Abstract:In order to improve the treatment effect of void at the bottom of cement concrete pavement, the analytic hierarchy process (AHP) and the fuzzy mathematics theory are used to establish a multi-level fuzzy comprehensive evaluation model for the optimal scheme of cement pavement grouting material. The fly ash and desulfurized gypsum are selected to replace the cement in an appropriate proportion to prepare the cement pavement grouting material. And the established comprehensive evaluation model is used to comprehensively evaluate the selection schemes of cement pavement grouting materials. The superiorities of 10 compared schemes are obtained. The maximum superiority is 71.61%, and the minimum superiority is 21.75%. In order to verify the rationality of the model, the corresponding schemes with the superiorities of 71.16%, 70.92%, 70.83% and 21.75% are selected to repeat the experiments. The results show that the model has good repeatability, can accurately reflect the effect of grouting material in the treatment of slab bottom void, and has the good engineering application value.