Algerian Journal of Engineering and Technology 2021-06-09T00:08:14+01:00 Abdelkrim REBIAI Open Journal Systems <p>Algerian Journal of Engineering and Technology (AJET) is an international scholarly refereed research journal which aims to promote the theory and practice of technology, innovation, and engineering.</p> Statistical analysis and Response Surface Modelling of the compressive strength inhibition of crude oil in concrete test cubes 2021-04-17T11:04:38+01:00 Sebastian Azowenu Nwose Francis Edoziuno Sylvester Osuji <p>The use of crude oil contaminated fine aggregates in the production of concrete significantly affect the properties of such concrete, especially the compressive strength. In the present investigation, response surface methodology (RSM) of the Design-Expert software version was used for the statistical analysis and predictive modelling of the compressive strength of concrete cubes made from crude oil contaminated fine aggregates at 7, 14, 28, and 56 days curing periods. The fine aggregates were mixed with varying concentrations of crude oil contamination (ranging from 0% to 5% by weight of the fine aggregates, at 1% interval). Concrete test cubes were produced for compressive strength determination and prediction phase of the modelling. A steady reduction in the compressive strength of the concrete cubes was recorded as the crude oil content increases, due to the inhibitive and surface shielding influence of crude oil molecules on the fine aggregates, thereby hindering physical bond formation between the cement paste and the aggregates. Statistical analysis of the output/response was carried out; a correlation coefficient of 0.9923 was obtained. The result of the modelling has shown that the use of RSM is adequate in the prediction of the compressive strength inhibition of crude oil in concrete made from crude oil-contaminated sand.</p> <p><a href=""><img src="" alt="DOI"></a></p> <p><strong>Cite as:</strong></p> <p>Nwose SA, Edoziuno FO, Osuji SO. Statistical analysis and Response Surface Modelling of the compressive strength inhibition of crude oil in concrete test cubes. <em>Alger. J. Eng. Technol. 2021</em>, 4:99-107.&nbsp; <a href=""></a></p> <p><strong>References</strong></p> <ol> <li>Osuji S, Nwankwo E. Effect of Crude Oil Contamination on the Compressive Strength of Concrete. <em>Niger J Technol.</em> 2015;34(2):259–65.</li> <li>Alsadey S. Effects of Used Engine Oil as Chemical Admixture in Concrete. Int J Energy Sustain Dev. 2018;3(2):38–43.</li> <li>Ejeh SP, Uche OAU. 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Available from:</li> </ol> <p>&nbsp;</p> <p>&nbsp;</p> 2021-04-16T10:30:27+01:00 Copyright (c) 2021 Electrodeposition of CaCO3 on stainless steel 316 L substrate: influence of thermalhydraulics and electrochemical parameters 2021-06-09T00:08:14+01:00 Sid Ahmed AMZERT Fahd ARBAOUI Mohamed Nadir BOUCHERIT Noureddine SELMI Salah HANINI <p>In this paper we study the effect of the hardness, the rotation speed, the temperature and the cathodic polarization on calcium carbonate scale deposit on rotating stainless steel electrode using electrochemical techniques. The scale deposit was investigated by X-Ray diffraction, scanning electron microscope, Infra-red spectroscopy and electrochemical impedance spectroscopy (EIS). The electrochemical results show that the Oxygen Reduction Reaction (ORR), which is responsible of CaCO<sub>3</sub> electrodeposition, takes place with 4 electrons at low rotation speed and 2 electrons at high rotation speed. The morphology of the CaCO<sub>3</sub> deposit shows that the crystals formed in the center of the electrode have small sizes compared to those of the periphery. Whatever the hydrodynamic or thermodynamic conditions, the Calcite form remains predominant. Other forms appear in particular conditions: at high temperature the aragonite form and at high cathodic polarization the vaterite form.</p> <p><a href=""><img src="" alt="DOI"></a></p> <p><strong>Cite as:</strong></p> <p>Amzert SA, Arbaoui F, Boucherit MN, Selmi N, Hanini S. Electrodeposition of CaCO<sub>3</sub> on stainless steel 316 L substrate: influence of thermal-hydraulics and electrochemical parameters. <em>Alger. J. Eng. Technol. 2021</em>, 4:90-98.&nbsp; <a href=""></a></p> <p><strong>References</strong></p> <ol> <li>Pečnik B, Hočevar M, Širok B, Bizjan B. Scale deposit removal by means of ultrasonic cavitation. Wear. 2016 Jun 15;356:45-52.</li> <li>Zuo Z, Yang W, Zhang K, Chen Y, Li M, Zuo Y, Yin X, Liu Y. 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Investigation of the hydrogen evolution phenomenon on CaCO3 precipitation in artificial seawater. Desalination. 2018 Oct 15;444:142-50.</li> <li>Huang JH, Mao ZF, Luo MF. Effect of anionic surfactant on vaterite CaCO3. Materials Research Bulletin. 2007 Dec 4;42(12):2184-91.