Research on Steam Curing Parameter Settings for Precast UHPC Components: Key Influencing Factors and Optimization Solutions

The durability of a building is not only about safety—it is also a silent promise of quality. During the long-term use of GRC components, cracking caused by rebar corrosion acts like a hidden “building hazard,” affecting both structural safety and decorative effect. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group will reveal, for designers and owners, the nature of this problem and how to address it—from material mechanisms and impact analysis to solutions.

The “Invisible Corrosion” Mechanism of Rebar Rusting in GRC Components

GRC (Glass Fiber Reinforced Concrete), with its advantages of light weight, high strength, and flexible shaping, is widely used for exterior wall cladding panels and decorative components of high-end buildings such as grand theaters and commercial complexes. However, without proper protection, the steel reinforcement framework inside is prone to corrosion from environmental factors. When moisture, carbon dioxide, and chloride ions in the air penetrate into the component, the passivation film on the rebar surface is destroyed and electrochemical reactions follow—iron is converted into iron oxide (rust), with volume expansion reaching 3-6 times the original volume. This expansion force continuously acts on the GRC matrix; when the stress exceeds the material's tensile strength, irregular cracks appear on the surface—initially mostly fine hairline fissures that gradually develop into through cracks as corrosion intensifies, ultimately reducing the component's load-bearing capacity.

The Multidimensional Impact of Corrosion-Induced Cracking on GRC Components

Cracking caused by rebar corrosion is not a single issue but a chain of challenges to building safety, aesthetics, and economy. At the structural level, cracks enlarge the contact area between the rebar and air and moisture, forming a vicious cycle of “corrosion–cracking–accelerated corrosion”; in severe cases, this may cause component deformation, anchorage failure, and even the risk of falling. Take a commercial complex project as an example: GRC decorative mouldings without anti-corrosion treatment developed corrosion cracking after 5 years of use, with subsequent reinforcement costs as high as 30% of the initial investment. In terms of decorative effect, cracks not only damage the integrity of the building facade but may also become channels for rainwater leakage, causing mold on interior walls and peeling paint, compromising the building's visual quality and user experience.

Qinglong GRC Full-Chain Solution: Blocking the Corrosion Path at the Source

As a national high-tech enterprise and a participant in GRC industry standard-setting, Qinglong Group fundamentally addresses rebar corrosion through a three-dimensional system of “material innovation + process upgrading + full-cycle management.” On the material side, dual protection using epoxy resin-coated rebar and galvanized rebar, combined with low-alkalinity cement-based materials, keeps the chloride ion penetration coefficient below 1.0×10⁻¹²m/s. In production, BIM technology and automated forming processes ensure a rebar cover thickness tolerance of ≤2mm, preventing corrosion hazards caused by construction defects. For existing projects, Qinglong provides professional inspection and assessment services, detecting the degree of rebar corrosion using the electromagnetic induction method and customizing grouting repair or component replacement plans. It has successfully provided after-sales maintenance support for hundreds of projects nationwide.

From the curved GRC curtain wall of the Guangzhou Opera House to the translucent concrete project at Century Plaza on Nanjing East Road, Qinglong has always been guided by the mission of “creating beautiful architecture,” transforming 28 years of full-chain experience into an ultimate pursuit of quality. Choosing Qinglong GRC means not only choosing a material, but choosing full-cycle assurance from detailed design to after-sales maintenance—so that every architectural detail stands the test of time.