In a significant advancement toward sustainable construction practices, researchers from the Technical University of Cluj-Napoca have unveiled promising findings on the use of recycled plaster waste in cement lime-based mortars. Led by Saitis Catalin, the study published in ‘Materials’ explores the potential of repurposing old plaster waste, particularly from deteriorated facades, as a substitute for traditional aggregates and cement. This innovative approach not only addresses the pressing issue of construction waste but also aligns with the European Union’s regulations promoting integrated waste management systems.
Catalin emphasizes the importance of this research, stating, “The reuse of old plaster waste presents a unique opportunity to reduce landfill waste while providing a sustainable alternative for construction materials.” As the construction industry grapples with its significant contribution to global waste and carbon emissions—accounting for around 40%—the findings from this study offer a pathway for more environmentally conscious building practices.
The research examined three mortar mixes: a control mix, a mix with 45% waste replacing aggregates, and another with 10% waste replacing cement. While the results indicated a reduction in mechanical properties—30% less flexural strength and 27% less compressive strength when aggregates were replaced with plaster waste—these values remained within acceptable limits for structural integrity. Notably, the 10% cement replacement actually enhanced flexural strength by 6%. This balance of performance and sustainability is crucial for the construction sector, which is increasingly pressured to adopt greener practices.
The team conducted a thorough microscopic analysis, revealing that the incomplete integration of portlandite particles from the plaster waste contributed to non-uniform bonding and crystal formation, which weakened the mortar’s structure. Catalin remarked, “Understanding the microscopic interactions within these materials allows us to fine-tune their performance, making them viable for real-world applications.”
This research not only fills a critical knowledge gap regarding the reuse of plaster mortars but also promotes a circular economy in construction. By effectively utilizing waste materials, the industry can significantly reduce its reliance on virgin resources, leading to lower carbon emissions and energy consumption. The findings suggest that up to 10-15% of waste can be incorporated into mortars without compromising performance, paving the way for more sustainable building practices.
As the construction sector continues to evolve, this study highlights the potential for recycled materials to play a pivotal role in future developments. With the construction industry under increasing scrutiny to minimize its environmental footprint, the insights from Catalin and his team could inspire further research and innovation in sustainable building materials.
For more information about this groundbreaking research, visit the Faculty of Civil Engineering, Technical University of Cluj-Napoca.