Analysis of the Impact of the Thermal Expansion Coefficient of Exterior Wall GRC on Construction and Countermeasures

Thermal expansion and contraction are an invisible test for building materials; only by scientifically addressing GRC's thermal expansion challenges can we create century-lasting projects with peace of mind.

In the field of modern architectural decoration, Glass Fiber Reinforced Concrete (GRC), with its advantages of light weight, high strength, and rich styling, has become the preferred material for exterior wall decoration in high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, the thermal expansion characteristics of GRC material are like a double-edged sword—they give the material the flexibility to adapt to ambient temperature changes, while also posing stringent challenges to construction precision and engineering quality. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group leverages its full-chain technical accumulation to thoroughly analyze the mechanism by which the coefficient of thermal expansion affects construction, and has developed a systematic response plan, providing designers and owners with expert-level support from detailed design to after-sales maintenance.

I. GRC Coefficient of Thermal Expansion: A Key Parameter Affecting Construction Quality

GRC material is a composite of cement-based cementitious materials, glass fibers, and aggregates, with a coefficient of thermal expansion typically ranging from 10×10⁻⁶/℃ to 15×10⁻⁶/℃, making it significantly affected by temperature changes. If this characteristic is ignored during construction, three core problems are likely to arise: first, cracking of components after installation due to thermal stress, especially in areas with large day-night temperature differences or seasonal transitions; second, deformation and misalignment at joints, affecting the integrity and aesthetics of the building facade; third, long-term thermal expansion and contraction cycles accelerate fatigue of the anchoring system, creating hidden safety hazards. Take a commercial complex project as an example: GRC exterior wall panels without precise temperature control measures showed local bulging during summer high temperatures, and rework and adjustment had to be carried out later, which both increased costs and delayed the schedule.

II. Full-Chain Response Strategy: A Technical Closed Loop from Design to Installation

Based on 28 years of engineering experience, Qinglong Group has built a trinity thermal expansion response system of "design optimization - production control - construction adaptation." In the detailed design stage, BIM technology is used to simulate component deformation under different temperature fields; reasonable expansion joints (usually 5-10mm) are reserved through parametric modeling and filled with elastic sealant to ensure space for thermal deformation. In the manufacturing stage, the water-cement ratio and curing temperature are strictly controlled to ensure that GRC components achieve stable physical properties before leaving the factory; meanwhile, a "zoned production, batch testing" mechanism guarantees that the deviation of the coefficient of thermal expansion within the same batch is ≤10%. During construction and installation, the innovative "3D laser scanning + modular hoisting" process is adopted, combined with adjustable stainless steel anchors, achieving installation error of ≤2mm and effectively offsetting cumulative deviations caused by thermal deformation.

III. Validation by Industry Practice: Temperature Adaptability Performance of Qinglong GRC Projects

As a participating unit in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has integrated thermal expansion control technology into hundreds of benchmark projects. In a landmark building in a subtropical region, its GRC exterior wall system, through "thermal bridge break design + elastic connection joints," successfully coped with extreme environments with an annual temperature difference of up to 40℃, and no cracking or leakage problems appeared after 5 years of use. In addition, for overseas projects such as a commercial center in Malaysia, the Qinglong team customized low-shrinkage formula GRC materials suited to the local hot and humid climate, with the coefficient of thermal expansion stably controlled below 12×10⁻⁶/℃, earning high recognition from the owner and the general contractor.

[Summary] The coefficient of thermal expansion of GRC materials is not a construction challenge, but a touchstone for measuring a supplier's technical strength. With the R&D strength of a national-level high-tech enterprise, Qinglong Group transforms material characteristics into engineering advantages; through full-chain technical control and innovative processes, GRC exterior walls meet both architectural aesthetic requirements and long-term structural safety. In the future, Qinglong will continue to uphold the values of "honesty, striving, trust, and collaboration," drive application breakthroughs of UHPC/GRC/GRG/GRP materials in more complex environments, and continuously empower the mission of "creating beautiful architecture."