In a groundbreaking study published in the journal *Buildings* (translated to English as “Buildings”), researchers have uncovered a promising approach to enhancing the sustainability and performance of self-compacting mortars (SCMs) used in construction. The research, led by Osman Hansu from the Department of Civil Engineering at Gaziantep Islamic Science and Technology University in Turkey, explores the integration of finely ground mortar waste powder (MWP) and reactive oxides into cementitious systems, offering a viable strategy for reducing environmental impact without compromising structural integrity.
The study, which involved designing eleven different mortar mixes with varying levels of MWP replacement (ranging from 0% to 50% by volume), revealed that the incorporation of aluminum oxide (Al₂O₃) and iron oxide (Fe₂O₃) significantly improved the mechanical and durability performance of the SCMs. Notably, the mix labeled SCM2, which contained 5% MWP along with the oxides, achieved impressive compressive and flexural strengths of 75.62 MPa and 13.74 MPa, respectively, at 28 days—outperforming the control mix.
“Our findings demonstrate that low-level MWP replacement, when reinforced with reactive oxides, can produce durable, high-performance, and eco-efficient SCMs,” said Osman Hansu, the lead author of the study. “This approach not only reduces the environmental footprint of construction materials but also enhances their structural capabilities, making it a win-win for both sustainability and performance.”
The research also highlighted the superior strength retention of oxide-reinforced mixes under extreme conditions, such as high temperatures and freeze-thaw cycling. For instance, SCM2 maintained over 87 MPa after exposure to 300°C and showed minimal degradation after 100 freeze-thaw cycles. Additionally, the study found that porosity remained low at optimal replacement levels but increased significantly beyond 25% MWP, underscoring the importance of careful material proportioning.
The implications of this research for the construction and energy sectors are substantial. By providing a sustainable alternative to traditional cementitious materials, the study offers a pathway to reducing the environmental impact of construction while maintaining high performance standards. This could lead to more eco-friendly building practices and contribute to the broader goals of reducing carbon emissions and promoting sustainable development.
As the construction industry continues to seek innovative solutions to balance performance and sustainability, the findings of this study could shape future developments in the field. By integrating recycled materials and reactive oxides, engineers and architects can create structures that are not only durable and high-performing but also environmentally responsible.
“This research opens up new possibilities for the construction industry,” Hansu added. “It shows that with the right combination of materials and techniques, we can achieve both sustainability and performance, paving the way for a more eco-friendly future in construction.”
The study, published in *Buildings*, serves as a testament to the potential of innovative materials and techniques in transforming the construction landscape. As the industry continues to evolve, the insights gained from this research could inspire further advancements, driving the development of more sustainable and resilient building materials.