Airport Runway Repair Material Airport Rapid Slab Replacement Repair Material

Airport runway repair material is a high-performance substance specifically engineered for rapid restoration of pavement damage. Its core characteristic lies in ultra-early strength properties, achieving compressive strength exceeding 20MPa within 4 hours to meet emergency takeoff and landing requirements for fighter aircraft. Through composite admixture technology, this material optimizes the hydration reaction process, enabling normal setting even in low-temperature environments of 5°C, breaking through the limitations of long curing cycles associated with traditional cement-based materials.

During airport runway slab replacement operations, this material demonstrates exceptional construction adaptability. Designed with self-leveling properties, it achieves a slump of over 220mm, completely filling irregular crater cavities without requiring vibration. Its initial setting time is controlled at 45 minutes, providing ample operational flexibility, while forming a rigid load-bearing surface just 1 hour after final setting. Compared to traditional epoxy resins, this inorganic material exhibits thermal expansion coefficients perfectly matching concrete substrates, preventing interfacial debonding caused by thermal stress.

Addressing specific crater repair conditions, the material incorporates dual reinforcement systems with steel fibers and polypropylene fibers to enhance impact resistance. Laboratory data shows that with 1.5% volumetric dosage of deformed steel fibers, the repair body achieves flexural strength of 7MPa, with toughness index increasing by 300% compared to baseline groups. In wheel tracking tests simulating aircraft loads, after 8000 cyclic loadings, the repaired areas showed no edge spalling or settlement phenomena.

Specialized mixing equipment ensures precise proportioning and blending of powder and water, with water-binder ratio consistently maintained at 0.28. Flow tests indicate the material can completely cover a 5-square-meter work area within 3 minutes, while its self-leveling characteristics ensure microscopic mechanical interlocking with existing concrete interfaces. The repair body reaches 90% of design strength within 24 hours, forming a complete load-bearing system with the base concrete.

During curing, the material maintains slight volumetric expansion within 0.02%-0.04%, effectively compensating for shrinkage stress. Testing reveals the repair interface achieves P12 impermeability grade, with surface scaling less than 0.1kg/m³ after 300 freeze-thaw cycles. Under sustained loading, elevation differences between repaired areas and adjacent pavement remain within the 2mm specification limit.

This specialized repair material resolves key technical contradictions in emergency repairs through materials science design: requiring extremely short traffic opening times while ensuring long-term durability. Its composition includes active mineral admixtures with specific particle size distributions, rapidly forming strength frameworks while continuously undergoing secondary hydration to fill capillary pores. Microstructural analysis shows the 56-day aged repair material paste density reaches 2.38g/cm³, significantly higher than conventional rapid-hardening cement-based materials.

In practical applications, the repair system maintains coordinated deformation capacity with existing pavement. Dynamic deflection testing indicates that under simulated aircraft loads, the deflection basin curves between repaired areas and adjacent pavement remain continuous and smooth without stress concentration phenomena. Through optimized particle gradation, the material achieves 78% vibration compaction density, ensuring high-density structure formation under impact compaction techniques.