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MAGNESIUM OXYCHLORIDE CEMENT COMPOSITES WITH INCREASED FILLER CONTENT
Abstract
The most widely used building materials in the world are those based on Portland cement. Unfortunately, their use is associated with a number of negative environmental impacts, from CO2 emissions to the depletion of natural aggregate resources. In order to contribute to greater environmental responsibility, this work investigated building materials containing both alternative binders and fillers. Magnesium oxychloride cement (MOC) is considered to be a more sustainable binder than Portland cement and is characterized by superior mechanical, physical and chemical parameters, including the ability to bind large quantities of different aggregates, even selected wastes. Presently, the principal factor limiting the utilization of magnesium oxychloride cement (MOC) is its deficient water resistance. This limitation restricts its application primarily to building panels, facing slabs, industrial flooring, and fire insulation. Moreover, MOC is favored for rapid repair work due to its fast setting and hardening. Silica fume (SF) is a waste produced in large quantities during the manufacture of metallic silicon or ferrosilicon. In the presented research, MOC composites were produced using SF as a full weight and excess replacement for silica sand with replacement ratios of 100, 125 and 150 wt%. With regard to the fresh mix, the use of SF had a positive effect on its consistency as measured by the flow table test. The characterization of the hardened composites included mechanical, basic structural and thermal properties. The results showed that the SF content resulted in a substantial opening of porous structure of the composites which was followed by a decrease in mechanical parameters and a significant improvement in thermal insulation properties. Regarding the physical and mechanical parameters measured for the hardened composites, the optimal SF dosage was determined to be 125 wt% of silica sand, resulting in a mechanical resistant and thermal insulation material.
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