The effect of a sulfonated naphthalene-based polymer on redox reaction data, potassium ferrocyanide complexation, and the compressive strength of Portland cement paste

Abstract

In this work, the effect of sulfonated naphthalene-based polymer (Sikament) on redox reactions of potassium ferrocyanide and the compressive strength of Portland Cement paste was investigated. Cyclic voltammetry of sulfonated naphthalene-based polymers with different concentrations was measured experimentally using a DY2000 potentiostat. We used KCl (0.1 M) as a supporting electrolyte. A glassy carbon working electrode was used, purified, and polished before use. The other two electrodes are platinum wire and Ag/AgCl electrodes put in saturated KCl solution were used. The interaction of sulfonated naphthalene-based polymer and potassium ferrocyanide was studied with the use of different potassium ferrocyanide concentrations at 290.65 K. The oxidation, reduction mechanisms and the stability constants of the complexes formed are discussed. Scan rates and different kinetic parameters that resulted from this interaction were also evaluated and their values were discussed. The compressive strength for each paste at different time intervals (1, 3, 7 and 28 days) was determined. The results showed clearly that the polymer is combined with the iron and thus increases its compressive strength and decreases iron oxidation. Complexation was observed from the interaction thermodynamic data resulting from the interaction of the used polymer and ferrocyanide ion.