POLİAKRİLAMİD-NANO MAQNETİT HİSSƏCİKLƏRİ İLƏ DOLDURULMUŞ BETON KOMPOZİTİN ELEKTROKİMYƏVİ İMPEDANS TƏDQİQİ

Abstract

In the presented article, concrete samples were prepared from a mixture of Portland cement with water at a water/cement factor of 0.5. Which concrete samples contain magnetite nanoparticles stabilized with polyacrylamide (PAA) as much as 1-2% of cement. The resistance of 28-day-hardened concrete was evaluated by the method of electrical impedance spectroscopy. It has been shown that PAA retains its physical structure by chemical electrostatic bonding with magnetite nanoparticles and interacts with calcium and aluminum silicates in cement. According to the results of electrochemical impedance spectroscopy, the resistance values of concrete samples with PAA/Fe3O4 are significantly different compared to control and PAA/concrete. The addition of PAA to concrete led to the approximation of the resistance indicators at different stress values and the increase of Z`` after the value of 2×106 Z`. Immobilization of PAA macromolecule, which is a polyelectrolyte, in the cement structure ensured long-distance connection of particles and permeability between them. Thus, the inclusion of PAA-containing magnetite nanoparticles in the concrete structure ensures timely hardening without affecting the hydration process. Also, the stable size of magnetite nanoparticles due to PAA in later periods leads to an increase in electrical resistance values.