Abstract:

With the increasing severity of environmental noise pollution, concrete noise barriers have been widely used in noise control due to their durability and cost-effectiveness. However, conventional concrete barriers have limitations in sound absorption and insulation, making it difficult to simultaneously achieve lightweight, multifunctional, and sustainable performance. Recent studies have incorporated foaming agents and porous lightweight aggregates into cement-based systems, which improves pore structures and sound energy dissipation, thereby enhancing the noise reduction capacity of concrete at the material level. 3D printing has offered new opportunities for constructing noise barriers by enabling complex geometries, lightweight structures, and structural customization, which promote sound scattering and energy dissipation, further improving both sound absorption and insulation performance. This article summarizes the key factors and regulation strategies influencing the acoustic performance of concrete, analyzes the role of 3D printing in tailoring pore architecture, interfacial bonding, and surface textures, and reviews representative engineering applications. The analysis indicates that 3D-printed noise-reducing concrete shows considerable potential for roadway noise barriers and building acoustics, although challenges remain in material printability, interlayer bonding, and pore structure stability. Future research should focus on the application of low-carbon and sustainable materials, multi-scale structural design, and durability assessment to enable the high-performance and practical applications of 3D-printed noise-reducing concrete.

Key words: ">concrete noise barrier">,  , ">3D printed concrete">,  , ">sound absorption">,  , ">sound insulation