Influence of waste glass powder on printability and mechanical properties of 3D printing geopolymer concrete
Zhaoliang Sheng, Binrong Zhu, Jingming Cai, Jinsheng Han, Yamei Zhang, Jinlong Pan
Abstract
Geopolymers represent a promising solution for reducing carbon emissions in 3D printing concrete (3DPC). This study explores the utilization of waste glass powder (WGP) as a novel precursor material to evaluate its influence on the printability and hardened mechanical properties of 3D printing geopolymer concrete based on slag and fly ash. Experimental results indicate that WGP content below 10% accelerates hydration and enhances buildability, whereas content exceeding 10% slows hydration but improves extrudability. Mechanical tests on cured specimens demonstrate a notable increase in compressive and flexural strength with increasing WGP content from 0% to 20%. Microstructural and chemical analyses of the 20% WGP variant reveal a denser morphology and an optimized Si/Al ratio. • Within the range of 0–20% content, WGP can adjust the geopolymer reaction rate without compromising strength, thereby optimizing printability. • Introducing 20% WGP refines the microstructure of geopolymer concrete, ensuring superior mechanical strength. • WGP shows promising potential in enhancing the sustainability of 3D printing geopolymer concrete.