Effect of α-MgO/MgSO₄, Sodium Citrate, and Calcium Stearate on the Properties of Magnesium Oxysulfate Foam Concrete

Leveraging the unique advantages of magnesium sulfate cement (MOS) and advancements in insulation materials, this study investigates the preparation of magnesium oxysulfate cement foam concrete (MOSFC) using a chemical foaming method, aiming to achieve rapid solidification and high early strength.To systematically assess its mechanical and physical properties, the effects of modifier (sodium citrate) and foam stabilizer (calcium stearate) content on basic MOSFC were examined.Key performance metrics, including 28-day compressive strength, thermal conductivity, volumetric water absorption, softening coefficient, and microscopic morphology, were evaluated.The results indicate that at a molar ratio of -MgO/MgSO 4 = 6, MOSFC achieves optimal compressive strength and minimal thermal conductivity.The hydration behavior of these mixtures in the MOSFC slurry governs its performance, primarily influenced by three factors: slurry apparent density, internal pore structure, and the bonding interactions among the solid, gas, and liquid phases.