[Shumakov et. al., Vol.6 (Iss.1): January 2019] ISSN: 2454-1907 DOI: https://doi.org/10.29121/ijetmr.v6.i1.2019.349 Http://www.ijetmr.com©International Journal of Engineering Technologies and Management Research [94] INFLUENCE OF MOLDING METHOD ON PRODUCTS MADE OF MAGNESIA BINDER Igor Shumakov *1 , Аssaad Мoustapha *2 , Basheer N. Younis *3 *1, *2, *3 Civil engineering, Kharkiv National University of Civil engineering and Architecture, Ukraine Abstract: This paper presents effect vibrovacuumizing (vibration+vacuum) on the strength of magnesia binder. The specimens were prepared at the water-cement ratio of 0.8 and they were tested at 1, 3, 7 days of curing. Some interesting results were obtained from the test of different method forming. Keywords: Caustic Magnesite; Vibrovacuumizing; Vibration; Compression; Molding. Cite This Article: Igor Shumakov, Аssaad Мoustapha, and Basheer N. Younis. (2019). “INFLUENCE OF MOLDING METHOD ON PRODUCTS MADE OF MAGNESIA BINDER.” International Journal of Engineering Technologies and Management Research, 6(1), 94-97. DOI: https://doi.org/10.29121/ijetmr.v6.i1.2019.349. 1. Introduction Magnesia or magnesium oxide is an alkaline earth metal oxide. The majority of magnesium oxide produced today is obtained from the calcination of naturally occurring minerals, magnesite, MgCO3, being the most common. Other important sources of magnesium oxide are seawater, underground deposits of brine and deep salt beds from which magnesium hydroxide [Mg (OH)2] is processed. Magnesium is the eighth most abundant element constituting about two per cent of the earth's crust and typically 0.12% of seawater. Both MgCO3 and Mg (OH)2 are converted to MgO by calcinations [1]. The thermal treatment of the calcination process affects the surface area and pore size and hence the reactivity of magnesium oxide formed. The source largely determines the level and nature of impurities present in the calcined material. Caustic calcined magnesia which is used in a wide range of industrial applications e.g. plastics, rubber, adhesives and acid neutralisation is formed by calcining in the range 700–1000 o C. By calcining in the range 1000– 1500 o C the magnesium oxide is used where its lower chemical activity is required e.g. fertilizer and animal feed. Dead-burned magnesia, which is produced in shaft and rotary kilns at temperatures over 1500 o C, has reduced chemical reactivity therefore is more suited to refractory applications. Finally, fused magnesia which is produced in an electric arc furnace from caustic calcined magnesia at temperatures in excess of 2650 o C is used for a variety of refractory and electrical applications [2]. The aim of the present work is to characterize the effect vibrovacuumizing on strength of magnesia binder.