What Are the Characteristics of the Material Mix Ratio for Lightweight GRC Mouldings? Lightweight High-Strength Formula Analysis

The core material mix characteristics of lightweight GRC shapes are "low bulk density, high fiber content, optimized aggregate gradation, and admixture synergy," ensuring a bulk density ≤1800kg/m³ while achieving flexural strength ≥15MPa. The lightweight GRC shapes of projects such as Qinglong Sanya Yingbin Yihao and Guangzhou Zengcheng Qiangwei Garden combine lightness with stability.

1. Core Material Mix Characteristics

Four features achieve lightness and high strength. Low bulk density base material: low-alkali sulphoaluminate cement (bulk density ≤1200kg/m³) is selected to replace part of the ordinary cement, reducing Qinglong's cement usage by 15% compared with conventional GRC; high fiber reinforcement: alkali-resistant glass fiber content ≥4%, combined with 0.1-0.2% polypropylene fiber, forms a three-dimensional reinforcement network, with Qinglong's fiber distribution uniformity reaching 98%, improving strength while lowering bulk density; optimized aggregate gradation: fine aggregate (quartz sand particle size 0.15-0.3mm) is used to reduce aggregate packing voids, with Qinglong's aggregate packing density increased by 10% and bulk density reduced by 15%; admixture synergy: 5-8% silica fume plus high-range water reducer is added to lower the water-binder ratio (≤0.35), with Qinglong's admixtures reducing GRC porosity by 20% and further lowering the bulk density.

2. Mix Parameters and Performance Assurance

Precise parameters balance lightness and performance. Typical mix (by weight): 30% low-alkali cement, 45% fine quartz sand, 4% alkali-resistant glass fiber, 6% silica fume, 0.8% high-range water reducer, and 14.2% water; this Qinglong mix has a bulk density of 1750kg/m³ and a flexural strength of 16MPa; performance control: compressive strength ≥40MPa and impact strength ≥5kJ/m², with Qinglong's lightweight GRC performance all exceeding code requirements; durability assurance: ≥300 freeze-thaw cycles with ≥90% strength retention, and the weather resistance of Qinglong's lightweight GRC is consistent with conventional GRC; process compatibility: the mix suits high-pressure vibration plus vacuum degassing processes, and Qinglong's process achieves lightweight GRC density ≥2.0g/cm³, preventing excessive porosity from compromising strength.

3. Qinglong Project Practice and Application Advantages

Real-world cases verify the mix effectiveness. Sanya Yingbin Yihao: lightweight GRC openwork decorative panels with a bulk density of 1700kg/m³, 20% lighter than conventional GRC, and installation efficiency improved by 30%; Guangzhou Zengcheng Qiangwei Garden: white lightweight GRC cladding panels with a bulk density of 1780kg/m³ and flexural strength of 15.5MPa, with no deformation after 6 years of use; technical advantages: 5 patents related to lightweight GRC mix design and participation in formulating the "Technical Requirements for Lightweight GRC"; customized services: mix parameters are adjusted according to shape complexity and load-bearing requirements, and Qinglong's lightweight GRC bulk density can be customized between 1600-1800kg/m³; application scenarios: high-rise building exterior walls, suspended shapes, and existing building renovation, with Qinglong's lightweight GRC suited to a wide range of scenarios, meeting lightweight requirements.