Are GRC Manufacturer Products Prone to Cracking? Qinglong's GRC Anti-Cracking Technology Research

The cracking risk of GRC products can be effectively controlled through optimized mix proportions (fiber content 2%-3%), shrinkage control (drying shrinkage ≤0.6%), enhanced curing (humidity ≥90%), and proper design (provision of expansion joints). For high-quality GRC, crack width can be controlled at ≤0.1mm. By adding polypropylene fiber (volume fraction 0.1%), using expansion agent (dosage 6%-8%), and steam curing (80℃×24h), Qinglong GRC achieves 50% higher crack resistance than ordinary GRC.

Crack prevention measures: at the design stage, control panel size to ≤2m and provide expansion joints; at the production stage, reduce the water-binder ratio (≤0.35) and enhance curing; at the construction stage, avoid direct sunlight and strong wind conditions. One project using Qinglong GRC for five years has withstood seasonal temperature differences of 60℃ without any visible cracks. Scientific crack prevention delivers remarkable results.

Mix Proportion Optimization

Fiber reinforcement: steel fiber volume fraction 2%-3%, polypropylene fiber 0.1%; water-binder ratio control: ≤0.35 to reduce shrinkage; expansion agent addition: 6%-8% for shrinkage compensation; aggregate gradation: continuous gradation to reduce voids. Optimized mix proportions are the foundation.

Production Process Control

Uniform mixing: 3-5 min duration to avoid fiber balling; thorough vibration: expel air bubbles and reduce defects; uniform thickness: avoid stress concentration; adequate curing: humidity ≥90% for ≥7 days. Process control is the key.

Design Detailing Measures

Panel size control: ≤2m×2m to reduce restraint; joint provision: expansion joint spacing ≤6m; reinforcement enhancement: add reinforcement in crack-prone areas; structural form: avoid sharp corners and abrupt changes. Proper design prevents cracking.

Construction Protection Measures

Avoid direct sunlight: construction temperature 5-35℃; wind protection: stop work at wind force ≥5; timely curing: begin curing after final setting; proper support: avoid early loading. Construction protection is indispensable.

Scientific prevention and control avoid cracking. Qinglong GRC features systematic crack prevention, with stable and reliable products.