Abstract: In order to use vanadium-titanium metallurgical slag， reduce waste storage and resources waste. Non-clinker cementitious materials were prepared by Chengde vanadium-titanium slag， steel slag and desulfurization gypsum. The influence of different vanadium-titanium slag content and different curing temperature on compressive strength of mortar sample was investigated. The hydration mechanism of the non-clinker cementitious materials was analyzed. The prepared cemented matrix has the highest compressive strength when the water to binder ratio is 0.38， and vanadium-titanium slag， steel slag， desulfurization gypsum account for 58%、30%、12% of the cementitious materials， respectively. Curing temperature had significant effect on the early strength of mortar test samples， the curing temperature increased from to 45 ℃， the 3 d comprehensive strength of mortar with curing temperature 30 ℃ is 1.85 times of 3 d comprehensive strength of mortar with curing temperature 45 ℃. The analysis of XRD， SEM and IR showed that hydrated products were mainly ettringite (AFt) and C-S-H gel. As the hydration reaction progresses， the number of hydration products increases， and the C-S-H gel grows alternately with AFt， which making the structure dense constantly， thus ensuring the strength of the mortar text sample.

Key words: Non-clinker cementitious materials, Vanadium-titanium slag, Ettringite, C-S-H gel