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Study the effects of different admixtures and different dosages on Basic Magnesium Sulfate Cement (BMS) composite sheets, the effects of sodium citrate and phosphoric acid on the flexural strength and compressive strength of basic magnesium sulfate cement sheets were studied, XRD and SEM were used to analyze the composition and microstructure of hydration products. The results show, the addition of admixtures has a great influence on the properties of composite sheets. Adding the corresponding proportion of admixture to the plate, the mechanical properties are significantly improved. Therefore, the properties of sheet metal can be greatly improved by choosing appropriate additives.

Magnesium oxysulfide cement (MOS) is an emerging building material. The application of MOS in practical engineering is affected by the low mechanical properties, which can now be modified by some admixtures. In this paper, the mechanical properties and hydration heat release of citric acid (CA)-modified MOS were studied, and the phase composition and microstructure of hydration products were analyzed by SEM and XRD. The results show that the addition of CA modified MOS can reduce MgO direct hydration of Mg(OH)2, promote the formation of a large number of needle-shaped 5Mg(OH)2 ·MgSO4·7H2O (5·1·7) phase crystals, and the compressive strength is greatly improved. When the CA dosage is 0.5%, the mechanics of MOS Best performance. The clotting time of the MOS modified with CA is slightly prolonged.

Adding different types and amounts of water reducing agent to Dolomite-based magnesium sulfate cement (DBMSC), and analysing the effect of water reducing agent on DBMSC by studying its setting time, water reduction effect and mechanical strength. on the one hand, Experimental results show that adding water reducing agent to DBMSC has a retarding effect on dolomitic magnesium sulfate cement, and reduces the hydration heat of cement; on the other hand, the water reduction effect of the water reducing agent on DBMSC prepared by light burning dolomite is not too obvious, and even the mechanical strength of DBMSC is lowered.