Effect of binary cement replacement materials on sulfuric acid resistance of dense concretes

Biogenic sulfuric acid corrosion is often a problem in sewer environments. Also in certain industrial activities sulfuric acid is used during the production process. It can lead to a fast degradation of the concrete structures. There is therefore a substantial need for construction of durable concrete structures in such environments. The porosity of concretes plays an important role in harsh environments. For production of low-porosity concretes, optimisation of aggregate and cement grading and their proportions is necessary. A research programme was conducted to investigate concrete resistance in a sulfuric acid environment. Four concrete groups were investigated. The first group contains type II Portland cement as a control mix and the second group contains cement and super-fine quartz powder as a filler with particle size less than 16 μm. The third group includes three different mixtures containing cement and cement material replacements including 8% silica fume, 20% trass and pumice as natural pozzola...

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