In the quest to tackle the mounting plastic waste crisis, researchers have uncovered a promising avenue for recycling polyvinyl chloride (PVC) drainage pipe waste into an innovative construction material that could significantly boost energy efficiency in buildings. A recent study led by Kaoutar Mouzoun from Mohammed V University’s Mohammadia School of Engineering in Rabat, Morocco, explores the potential of incorporating PVC waste into mortar, striking a delicate balance between enhanced thermal properties and mechanical strength.
The study, published in the journal *Sustainable Structures* (translated to English as “Sustainable Structures”), addresses a critical gap in existing research by investigating the use of PVC waste as a partial substitute for sand in mortar. “While previous studies have shown that adding plastic waste to construction materials can improve thermal properties, it often leads to a reduction in mechanical strength,” Mouzoun explains. “Our research carefully considers the size of PVC aggregates to mitigate this issue.”
The team evaluated seven substitution rates, ranging from 0% to 30% by weight, through a series of laboratory tests. These tests assessed bulk density, water absorption, compressive and flexural strength, thermal conductivity, volumetric heat capacity, and thermal diffusivity. The findings revealed that increasing the PVC content improved the mortar’s thermal properties, with an optimal substitution rate also enhancing mechanical characteristics.
One of the most compelling aspects of the study is its potential commercial impact on the energy sector. Numerical simulations using TRNSYS software on office buildings demonstrated significant energy savings, particularly at a 30% replacement rate. “The energy savings could be further increased by enhancing the mortar thickness,” Mouzoun notes. This innovation could lead to more energy-efficient buildings, reducing overall energy consumption and contributing to sustainability goals.
The research also introduced a multi-objective optimization approach to identify the best mix composition, balancing mechanical strength and thermal performance. This method could pave the way for future developments in the field, offering a scalable solution for recycling plastic waste into high-performance construction materials.
As the construction industry continues to seek eco-friendly alternatives, this study provides a promising direction for integrating plastic waste into building materials. The findings not only highlight the potential for enhanced energy efficiency but also underscore the importance of innovative recycling strategies in addressing environmental challenges. With further research and development, this approach could revolutionize the way we think about construction materials and waste management.