Abstract
In the presented paper, magnetite nanoparticles synthesized with the high molecular weight poly-N-vinylpyrrolidone (PVPr) were used as dopants to enhance the physical and mechanical properties of concrete for the purpose of plug-back treatment. Specifically, magnetite nanoparticles were synthesized in PVPr medium in an amount of 1% by mass of the cement. The content of magnetite nanoparticles in the composition constituted 1.0 to 2.0% (w/w) of the dry mass of the cement. Concrete specimens were prepared at a water-to-cement ratio of 0.5 and the obtained concretes were analyzed by X-ray diffraction and FTIR spectroscopy after 28 days of curing. The nature of the chemical interaction between PVPr and magnetite nanoparticles with cement components were determined, affecting the crystal structure and hydration process of concrete. It was determined that the polymer macromolecule, as well as the coordination bond formation between PVPr/Fe3O4 nanoparticle fragments and calcium/aluminum silicates, contributes to the strengthening of certain mechanical properties of concrete. Keywords: poly-N-vinylpyrrolidone; magnetite nanoparticles; cement concrete; chemical bond; hydration
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