydrogels on the self-healing processes in cementitious systems with a large dosage of supplementary cementitious materials including slag and fly ash. The material characterization was conducted using thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM/EDS). The healing products in the cement slag system consisted primarily of calcium carbonate and hydration products including calcium silicate hydrate (C-S-H) and ettringite. In the cement fly ash system, calcium carbonate and C-S-H/C-A-S-H comprise the main phases in the healing products. It was noticed that the ratio of calcium carbonate to the hydration products was larger in the cement fly ash systems compared to the cement slag systems. The addition of hydrogels resulted in a higher content of calcium carbonate in the healing products of both systems. Hydrogels enhanced the mechanical regain and crack filling in both cement slag and cement fly ash systems compared to the control system without hydrogels.
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