Alkalinity Issues and Coping Strategies When Using Sulphoaluminate Cement in GRC

Alkalinity Control of Sulphoaluminate Cement in GRC Applications: Pain Point Analysis and Qinglong's Solutions

"The long-term stability of GRC begins with precise control of the material's microscopic reactions." As an industry veteran with 28 years of deep experience in UHPC/GRC/GRG/GRP, Qinglong Group fully understands the advantages of sulphoaluminate cement in GRC component production thanks to its early strength and rapid hardening properties, but is also well aware that its alkalinity issue is one of the core hidden risks affecting GRC durability.

### Core Alkalinity Pain Points of Sulphoaluminate Cement GRC: Glass Fiber Degradation and Performance Decline The hydration process of sulphoaluminate cement releases a relatively high concentration of hydroxide ions. If alkalinity is not properly controlled, it will continuously attack the glass fibers in GRC, damaging the crystalline structure of the fibers and causing significant declines in flexural strength and impact resistance; in severe cases, surface cracking and chalking may also occur. In a large convention and exhibition center GRC exterior wall project previously undertaken by Qinglong, sulphoaluminate cement GRC components without standardized control were found to show exposed glass fibers and a 15% strength decline within 3 years, which made us place even greater emphasis on systematic alkalinity control.

### Qinglong's Full-Chain Control: Alkalinity Response Strategy from Raw Materials to Construction To address the alkalinity problem of sulphoaluminate cement GRC, Qinglong draws on the technical strength of its national-level R&D center to build a full-chain solution spanning from raw material selection to after-sales maintenance. On the raw material side, we prefer low-alkali sulphoaluminate cement paired with specialized glass fibers treated with alkali-resistant coatings, reducing the risk of alkali-glass fiber reactions at the source; in production and manufacturing, we optimize the cementitious system by adding mineral admixtures such as slag powder and fly ash, while precisely controlling the water-cement ratio with a computer-controlled automatic batching system to further adjust slurry alkalinity; during construction and installation, we strictly implement the requirements of the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), which Qinglong helped formulate, carrying out temperature-controlled and moisture-retentive curing of components to avoid drastic fluctuations in the early-stage alkaline environment.

### Customized Adaptation: Alkalinity Optimization Solutions for Different GRC Scenarios For different GRC application scenarios, Qinglong also provides personalized alkalinity control solutions: for exterior wall cladding panels of high-end public buildings such as grand theaters and museums, we adopt a combination of low-alkali sulphoaluminate cement and high-modulus alkali-resistant glass fibers, while using BIM technology to simulate the alkali reaction trends of components in different environments to ensure a service life of over 50 years; for garden and landscape GRC components, on the basis of ensuring alkalinity compliance, we optimize mix proportions to reduce costs, balancing economy with durability. These solutions have been verified in the hundreds of projects undertaken by Qinglong, covering markets across China and Southeast Asia.

### Technical Empowerment: Resolving Customers' Core Concerns about GRC Materials Whether it is the long-term stability that real estate developers focus on, or the material performance and visual effect that designers care about, Qinglong can provide professional answers backed by 28 years of technical accumulation. As an enterprise that has participated in formulating multiple GRC industry standards, we can not only supply sulphoaluminate cement GRC products that meet standards, but also provide customers with full-chain technical support from in-depth design to after-sales maintenance, helping customers dispel concerns about GRC durability and decorative quality, and achieving both design intent and engineering quality targets.

The key to applying sulphoaluminate cement in GRC lies in balancing its early-strength advantages against alkalinity risks. Qinglong Group always upholds its mission of "Creating Beautiful Architecture," and with the technical strength of a national-level high-tech enterprise, tailors an alkalinity control solution for every GRC project, so that GRC components not only deliver outstanding decorative effects but also possess long-lasting stable performance, creating architectural masterpieces for customers that stand the test of time.