In a groundbreaking study, researchers have unveiled a novel approach to enhancing the performance of three-dimensional printed concrete (3DPC) by utilizing dopamine-modified recycled polyethylene terephthalate (PET) fibers. The study, led by Ke-Ke Yu from the State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering at Shenzhen University, addresses a persistent challenge in the construction industry: weak interlayer adhesion in 3DPC.
As the construction sector increasingly seeks sustainable solutions, 3DPC has emerged as a promising technology, allowing for greater design flexibility and a reduction in material waste. However, the layer-by-layer extrusion process often results in inadequate bonding between layers, which can compromise the structural integrity of printed components. Yu’s research suggests that modifying recycled PET fibers with dopamine can significantly improve this interlayer adhesion, ultimately enhancing the mechanical properties of the concrete.
“The dopamine treatment not only enhances the surface roughness of the fibers but also increases their hydrophilicity, allowing for better interaction with the concrete matrix,” Yu explained. This modification led to a remarkable 22.5% increase in interlayer adhesion strength when using 0.3 vol% modified fibers, compared to unmodified fibers. Additionally, the study found improvements in compressive and flexural strength, with increases of 22.5% and 27.6%, respectively.
The implications of this research are substantial for the construction industry. By integrating recycled materials into 3DPC, companies can reduce their environmental footprint while also improving the performance of their structures. The cost analysis presented in the study indicates that the modification process, estimated at around CNY 610 per kilogram of recycled PET fibers, could be offset by the enhanced performance and reduced material requirements in construction projects.
Moreover, the use of dopamine modification stands out as a cost-effective and environmentally friendly alternative to traditional surface treatment methods. Unlike plasma or silane treatments, which can be complex and expensive, dopamine modification is straightforward and requires minimal specialized equipment. This accessibility may encourage wider adoption of recycled PET fibers in 3DPC applications, potentially revolutionizing how construction materials are sourced and utilized.
As the construction industry grapples with sustainability challenges, Yu’s findings present a promising avenue for integrating recycled materials into modern building practices. “This research not only contributes to eco-friendly construction but also demonstrates the potential of recycling discarded plastics into valuable building materials,” Yu added.
Published in the journal ‘Materials’, this study underscores the transformative potential of innovative material modifications in construction. As the industry leans towards more sustainable practices, the integration of dopamine-modified recycled PET fibers could pave the way for a new era in 3DPC, merging environmental responsibility with structural excellence. For more information on this research, visit Shenzhen University.