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Öğe Corrosion of reinforcing steel in concrete immersed in chloride solution and the effects of detergent additions on diffusion and concrete porosity(SCIENTIFIC TECHNICAL RESEARCH COUNCIL TURKEY, 2002) Kahyaoglu, H; Erbil, M; Yazici, B; Yilmaz, ABIn order to investigate the corrosion of reinforcing steel in concrete and the effects of chloride ions, oxygen diffusion and detergent additives of linear alkylbenzene (LAB) and linear alkylbenzene sulfonate (LAS), potentiokinetic experiments were carried out. Thus, by embedding steel electrodes into concrete specimens with a water/cement (W/C) ratio of 0.45, current-potential curves were obtained and the compressive strength of the specimens was measured. The electrochemical approach can be used to identify the effect of chloride on steel corrosion in concrete. It was found that the diffusion of chloride and oxygen through concrete and the reduction of oxygen on the metal surface are important parameters controlling reinforcing steel corrosion.Öğe Electrophilic substitution in indoles, part 20' Hammett correlations of the coupling of aryldiazonium tetrafluoroborates with indole and its 1-, 2-and 3-methyl derivatives(Pergamon-Elsevier Science Ltd, 2003) Aldemir, S; Kahyaoglu, H; Abdullah, MIHammett plots for the coupling of a range of substituted aryldiazonium tetrafluoroborate salts in dry acetonitrile with indole and its 1-, 2- and 3-methyl derivatives gave linear relationships, with rho values ca. of +2.60, +2.54, +2.40 and +3.60 respectively.