Why Is It Difficult for UHPC's Elastic Modulus to Exceed 55GPa? Analysis of the Constraining Factors in Material Properties and Preparation Processes

In modern building curtain wall projects, GRC curtain walls have become the material of choice for many landmark buildings thanks to their lightweight, high-strength and flexible shaping characteristics. However, as the “outer garment” of a building, a curtain wall's wind pressure deformation performance directly affects building safety and service life. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group provides professional analysis for designers and owners from two aspects: testing methods and key points.

Standards and Methods for Testing the Wind Pressure Deformation Performance of GRC Curtain Walls

Testing of the wind pressure deformation performance of GRC curtain walls must strictly follow the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018). The test is usually conducted in a professional laboratory, where a static pressure chamber simulates different wind pressure levels and displacement gauges measure the maximum deformation of curtain wall specimens under positive and negative pressure. Qinglong Group's production base in Nanning, Guangxi is equipped with advanced mechanical performance testing equipment, enabling full-process quality control of GRC components from raw materials to finished products and ensuring the accuracy and authority of test data.

Three Key Points of Wind Pressure Deformation Testing

1. Specimen Design and Installation Simulation: The test specimen must fully reproduce the curtain wall structure of the actual project, including the connection method between the GRC panels and the supporting frame. Qinglong applies BIM technology for joint simulation at the detailed design stage, ensuring that the specimen's load-bearing state is consistent with the actual installation and avoiding distorted test results caused by differences in boundary conditions. For example, in a commercial complex project, precisely simulating the stiffness of bolted joints kept the deviation between test data and on-site wind pressure testing within 5%.

2. Graded Loading and Deformation Monitoring: The test requires step-by-step loading according to wind pressure levels, recording the deformation curve at each pressure level. Particular attention should be paid to the critical point between elastic and plastic deformation, which is directly related to the long-term weather resistance of GRC materials. Qinglong's GRC curtain wall panels have a flexural strength of over 20MPa and retain elastic recovery under 1.5 times the design wind pressure, far exceeding the industry average.

3. Sealing Performance and System Coordination: Wind pressure deformation involves not only the panels themselves but also the coordinated performance of sealing strips and the anchoring system. Qinglong adopts customized sealing solutions in production and uses 3D laser scanning technology to ensure installation accuracy, enabling the curtain wall system to maintain good water tightness and air tightness under cyclic wind pressure loads.

As a national high-tech enterprise and a participant in formulating GRC industry standards, Qinglong Group has always upheld the mission of “creating aesthetically pleasing buildings,” integrating 28 years of engineering experience into every aspect of GRC curtain walls. From material formulation optimization to construction process innovation, from laboratory testing to on-site operation and maintenance support, Qinglong provides customers with full life-cycle solutions. Whether for super high-rise landmarks or complex free-form buildings, choosing Qinglong GRC curtain walls means choosing the dual guarantee of safety and aesthetics. Going forward, Qinglong will continue to deepen its expertise in the field of UHPC/GRC/GRG/GRP materials, driving the high-quality development of the architectural decoration industry through technological innovation.