I. Material performance optimization mechanism

1. Mechanical performance enhancement

Discretely distributed microfibers form a spatial network through three-dimensional overlap, which effectively constrains the expansion of microcracks in the cement matrix, increases the flexural strength by 40-60%, and improves the fatigue resistance under dynamic load by more than 3 times.

2. Durability breakthrough

Hydrophobic polypropylene fiber can block the water penetration path, and the mass loss rate after 500 freeze-thaw cycles is less than 2%, and the strength retention rate after 1000 hours of ultraviolet irradiation exceeds 90%.

3. Chemical stability performance

After plasma treatment, the fiber surface forms a chemical bond with the cement hydration product, and there is no sign of corrosion in the pH range of 2-12, and the sulfate corrosion resistance level reaches the highest level of KSF 5405 standard.

II. Engineering application evidence

1. Building structure engineering

When used for casting shear walls of super high-rise buildings, it can reduce 50% of temperature shrinkage cracks; in the joint treatment of prefabricated buildings, the bonding strength reaches 7.5MPa in 28 days.

2. Transportation infrastructure

After adding 0.9% volume ratio of fiber to highway repair material, the wear resistance index is increased to 82, which prolongs the service life by 3-5 years compared with ordinary mortar.

3. Special environmental engineering

When this material is used in the protective layer of cross-sea bridge piers, the chloride ion diffusion coefficient is reduced to 1.2×10-12m2/s, meeting the 50-year design life requirement of the marine environment.

III. Key points of construction technology

The fiber content should be controlled in the range of 0.1-1.2%, and the mixing time of a forced mixer should be no less than 3 minutes. After pouring, high-frequency vibration should be used to ensure the directional distribution of fibers, and secondary smearing should be carried out before final setting to optimize the surface density.