Effect of Sulfate Attack on Fly Ash / Slag Geopolymer Mortar | ||||
| SVU-International Journal of Engineering Sciences and Applications | ||||
| Volume 6, Issue 1, June 2025, Page 142-151 PDF (833.94 K) | ||||
| Document Type: Original research articles | ||||
| DOI: 10.21608/svusrc.2025.331401.1245 | ||||
 View on SCiNiTO | ||||
| Author | ||||
hany ahmed 
| ||||
| Department of Civil Engineering, Faculty of Engineering, Beni-Suef University, Beni-Suef, 62511, Egypt | ||||
| Abstract | ||||
| This paper aims to investigate the behavior of fly ash/slag geopolymer mortar (FA/S-GM) exposed to sulfate attack. Four FA/S-GM mixtures with different slag replacement levels (0 - 20% by mass of FA) were prepared. Four more ordinary Portland cement/slag mortar (OPC/S-M) mixtures with the same slag replacement levels were prepared as control specimens. All mortar specimens were immersed in 5% sodium sulfate solution for 52 weeks. Compressive strength, Expansion, weight gain, x-ray diffraction (XRD), and scan electron microscopy (SEM) approaches were conducted throughout this research. The mechanical and physical properties of FA/S-GM were superior to those of OPC/S-M, revealing excellent sulfate resistance. After 52 weeks of sulfate exposure, the compressive strength of FA/S-GM increased while the compressive strength of OPC/S-M decreased when compared to their pre-sulfate strength. FA/S-GM and OPC/S-M had optimal slag contents of 20% and 10%, respectively. XRD and SEM analyses revealed no ettringite or gypsum in FA/S-GM. | ||||
| Keywords | ||||
| Geopolymer; Expansion; Compressive Strength; Slag; Flay Ash | ||||
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