Study on Crack Resistance of GRC Products — Qinglong's GRC Anti-Crack Technology Breakthrough

The crack resistance of GRC products can be effectively improved through optimized mix proportions (fiber content 4%-5%), shrinkage control (drying shrinkage ≤0.6%), enhanced curing (humidity ≥90%), and rational design (provision of expansion joints). High-quality GRC can keep crack width within ≤0.1mm. Qinglong GRC, by adding polypropylene fibers (volume fraction 0.1%), using expansive agents (dosage 6%-8%), and steam curing (80℃×24h), achieves 50% better crack resistance than ordinary GRC.

Anti-cracking measures: at the design stage, control panel size ≤2m and provide expansion joints; at the production stage, reduce the water-binder ratio (≤0.35) and enhance curing; at the construction stage, avoid strong sunlight and high-wind conditions. One project has used Qinglong GRC for five years, withstanding 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; expansive 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: 3-5min duration to prevent fiber clumping; thorough vibration: expel air bubbles and reduce defects; uniform thickness: avoid stress concentration; adequate curing: humidity ≥90%, duration ≥7d. Process control is key.

Design and Structural Measures

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

Construction Protection Measures

Avoid strong sunlight: construction temperature 5-35℃; wind protection: stop work when wind force ≥level 5; timely curing: begin curing after final set; proper support: avoid early loading. Construction protection is essential.

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