Abstract
The difference of corrosion resistance mechanism between alkali-activated concrete (AAC) and ordinary Portland cement concrete (OPC) under biogenic sulfuric acid corrosion was compared. By measuring the local surface morphology, mass loss, compressive strength and Ca2+ dissolution of OPC and AAC specimens, the corrosion resistance of these two kinds of concrete to biogenic sulfuric acid (BSA) was studied. The hydration products and corrosion products of OPC and AAC were studied with X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and environmental scanning electron microscopy-energy dispersive spectroscopy (ESEM-EDS). The results show that under BSA corrosion, the thickness, roughness and porosity of the corrosion layer of OPC are obviously greater than those of AAC. The main corrosion products of OPC and AAC is gypsum. The amount of gypsum produced on the surface of OPC corrosion layer is larger than that of AAC. In addition, the bacterial effect on the surface of AAC corrosion layer is greater than that of OPC, which makes the corrosion path of BSA shorter than that of OPC. Therefore, the corrosion resistance of AAC to BSA is better than that of OPC.
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