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An innovative approach to nano-MgO-modified cement-based mortar with AC electrically cured treatment and fire and seismic resistance
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DOI：10.1007/s10973-026-16040-y.png)
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Abstract
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This study investigates the synergistic effects of nano-magnesium oxide (NMgO) incorporation and alternating current (AC) electrical curing on the early hydration behavior, mechanical performance, crack evolution, and fire resistance of cement mortars. Mortars containing 0–1% NMgO were prepared, and setting time, hydration response, flexural and compressive strengths, and first-crack formation behavior were systematically evaluated. The results indicate that NMgO significantly modifies hydration kinetics, with final setting times ranging from 291 to 345 min depending on dosage. The optimum NMgO content of 0.50% enhanced 7-day flexural and compressive strengths by 115.53% and 42.18%, respectively, compared with the control mixture. Application of 60 V AC electrical curing further improved mechanical performance under all conditions tested. Vibration-based monitoring revealed a delay of approximately 4 s in first-crack initiation for the 0.50% NMgO mixture. Fire resistance tests at 500 °C and 800 °C confirmed substantial thermal stability enhancement due to NMgO modification.
Keywords:
AC curing
Fire resistance
Mortar
Nano-MgO
Self-crack retarding
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