The mechanical properties and electrochemical behavior of cement paste containing nano-MgO at different curing temperature

The purpose of the research work is to investigate the mechanical properties and electrochemical behavior of cement paste containing nano-MgO (NM) which cured at different temperature. The measurements of flexural strength, compressive strength and electrochemical impedance spectroscopy were conducted. A suitable electrochemical equivalent mode was applied to fit the measured electrochemical impedance data (Nyquist curve), therefore the electrochemical property for cement paste containing NM can be quantitatively obtained. Results demonstrated that the flexural and compressive strength gradually increased with the increasing of NM contents ranged from 0 wt% to 9 wt% in cement paste. Moreover, the strength of the cement paste containing NM was increased gradually when the curing temperature rising from 20 degrees C to 60 degrees C. In addition, with the increasing of NM content and the rising of curing temperature, the electrolyte solution resistance R-s and the ion transport processes resistance R-ct1 showed increasing tendency. And XRD, TG-DSC and SEM were used to characterize the phases, mass/heat changes and microstructure of the hardened cement pastes, which provided some evidence on these research findings. (C) 2018 Published by Elsevier Ltd.