How Large Is the Unit Price Difference Between UHPC Panels and GRC Cladding Panels and Analysis of Influencing Factors

In the field of modern architectural decoration, GRC panels are widely used in various high-end buildings thanks to their lightweight, high-strength, and versatile formability. However, the sealing of joints between GRC panels and metal components, a critical factor affecting overall project quality, often suffers from leakage, detachment, and other issues due to improper detail handling. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on the practice of hundreds of landmark projects to develop a systematic sealing solution, providing professional technical reference for designers and owners.

Risk Analysis of Sealing Failure at GRC Panel-to-Metal Component Connections

The joints between GRC panels and metal frames are weak points in building curtain wall systems, and their sealing must address both material property differences and external environmental challenges. GRC is a brittle composite material with a thermal expansion coefficient of approximately 10×10⁻⁶/℃, while metal components (such as aluminum alloy profiles) have a thermal expansion coefficient of up to 23×10⁻⁶/℃, making temperature changes prone to causing interfacial stress concentration. In addition, natural factors such as rainwater penetration, UV exposure, and wet-dry cycles accelerate the aging of sealing materials, leading to hidden dangers such as joint leakage and component corrosion. A commercial complex project once experienced water leakage at the connection between GRC panels and steel furring due to improper sealant selection three years after commissioning, causing interior decoration damage and rework costs of up to one million yuan.

Material Selection and Process Essentials for Scientific Sealing Treatment

Qinglong Group establishes 3D parametric models at the detailed design stage and simulates the load conditions of joints through BIM technology to achieve precise sealing design. For material selection, priority is given to neutral silicone sealants complying with the GB16776 standard "Silicone Structural Sealant for Building," featuring elongation ≥300% and modulus ≤0.4MPa, which can effectively absorb interfacial movement. Before construction, metal components must be sandblasted to remove rust, achieving a surface roughness of Sa2.5 grade, and coated with epoxy zinc-rich primer to ensure a bond strength between sealant and substrate of ≥0.6MPa.

The joint structure adopts a "double sealing + cavity pressure relief" design: the first seal is structural adhesive with a width of no less than 7mm and a depth-to-width ratio controlled at 1:1.5; the second seal uses weather-resistant adhesive combined with foam rods to form an elastic buffer layer. For curved GRC panels, prefabricated special-shaped sealing strips are innovatively adopted, with factory compression molding ensuring the fit of sealing surfaces and improving on-site installation efficiency by 40%. After a grand theater project applied this process, it withstood a force-12 typhoon with a zero joint leakage rate.

Construction Quality Control and Full-Cycle Assurance System

As a national high-tech enterprise, Qinglong has established full-process quality control standards from detailed design to after-sales maintenance. The construction phase implements the "three-inspection system": the first sample must pass tensile-compression cycle testing (±50% of design displacement, 500 cycles without damage); 3 joints are randomly selected per 500㎡ for on-site peel tests; before completion, overall sealing performance is tested using infrared thermal imaging technology. For overseas projects, Qinglong Malaysia Building Materials Co., Ltd. has specially developed a salt-alkali resistant sealing system, fulfilling a 15-year maintenance-free commitment in a coastal project in Singapore.

It is worth noting that sealing treatment is not a one-time solution. Qinglong's after-sales maintenance service includes regular joint inspections (once per quarter in the first year, then once a year thereafter), evaluating sealant aging through specialized testing equipment and carrying out preventive maintenance in a timely manner. This "full life-cycle management" concept has enabled a landmark project in Guangzhou undertaken by Qinglong to maintain a 98% integrity rate in its sealing system eight years after delivery.

The sealing of GRC panels and metal components is a comprehensive embodiment of materials science, structural mechanics, and construction technology. With 28 years of technical expertise, Qinglong Group has elevated sealing joints from simple waterproofing structures to systematic engineering, providing lasting assurance for building safety and aesthetics through four-dimensional control of "design-materials-construction-maintenance." In the future, with the widespread application of UHPC/GRC composite components, Qinglong will continue to innovate sealing technology, driving the industry toward a greener and more durable direction.