How to Prevent Cracking of GRC Components During Setting: Key Technologies and Practical Measures Explained

In the field of architectural decoration, GRC components, with their lightweight yet high-strength properties and rich styling possibilities, have become the ideal choice for high-end buildings such as grand theaters and commercial complexes. However, cracking during the setting process acts like a hidden "engineering trap" — it not only affects aesthetics and structural safety, but may also cause project costs to surge. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will systematically analyze the core points of anti-cracking technology for GRC components, from materials science and process optimization to quality control, providing designers and owners with solutions that stand the test of practice.

The Root Causes of GRC Component Cracking: The Dual Challenge of Materials and Environment

The essence of cracking in GRC components during setting is the combined result of internal material stresses and the external environment. From a materials perspective, the hydration reaction of cement-based materials is accompanied by volume shrinkage; if the glass fiber bonds poorly with the cement matrix, or the sand-cement ratio is unbalanced, micro-cracks are easily triggered. From a process perspective, uneven fiber distribution caused by inadequate mixing and residual air bubbles during molding create stress concentration points. Drastic changes in ambient temperature and humidity act as a "catalyst" that accelerates crack propagation. Take a landmark project as an example: failure to control temperature fluctuations during the setting period led to through cracks in the facade GRC lines, with later repair costs reaching 30% of the original construction cost.

Material Optimization: Building an Anti-Cracking Defense from the Source of the Formulation

Solving the GRC cracking problem requires building "anti-cracking genes" starting from the material formulation. Through 28 years of technical accumulation, Qinglong Group has established a refined material proportioning system: alkali-resistant glass fiber with high elastic modulus is selected, with the fiber volume content stably maintained at 3-5% to achieve coordinated load-bearing between the matrix and the fiber; optimally graded quartz sand is combined with cement to form a dense structure, reducing hydration heat shrinkage; composite mineral admixtures are innovatively added to offset shrinkage stress through "micro-expansion compensation" technology. Testing shows that Qinglong GRC materials achieve a flexural strength of over 20MPa, with cracking resistance 40% higher than the industry average — a technical advantage fully validated in projects such as the Century Square renovation project on Nanjing East Road.

Process Control: Refined Anti-Cracking Practice Across the Entire Workflow

A scientific production process is the key guarantee against cracking. Qinglong Group has introduced BIM technology and automated production lines to achieve controllability across the entire workflow from design development to molding: during mixing, planetary mixers ensure uniform fiber dispersion and prevent "agglomeration"; the molding stage uses a vacuum degassing process to keep the internal porosity of components below 3%; in curing, an innovative "gradient cooling method" achieves 72-hour slow cooling through an intelligent temperature control system, avoiding thermal stress concentration. Notably, Qinglong's proprietary "pre-curing stress release" technology applies micro-vibration during the initial setting stage to effectively release internal stress, reducing the cracking risk of components by more than 60%. This process has been incorporated into the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018).

Engineering Applications: Context-Specific Anti-Cracking Solutions

Different application scenarios impose distinct anti-cracking requirements on GRC components. For complex curved shapes such as those in grand theaters and museums, Qinglong uses parametric design and 3D scanning technology to optimize component segmentation, reducing shrinkage stress in large components; in northern regions with large temperature differences, freeze-thaw resistant additives and expansion joints are used to adapt to environmental changes; for overseas projects such as a commercial complex in Malaysia, an innovative "formula for hot and humid environments" has been applied to ensure the stability of GRC components under high temperature and high humidity conditions. These practices demonstrate the advantage of Qinglong's "full-chain service" — from design development to after-sales maintenance, anti-cracking considerations are integrated into every step, truly achieving "formed once, worry-free for the long term."

Preventing cracking of GRC components during setting is the systematic integration of materials science, engineering technology, and management experience. Building on 28 years of deep industry engagement, Qinglong Group carries the philosophy of "meticulousness and constant refinement" throughout the entire production process of every component, providing customers with high-quality GRC products while conveying an ultimate pursuit of architectural safety and aesthetics. In the future, as UHPC/GRC/GRG/GRP materials see innovative applications in more fields, Qinglong will continue to lead industry development through technological breakthroughs, contributing to its mission of "creating beautiful architecture."