Abstract: In order to explore the possibility of using Anshan steel slag & iron slag as main raw materials to produce the non clinker slag cement,orthogonal test is conducted to verify different periods of concrete compressive strength with the steel slag to iron slag mass ratio A,ascade mixed grinding fineness B,Ca(OH)₂ and gypsum mass ratio C,heat curing temperature D as variable factors.Meanwhile,the XRD spectra of cementitious materials and SEM photo of paste blocks are analyzed.The results showed that：when the A,B,C,D were 1∶2 480 m²/kg,2∶1 and 35 ℃,the cement obtained the highest compressive strength,and its compressive strength were 18.36,26.89,45.32 MPa after curing 3,7,28 days respectively.The strength impact of these four factors on the sample is D>A>B>C.②The early strength of the cement system roots in C-S-H gel and a small amount of ettringite；Its later strength mainly depends on the generation of ettringite.

Key words: Non clinker steel &, iron slag cement, Cascade mixed grinding, Heat curing temperature, C-S-H gel, Ettringite