What Is the Production Process of GRC? An In-Depth Analysis of Qinglong GRC Manufacturing Technology

The GRC production process mainly consists of four key stages: batching, mixing, forming, and curing. Each stage has strict technical requirements, and the level of workmanship directly affects product quality.

In the Wuhan Han Show Theatre project, Qinglong's GRC production line demonstrated advanced workmanship: the automatic batching system achieves a precision of 0.1%; the spray-up forming machine ensures three-dimensional uniform fiber distribution; the vacuum dewatering system improves compactness; and the intelligent curing kiln precisely controls temperature and humidity. This precision workmanship keeps the product strength variation coefficient within 5% and achieves artist-grade surface quality.

Batching Process Control

An automatic batching system with a precision of ±0.5% is adopted. Dry material mixing time is ≥2 minutes. Fibers are added in batches to ensure uniform dispersion. Water dosage is strictly controlled, with a water-cement ratio of 0.3–0.35.

Mixing Process Requirements

A forced-action mixer is used for 3–5 minutes. The feeding sequence is controlled to avoid fiber clumping. Discharge temperature does not exceed 35℃. Workability is tested to ensure construction requirements are met.

Forming Process Technology

Spray-up forming pressure is 0.4–0.6 MPa. Vacuum dewatering improves compactness. Robotic operation ensures uniformity. Thickness control precision is ±1 mm.

Curing Regime Optimization

Ambient temperature curing for 24 hours. Heating rate during temperature-rise curing ≤15℃/h. Constant temperature curing for 48 hours. Cooling rate during temperature-drop curing ≤10℃/h. This regime ensures proper strength development.

Advanced workmanship requires the support of a sound quality system. It is recommended to choose manufacturers with mature processes to ensure product quality.