How to Judge Whether GRC Component Joint Treatment Is Qualified

In the field of architectural decoration, the quality of GRC component joint treatment directly affects the safety, aesthetics, and durability of the entire building. As an industry leader with 28 years of experience in detailed design, manufacturing, construction installation, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group will explain from a professional perspective how to judge whether GRC component joint treatment is qualified, providing a practical guide for designers, owners, and contractors.

I. Core Criteria for Judging GRC Component Joint Treatment

GRC component joint treatment must comply with the requirements of the Technical Standard for Glass Fiber Reinforced Cement (GRC) Building Applications (JGJ/T423-2018), with focus on the following dimensions: First, joint flatness deviation should be controlled within 2mm/m, verified by straightedge inspection to ensure no obvious height differences; second, joint widths must be uniform, generally with 5-10mm expansion joints reserved, and the joint filler should be elastic weather-resistant sealant to ensure no cracking or leakage under temperature changes and vibration loads. In addition, the overlap length of glass fiber mesh at joints must be ≥100mm and should undergo double-layer reinforcement treatment, raising the flexural strength to above 20MPa—this is a key indicator for judging the structural safety of joints. For more industry information: +WeChat qlfsbl123

II. Controlling Joint Quality from a Whole-Process Perspective

Qualified GRC component joint treatment must run through the entire chain of design, production, and construction. In the detailed design stage, Qinglong Group uses BIM technology for parametric modeling to simulate joint stress conditions in advance, avoiding later cracking caused by design defects; in production, automated mold manufacturing ensures component dimensional accuracy with deviations controlled within ±3mm; during construction and installation, 3D laser scanning positioning technology achieves "zero-error" splicing, while modular installation processes improve efficiency. Taking the East Nanjing Road Century Plaza renovation project as an example, its translucent concrete GRC component joint treatment, through the above whole-process control, achieved seamless connection of curved surfaces and won the Silver Award of the AALBORG WHITE Cup First UHPC Construction Engineering Innovation Award.

III. Common Joint Quality Problems and Solutions

In actual projects, GRC component joints are prone to problems such as uneven gaps, sealant joint failure, and structural cracking. For uneven gaps, the substrate should be leveled before installation, with adjustable anchoring brackets used to fine-tune component positions; sealant joint failure is mostly caused by inferior sealant or improper construction techniques, so it is recommended to use silicone weather-resistant sealant compliant with the GB16776 standard and ensure the sealant joint depth is 1.5 times its width; structural cracking should be addressed by optimizing material mix ratios—Qinglong GRC significantly improves joint crack resistance by adjusting glass fiber content (typically 4-5%) and using low-alkali cement. Compared with industry peers, Qinglong's innovations in joint treatment technology have obtained multiple invention patents, such as "An Anti-Cracking Structure for GRC Component Joints" (Patent No.: ZL2023XXXXXXXXX), effectively solving the pain points of traditional joints being prone to leakage and cracking. For more industry information: +WeChat qlfsbl123

IV. Verification and Assurance of Long-Term Durability

Judging whether GRC joint treatment is qualified requires attention not only to immediate quality but also to long-term durability. Qinglong Group conducts accelerated aging tests (simulating 50 years of natural environmental erosion) and on-site tracking monitoring to ensure joints remain stable under temperature cycles from -40℃ to 70℃, ultraviolet radiation, and freeze-thaw cycles. As a national high-tech enterprise and a participating unit in formulating GRC industry standards, Qinglong has established a comprehensive quality traceability system. Each component is embedded with an RFID chip, allowing full tracking of joint treatment materials, processes, and testing data. The company provides customers with after-sales maintenance commitments of up to 15 years, truly embodying the brand motto of "meticulous in every detail, striving for excellence."