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Threshold effect of Na2O dosage on performance, microstructure and sustainability of alkali-activated slag based UHPC
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DOI：10.1016/j.cscm.2026.e06361.png)
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Abstract
En 中文
• Na2O dosage showed an apparent threshold-like effect on AAS-UHPC performance. • The mixture with 9% Na2O exhibited optimal mechanical performance and the most refined pore structure. • Excessive Na2O induced volume instability, cracking, and strength loss. • Drying shrinkage increased monotonically with increasing Na2O dosage. • 8% Na2O offered a sustainability-oriented option with lower alkali demand, carbon impact, and material cost.
Keywords:
Alkali-activated slag
Ultra-high performance concrete
Threshold effect
Microstructural evolution
Life-cycle assessment
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