When Is the Best Time to Demold GRC Components: Influencing Factors and Practical Guide

In the production and manufacturing of GRC components, controlling the demolding timing directly affects product quality and production efficiency. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has developed a scientific demolding timing judgment system based on more than a thousand engineering projects, helping the industry solve this core technical challenge.

Scientific Basis for Determining the Demolding Timing of GRC Components
GRC stands for Glass Fiber Reinforced Concrete, and its demolding timing must simultaneously meet the dual requirements of strength development and process feasibility. Through 28 years of accumulated engineering data, Qinglong's technical team found that when a component reaches a curing age of 72 hours and a compressive strength of ≥15MPa, this constitutes the basic demolding condition for conventional GRC components. However, in actual operation, judgment must be made comprehensively based on the material mix ratio (glass fiber content is typically controlled at 4-5%), ambient temperature and humidity (optimal curing temperature 20-25°C, humidity ≥90%), and component complexity. For example, double-curved shaped components require an extended curing time of 12-24 hours.

Four Key Factors Affecting GRC Demolding Quality
In terms of material properties, Qinglong's self-developed low-alkalinity sulfoaluminate cement-based GRC material improves early strength by 30% compared with traditional Portland cement systems, shortening the demolding cycle by 15%. In terms of production processes, components made with vacuum mixing and spray molding technology have higher density, allowing the demolding strength threshold to be lowered to 12MPa. Regarding environmental control, the constant temperature and humidity curing kilns at the Guangxi Nanning production base use an intelligent temperature control system to keep curing temperature differences within ±2°C, ensuring uniform strength development. Component design factors are equally important: GRC components with a cross-section thickness exceeding 80mm require temperature measuring holes for real-time monitoring of internal temperature, preventing cracking caused by excessive temperature differences between the interior and exterior.

Demolding Practice Guide for Different Types of GRC Components
For European classical style architectural decorative lines (such as Roman columns and cornice lines), Qinglong adopts a step-by-step demolding process: side molds are removed first (strength ≥8MPa), followed by bottom molds after 24 hours (strength ≥15MPa), effectively avoiding stress concentration. Garden landscape components (benches, sculptures) place emphasis on surface texture protection; a specially formulated polymer release agent is used during demolding, together with elastic suction cup tools, reducing the surface damage rate to below 0.3%. For large exterior wall cladding panels (with single panel areas up to 10m²), Qinglong's original "pre-demolding" technology conducts a 10% load test before formal demolding to ensure anchoring point strength meets standards. For more industry information: +WeChat qlfsbl123

Qinglong's Solution for Demolding Quality Control
As a contributing editor of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong has established a full-process quality traceability system: each GRC component is embedded with an RFID chip that records data throughout the entire process from raw material mixing to curing and demolding. By using BIM technology to simulate demolding stress distribution and optimize mold design in advance, the first-time demolding pass rate of GRC components for a commercial complex project in Guangdong was raised to 99.2%. During the after-sales maintenance stage, for micro-cracks that may occur during demolding, Qinglong provides 20 years of free inspection services, using ultrasonic flaw detection technology for regular monitoring.

Mastering the demolding timing of GRC components requires the coordinated efforts of materials science, structural engineering, and production management. Qinglong Group will continue to leverage its technical advantages as a National High-Tech Enterprise and a provincial-level R&D center, providing full-chain services covering "detailed design - manufacturing - construction and installation" to deliver expert-level solutions for designers and owners, from technical consultation to lifetime maintenance, and to promote the innovative application of GRC materials in high-end architectural decoration. For more industry information: +WeChat qlfsbl123