Effect of nano-CuO on engineering and microstructure properties of fibre-reinforced mortars incorporating metakaolin: experimental and numerical studies

Article


Ghanei, Amir, Jafari, Faezeh, Mehrinejad Khotbehsara, Mojdeh, Mohseni, Ehsan, Tang, Waiching and Cui, Hongzhi. 2017. "Effect of nano-CuO on engineering and microstructure properties of fibre-reinforced mortars incorporating metakaolin: experimental and numerical studies." Materials. 10 (10). https://doi.org/10.3390/ma10101215
Article Title

Effect of nano-CuO on engineering and microstructure properties of fibre-reinforced mortars incorporating metakaolin: experimental and numerical studies

ERA Journal ID123663
Article CategoryArticle
AuthorsGhanei, Amir (Author), Jafari, Faezeh (Author), Mehrinejad Khotbehsara, Mojdeh (Author), Mohseni, Ehsan (Author), Tang, Waiching (Author) and Cui, Hongzhi (Author)
Journal TitleMaterials
Journal Citation10 (10)
Number of Pages22
Year2017
Place of PublicationSwitzerland
ISSN1996-1944
Digital Object Identifier (DOI)https://doi.org/10.3390/ma10101215
Abstract

In this study, the effects of nano-CuO (NC) on engineering properties of fibre-reinforced mortars incorporating metakaolin (MK) were investigated. The effects of polypropylene fibre (PP) were also examined. A total of twenty-six mixtures were prepared. The experimental results were compared with numerical results obtained by adaptive neuro-fuzzy inference system (ANFIS) and Primal Estimated sub-GrAdient Solver for SVM (Pegasos) algorithm. Scanning Electron Microscope (SEM) was also employed to investigate the microstructure of the cement matrix. The mechanical test results showed that both compressive and flexural strengths of cement mortars decreased with the increase of MK content, however the strength values increased significantly with increasing NC content in the mixture. The water absorption of samples decreased remarkably with increasing NC particles in the mixture. When PP fibres were added, the strengths of cement mortars were further enhanced accompanied with lower water absorption values. The addition of 2 wt % and 3 wt % nanoparticles in cement mortar led to a positive contribution to strength and resistance to water absorption. Mixture of PP-MK10NC3 indicated the best results for both compressive and flexural strengths at 28 and 90 days. SEM images illustrated that the morphology of cement matrix became more porous with increasing MK content, but the porosity reduced with the inclusion of NC. In addition, it is evident from the SEM images that more cement hydration products adhered onto the surface of fibres, which would improve the fibre–matrix interface. The numerical results obtained by ANFIS and Pegasos were close to the experimental results. The value of R2 obtained for each data set (validate, test and train) was higher than 0.90 and the values of mean absolute percentage error (MAPE) and the relative root mean squared error (PRMSE) were near zero. The ANFIS and Pegasos models can be used to predict the mechanical properties and water absorptions of fibre-reinforced mortars with MK and NC.

Keywordsnano-CuO; metakaolin; fibre-reinforced cement mortar; microstructure properties; interfacial transition zone (ITZ); ANFIS method
ANZSRC Field of Research 2020400505. Construction materials
400599. Civil engineering not elsewhere classified
Byline AffiliationsIslamic Azad University, Iran
University of Malayer, Iran
Centre for Future Materials
University of Newcastle
Shenzhen University, China
Institution of OriginUniversity of Southern Queensland
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