When Is the Best Time to Demold GRC Components? How to Judge Accurately and Control Scientifically

Precise Control of GRC Component Demolding Timing: A Scientific Judgment Guide Based on 28 Years of Industry Experience

In the production of GRC components, controlling the demolding timing is like mastering the heat in cooking—it directly determines the final product quality. Demolding too early can easily lead to component deformation and cracking, while demolding too late may cause mold damage or surface sticking. The scientific control of this process step is one of the key technologies distilled from Qinglong Group's 28 years of full-chain experience. As a leading large-scale GRC material supplier in China, we will systematically analyze how to achieve precise judgment of GRC component demolding timing from three dimensions: material properties, environmental factors, and process parameters.

Core Influencing Factors and Scientific Judgment Criteria for GRC Component Demolding

The unique properties of GRC material (glass fiber reinforced concrete) determine the complexity of judging its demolding timing. Unlike ordinary concrete, the strength development of GRC components is affected by multiple factors such as glass fiber distribution, cement hydration degree, and ambient temperature and humidity. The demolding strength model established by Qinglong Group's laboratory based on 2,000+ sets of experimental data shows that the theoretically optimal demolding window is when the component surface hardness reaches Mohs hardness 3.5 and the curing age meets the minimum strength requirement (usually ≥7MPa). This standard ensures both the structural stability of components and maximizes mold turnover efficiency, and is especially suitable for the production of shaped GRC components for projects such as grand theaters and convention centers.

Dynamic Demolding Strategy under Environmental Variables: Coordinated Control of Temperature and Humidity

In actual production, fluctuations in environmental parameters require enterprises to have dynamic adjustment capabilities. Qinglong's Guangxi production base adopts an intelligent curing system that automatically adjusts steam supply and circulation air speed by monitoring temperature and humidity changes in the curing chamber in real time. When the ambient temperature is below 15°C, we appropriately extend the curing time by 1.5-2 times and use electrically heated mold technology; in hot and humid seasons (such as June-August in South China), formula adjustments such as reducing the water-cement ratio and increasing the amount of retarder are made to ensure that components reach demolding strength within 48 hours. This locally adapted process adjustment is the technical guarantee that enables Qinglong to achieve stable delivery for projects across China and even Southeast Asia.

Full-Chain Demolding Quality Control System

Scientific demolding management needs to be moved up to the design stage. When splitting GRC components, Qinglong's in-depth design team fully considers demolding feasibility, simulates component deadweight distribution through BIM technology, and optimizes demolding lifting point settings. The production process adopts the 'three-inspection system': strength testing must be performed before demolding the first piece, random sampling is conducted for every 20 pieces in mass production, and key components (such as decorative lines with cantilever length >1.5m) require stress monitoring before and after demolding. The installation stage uses 3D laser scanning to ensure that the precision of demolded components meets design requirements. This full-process quality control from design to installation has enabled Qinglong GRC products to achieve the industry-leading results of zero cracking and zero rework in projects such as the Dongguan Women and Children's Activity Center.

As an enterprise that participated in formulating the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC), Qinglong has always believed that controlling the demolding timing is not merely a technical issue of a single process step, but a touchstone that reflects an enterprise's full-chain service capability. From material formula development to intelligent curing systems, from BIM in-depth design to installation process innovation, the pursuit of excellence at every step has together forged the high quality of GRC components. In the future, Qinglong will continue with the mission of 'Creating Beautiful Architecture,' leveraging 28 years of accumulated professional experience to provide designers and owners with one-stop GRC solutions from in-depth design to after-sales maintenance, allowing more landmark buildings to showcase the beauty of materials.