Review of Molar Ratio Variation on Compressive Strength of Stone Crushed Powder-based Magnesium Oxychloride Cement Mortar

Magnesium oxychloride cement (MOC) mortar is a specialized cementitious material that offers excellent fire resistance, high early strength, and durability. This study investigates the influence of molar ratio variation on the compressive strength of stone crushed powder-based MOC mortar. The molar ratio of magnesium oxide (MgO) to magnesium chloride (MgCl2) in the MOC mortar mixture plays a crucial role in determining its properties. Stone crushed powder is incorporated as a filler to enhance the mechanical performance of the cement matrix. The compressive strength is a key parameter that determines the load-bearing capacity and structural integrity of cement-based materials.a series of MOC mortar samples were prepared with varying molar ratios of MgO to MgCl2, ranging from 1:2.5 to 1:4. The stone crushed powder was added at a constant percentage by weight of the cementitious materials. The samples were subjected to compressive strength testing at different curing periods to evaluate the effect of molar ratio variation on the mechanical properties. The samples with this optimum molar ratio exhibited superior mechanical performance compared to those with higher or lower ratios. Furthermore, microstructural analysis using scanning electron microscopy (SEM) revealed variations in the hydration products and interfacial bonding between the cement matrix and stone aggregates, depending on the molar ratio.