Research on Acoustic Performance Optimization Strategies and Key Technologies for Perforated GRC Panels

In the field of architectural acoustic design, optimizing the acoustic performance of materials has become a core topic for enhancing spatial experience. As a new type of building material that combines decorative and functional properties, perforated GRC panels are redefining the acoustic environment standards of modern architecture through in-depth exploration and technical innovation of their acoustic performance. Qinglong Group, an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, has developed systematic solutions for the acoustic optimization of perforated GRC panels through its full-chain technical accumulation.

### Technical Logic and Core Challenges of Acoustic Optimization for Perforated GRC Panels

The acoustic performance of perforated GRC panels derives from the synergy between material properties and structural design. GRC material itself has a porous structure; through precise control of the perforation rate, aperture distribution, and the thickness of the air layer behind the panel, efficient absorption and diffusion of sound waves can be achieved. However, practical applications face three core challenges: first, how to balance the relationship between decorative styling and acoustic parameters, especially in curved and irregularly shaped components; second, differentiated acoustic requirements across different scenarios, such as reverberation time control in theaters versus noise reduction requirements in commercial spaces; third, the long-term stability of material durability and acoustic performance, which requires technical breakthroughs in glass fiber ratio and cement-based material modification.

Backed by the technical strength of its provincial-level R&D center and drawing on data from over 100 acoustic experiments, Qinglong Group has established an acoustic performance database for perforated GRC panels. For example, in a grand theater project in Dongguan, a gradient aperture design with diameters of 3-8mm was adopted, combined with a 50mm air layer and a porous sound-absorbing cotton composite structure, achieving an average sound absorption coefficient of over 0.85 in the 125-4000Hz frequency band and meeting the national first-class acoustic standard.

### Full-Chain Technical System: The Acoustic Optimization Path from Design to Application

**1. Acoustics-Oriented Innovation in Material Formulation** As a National High-Tech Enterprise, Qinglong introduced nano-scale silica fume and basalt fiber composite modification technology into its GRC material formulation, increasing the porosity of the base material by 15% while maintaining flexural strength ≥18MPa. By adjusting the glass fiber content (typically controlled at 5-8%) and its distribution direction, the internal sound energy conversion efficiency of the material is optimized, laying the foundation for acoustic performance.

**2. Parametric Perforation Design and BIM Collaboration** Using the Rhino+Grasshopper parametric platform, Qinglong developed an acoustic performance simulation system for perforated GRC panels that can automatically generate perforation layout schemes according to spatial acoustic requirements. In an exhibition center project in Nanjing, by integrating acoustic simulation data through a BIM model, the perforation rate of a 3,000㎡ perforated GRC ceiling was optimized from traditional uniform distribution to zonal gradients (5%-25%), keeping sound field non-uniformity within ±2dB—far superior to industry standards.

**3. Engineering Implementation of Composite Construction Systems** Addressing the needs of different scenarios, Qinglong has innovatively developed composite construction systems such as "perforated GRC + air layer + sound-absorbing cotton" and "perforated GRC + resonance cavity". For example, in a commercial complex project in Shenzhen, a double-layer perforated GRC panel design was adopted (5mm aperture on the outer layer, 8mm on the inner layer), combined with 100mm-thick centrifugal glass wool, successfully reducing background noise from 60dB to 42dB while meeting the artistic styling requirements of the building facade.

### Industry Practice and Standards Leadership: From Project Validation to Technology Export

As a participating drafting unit of the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018), Qinglong Group has incorporated the acoustic optimization technology of perforated GRC panels into its corporate standard system and validated it through multiple benchmark projects. In the Guangxi Cultural and Art Center project, its custom-designed hyperbolic perforated GRC curtain wall not only achieved complex architectural aesthetics but also, through acoustic performance optimization, precisely controlled the concert hall reverberation time at 1.5±0.1s, winning the 2023 "China Building Acoustics Innovation Award".

Currently, Qinglong is extending the acoustic technology of perforated GRC panels to material fields such as UHPC and GRG, developing acoustic components suitable for special environments such as subways and airports. In the future, with the development of green buildings and smart construction, perforated GRC panels will play a greater role in areas such as acoustic energy conservation and healthy buildings, while Qinglong Group will continue to uphold its mission of "Creating Beautiful Architecture", driving functional innovation and industrial upgrading in building materials.