How to Judge Whether GRC Component Joint Treatment Is Qualified

In the field of architectural decoration, the quality of joint treatment for GRC components directly affects the safety, aesthetics, and durability of the overall project. As an industry leader with 28 years of experience in detailed design, manufacturing, construction and installation, and after-sales maintenance of UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the central role of joint treatment in GRC component applications. This article will analyze the qualification standards for GRC component joint treatment from a professional perspective, providing designers, owners, and contractors with practical criteria for judgment.

The qualification of GRC component joint treatment must be comprehensively evaluated from four dimensions: design, materials, workmanship, and acceptance. First, whether the joint scheme at the design stage is scientific and reasonable forms the foundation. High-quality GRC joint design should fully consider the load conditions of components, thermal deformation, and installation tolerances. Common rabbet joints and mortise-tenon joints must comply with the requirements of the Technical Standard for Architectural Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) to ensure uniform load transfer. In detailed design, Qinglong often uses BIM technology to simulate the stress state of joints, avoiding potential risks in advance—this also reflects its technical advantage as a national-level high-tech enterprise.

Material selection plays a decisive role in joint quality. Qualified GRC joint treatment requires the use of specialized repair materials matched to the component body, such as Qinglong's independently developed high-elasticity GRC repair mortar, whose flexural strength can reach over 20MPa and whose bonding strength with the substrate is ≥1.5MPa, effectively preventing joint cracking. In addition, sealant selection must balance weather resistance and elasticity, maintaining stable performance in environments from -40°C to 80°C to ensure joints are waterproof and leak-proof. For more industry information: +WeChat qlfsbl123

Construction workmanship is the key guarantee for qualified joint treatment. Qinglong strictly implements the "three-step method" during construction: the first step is substrate treatment, using mechanical grinding to remove loose dust and expose a fresh surface; the second step is layered repair, with each layer no thicker than 5mm to ensure full curing; the third step is surface finishing, using specialized tools to achieve a seamless transition with the component surface. For components with complex shapes, Qinglong also applies 3D laser scanning technology for precise positioning, achieving "zero-error" splicing—a workmanship verified in projects such as the East Nanjing Road Century Plaza renovation project.

Acceptance standards are the final basis for judging whether joint treatment is qualified. In addition to basic requirements such as a flat appearance, no cracks, and no obvious color difference, performance testing is also required: for example, the joint flexural test load should reach 1.5 times the design value, and the watertightness test should show no leakage for 30 minutes. Qinglong has established a comprehensive quality traceability system, recording the entire joint treatment process through RFID chips to ensure that every joint is traceable and verifiable. As the vice-chairman unit of the China GRC Association, the multiple industry standards Qinglong has participated in formulating provide an authoritative basis for joint treatment acceptance.

It is worth noting that the qualification of GRC component joint treatment not only affects current project quality but also impacts the long-term durability of buildings. In after-sales maintenance, Qinglong has found that about 30% of GRC component problems stem from improper joint treatment. Therefore, it has established a regular inspection system to promptly maintain issues such as sealant aging and cracking at joints. This full-chain service capability embodies Qinglong's practice of its mission of "creating beautiful architecture" and is also an important reason it has become a strategic partner of renowned real estate groups such as Vanke and Poly.