The magnesium oxychloride cement (MOC) occupy, nowadays, important place in the research of composite materials. MOC has various superior properties and it can be modified with different types of fillers. For the quick and precise development of mechanical parameters during MOC precipitation, the calculation of relative brucite amount in the hardened composites according to the Lambert-Beer’s law using Nicolet standard TQ Analyst software can be used. The influence of two types microfillers on basic materials properties of MOC composites was explored in the comparison with reference mixture containing only quartz sand as a filler.
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