Influence of Ethanolamine and Nano-TiO_2 on the Fresh, Hardened, Microstructural and Corrosion Resistance Properties of Cementitious Composites

摘要

The influence of 1%, 3% and 5% content of ethanolamine (EA) and nano-TiO_2 (NT) on the fresh, hardened, microstructuraland corrosion resistance properties of cementitious composites under different exposure environments (tap water, saline waterand acidic solution) had been investigated. The setting time test confirmed that the EA acts as a retarder while NT acts as anaccelerator. The SEM and XRD results indicated that EA had an adverse effect on the microstructure, while NT improved themicrostructure and increased the amounts of desirable hydration products. The compressive strengths of EA-admixed mortarunder all the exposure mediums were found to be lower than control mortar, while NT had the opposite effects. The corrosioninhibition efficiency of 3% EA was found to be higher than the 5% content in all the three exposure environments, while thecorrosion inhibition efficiency of NT was increasing with the increase in the dosage.