What Are the Key Points of the Production Process for High-Strength GRC Panels? Strength Enhancement and Qinglong Group's Manufacturing Technology

The key points of the production process for high-strength GRC panels (flexural strength ≥18MPa) focus on three major aspects: "low water-cement ratio control, uniform fiber distribution, and efficient curing". The water-cement ratio must be strictly controlled at 0.30-0.33, fiber volume content at ≥4%, and the steam curing regime (60℃×24h) executed with an error of ≤±2℃. In the production of red curtain wall panels for the Wuhan Hanxiu Theater, Qinglong Group achieved a product strength dispersion coefficient of ≤5% and a stable 28-day flexural strength of 20-25MPa through vacuum dewatering technology (vacuum degree -0.08MPa), robotic directional spraying (fiber distribution uniformity ≥95%), and intelligent curing kilns (humidity ≥95%). High strengthening not only expands the application boundaries of GRC, but also makes structural lightweighting possible.

Precise Mix Proportion Design and Optimization

Total cementitious material ≥800kg/m³, silica fume content 20-25%, and water reducer preferably polycarboxylate type (water reduction rate ≥30%). We optimized the mix proportion through response surface methodology, achieving a strength compliance rate of 99.5% in the Shenzhen Yirui Biotech Building project.

Production Process and Equipment Assurance

A twin-shaft compulsory mixer is used (rotation speed 120rpm) with a mixing time of 5-8 minutes. Vacuum dewatering expels air bubbles, keeping the air content ≤3%. Qinglong Group introduced a German production line to achieve digital control of process parameters.

Curing Regime and Strength Development

The heating and cooling rates of steam curing are ≤15℃/h to avoid thermal cracks. We have established a strength development curve database to accurately predict strength at various ages. Scientific processes are the cornerstone of high-strength GRC.