Journal of Materials in Civil Engineering· 2026Q1
Durability Index and Microstructure Evolution of Magnesium Sulfate-Exposed One-Part and Two-Part Alkali-Activated Slag Concretes
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- Q1SCImago
- 2026year
Short summary
Alkali-activated slag concrete using anhydrous sodium silicate (Na2SiO3-anhydrous) showed 17% higher compressive strength and 32.7% lower electrical resistivity decrease than other activators after 450 days of magnesium sulfate exposure.
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Key points
- Anhydrous sodium silicate (Na2SiO3-anhydrous) activated slag concrete showed 17% higher compressive strength than NaOH + Na2SiO3 activated concrete after 450 days of sulfate exposure.
- The Na2SiO3-anhydrous mixture experienced a 32.7% decrease in electrical resistivity, compared to 46.8% and 44.6% for other activators, indicating better resistance to sulfate attack.
- Mass loss after 450 days was 3.5% for the Na2SiO3-anhydrous mixture, suggesting superior durability in magnesium sulfate environments.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Durability enhancement of low-carbon alkali-activated cements, as an emerging alternative to portland cement, is imperative for optimal performance in various conditions. This study examines the influence of one-part and two-part activators ( Na 2 SiO 3 · 5 H 2 O , Na 2 SiO 3 -anhydrous, and NaOH + Na 2 SiO 3 ) on the long-term performance of alkali-activated slag concretes exposed to a 5% magnesium sulfate ( MgSO 4 ) solution for 450 days at 23 ° C ± 2 ° C . Experimental results show that the mixture activated with Na 2 SiO 3 -anhydrous exhibits compressive strength 17% and 7% higher than the NaOH + Na 2 SiO 3 and Na 2 SiO 3 · 5 H 2 O mixtures, respectively, after prolonged sulfate exposure. Its electrical resistivity decreases by 32.7%, compared to reductions of 46.8% and 44.6% for the two-part and pentahydrate mixtures. Mass loss after 450 days was 3.5% for Na 2 SiO 3 -anhydrous, 4.8% for Na 2
The authors' abstract, as published at the source. Journal of Materials in Civil Engineering, 2026 · DOI ↗
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Field: Civil and Structural Engineering
Civil and Structural EngineeringEngineering