Author(s): HHM Darweesh

Abstract: Physical and mechanical properties of ordinary Portland cement (OPC) blended with magnesium oxide (MgO) cement pastes (OPC/MgO) have been studied. Results showed that all physical and mechanical properties of OPC cement are improved and enhanced by the incorporation of the reactive MgO up to 2.5 wt. % and tended to be stable at 3.0 wt. % because the water curing process significantly increased the reaction degree of the used MgO, but with any further increase of MgO content › 3.0 wt. %, negative results are obtained. It is good mention that though OPC/MgO cement needed high water requirements to achieve the best results, both total porosity and water absorption decreased at all curing conditions. This reflected positively on bulk density and mechanical strengths. MgO could be used as a useful and simple binder at normal conditions. The optimum amount of the added MgO is between 2.5-3.0 wt. % at which acceptable porosity, bulk density, water absorption, and mechanical properties were achieved, but more than this ratio must be avoided due to its adverse effects.

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