Research on the Performance of High Early Strength Quick RepairMortar for Shallow Layer of Airport Pavement

Abstract

In order to meet the requirements of non-suspend air construction of busy airports, the preparation of high early strength quick repairing mortar is of great significance to ensure on-time operation of aircraft and the safety of aircraft take-off and landing. The special cementing material is used to prepare quick repair mortar. It is obtained by optimizing the sand to binder ratio, the water to binder ratio and the proportion of admixtures. The mechanical properties, bond properties and durability of the repaired mortar are studied. Results indicate that Its 2 h compressive strength and flexural strength can reach 32.5 MPa and 4.8 MPa, respectively, and the bending strength reached 75% and 84% of the flexural strength at 2 h and 28 d, respectively. Compared with C40 concrete, the repair mortar has micro-expansion in the early stage, which can compensate for shrinkage and reduce the deformation difference between the old concrete. The shrinkage rate of the 120 d is reduced by 60.5%, and the wear resistance of 3 d can reach the wear resistance of C40 concrete for 28 d. At the same time, it has excellent impermeability and impact resistance.

Keywords

• airport pavement
• shallow damages
• quick repair
• high early strength mortar
• flight safety