Complete Analysis of UHPC Shaped Component Surface Repair Methods: Qinglong UHPC Professional Repair Technology System

Surface repair of UHPC shaped components adopts differentiated solutions based on damage type: micro-cracks (width ≤0.2mm) are treated with low-pressure grouting, holes (diameter ≤20mm) with special repair mortar, and damaged areas with cast-in-place repair. Repair materials achieve compressive strength ≥150MPa, bond strength ≥2.5MPa, and color difference ΔE≤3.0, delivering a "restored as new" effect.

Repair process standards: substrate treatment to Sa2.5 grade, application of interface agent (bond strength ≥1.5MPa), layered repair (each layer ≤10mm thick), curing temperature 20±5℃. After one sculpture was repaired, testing showed a bond strength of 3.2MPa, normal 28-day strength development, and an appearance consistent with the original component. Qinglong UHPC repair technology restores component performance and extends service life.

Micro-crack Pressure Grouting Technology

Grouting pressure 0.2-0.5MPa, slurry fluidity ≥260mm. Ultrafine cement-based slurry offers good permeability. Surface treatment after grouting ensures flatness.

Layered Hole Repair Process

V-shaped grooving with depth ratio ≥3:1. Substrate moistened without standing water, compacted in layers. Surface finished flush with the original. Adequate curing prevents shrinkage cracking.

Cast-in-Place Repair of Damaged Areas

Formwork is set to ensure geometric dimensions. Micro-expansive mortar compensates for shrinkage. Vibration compaction avoids voids. Joint areas are treated after formwork removal.

Color Difference Control Measures

Repair materials with the original mix proportion are prefabricated in batches. Trial mixing before construction adjusts color. Overall treatment after repair unifies the color tone. Protective coating improves durability.

Professional repair restores component performance. Qinglong UHPC's comprehensive technical system safeguards quality throughout the project's full life cycle.