What UHPC Manufacturers Are Nearby and How to Choose a Quality UHPC Supplier

In the world of GRC materials, sand, though small, is the cornerstone that determines quality. Choosing the wrong sand may plant hidden risks in even the tallest buildings; choosing the right sand ensures that every GRC component combines strength with beauty, safeguarding the building for a hundred years.

In the field of architectural decoration, GRC (glass fiber reinforced concrete) has become the favorite of high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its advantages of light weight, high strength, and rich styling. However, to create high-quality GRC products, material selection is key—especially the choice of sand. Why is sea sand strictly prohibited in GRC? What are the standards for qualified silica sand? 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 will provide you with an in-depth analysis of the selection requirements and specifications for GRC sand.

I. The Core Reason Sea Sand Is Prohibited in GRC: Avoiding Quality Risks at the Source

Sea sand, sourced from the marine environment, contains large amounts of chloride ions and salts, which are an "invisible killer" for GRC materials. Chloride ions can penetrate into the GRC, corroding the glass fibers and steel reinforcement, causing components to lose strength, crack, or even fall off, severely affecting building safety and service life. In addition, impurities such as shells in sea sand reduce the compactness of the concrete and impair GRC durability. Qinglong Group has always insisted on prohibiting sea sand in production and controlling material quality at the source, ensuring that every batch of GRC products complies with national and industry standards—this is also a solemn commitment to project safety as a national high-tech enterprise.

II. Standards for Qualified Silica Sand: Three Dimensions That Lay the Foundation of GRC Quality

Qualified silica sand is the guarantee of GRC material performance, and its standards are mainly reflected in the following three aspects:

1. Chemical composition: The silicon dioxide content must reach over 90%, and the content of impurities (such as clay, mica, and sulfides) must be controlled within strict limits. High-purity silica sand reduces erosion of glass fibers and improves the chemical stability of GRC. Qinglong Group has established a comprehensive raw material testing system to precisely analyze the chemical composition of silica sand, ensuring compliance with the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018).

2. Particle gradation: The particle size and distribution of silica sand must be reasonable to ensure the workability and compactness of the concrete. Generally, the fineness modulus of the sand should be between 2.3 and 3.0, with continuous particle gradation, avoiding excessive fine or coarse sand. The Qinglong production base uses advanced screening equipment to grade silica sand, ensuring that its gradation meets GRC production requirements and providing a guarantee for the strength and surface quality of components.

3. Physical properties: Silica sand should have good cleanliness, with mud content below 1% and moisture content controlled within a reasonable range. Clean silica sand reduces voids inside the concrete and improves the impermeability and durability of GRC. Qinglong Group conducts strict physical property testing on every batch of silica sand to ensure it meets production requirements—this is also the confidence behind the company's repeated participation in formulating national and industry standards.

III. Qinglong's GRC Sand Selection Practice: 28 Years of Experience Forging a Quality Benchmark

As one of the larger comprehensive building material manufacturers in China, Qinglong Group has accumulated rich experience in GRC sand selection. The company has not only established a strict supplier screening mechanism and selected high-quality silica sand sources, but also exercises comprehensive control over all sand indicators through advanced testing equipment and technical means. From sand selection recommendations at the detailed design stage, to real-time quality monitoring during manufacturing, and then to follow-up feedback after construction and installation, Qinglong Group has achieved full-chain quality control of GRC sand. It is precisely this ultimate pursuit of detail that has enabled Qinglong GRC products to be successfully applied in many major projects across the country and overseas, in fields such as real estate, municipal metro, and airports, winning high recognition from clients.

Sand selection is the first step in GRC production and also the critical step that determines product quality. Qinglong Group always upholds the principle of "meticulous care and striving for excellence," providing customers with high-quality GRC material solutions through professional technology, strict standards, and rich experience. In the future, Qinglong will continue to focus on the innovative development of UHPC/GRC/GRG/GRP materials, committed to becoming an outstanding world-leading manufacturing enterprise and contributing to the creation of beautiful architecture.