</li> </ol> 2021-04-16T09:03:47+01:00 Copyright (c) 2021 Synthesis, characterization and antimicrobial studies on Mn(II), Fe(II), Co(II) complexes of schiff base derived from 3-Formylchromone and Benzohydrazide 2021-04-03T00:20:45+01:00 Hussaina Aminu Ibrahim Habu Nuhu Aliyu Musa Husaini Aysha Salees Dayyib <p>Schiff base formed by condensation of 3-formylchromone and benzohyrazide and its metal(II) complexes of Mn(II), Fe(II), and Co(II), have been prepared and characterized by conductivity measurement, magnetic susceptibility, IR Spectra, atomic absorption spectroscopy, elemental analysis, as well as melting point/decomposition temperature and solubility test. The melting point of the Schiff base (165 <sup>0</sup>C) and decomposition temperatures of the complexes (185-198)<sup>0</sup>C indicating their thermal stability. The molar conductivity measurement determined are in the range (10.54-23.10) Ω<sup>-1</sup>cm<sup>2</sup>mol<sup>-1</sup> revealing that all the complexes are non-electrolytic in nature. IR spectra of the Schiff base showed a band at 1633cm<sup>-1</sup> which assigned to ʋ(-C=N-) stretching vibration. This band was observed downfield in the range (1603 -1655) cm<sup>-1</sup> in the spectra of the metal(II) complexes revealing that the Schiff base formed metal complexes with the metal ions. The gram magnetic susceptibility measurements of the complexes showed that all the complexes except that of Zinc are paramagnetic and have tetrahedral geometry. The elemental analysis suggested a metal to ligand ratio of 1:1. The Schiff base and its metal complexes have been screened for their antimicrobial activity against four pathogens. Some compounds were active, while others are not active against the isolates.</p> <p><a href=""><img src="" alt="DOI"></a></p> <p><strong>Cite as:</strong></p> <p>Aminu Ibrahim H , Nuhu Aliyu H, Husaini M and Salees Dayyib A. Synthesis, characterization and antimicrobial studies on Mn(II), Fe(II), Co(II) complexes of schiff base derived from 3-Formylchromone and Benzohydrazide. <em>Alg. J. Eng. Tech. 2021</em>;4:81-89. &nbsp;<a href=""></a></p> <p><strong>References</strong></p> <ol> <li>Ashraf MA, Mahmood K, Wajid A, Maah MJ, Yusoff I. Synthesis, characterization and biological activity of Schiff bases. IPCBEE. 2011;10(1):185.</li> <li>Prakash A, Adhikari D. Application of Schiff bases and their metal complexes-A Review. <em> J. ChemTech Res.</em> 2011;3(4):1891-6.</li> <li>Vivek G, Pandurangan A. 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Tech. </em>2020;2:29-36.</li> </ol> 2021-04-03T00:18:16+01:00 Copyright (c) 2021 DFT and molecular dynamic simulation study on the corrosion inhibition of Aluminum by some flavonoids of Guiera Senegalensis leaves 2021-03-25T12:30:05+01:00 Ayuba Abdullahi Abubakar Muhammad <p>Quantum chemical calculations and molecular dynamics simulations were performed to investigate the effect of four flavonoids compounds (Kaempferol, Quercetin, Myricetin and Rhamnetin) from <em>Guiera Senegalensis </em>leaves on corrosion inhibition of aluminium metal in vapour phase. Quantum chemical parameters including E<sub>HOMO</sub>, E<sub>LUMO</sub>, energy gap (ΔE), electronegativity (χ), global hardness (η), global softness (σ) and fraction of electrons transferred (ΔN) from the flavonoid molecule to the aluminium surface were calculated and the results indicate that the larger the molecular size the better the inhibition efficiency. Local reactive sites through Fukui indices were also calculated to explain the effect of electronic and structural features of the flavonoid compounds present in the leaves extract of <em>Guiera senegalensis</em> (GS). The results showed that the point of interaction of inhibitor molecule with the Al(1 1 0) surface were through hydroxyl and carbonyl functional groups of the studied compounds. Molecular dynamic simulations revealed that the adsorption behaviour of each flavonoid molecule on Al(1 1 0) surface through quench dynamics were found to obey the mechanism of physical adsorption and the more negative is the adsorption energy between the inhibitor-metal surface the better inhibition performance of the molecule on Al(1 1 0) surface.</p> <p><a href=""><img src="" alt="DOI"></a></p> <p><strong>Cite as:</strong></p> <p>Ayuba A M,&nbsp; Abubakar M. DFT and molecular dynamic simulation study on the corrosion inhibition of Aluminum by some flavonoids of <em>Guiera Senegalensis</em> leaves. <em>Alg. J. Eng. Tech. 2021</em>, 4:66-73.&nbsp; <a href=""></a></p> <p><strong>References</strong></p> <ol> <li>Sethi T, Chaturvedi A, Upadhyaya RK, Mathur SP. Synergistic inhibition between Schiff’s bases and sulfate ion on corrosion of aluminium in sulfuric acid. <em>Protection of Metals and Physical Chemistry of Surfaces</em>. 2009;45(4):466-71.</li> <li>Rani BE, Basu BB. Green inhibitors for corrosion protection of metals and alloys: an overview. International Journal of corrosion. 2012. <a href=""></a></li> <li>El-Haddad MN. Chitosan as a green inhibitor for copper corrosion in acidic medium. <em>International Journal of Biological Macromolecules, </em>2013,55: 142-149.</li> <li>Ladha DG, Wadhwani PM, Lone MY, Jha PC, Shah NK. 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Plots of ln (wi - Δw) against time gave a linear graphs which confirmed a first order reaction mechanism for aluminium in inhibited and uninhibited acid solution. The activation energy value of uninhibited acid solution was found to be 36.39 kJ/mol which increased to 62.32 kJ/mol when 0.1 M concentration of the inhibitor was added. There was a decreased in the values of the rate constant from uninhibited to inhibited acid solution while those of half-life increased from uninhibited to inhibited acid. The obtained values of entropy change (ΔS), enthalpy change (ΔH) and Gibbs free energy of adsorption (ΔG<sub>ads</sub>) were also evaluated and discussed. The activation energy values and that of Gibbs free energy of adsorption support the physisorption mechanism between the molecules of the inhibitor and Aluminium surface.</p> <p><a href=""><img src="" alt="DOI"></a></p> <p><strong>Cite as:</strong></p> <p>Husaini M. 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