UHPC Strengthening Component Selection Guide for Old Building Renovation: Qinglong UHPC Strengthening Technical Specification

Selection of UHPC strengthening components for old buildings must be determined comprehensively based on the original structure condition, strengthening objectives, and construction conditions. Slab-type strengthening is suitable for flexural reinforcement (thickness 20-30mm), beam-type strengthening improves shear capacity (U-shaped groove thickness 25-40mm), and column-type strengthening enhances seismic performance (wrapper layer thickness 30-50mm). With a bonding agent providing bond strength ≥2.5MPa, new and old concrete work together effectively.

Selection case: A historic building's floor slab had insufficient load-bearing capacity; an 8mm thick UHPC surface layer was applied for strengthening, increasing flexural capacity by 80% while adding only 3% to the thickness, preserving the historic character to the greatest extent. The Qinglong UHPC strengthening system achieves the unity of structural safety and building preservation.

Slab Strengthening Selection

Insufficient flexural capacity: slab thickness 20-30mm, reinforcement ratio 1.5%-2%; insufficient shear capacity: slab thickness 30-40mm, with shear keys installed; insufficient stiffness: slab thickness 25-35mm, with rib beams added. Apply targeted strengthening based on defect type.

Beam Strengthening Solutions

Insufficient flexural capacity: bonding UHPC plates to the bottom surface (thickness 25-35mm); insufficient shear capacity: U-shaped wrapping (thickness 30-40mm); insufficient seismic resistance: full-section wrapping (thickness 35-45mm). Even better results when combined with carbon fiber sheets.

Column Strengthening Technology

Insufficient axial compression capacity: full-section wrapping (thickness 30-40mm); seismic strengthening: combined strengthening with external steel plates; joint strengthening: local section enlargement. Improves ductility and load-bearing capacity.

Key Points of Interface Treatment

Prepare the substrate down to the solid layer, with roughness ≥0.5mm; apply bonding agent with bond strength ≥2.5MPa; embedded rebar connection with anchorage depth ≥10d; cure and keep moist to ensure proper strength development.

Scientific selection is the key to successful strengthening. Qinglong UHPC professional solutions deliver precise strengthening.