Preparation and studying some physical properties of copper oxide nanoparticles

Salem, Karrar Hazim; Hasan, Nuha Hadi Jasim Al; Alebadi, Shireen N.; Alkhafaji, Mohammed Ayad; Zabibah, Rahman S.; Judi, Hawraa Kareem; Abdul-Zahra, Dalael Saad; Mohammed, Kahtan A.; Kumar, Harish; Prakash, Chander; Saxena, Kuldeep K.

doi:10.1080/2374068x.2022.2161169

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…The MP0.5, MP1.0, MP1.5, MP2.0, and MP2.5 mixes displayed slump values 11, 24, 41, 47, and 61% lower than the MP0 mix, respectively. This finding aligns with prior studies [ 44 , 45 ]. This correlation arises from the fact that cellulose, the primary constituent of the wastepaper, is a hydrophilic material known for its exceptional water-absorbing properties [ 46 ].…”

Section: Resultssupporting

confidence: 93%

Mechanical, Durability, and Microstructure Assessment of Wastepaper Fiber-Reinforced Concrete Containing Metakaolin

Valizadeh Kiamahalleh,

Gholampour,

Rezaei Shahmirzadi

et al. 2024

Materials

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This study evaluates the potential use of discarded plasterboard paper as fibers from buildings to reinforce concrete. Various concentrations of wastepaper fibers (0.5%, 1%, 1.5%, 2%, and 2.5% by weight of the binder) were investigated in this research. To mitigate the water absorption effect of the paper fibers, metakaolin was employed as a partial cement replacement. The results demonstrate that the inclusion of the wastepaper fiber enhances the mechanical and durability performance of the concrete. The optimal fiber proportion was identified as 1%, leading to a 29% increase in the compressive strength, a 38% increase in the splitting tensile strength, a 12% decrease in the water absorption, and a 23% decrease in the drying shrinkage with respect to the concrete containing 20% metakaolin. However, exceeding this optimal fiber content results in decreased mechanical and durability properties due to the fiber agglomeration and non-uniform fiber distribution within the concrete matrix. Based on the microstructural analysis, the improved performance of the concrete is ascribed to decreased porosity, more refined pore structure, and reduced propagation of microcracks within the concrete matrix in the presence of wastepaper fiber. According to the results, concrete containing 20% metakaolin and 1% wastepaper fiber exhibits durability and mechanical properties comparable to those of the traditional concrete. This finding highlights the significant promise of reducing dependency on conventional cement and incorporating suitable recycled materials, such as discarded plasterboard, and secondary by-products like metakaolin. Such a strategy encourages the preservation of resources, reduction in carbon dioxide emissions, and a decrease in the ecological footprint resulting from concrete production.

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