Design and performance validation of high-performance cement paste as a grouting material for semi-flexible pavement

- Effects of compositions are analyzed on SFP grouting materials' properties.
- Optimal formulation ranges are determined for HPCP.
- Test method and evaluation indexes are proposed for grouting ability.
- Fluidity, strength, drying shrinkage and grouting ability of HPCP are validated.
- Two of optimal HPCPs are finally recommended as SFP grouting materials.

Semi-flexible pavement (SFP) has been applied in highway engineering for its good pavement performance. Many researches have been conducted on the performance differences between traditional pavement and SFP, but rarely focus on the composition of SFP materials, especially the composition of grouting materials. Therefore, this paper presents the study of composition design and performance validation of high-performance cement paste (HPCP) mixed with different types and dosages of additives as the grouting material for SFP. Results show that TH-928 polycarboxylate superplasticizer, UEA expansion admixture and ZY-99 saponin air-entraining agents have the different influences on the fluidity, strength and drying shrinkage of HPCP, and HPCP show good working capability with the compound addition of the three additives. Finally, the grouting materials were grouted into the matrix asphalt mixture to prepare SFP materials. The indexes, such as the grouting volume in per unit area, grouting depth and 7d residual porosity, were proposed to verify the grouting ability of selected materials. The verification results show that HPCP has the better grouting ability.

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