In a significant stride toward sustainable construction, recent research published in ‘Nordic Concrete Research’ highlights the potential of using recycled aggregates in concrete applications. The study, led by Helsing Elisabeth, a PhD Senior Researcher at the RISE Research Institute of Sweden, delves into the durability factors associated with recycled materials sourced from construction and demolition waste (CDW).
As the construction industry faces increasing pressure to adopt eco-friendly practices, the hesitance to embrace recycled aggregates stems from concerns about their impact on concrete durability. Elisabeth notes, “Even if regulations permit the use of recycled aggregate, many potential users remain cautious due to uncertainties regarding their performance.” This caution is particularly relevant when considering durability metrics like alkali-silica resistance (ASR), frost resistance, and carbonation.
The research reveals that selecting appropriate binders can significantly mitigate the risks associated with alkali-reactive recycled aggregates. Elisabeth emphasizes, “Choosing the right binder can diminish the risk for damage, even when using alkali-reactive materials.” However, the study points out that the alkali content of crushed concrete used as aggregate must be carefully evaluated to ensure optimal performance.
One encouraging finding is that no negative impact on the carbonation of concrete was observed when using recycled aggregates. This suggests that the integration of recycled materials may not compromise this critical durability aspect. However, uncertainties remain regarding the influence of aggregate porosity on frost resistance, as well as the adequacy of existing concrete test methods.
Elisabeth highlights the need for further research, stating, “Before porous recycled aggregates can be confidently used in more demanding exposure classes, we must address the inconsistencies in testing and evaluation.” This call to action could pave the way for broader acceptance and utilization of recycled materials in construction, potentially transforming industry practices.
The implications of this research are profound. As the construction sector increasingly seeks sustainable solutions, the ability to confidently use recycled aggregates could not only reduce waste but also lower material costs. This aligns with global trends toward circular economy principles, where materials are reused and repurposed, ultimately leading to a more sustainable built environment.
For more information on this groundbreaking research, visit the RISE Research Institute of Sweden at RISE Research Institute of Sweden. The findings underscore the importance of continued innovation and research in the quest for sustainable construction practices, marking a pivotal moment for the industry.
