Study on the Properties of Alkali-activated Gold Tailings 3D Printing Concrete

The activity of gold tailings was activated by alkali activation method. Cement and gold tailings were used as cementitious materials to prepare 3D printing concrete. The mechanical properties and rheological characteristics of the slurry were measured to evaluate its performance during 3D printing. The results showed that when the content of gold tailings was approximately 1:1 with the amount of cement, the 28-day strength reached 31.9MPa, and the concrete had the best performance during 3D printing. The lateral deflection of the cylindrical components printed with gold tailings concrete was more than 50% lower than that of traditional concrete, the structural integrity was higher, and the printing open time was within a reasonable range.