Durability of blended ash geopolymer concrete in sulfuric acid solutions

Concrete technology for precast pipe manufacture

This paper presents an investigation into the durability of geopolymer concrete prepared using blended ash of pulverized fuel ash (PFA) and palm oil fuel ash (POFA) along with alkaline activators when exposed to a 2% solution of sulphuric acid for up to 18 months. Ordinary Portland cement (OPC) concrete was also prepared as control concrete. The main parameters studied were the evaluation of mass, compressive strength, products of degradation and microstructural changes. The deterioration was examined using X-ray diffraction (XRD), thermo- gravimetry (TGA/DTG), and scanning electron microscopy (SEM). The results of geopolymer and OPC concretes were compared and dis- cussed. The performance of geopolymer concrete when exposed to a 2% sulfuric acid solution for more than a year was superior to OPC concrete, which is attributed to a more stable cross-linked aluminosilcate polymer structure formed in the geopolymer concrete.

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