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Semi-flexible pavement (SFP) combines the best features of both flexible asphalt and rigid cement concrete pavement. SFP consists of a porous asphalt mixture skeleton with 25 %-35 % voids, filled with selected cement slurry. To better balance the flexible and rigid characteristics between the asphalt mixture skeleton and hardened cement paste in SFP, a further understanding of its cement slurry formulation design is required. Results indicate that the penetrant has a significant effect on the fluidity of cement slurry, improving the flowability of cement slurry.