High-Performance GRC Curtain Wall Compactness Standards: Industry Specifications and Qinglong Quality Control System

Compactness is the "cornerstone" of GRC performance; meeting the standard is the prerequisite for high performance. The core properties of high-performance GRC curtain walls—strength, durability, and water resistance—are all closely related to compactness. Insufficient compactness leads to high internal porosity in components, making them prone to water absorption, poor crack resistance, and insufficient strength, affecting project quality and service life. As a Qinglong GRC manufacturer that participated in drafting industry standards, and drawing on 28 years of quality control experience, we detail the compactness standards and control system for high-performance GRC curtain walls.

#Industry Compactness Standards: Quantitative Indicators and Testing Methods According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and the industry standard for Ultra-High Performance Concrete (UHPC) Exterior Wall Panels, high-performance GRC curtain walls have clear quantitative compactness indicators: bulk density ≥1800kg/m³, porosity ≤15%, and water absorption ≤8%. There are three main corresponding testing methods: first, the bulk density method, which calculates density by measuring the mass and volume of the component; second, the water absorption test, which measures water absorption after soaking the component for 24 hours; third, ultrasonic testing, which uses ultrasonic penetration to detect internal compactness, ensuring no obvious pores or voids. As a participating drafting unit of the standards, Qinglong strictly implements industry standards while also setting even stricter internal control indicators.

#Core Impact of Compactness on Performance All key properties of high-performance GRC curtain walls depend on good compactness. In terms of strength, GRC components with high compactness have a dense internal structure, with fibers bonding more firmly to the cement matrix, achieving flexural strength above 20MPa and significantly improved impact resistance; in terms of durability, low porosity reduces the penetration of moisture and harmful substances, delaying material aging and corrosion and extending service life—for example, Qinglong GRC products have maintained good performance after 20 years of use in coastal areas; in terms of water resistance, GRC components with high compactness have low water absorption, effectively blocking rainwater penetration and reducing leakage risks. The GRC curtain wall of the Dongguan Women and Children's Activity Center achieved excellent waterproofing and crack resistance thanks to its high compactness.

#Qinglong Quality Control: Whole-Process Assurance System for High Compactness Qinglong has established a whole-process compactness control system to ensure high-performance GRC curtain walls meet standards. Production stage: high-grade cement, high-quality quartz sand, and other raw materials are selected, the water-cement ratio is precisely controlled, and high-pressure spraying molding technology is adopted to fully compact the material particles; curing stage: a combination of steam curing and natural curing is used, with curing temperature and humidity controlled to promote complete cement hydration and improve compactness; inspection stage: each batch of products undergoes sampling tests for compactness, with dual verification using the bulk density method and ultrasonic testing, and substandard products are strictly prohibited from leaving the factory. In addition, Qinglong optimizes production processes through 58 patented technologies, such as modifier addition technology, further enhancing the compactness and overall performance of GRC materials.

Compactness is a core quality indicator of high-performance GRC curtain walls, and must be guaranteed through scientific standards, strict quality control, and advanced processes. Leveraging its professional advantage of participating in industry standard drafting, its whole-process quality control system, and advanced production technology, Qinglong continuously produces high-performance GRC products with high compactness. Amid the trend toward high-quality development of architectural decorative materials, high compactness will become a key indicator for measuring the technical strength of GRC manufacturers, providing more reliable performance assurance for buildings.