Effect of Liquid Environment on Hydration Activity of Ternesite–Dicalcium Silicate Composite Minerals

The hydration activity of ternesite–dicalcium silicate composite minerals in deionized water, NaAlO₂, Li₂CO₃ and MgSO₄ was investigated. The results show that the presence of 1 mol/L [Al(OH)₄]^– ions in liquid significantly improves the hydration activity and accelerates the hydration of ternesite–dicalcium silicate composite minerals due to the formation of ettringite, and enhances the strength of ternesite. The strength of hydration products is 44% higher than that in deionized water. However, the presence of 0.1 mol/L Li⁺ ions in liquid inhibits the hydration, and the strength of hydration product is only 26% of that in deionized water. The presence of 1 mol/L Mg²⁺ ions in liquid improves the hydration activity of ternesite–dicalcium silicate composite minerals from 28 d to 56 d, but it inhibits the hydration activity after 56 d.