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Concrete technology for precast pipe manufacture

Durability of blended ash geopolymer concrete in sulfuric acid solutions


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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Universiti Teknologi Malaysia
Johor Bahru, Malaysia
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CPi worldwide journals are trade journals for the concrete and precast concrete industry that are published in 12 different language editions in more than 170 countries. These trade journals, with their practical editorial reporting on research, production and applications, are specifically addressing the decision makers of the concrete and precast concrete industry.

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