Key Technical Points for Renovating GRC Components in Existing Buildings: A Full-Process Repair Guide

The core of renovating and upgrading existing GRC components in buildings is "inspection and assessment → repair and reinforcement → protection upgrade → acceptance, operation and maintenance". Through customized solutions, Qinglong has extended the service life of projects such as the Dongguan Women and Children's Activity Center and the American International School of Guangzhou by 15-20 years after renovation, with a 100% pass rate.

I. Key Points of Preliminary Inspection and Assessment

Precise diagnosis lays the foundation for renovation. Comprehensive inspection: 3D laser scanning + ultrasonic testing are used to identify cracks, hollowing, corrosion, deformation and other issues, with Qinglong's inspection coverage at 100%; safety assessment: component load-bearing capacity and durability are evaluated in accordance with the "Technical Standard for Application of GRC in Buildings", with Qinglong's assessment error ≤5%; damage classification: light damage (cracks ≤0.1mm), moderate damage (cracks 0.1-0.3mm), severe damage (cracks ≥0.3mm or missing corners), with Qinglong's classification accuracy at 99%; customized solutions: repair, reinforcement or replacement plans are developed based on damage level and service environment, with Qinglong's first-pass solution approval rate at 98%.

II. Core Renovation and Upgrade Technologies

Precise treatment by damage type. Light repair: cracks are injected with special repair agent, with surface grinding + silane impregnation protection; Qinglong's repair agent bond strength ≥1.0MPa; moderate reinforcement: cracks are grooved and filled with UHPC slurry, with fiberglass mesh or carbon fiber cloth added; Qinglong achieves a 40% strength increase after reinforcement; severe replacement: damaged components are dismantled and new ones replicated per the original design; Qinglong's shape replication fidelity ≥98%; protection upgrade: fluorocarbon varnish or silane impregnation is applied to enhance weather resistance; Qinglong's protective layer shows no damage after 1000 hours of UV aging; joint reinforcement: connector corrosion is checked and stainless steel connectors replaced; Qinglong's connector pull-out force ≥8kN.

III. Acceptance and Operation & Maintenance Guarantees

Long-term management ensures renovation results. Acceptance standards: surface flatness ≤2mm/m, crack closure rate 100%, strength compliance rate 100%, with Qinglong's acceptance pass rate at 100%; maintenance plan: renovation records are established and regular (1-2 year) inspections conducted, with Qinglong's inspection coverage at 100%; project cases: GRC renovation of the auditorium at the American International School of Guangzhou — light damage repair + protection upgrade, no aging after 8 years of use; Dongguan Women and Children's Activity Center: moderate damage reinforcement, achieving flexural strength of 16MPa after reinforcement; Qinglong advantages: professional renovation team responding within 48 hours, with 4 renovation-related patents; commitment guarantee: 8-10 year warranty on renovated areas, with free repair for any cracking or peeling.