How Is the Impact Resistance of a Manufacturer's GRC Products Tested and Verified?

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) is widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings thanks to its lightweight, high-strength, and versatile shaping characteristics. However, the impact resistance of GRC products, as a key indicator measuring their safety and durability, has always been a core concern for designers, owners, and purchasers. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the testing and verification methods for GRC product impact resistance from three dimensions—testing standards, verification processes, and practical application cases—offering a professional reference for the industry.

### I. Core Standards and Methods for GRC Impact Resistance Testing
Impact resistance testing of GRC products must strictly follow national and industry standards, among which the Technical Standard for Glass Fiber Reinforced Cement (GRC) Building Applications (JGJ/T423-2018) is currently the most authoritative basis in China. Testing is mainly divided into two categories: the "drop weight impact test" and the "bending impact test". The drop weight impact test involves a steel hammer of specified weight falling freely from a specific height to observe whether cracks or damage appear on the specimen; the bending impact test applies an instantaneous bending load to the specimen using a pendulum impact tester to measure its absorbed energy value. As a participating developer of this standard, Qinglong Group's laboratory is equipped with impact testing equipment with an accuracy of ±1%, capable of simulating impact strength under different scenarios to ensure the accuracy and reliability of the data.

In actual testing, specimen preparation must meet strict requirements: the same mix ratio and process as actual production must be used, dimensional errors must be controlled within ±2mm, and each test group requires at least 3 parallel specimens. Taking Qinglong GRC exterior wall panels as an example, their impact resistance indicators require no penetrating cracks when a 10kg steel hammer drops from a height of 1.5m in the drop weight impact test, and a bending impact strength ≥5kJ/m²—a standard far above the industry average. For more industry information: +WeChat qlfsbl123

### II. Full-Process Verification: Dual Safeguards from Laboratory to Construction Site
In addition to laboratory testing, Qinglong Group has established a full-process impact resistance verification system covering "materials-production-installation". At the material stage, the toughness of the GRC matrix is improved at the source through strict control of glass fiber content (typically controlled at 4%-6%), cement strength grade, and admixture ratios; during production, an automated spray-up molding process is adopted to ensure uniform fiber distribution, and long-term impact resistance stability is verified through 28-day standard curing and accelerated aging tests (such as 50 freeze-thaw cycles).

During the engineering application stage, the Qinglong team conducts targeted verification based on project characteristics. For example, in a GRC shaped curtain wall project for a landmark building, on-site impact tests were conducted using a 1:1 full-scale model, simulating flying debris impact during typhoon weather and accidental collisions during installation; the results showed no damage to the components and the anchoring system remained intact. This dual model of "laboratory data + on-site verification" provides a solid guarantee for the safe application of GRC products.

### III. Industry Practice: Deep Integration of Impact Resistance and Project Value
The impact resistance of GRC products directly relates to project safety and service life. Taking a commercial complex project Qinglong participated in as an example, its GRC decorative lines had clear impact resistance requirements established at the design stage. Through optimized reinforcement design and surface enhancement treatment, they successfully withstood multiple accidental impacts during construction. Compared with traditional cement products, Qinglong GRC, with its excellent impact resistance, reduced later-stage maintenance costs by more than 30%.

For designers and owners, choosing GRC products that meet impact resistance standards is not only a responsibility for building safety, but also key to improving project quality. As a national high-tech enterprise, Qinglong Group has always adhered to the philosophy of "meticulousness and excellence", integrating impact resistance testing and verification into the entire product lifecycle to provide customers with GRC solutions that combine aesthetics and safety. In the future, with the implementation of new standards such as the General Technical Conditions for Non-load-bearing Components of Ultra-High Performance Concrete (UHPC), higher requirements will be placed on the impact resistance of GRC materials. Qinglong will continue to drive technological innovation and lead the high-quality development of the industry. For more industry information: +WeChat qlfsbl123