Dynamic Properties of Magnesium Oxychloride-Titanium Gypsum Mineral Material after Freeze-thaw Cycles

Magnesium oxychloride cement (MOC)-based titanium gypsum (TG) composite material is a new type of green and energy-saving material. To reveal the uniaxial compressive strength and impact dynamic properties of MOC-TG composite material after multiple freeze-thaw cycles, an electromagnetic-driven Hopkinson bar impact test and a microcomputer-controlled electro-hydraulic servo universal testing machine were used to analyze the strength variation characteristics of MOC composite material with 30% TG after 0, 10, 20, 30, and 40 freeze-thaw cycles. Results show that with the increase in the number of freeze-thaw cycles, both the dynamic impact strength and uniaxial compressive strength of the MOC-TG composite material first increase and then decrease. The ductility of MOC is significantly improved after the addition of TG, and the MOC-TG composite material exhibits good frost resistance. The conclusions obtained in this study can provide a reference for improving the frost-thaw damage resistance of MOC-TG and its strength characteristics after multiple freeze-thaw cycles.