What Are the Key Points in the Production Process of High-Strength GRC Panels? Full-Process Quality Control

The production process of high-strength GRC panels (flexural strength ≥20MPa, compressive strength ≥40MPa) centers on four key areas: "raw material control, fiber dispersion, forming technology, and curing." With automated production lines and refined management, Qinglong achieves a 99.5% pass rate for high-strength GRC panels, and its products have been adopted by major projects such as the Shenzhen Pingshan High-Tech Zone and the Guangxi New Media Center.

1. Precise Raw Material Control: The Foundation of Strength

Raw material quality determines the upper limit of high-strength performance. Cement selection: low-alkali sulphoaluminate cement (strength grade ≥52.5) with alkali content ≤0.6% is used; Qinglong tests cement strength and alkali content before it enters the plant and directly rejects non-conforming batches. Aggregate screening: high-purity quartz sand (mud content ≤0.3%) with continuous grading of 0.15-0.6mm; Qinglong's aggregates undergo dual treatment of washing and sieving, achieving a 99% impurity removal rate. Fiber selection: high alkali-resistant glass fiber (alkali resistance retention ≥90%), 12mm in length, at a dosage of 2.8-3.0%; Qinglong uses automatic dispersion equipment for fibers to prevent agglomeration. Admixture matching: polycarboxylate superplasticizer (dosage 0.8-1.2%) reduces the water-cement ratio to 0.4-0.45; Qinglong's admixture-cement compatibility test pass rate is 100%.

2. Uniform Fiber Dispersion and Forming Technology: The Core of Structural Reinforcement

Fiber dispersion and forming directly affect strength uniformity. Fiber dispersion: a twin-shaft forced mixer combined with air-flow dispersion technology is used, with a mixing time of 8-10 minutes; Qinglong's fiber distribution uniformity reaches 98% with no localized gaps. Forming process: spray forming combined with high-pressure vibration (pressure ≥0.6MPa) ensures a dense slurry and tight bonding between fibers and aggregates; Qinglong precisely controls spray pressure at 0.6-0.8MPa with a vibration frequency of 50Hz. Thickness control: positioning pins are set according to design thickness with an error of ≤±1mm; Qinglong uses laser thickness gauges for real-time monitoring of large panels. Defect control: vacuum degassing removes internal air bubbles; Qinglong's bubble rate after vacuum degassing is ≤2%, avoiding weak strength points.

3. Curing and Quality Testing: The Key to Stable Performance

Curing and testing ensure that strength meets standards and remains stable. Steam curing: temperature 45-50°C, humidity ≥95%, curing for 48 hours; Qinglong's steam curing kilns use intelligent temperature control with a precision of ±1°C. Later-stage curing: natural curing for ≥14 days to avoid early loading; Qinglong covers panels with geotextile for moisture retention during later-stage curing, ensuring uniform strength growth. Factory testing: 5 specimens are sampled per batch to test flexural and compressive strength; Qinglong's high-strength GRC panels achieve a measured flexural strength of ≥22MPa and compressive strength of ≥45MPa. Durability testing: freeze-thaw resistance of ≥300 cycles, and strength retention of ≥90% after 1000 hours of UV aging; Qinglong's durability testing coverage is 100%. Project case: the 30mm-thick high-strength GRC curtain wall panels at the Shenzhen Pingshan High-Tech Zone Comprehensive Service Center achieved a flexural strength of 23MPa; after installation, they withstood typhoon loads without deformation, and the project won the Luban Award.