Abstract:In order to study the influence of lithium slag content on the cement based composites, six groups of experiments were designed, keeping water binder ratio 0.35, sand binder ratio 0.3 and fiber content 2% unchanged, and the lithium slag content was 0.2, 0.3 and 0.4 respectively, and fly ash was used as control group, and uniaxial tensile test and compression test were carried out, then the grey correlation method was used for analysis of the test. The results show that when the content of lithium slag is below 0.3, and the workability is good, once above 0.4, the viscosity is enhanced and the workability is poor; With the increase of lithium slag and fly ash content, the elongation, tensile strength and compressive strength of the composites increase first and then decrease, and the optimum content is 0.3; Grey correlation analysis shows that the content of lithium slag and fly ash has obvious influence on elongation and tensile strength, and has certain influence on compressive strength. In conclusion, it is feasible to use lithium slag instead of fly ash to prepare cement based composites.