Assessment the Influence of Fe₂O₃ Micro and Nanoparticles on Properties of Concrete

Abstract:

This work focuses on investigating the behavior of micro and nanoFe₂O₃ in concrete through the study of microscopy, compressive strength and flexural strength. Seven mixes of concrete are prepared. Three of which include micro Fe₂O₃ comprising 1%, 3% and 5% as partial substitutions of cement weight and the other three mixes containing 1%, 3% and 5% nanoFe₂O₃ as a partial substitutions of cement weight, as well as the reference mix. SEM study exhibits that the microstructure of sample produced with micro Fe₂O₃ show more uniformity and dense compared with reference sample. However, existence of micro cracks in the microstructure in mixes with micro Fe₂O₃ is clear especially with increasing micro Fe₂O₃ content to 3% and 5%. In mixes with nanoFe₂O₃, the new shapes of needle like crystals and flower like crystals can be distinguished. The presence of these types of crystals in thrives amount approve that nanoFe₂O₃ producing new phases of gel. Hence, the microstructure of samples is condensed, and with the increasing of nanoFe₂O₃ content the microstructure is completely compacted. The results of compressive strength and flexural strength showed that the mechanical properties are related to microstructure properties. When micro Fe₂O₃ is used, the mechanical properties drop obviously. While, the mechanical properties are improved in mixes containing nanoparticles in comparison with the control mix.

• Periodical: Key Engineering Materials (Volume 870)
• Pages: 29-37
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.870.29
• Online since: October 2020
• Authors: Zainab Hasan Abdulabbas*, Ali Talib Jasim, Marwa Asad Salih
• Keywords: Compressive Strength, Flexural Strength, Micro Fe₂O₃, Microstructure, Nano-Fe₂O₃, SEM

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